The representative position of the briquette press in the ball press industry is the earliest and most consolidated, because the use of coal resources in China is inseparable from the briquetting press. At present, the commonly used pulverized coal forming methods mainly include cold press forming of a binder and cold press forming without a binder.

1, with adhesive cold forming

That is, the binder is added to the pulverized coal and then press-formed. In the case where binderless molding such as bituminous coal or anthracite is difficult, the cold press forming method of the binder is generally used in the industry. At present, most of the briquettes used in China’s synthetic ammonia industry also adopt this molding method, because a suitable binder having a mass ratio of 5% to 20% is added to the pulverized coal of these coal types, and the molding pressure is applied by the action of the binder. It can be reduced to 15 to 50 MPa, so it is easy to implement industrially. However, it must be pointed out that due to the use of adhesives, the following problems will occur:

(1) Reducing the fixed carbon content of briquette, especially when using inorganic substances such as lime, cement and clay;

(2) Generally speaking, the price of the binder is higher than that of the pulverized coal. Although the amount used is small, the cost of the briquette is also increased;

(3) The binder itself needs to be treated, and it must be uniformly mixed with the pulverized coal, and later consolidated, etc., so that the molding process is increased and the process is complicated;

(4) The amount of briquette used in industry is large, and the amount of binder needs to be correspondingly large. The binder should have sufficient sources. Based on these circumstances, it is necessary to strengthen the research on the binderless molding method from a long-term perspective. Of course, applications with adhesive molding will continue to evolve.

2, no binder cold forming

That is, the pulverized coal is formed without any binder and by the action of external force. This method has been widely used in many countries to make peat and lignite briquettes as household fuels or industrial fuels. For bituminous coal and anthracite, because of their high degree of coalification, it is difficult to form a pulverized coal without adhesive. At present, the binderless molding process has not been widely used in the industry, but the research work in this area has not been interrupted in the world. The clean coal wet coal rod (wet coal rod) used in China’s synthetic ammonia industry is also an example.

Pulverized coal binderless molding does not require the addition of any binder, which not only saves a large amount of raw materials, but also maintains the carbon content of the briquette, and simplifies the molding process, etc. It is a pulverized coal molding; an important development direction.

Most of the ball sockets of the ball press roll are about three centimeters, and of course they are too big or too small. Today, I would like to remind the majority of users, do not use the roller skin with small ball and socket diameter. If there is a good heart, it is best to dispel it early, because we have encountered similar situations for this, but the results are all Replacement, completely unusable. Why is the diameter of the ball and socket of the ball presser’s roll skin not too small?

The roller presser is the most important decisive component of the size and size of the press ball machine. It is crucial for the whole machine and determines the pressure of the whole machine. It can be said that if the roll skin is not suitable or the quality is not good. The whole machine can’t work. Therefore, the design of the roll skin is quite important. Of course, these manufacturers know it. The problem is that many customers are not clear. Sometimes when the customer orders the machine, the size of the roll ball socket is very small for the manufacturer. It’s very difficult to do, but it can be done, but it can’t be used effectively after it is made. First of all, it can’t reach the pressure. Secondly, it is difficult to support the ball. It needs to explain to the customer one by one.

The size of the ball sleeve of the ball press can not be too small. If it is too small, the pressure of the whole machine will not be reached, and it is also a problem when the ball is placed, and the small ball nest is made. It is also quite troublesome at the time, and the production cost is much higher than normal. Therefore, the size of the roll ball socket cannot be too small; if the roll skin size is too large, it is quite convenient for production. It is also very convenient for the user, but it is also a problem after the event. In the large case, the hardness will definitely decrease, and the strength may not meet the requirements for use. Therefore, the size is not too large.

The ball and socket size of the roller of the ball press is still moderate. If it is too large or too small, it will affect the normal use of the whole machine. Of course, the manufacturer has no problem, so remind the customers that they need to pay attention to this when ordering. Point, otherwise you can not use it according to your requirements, some good manufacturers will give you a reminder, but some manufacturers do not care if you use it afterwards, your request is satisfied But not being able to use afterwards is not their problem. Therefore, for the majority of users, this is a must pay attention.

The shape and size of the ball socket of different types of ball presses will vary from material to material to meet various requirements. For example, for a dry powder ball press, it is necessary to select a flat ball socket, and the ball nest is not large and shallow. The main reason is that the dry powder ball press does not allow any sticking when pressing the raw material. Mixing, if you use deep ball sockets and large ball nests, the ball formation rate is not high. It is even difficult to shape.

