Physical and chemical indicators of cold pressed particles
The physical indexes of cold-pressed particles mainly refer to wet bulb drop strength, green ball compressive strength, green ball drop strength, heat strength, void ratio, etc., while chemical indexes mainly refer to various reaction properties into the furnace, such as reducing traits. , high temperature softening and melting characteristics.
1. Wet ball drop strength
The wet bulbs that have been cold-formed by the ball press are screened and transported once to the drying kiln, so a certain drop strength is required to ensure that they do not break and are less deformed during transport.
2. Raw ball drop strength
The green ball dried by the drying kiln has to be transported multiple times and finally dropped into the furnace, so sufficient drop strength is required to ensure that it is not broken and rarely deformed during transport overshoot.
3. Green ball compressive strength
The raw ball must have a certain compressive strength to withstand the various stresses of the raw ball during the drying process, such as the upper layer pressure of the fabric, the stacking pressure of the finished silo, and the like.
4. Thermal strength
The raw ball should ensure a certain thermal strength during the sintering process to avoid pulverization.
It refers to the percentage of pore volume in the volume of the ball to the total volume of the ball. The size and distribution of the pores are closely related to the strength of the pellet. As the porosity decreases and the grain radius decreases, the pellet strength gradually increases.
6. Reduction traits
The pellet reduction property refers to the volume expansion of the pellet when it is reduced in the furnace and the strength after the pellet is reduced. Generally, the reduction degree of the pellets in the furnace is required to be 60%, and the residual cold compression strength after reduction is not less than 25 kg/cm2.
7. High temperature softening and melting characteristics
The pellets are reduced during the smelting process and gradually melt as the temperature increases. In order to avoid the expansion of the viscous melting zone, it is required that the pellet softening interval should not be too wide and the melting point should not be too low.
ZY mining briquetting machine can press a variety of materials. Since each manufacturer’s materials vary according to the products they produce, it is important to ensure that your materials are within our material range. At the same time, we will show you the type of material that our briquetting press can suppress so you can choose.
There are many options for the shape of the ball press. Such as round, oval, drip, polygonal and so on. Because different manufacturers and regions have very different requirements for ball sockets, we can design according to different materials.