Coal, briquette, coking coal, briquette, etc. in the chemical industry
Product Advantages
The structure of the traditional external gear transmission is changed to adopt a double output shaft reducer structure, which effectively improves the accuracy of the roll, and the reducer gears are all hardened gears, which greatly improves the performance and life of the reducer.
Fully adopts high pressure ball The ball groove alignment structure of the machine is more convenient for installation, adjustment and maintenance.
The HPGR (high pressure grinding rolls/rollers) is the core equipment of the grinding process.
High Pressure Grinding Rolls (HPGR) are a type of crushing equipment used in the mining and mineral processing industries. HPGRs use a high-pressure hydraulic system to compress and grind particles between two counter-rotating rolls, which reduces the size of the particles.
The machine reduces particles by compressing and crushing the feed between two counter rotating, parallel rollers with a small gap between them. This forces the rocks against each other and compresses the feed’s density to 80% of its solid volume, exceeding its compressive strength with equal pressure being applied to particles of all sizes.
One of the main advantages of HPGRs compared to traditional crushing methods is that they have a higher energy efficiency and can generate a finer end product. This makes HPGRs an attractive choice for many mineral processing applications, especially for hard and abrasive materials like diamonds, iron ore, and gold.
It first used in the cement industry, while nowadays, also have been used in many other industries like nonferrous metal processing, ferrous metal processing, precious metal processing, etc.
Model
RollerDia.(mm)
Roller Width(mm)
Power(kw)
Feeding Size(mm)
Finished Size(mm)
Throughput(t/h)
Weight(t)
Metal Ore (mm)
Powdered Iron(cm²/g)
Metal Ore (mm)
Powdered Iron(cm²/g)
GM600-200
600
200
2X75
≤25
1100-1300
≤3
1400-1600
16-24
14
GM800-350
800
350
2X132
≤30
1100-1300
≤3
1400-1600
50-65
24
GM1000-300
1000
300
2X160
≤35
1100-1300
≤3
1400-1700
61-91
32
GM1000-400
1000
400
2X200
≤35
1100-1300
≤3
1400-1700
80-120
36
GM1000-500
1000
500
2X280
≤35
1100-1300
≤3
1400-1700
100-150
40
GM1200-500
1200
500
2X315
≤40
1100-1300
≤3
1600-1800
130-190
56
GM1200-630
1200
630
2X400
≤40
1100-1300
≤3
1600-1800
160-240
65
GM1200-800
1200
800
2X500
≤40
1100-1300
≤3
1600-1800
200-310
79
GM1400-800
1400
800
2X560
≤50
1100-1300
≤3
1600-1800
260-390
110
GM1400-1100
1400
1100
2X800
≤50
1100-1300
≤3
1600-1800
360-540
133
GM1700-1100
1700
1100
2X1000
≤60
1100-1300
≤3
1600-1800
530-800
179
GM1700-1400
1700
1400
2X1250
≤60
1100-1300
≤3
1600-1800
670-1000
208
The core theory of high-pressure roller grinding is material layer crushing through high pressure. The working principle is static pressure crushing. The crushing effect is got by pressing materials between the two slowly rotating rollers. The high-pressure roll grinding implements a material layer crushing, which is the mutual crushing between materials with very high crushing efficiency. Generally, the energy consumption of high-pressure roller grinding is greatly reduced compared to impact or shear-type crushing equipment.
How HPGR works
When the HPGR works, the two rollers make relatively slow movements. One of the rollers is fixed while the other is adjustable and is used to adjust the distance between the rollers. It is the way to control the pressure.
Normally, when the material is continuously fed to the two grinding rolls and goes through them, a certain force is given to the movable roller, thus the material is held by the two rotating rollers and moves downward with the rolls. At this time, in a certain area between the grinding rollers, the material particles will form a material layer.
With the uniform and stable high pressure (100-300MPa) from the rolls, the material particles are squeezed, cracked and crushed.
The output product size can be as low as 3mm.
Structure
High pressure roll grinding is normally used as super fine crushing process,which can be as the third or fourth stage of a crushing process, also can be used in the semi-autogenous grinding process for hard rocks.
The input material size for HPGR normally is 25~60 mm,and output size can be less than 3mm. The best input size and output can be chosen accordingly. There are several features compare to the traditional grinding process.
✪ 1. Big size reduction ratio
The output size from a normal crushing system is around 12mm, and the size reduction ratio around 5. But the size reduction ratio of HPGR can be up to 10 or even more. It is able to grind the ore from size 20-60mm to below 3mm.
✪ 2. High crushing efficiency, low energy consumption
Ores output from HPGR are with high ratio of fine particle, and the internal of the ore will have a lot of micro cracks. More fine particle and micro cracks will help to highly reduce the ore grinding cost. Compare to the crushing system which is made of cone crusher, rod mill, ball mill, for an HPGR system is with lower energy consumption for 20 to 50%.
✪ 3. Significantly improve the follow-up process like flotation, leaching, etc.
According to the practice of HPGR in the copper and gold mining industries. The micro cracks in the ores made by HPGR significantly improve the ore grinding efficiency, increases the mineral liberation degree, improves the flotation performance, and increases the recovery ratio of final concentrate ores.
✪ 4. In the leaching process, the micro cracks make the ore a better contact with the leaching liquid, which significantly increases the ore leaching ratio.
According to the research on copper ore leaching, by using the HPGR, the copper increases for 60% and leaching ratio increase for 2% to 6% compared to traditional crushing process.
✪ 5. Greatly improve diamond recovery rate in diamond project.
The traditional grinding machinery like ball mills, semi-autogenous grinding mills or other crushers reduce the particle size by impact, which will destroy the large diamonds. It causes great loss of the diamond value, and also increases energy consumption.
✪ 6. When using HPGR on crushing the diamond ore, the rolls gap can be adjusted (e.g. 25mm) to ensure that the large diamonds won’t be crushed.
Unique material layer grinding technology deeply squeezes the lean ore, which can increase the product recovery rate by more than 20%.