For the briquette ball press, the ball socket should be selected as much as possible, and the ball socket should be set to a spherical shape, so as long as the moisture and the amount of the binder are controlled, the yield of the finished ball is as high as 95%. And the strength of the ball is very good. If you can’t do it once, you can try to press the ball twice to ensure the ball rate and strength. Therefore, the design of the roll skin of the ball press equipment should also refer to and follow other aspects.

The rational and effective use of waste is advocated by China, and it also protects the environment. Today, large-scale desulfurization gypsum ball presses play a huge role in the waste of resources, not only to contribute, but also to increase profit margins for customers. .

Large-scale desulfurization gypsum ball press is suitable for various forms of industrial gasification, boiler type, cold-press type focus, ignition type coal, civil type coal, civil metallurgy, refractory materials, medicine and other materials. Desulfurization gypsum ball press has been used and improved for many years. Compared with other similar products, the desulfurization gypsum ball press has obvious advantages such as high pelleting rate, low power consumption, compact structure and easy maintenance. Mainly suppress all kinds of iron powder, desulfurization gypsum, iron oxide scale, steel slag, refractory materials, etc. Any material that needs to be smelted with powder needs a desulfurization gypsum ball press.

First, the three elements that need attention in the production of desulfurization gypsum ball press:

1. Due to the different size and type of coal and ball, the required pressure is also different. It is necessary to select the molding machine whose molding pressure can be adjusted according to the economic situation.

2. The core mechanical equipment of the ball press molding equipment is the forming machine, and the key component that affects the working efficiency of the forming machine is the pressure ball roller. The blank of the pressure ball roll is divided into: integral forging and casting, the casting density is small, and the structure is rough. But it is more economical. Casting has high density, compact structure, good wear resistance, long service life, good processing technology of ball groove, suitable material types, and reliable operation. Most of them are used in medium and high pressure large-scale molding machines, but the cost is high. After the manufacturing process is improved, the current equipment replacement and maintenance is more convenient, reducing the difficulty of user maintenance.

3. The ball produced must be dried before it can be sold or used. The current use is preferably high efficiency, good use of vertical dryer or flap drying equipment. The special design structure of large-scale desulfurization gypsum ball press has compact structure, convenient maintenance, simple operation, short process flow, low energy consumption and low failure rate. The main roller part adopts high-quality alloy steel material to greatly improve the wear resistance and pressure resistance. The desulfurization gypsum ball press machine has a long service life. It also better reduces the energy of the equipment and has a good effect on the protection of the environment. It is suitable for the pressing of various materials. It is characterized by large production capacity and wide application range. The larger the production capacity of the desulfurization gypsum ball press, the smaller the energy consumption, which saves the production cost for the user and greatly improves the economic benefit. Its products solve the problem that users are difficult to suppress high-humidity materials, save resources and reduce the cost of customers.

Second, in addition, in the production of ball press equipment, factors affecting safe production include environmental factors and human factors. Where is it embodied? The following is a detailed introduction.

1. Environmental factors
There are many environmental factors that affect production safety in the operation of the ball press equipment production line, such as engineering geology, meteorological conditions, noise, ventilation, lighting, etc., and these factors have complex and varied characteristics, especially meteorological conditions such as When temperature, humidity changes, or winds, heavy rain, hot weather, severe cold, etc., the operation and working efficiency of the production line will be directly affected. In severe cases, the production line will be shut down and the equipment will be damaged.
Environmental factors can be said to be objective factors affecting the safety level of the pressure ball machine production line. The objective factors are mostly unchangeable. They can only adapt to the defense measures to reduce the impact and harm.

2, human factors
People are the creators of security, and their colleagues are also powerful destroyers. The operators directly control the operation of the equipment. If careless and careless about the management and use of equipment according to the equipment use rules, equipment damage and safety will be greatly increased. The probability of accidents will cause the production line of the ball press to stop or cause casualties, so people are the most important factors affecting the safety of the production of the ball press equipment.

However, it is considered that the factors are subjective and controllable. Therefore, to ensure the safe operation of high-pressure ball presses, ore powder ball presses and other production lines, it is necessary to take the core and use people as the driving force for safety control, and to exert human enthusiasm and creativity. Say you can start from a few points:

1. Intensify safety production publicity and education and special rectification activities for safety production, and further verify the safe production base of the ball press production line through inspection activities.

2. Analyze various factors affecting quality and safety in advance, find out the leading factors, take measures to focus on control, eliminate the quality problem in the bud, and prevent it from happening.

3, the operator should have superb technology and meticulous work style, should strictly implement the quality standards and operating procedures, with excellent work quality to ensure the safety of the production line.

4. The system of customizing, definite, and post-responsible should be implemented in accordance with the principle of man-machine fixation. Strictly analyze the quality of materials used in ball-pressing equipment, and identify problems in time to ensure quality and safety.

As a company, safety production is one of the top priorities. Because safe production not only ensures the personal safety of workers, but also ensures the normal operation of the machine. Safety production includes inspections before the machine is running, precautions during work, and maintenance knowledge. Let me take a look at the routine check before the ball press is turned on:

First, adjust the tightness of the pressure belt of the ball press, the tightness requirements; press the V-belt with the force, the droop is not more than 1 cm.

Second, adjust the gap between the two rollers of the ball press to ensure that it is the best between 0.5-1 mm. The main method is to press down or lift the iron.

Third, let the pressure ball machine empty test run, no abnormal phenomenon began to start the test load.

Fourth, inspection of the ball machine ball out of the situation, there can be no sticky roller does not release the phenomenon. If it is necessary to polish the forming rolls, the method is to repeatedly test the pressure on the machine with dry loose coal until all the mold is released.

Improve motor performance

First, the stator winding is changed into a star-delta hybrid series winding, and the star-connected or delta-connected method according to the load is lightly and heavyly converted, which is beneficial to improve the magnetomotive force waveform generated by the winding and reduce the working current of the winding, thereby achieving the purpose of high efficiency and energy saving.

Second, the reasonable adjustment of the type of coal briquetting machine motor can make the motor run in a high-efficiency working area and achieve energy-saving purposes.

Third, the cross-section from the joint to the electric energy meter and the wire leading to the motor should meet the current carrying capacity, and the wire should be shortened as much as possible to reduce the wire resistance and reduce the loss. The above measures can be adopted separately or multiple times at the same time. In short, it takes some necessary technical energy-saving measures for the briquette briquetting machine motor, which is beneficial to the safe and stable operation of the power grid, and also enables users to reduce electricity bills.

Fourth, improve the efficiency of the coal briquetting machine motor itself, such as changing the motor self-cooling fan to its cooling fan, can disable the cooling fan when the load is small or the outdoor motor is in winter, which is beneficial to reduce energy consumption.

Fifth, the newly purchased briquette briquetting machine should first consider the selection of high-efficiency energy-saving motors, and then consider other performance indicators as needed to save energy.

Sixth, the use of other continuous speed control mode. Such as the use of voltage regulator, pole-changing motor, electromagnetic coupling governor, frequency control device.

Seventh, reasonable installation of parallel low-voltage capacitors for reactive power compensation, effectively improve the power factor, reduce reactive power loss, and save energy.

Four transmission modes

1. The briquetting machine motor drives the hard tooth surface reducer. The low speed output of the reducer is parallel to the two axes. The gear roller drives the ball roller to operate relatively. The feeding method adopts the screw propulsion and exhaust device, which is suitable for dry powder molding. This type of transmission, the roller block rotates smoothly, the gear life is long, the transmission torque is large, and the roller surface line pressure is up to 100KN or more. It is generally applied to the dry powder forming pellet production line of metallurgical and refractory enterprises. Due to the insufficient development of this type of machine in China, there are still few single machines with large output so far.

2. The motor drives the reducer, and the low-speed output shaft of the reducer is a single shaft. The coupling moves the pair of large gears on the pressure roller to move relative to each other, that is, the suspension gear. This type of transmission is commonly used by most manufacturers of briquetting machines. Due to its simple structure and low price, it is widely used in China.

3. Improved type; that is, changing the hanging gear to the gear box increases the transmission torque and increases the production volume. The price is much lower than that of the dual output shaft, which has been gradually promoted in China.

4, open transmission mode, that is, the motor directly drives several gears of open gear transmission, limited to small test or very low production use, has been gradually phased out in the domestic market.

Over the years, our briquetting machine manufacturers have established their own positions, facing the society, in the fierce market competition, comprehensively strengthen quality management, improve functions, and the products have won the provincial honorary title many times. The global sales network has enabled all kinds of equipment produced by our company to be spread all over the world. The sales network has established a good business relationship with customers and can solve problems for you at any time.

Iron and steel enterprises aim at full utilization of solid waste and zero emissions, and most of them have made great progress. The combination of specialized centralized management and various management systems has also achieved initial results. At present, all steel companies have basically completed the full treatment and recycling of iron-containing resources in industrial solid waste. The basic sequence is: solid waste resource recovery → sintering → blast furnace → steelmaking → steel rolling, the so-called “large recycling model”. However, its utilization is still in the low-level, low-efficiency, low-value-added, low-level utilization, which is characterized by non-optimal economic and environmental benefits, such as the use of iron oxide scale, converter mud and gas mud, so it is developed in depth and The research on high-value utilization needs further research and development. This paper will explain the deep development of metallurgical waste from six aspects.

1. Strengthening the slag grade and quality of steel slag flux slag

The flux slag recovered after crushing magnetic separation of steel slag has been used by the sinter plant, and the ratio is generally about 115%. However, the blending of flux slag will affect the grade and quality of sinter, mainly because the water wetting property and pelleting performance of the steel slag are worse than that of iron ore powder. The amount of sinter plant is limited or even stopped, so that the flux slag utilization and export pressure Increase. Therefore, the experimental research on strengthening granulation of sinter and steel slag flux slag should be strengthened, and the suitable amount of steel slag flux slag should be discussed to ensure that the sintering speed, sinter strength, yield, utilization coefficient and sinter reductivity meet the requirements.

2. Further development of steel slag in cement production

Steel slag should be further strengthened for production test research and production verification of cement plants, and the optimal process control parameters for steel slag cement production should be explored to increase the amount of steel slag incorporation.

3. Development of steel slag powder production

The use of steel slag powder in cement and concrete is the best way to utilize high-value resources of steel slag in China. The steel slag with specific surface area of ​​400m2 /kg can replace 10%~30% of cement in equal amount, and can be directly used in concrete construction engineering, which can improve the late strength of concrete, improve wear resistance, frost resistance, corrosion resistance and cost. It is 30% lower than cement and can reduce the construction cost. It is the raw material for high performance and high durability concrete. At present, the annual output of steel slag powder has reached 3 million tons, and the products are mainly used for engineering construction. In the development of steel slag powder production, it is necessary to strengthen the selection of grinding equipment and the control of the grinding process.

4, steel slag for road materials and building materials

The key is to solve the problem of the stability of steel slag. It is necessary to improve the existing hot slag treatment process, and strengthen the technical research of steel slag hot slag treatment process and equipment. The research and development of the steel slag hot slag treatment and the hydraulic steel slag non-burning load-bearing bricks in Hunan’s Handan Iron and Steel Co., Ltd. achieved good results. Agrwal G and others at Alfred University in the United States use steel slag to produce CaO-rich glass-ceramics that are more resistant to corrosion and corrosion than ordinary glass.

5. Accelerate the development and utilization of gas mud

After the gas is re-elected, the carbon content in the tail mud is as high as 35%, and the carbon in the gas is recycled to replace the anthracite used in the blast furnace. Carbon powder can be recycled using a new recycling process.

6. Develop metallurgical dust sludge to produce coolant and slagging agent for steelmaking

The comprehensive utilization of converter mud, dust ash, iron oxide scale, etc. has always adopted the “recycling-processing-sintering utilization” process route, and is not a deep-developing and high-value utilization method of solid waste resources. The use of metallurgical dust sludge such as converter mud to produce coolants and slag-forming agents that meet the requirements of steelmaking, so that the utilization process of metallurgical dust sludge can be reused from the past “waste-burn-iron-steel” large-scale recycling to “waste-steel” small cycle. The use of transformations makes the system less energy-intensive, less polluting, less costly, and more profitable.

7. Pressing metallurgical waste into a stamping process

Generally, the high-pressure briquetting machine can extrude metal materials such as metal scraps, steel shavings, scrap steel, scrap iron, scrap copper, aluminum scrap, aluminum shavings, disassembled car shells, and waste oil drums into various shapes such as cubes and cylinders. Qualified charge. Easy to store, transport and recycle.

The metallurgical sludge of the steel plant mainly includes: blast furnace gas mud, converter dust and dust and ash.

During the steel making process, about 2% of the raw materials added to the converter will be converted into dust, and the amount of converter dust generated is about 20 kg/ton. Steelmaking dust is mainly composed of iron oxide, accounting for 70% to 95%, and other oxide impurities (such as CaO, ZnO, etc.) account for 5% to 30%. Converter steelmaking dust is generally used as a raw material for sintering, but zinc is a harmful element in the iron making process. Because it is easy to form a furnace in the process of blast furnace smelting, it affects the flow of charge and gas, so the converter dust is in the recycling process. In the middle, the fine ore and the C and Zn-rich tail mud can be recovered by the beneficiation method. Adding OG mud suspension to the sintering mixture is beneficial to the granulation of the mixture. With the increase of the OG mud dosage, the 1mm particle size ratio of the mixture is rapidly reduced, which is beneficial to improve the gas permeability of the mixture, increase the yield, reduce the cost and protect the mixture. surroundings.

The composition of the blast furnace gas mud is mainly about 20% of iron oxide, 23% of carbon, 1% to 5% of zinc, and more oxides such as CaO, SiO2 and Al2O3. The amount of blast furnace dust generated is about 25 kg/t. The blast furnace gas mud particles are finer, and less than 200 mesh accounts for more than 90%. The blast furnace gas mud is characterized by high content of zinc, iron, carbon, moisture, fine particles, and zinc is mainly present in smaller particles. The blast furnace gas and gas ash can be extracted by using hydraulic separation and beneficiation method to extract Zn-rich and C-rich tail mud as resources.

At present, the recycling rate of metallurgical dust in large enterprises in China can reach 100%. The process and technology of converter mud, dust removal ash and gas mud are at a relatively advanced level, which can bring good economic benefits to enterprises.

The process of comprehensive utilization of metallurgical sludge is as follows:

(1) Dry process of converter mud and dust removal ash
Converter mud, dust removal ash → sintering return mine → mixed material processing plant.

(2) Converter mud wet process
Converter mud → mixing tank → pipeline → sintering batching belt → converter mud drying + iron oxide scale + chemical binder → stirring and mixing → pressurizing into balls → drying in the furnace → pellets.

(3) Gas mud utilization process

Gas mud → re-election → iron fine powder → sintering plant → zinc-containing mud → fire method to extract zinc.

Steelmaking sludge is a by-product of dust removal from oxygen top-blown converters, and this resource is very precious. The chemical composition fluctuates greatly, the iron content is high, the basic oxide content is high, and the particle size is fine. The sludge can be used as a raw material for sintering and pelletizing, and can exchange part of the iron-containing raw material, and combines a small amount of binder and solvent. Reduce costs and reduce the role of steel plant sewage.

Sludge is a good iron raw material, the following methods of use:

1. As the ingredients directly return to the sintering and utilization, it has a great impact on the environment, easy to form a group alone, mixing is not easy, affecting the effectiveness of comprehensive utilization.
2. Pipeline transportation to the sinter plant for shotcrete utilization, the steelmaking sludge can be concentrated to a certain solid concentration at a short distance, and the pipeline is sent to the sintering as a substitute for the sintering make-up water.
3. The steel slag powder pellets are mixed and then extruded into a sludge pellet by a molding agent to be used as a steelmaking slag coolant, and a good effect is obtained. The state attaches great importance to environmental protection, and attaches importance to the treatment of converter sludge generated by steel enterprises. The growth of energy shortage price affects the development of the steel industry, and it is inevitable to find new ways and means.

Among the metallurgical slags, there are mainly blast furnace water quenching slag, steel slag, blast furnace heavy slag, etc., in which blast furnace water quenching slag and blast furnace heavy slag utilization rate is higher, while steel slag utilization rate is lower, only about 20%. The long-term stacking of unused metallurgical slag is not comprehensively utilized in time. On the one hand, the metallurgical slag will gradually lose its activity and it will be difficult to reuse. On the other hand, the metallurgical slag will occupy a large amount of land and will seriously pollute the environment. How to make heavy use of metallurgical slag has become a top priority for all steel companies.

1.1 Development direction of metallurgical slag resource treatment and comprehensive utilization

The metallurgical slag resource treatment and comprehensive utilization refers to magnetic separation and removal of iron from metallurgical slag and the use of tailings for the production of building materials. The waste steel recovered from the metallurgical slag can be returned to the steel plant for smelting and reuse; the magnetically recovered tailings can be used to produce cement mixed materials, road substrates, masonry cement, ready-mixed mortar, concrete bricks, perforated bricks, Metallurgical slag autoclaved aerated blocks and other building materials.

1.2 Metallurgical slag resource treatment and comprehensive utilization and energy saving and environmental protection

The method of producing energy-saving and environmentally-friendly building materials by using metallurgical slag is to use the renewable resources such as metallurgical slag, blast furnace gas and waste heat steam generated by the steel plant to produce a new process of energy-saving, environmentally-friendly and replaceable high-energy building materials. The steel slag after crushing magnetic separation and iron has more minerals such as free CaO, and these minerals are hydraulic. When steel slag is used together with blast furnace water-quenched slag, Ca(OH)2 precipitated by steel slag can promote alkaline slag, and slag can eliminate the adverse effect of free CaO in steel slag and improve product volume stability. . The heavy slag after crushing magnetic separation and iron removal has the characteristics of good density and good volume stability, and can replace gravel and yellow sand as the coarse and fine aggregate of building materials. In this paper, steel slag mixed materials, steel slag slag concrete bricks and metallurgical slag autoclaved aerated blocks are taken as examples to analyze the relationship between metallurgical slag comprehensive utilization and energy saving and environmental protection.

(1) Energy-saving and environmental protection analysis of steel slag mixed materials

Steel slag has been used in the cement industry for more than 30 years in China. According to incomplete statistics, domestically, 10 million tons of steel slag can be used annually. The steel slag mixture used for the production of cement must be dried. At present, the common drying method is to transport the steel slag mixture containing about 12% of water to the cement plant by car, and then use the combustion of coal to generate hot air for drying. This process increases the amount of car transport by 10% on the one hand and coal resources on the other. Nowadays, the economic way of using steel slag as cement admixture is to use the blast furnace gas, a by-product produced by the ironworks, to dry on the spot, which can greatly save the transportation volume of automobiles and oil, coal and other resources. Using the blast furnace gas produced by the ironworks, the blast furnace gas is dried on site. The first moisture per ton of steel slag is dried to 2% of the final moisture, and 150 cubic meters of blast furnace gas is required (the calorific value is 3500 kcal/m3). Each year, 10 million tons of steel slag mixed materials need 1.5 billion cubic meters of blast furnace gas, equivalent to 750,000 tons of standard coal (the calorific value of standard coal is about 7000 kcal / kg); 10 million tons of steel slag mixed materials per year (the distance is 30 kilometers) It can save 450,000 liters of oil for transportation of automobiles (the heavy-duty trucks consume 1.5 liters/100 kilometers per ton of steel slag oil) and the coal consumption is 750,000 tons.

(2) Energy-saving and environmental protection analysis of steel slag slag concrete brick

Steel slag slag concrete brick is mainly made of steel slag slag masonry cement as cementing material, steel slag, water quenching slag and blast furnace heavy slag as aggregate, and then a certain amount of additives are added, semi-dry pressing and forming, steel mill A metallurgical slag brick produced by the method of residual heat steam curing. The production process was implemented in the building materials production line of Xinyu Iron and Steel Co., Ltd. in 2006. It has been proved by theory and practice that the performance indexes of the steel slag slag concrete brick produced by the process are better than the national standard requirements, and the product cost is low. More than 90% of the production raw materials are metallurgical slag discarded by the steel plant, and the steel plant waste heat steam is used for maintenance. In line with national industrial policies for energy conservation and environmental protection. Taking Xinyu Iron and Steel Co., Ltd. as an example of a steel slag slag concrete brick production line with an annual output of 300,000 cubic meters, it can consume about 110,000 tons of steel slag, 110,000 tons of slag and 220,000 tons of heavy slag per year. It can use a large amount of metallurgical slag for steel mills. And produce good economic benefits.

The cementitious material used in the production of steel slag slag concrete bricks is made of metallurgical slag self-contained M22.5 masonry cement, eliminating the need for high-energy PS32.5 or more finished cement. The aggregate of steel slag slag concrete bricks uses the metallurgical slag of the steel plant on site, which can reduce the mining excavation volume and vehicle transportation volume of 360,000 tons of sandstone every year. The maintenance of steel slag slag concrete bricks is maintained by steel mill waste heat steam, which saves coal resources. The production line integrates the comprehensive utilization of metallurgical slag, waste heat steam, blast furnace gas and other renewable resources. It can save sand and stone transportation (with a distance of 30 kilometers) and use 162,000 liters of oil per year (heavy load trucks consume 1.5 per ton of steel slag oil). l / 100 km); can save 90,000 tons of finished cement per year, equivalent to about 10,000 tons of standard coal (110 kg / ton of finished cement); at the same time reduce the production and use of 200 million clay bricks per year, equivalent The standard coal is 30,000 tons (the clay brick coal consumption is 100 kg/m3). If 100 large-scale steel plants nationwide build an annual production line of 300,000 cubic meters of steel slag slag concrete bricks, the annual utilization of metallurgical slag will be about 44 million tons, saving 16.2 million liters of oil for transportation and 4 million tons of coal. In this way, the metallurgical slag discarded by the steel plant is used in large quantities, and the market of clay bricks is replaced a lot, and the cultivated land is protected. At the same time, since the steel slag slag concrete is a burn-free brick, energy saving can be achieved.

(3)Energy-saving and environmental protection analysis of metallurgical slag autoclaved aerated block production

The metallurgical slag autoclaved aerated block is made by adding steel slag and slag to the slurry, adding powdery composite additive, appropriate amount of gypsum and gas generating agent, and adding by gas, pre-culture, cutting, autoclaving and other processes. Gas block products. The metallurgical slag produced by the process has good performance in steam-pressing and aerating blocks, meets the needs of industrial and civil construction, and can consume metallurgical slag in large quantities. More than 90% of the raw materials used in the process are metallurgical slag. The steam is produced by using the blast furnace gas, a by-product of the ironworks, and the product cost is low. The production line consumes about 75 million cubic meters of blast furnace gas per year (heat value is 3200 kcal / cubic meter), equivalent to about 34,000 tons of standard coal (the calorific value of standard coal is 7000 kcal / kg). Taking Xiangtan Iron and Steel Group Co., Ltd. as an example of an annual production of 300,000 cubic meters of metallurgical slag autoclaved aerated block production line, it can consume about 140,000 tons of steel slag and 140,000 tons of slag per year. It can use a large amount of metallurgical slag and produce a good economy. benefit. If 100 large-scale steel mills in the country build an average of 300,000 cubic meters of metallurgical slag autoclaved aerated block production line, they can use about 30 million tons of metallurgical slag, saving 3.4 million tons of coal per year.

In the process of producing refractory balls, a hydroforming method is usually used. The following is an introduction to the press forming method and some suggestions for equipment selection.

1. The press forming method is the most used forming method in the production of refractory balls. The method uses a ball press and a steel die to compress the formulated refractory ball material into a sphere. Since general machine forming refers to a semi-dry material forming method having a water content of 4% to 9%, it is also called semi-dry molding. The equipment commonly used in this method includes a friction brick press, a lever press, and a hydraulic press.

2. The press forming process is essentially a process in which the particles in the ball are densely packed and the air is discharged to form a dense sphere. The machine-formed refractory ball has the advantages of high density, high strength, small shrinkage and shrinkage, and easy control of the size of the refractory ball. Therefore, this method plays a major role in the production of refractory balls.

3. In order to obtain a dense sphere during press forming, sufficient pressure must be given to the pellet. The pressure should be such that it can overcome the internal friction between the pellets, overcome the external friction between the pellet and the mold wall, and overcome the pressure distribution caused by the moisture of the pellet, the particles and the uneven filling in the mold. Uniformity.

The proportional relationship between the three depends on the dispersion of the pellets, the composition of the pellets, the moisture of the pellets, the size and shape of the spheres, and the like. Although there are several theoretical formulas for calculating the relationship between pressure and sphere densification, such as the change of the spherical pores with the logarithm of the pressure, the test method is usually used to determine the pressure per unit area of ​​the sphere, and the pressure is determined accordingly. The total pressure that the brick machine should have.

The requirements of the ball forming machine for the ball material should have a certain fluctuation range except for the moisture, and there are certain requirements for the particle size. For example, there should be a reasonable particle size ratio, and the bulk density should be as large as possible. Generally, the critical particle size is 3 to 5 mm, and the fine powder content of less than 0. 088 mm should be in the range of 35% to 45%.

The most common defects of machine-formed refractory balls are spallation and layer density. A spallation is a lamellar crack formed perpendicular to the direction of pressurization formed during pressurization. Excessive moisture in the ball, excessive fines, too little binder and excessive pressure can lead to spalling.

Therefore, these parameters must be controlled in production. The layer density phenomenon, that is, the density of the refractory balls after molding, is reversed in the direction of pressurization. The unidirectionally pressurized refractory ball from the top is generally dense and sparse, and the same horizontal plane is medium-density and sparse. This is due to the friction between the ball particles and the friction between the ball and the die wall. The method of reducing the external friction by double-sided pressing and lubricating the four walls of the mold can reduce the phenomenon and reduce the porosity of the sphere.

The selection of molding equipment should be considered comprehensively according to the quality requirements, size and production quantity of the refractory ball. Generally, the refractory ball for the heating furnace or the product with simple shape, large quantity and general quality requirements can be selected with the lever ball press with high production efficiency; the refractory ball with higher quality requirement can adopt the friction with the nominal pressure not lower than 2000K•N. Pressure ball machine.

The briquetting machine sleeve is an indispensable component in the briquetting machine. The briquetting sleeve determines the shape of the pressing machine. It is a layer of surface excavation included on the outside of the core of the briquetting machine. A cylindrical member having a ball socket. According to the different assembly methods, it is divided into one-piece and sub-package. With the development of briquette technology, the durability and molding rate of molding equipment have been widely concerned. The mainstream ball presses are generally cast with 9 chrome 2 molybdenum roll material, which has the strongest wear resistance and will greatly improve the use of briquetting equipment. life.

Since some of the press ball presses are relatively hard, generally 65Mn castings, 9 chrome 2 molybdenum or alloy can also be used. The specific situation should be selected according to the actual situation of the material. With the development of briquette technology, the durability and molding rate of molding equipment have been widely concerned. The mainstream ball press is generally made of 9 chrome 2 molybdenum roll material casting, which has the strongest wear resistance and will greatly improve the use of pressure ball machine equipment. life.

 

Briquetting machine roll set

 

First, the briquetting machine has no key assembly form:

1. Tightly fit with the hot-packing method, that is, the roller sleeve with the ball socket is heated and then mounted on the hub. This assembly form has high processing precision, strict processing temperature control, and must have special equipment when replacing, generally used for high-pressure ball press , for example: strong mineral powder ball press, powerful ball press, high pressure dry powder ball press

2, the cone set method, that is, the roller sleeve or the hub design has a taper, and the middle taper sleeve is tight. This form is beneficial to the disassembly and assembly of the roller sleeve, and is applied to a medium and low pressure ball press, such as a desulfurization gypsum ball press. Static pressure ball machine, etc.

3. Bolt fastening method, that is, the sleeve and the hub are designed with bolt holes, which are tightened with refined high-strength bolts. This method is beneficial to the on-site disassembly and assembly of the roller sleeve, and the wet medium and low pressure ball presses are more used.

Second, the briquetting machine key joint assembly method: that is, the shaft and the roller sleeve have key grooves, and the shaft and the sleeve are coupled by the key. Since the key groove and the thread are opened on the shaft, the diameter of the main shaft is slightly larger than the shaft diameter of the keyless assembly form. .

Third, the briquetting machine roller disassembly assembly form: that is, the roller sleeve is divided into several equal parts, and is fastened by the positioning pin and the bolt on the hub. In the manufacturing process of the roller tile, the heat treatment is adopted, and the roller tile is easily deformed, and cannot be smoothly replaced in the future, the heat treatment is omitted, and the roller tile is not durable. Due to the assembly method, the roller is small in size and light in weight, which is very advantageous for on-site replacement. Therefore, the ball press is very popular, but the durability of the ball press roller needs to be improved as soon as possible.

The field application of the roller mill is divided into three parts, and at the same time, as a precaution in the use of the high-pressure roller mill, I hope to help you.

First, feeding

(1) The high-pressure roller mill must be densely fed during use. If the feed is loose, the uneven force on the roll surface will reduce the life of the roll surface.
(2) The high-pressure roller mill must have proper powder in the feed, not only the material on the screen, otherwise the life of the roll surface will be greatly reduced.
(3) The high-pressure roller mill should be evenly fed, otherwise it will cause the squeeze roller to deflect and reduce the extrusion effect. In severe cases, the host will jump.

Second, iron treatment

If there is metal in the feed of the high-pressure roller mill, the life of the roll surface will be reduced. If the metal near or larger than the roll gap size is fed into the high-pressure roll mill, the partial roll surface load will be too large, resulting in damage to the stud or roll surface. If there is metal in the feed to the high pressure roller mill, the following measures can be taken to protect the roll surface.
(1) Install metal detectors and iron removers on the feed belt of the high pressure roller mill.
(2) If it is closed-circuit screening, the iron remover can be installed above the discharge end of the material on the sieve. At this time, the material on the sieve is in a loose state, which can effectively remove the magnetic metal minerals therein.
(3) In the self-grinding/semi-self-grinding machine process, if the cone crusher and the high-pressure roller mill are combined as a hard stone crushing device, a curved iron remover can be installed at the discharge end of the mill (only for non-magnetic and weak magnetic properties) Mineral), de-ironing the self-grinding/semi-self-grinding machine, and installing metal detectors and iron removers on the subsequent return belt to ensure that all metal materials in the return material are removed.
(4) In the iron removal system, the iron remover should be used in combination with the metal detector, because the iron remover can only remove the magnetic metal in the feedstock, and for the non-magnetic metal, it should be manually removed by the metal detector.

Third, the bypass system

At present, many conditional mines have set up a bypass system in the high-pressure roller mill system, which can not delay production when the high-pressure roller mill fails, periodically repairs and replaces the roller surface. The bypass system is suitable for three-stage closed-circuit crushing + high-pressure roller mill ultra-fine crushing process, in high-pressure roller mill parking or under certain special conditions (such as continuous rain, excessive air humidity, high-pressure roller mill running poorly), materials It can be directly fed into the subsequent ball mill to make the production continuous.