Is it good to crush chrome mine with vertical mill or ball mill?
In the metallurgical industry, chromite is mainly used to produce ferrochromium and metallic chromium. Chrome ore ferrochromium alloys are used as steel additives to produce a variety of special steels with high strength, corrosion resistance, wear resistance, high temperature resistance and oxidation resistance, such as stainless steel, acid-resistant steel, heat-resistant steel, ball bearing steel, spring steel, tool steel, etc.
Chromium ore belongs to ore with high hardness and high processing difficulty. In terms of crushing, jaw crusher + single-cylinder hydraulic cone crusher + multi-cylinder hydraulic cone crusher are generally used for processing; in the grinding process after crushing, it is generally used Relatively speaking, ball mills are more suitable for the grinding and processing of metal ores, while vertical mills are more used in large-scale non-metallic ores pulverizing, coal powder processing and other projects.
The difference between vertical mill and ball mill:
1. The energy consumption utilization rate of ball mills is low, and there is a tendency to be replaced by vertical mills, roller mills and other equipment. However, ball mills have the special advantage of "the particle shape is approximately spherical, which is conducive to the calcination of raw meal and the hydration and hardening of cement". , which is the main reason why clinker mills still mostly use ball mills.
2. The vertical grinding method is reasonable, the classification is timely, and the phenomenon of over-grinding of materials is avoided, so the grinding efficiency is high, the power consumption is low, and the power consumption is more than 20% compared with the ball mill.
3. The air volume allowed by the vertical mill is large, so the drying capacity is large, and the material in the mill is in a suspended state, which increases the contact area between the material and the air flow, and the heat exchange conditions are good, so the drying efficiency is high. When a ball mill grinds wet raw materials, additional drying equipment is usually installed in front of the ball mill due to the limited airflow through the ball mill.
4. The space occupied by the vertical mill is only 50%~70% of that of the ball mill, and the space occupied is relatively smaller.
5. The product fineness of the vertical mill is easy to adjust, the particle gradation is uniform, and the chemical composition is stable. The product produced by the ball mill has a relatively low proportion of fine powder in particle size.
6. There is no impact between the grinding bodies and between the grinding bodies and the lining plate during the operation of the vertical mill, so the noise is low. The grinding and piping system of the vertical mill are relatively simple, the sealing is better, and most of them are operated under negative pressure. Less dust.
7. The vertical mill wear is low. There is no direct metal-to-metal contact during operation, so metal consumption is low. Therefore, the accessories wear less and have a long service life. The metal wear per unit product is generally 5~10 grams per ton. The ball mill uses the collision friction method, so the wear is high.
However, vertical mills are not suitable for grinding hard and abrasive materials, with short service life and frequent maintenance. And its wear parts are more expensive than ball mills, but compared with the total maintenance of the ball mills, elevators, powder separators and other equipment it replaces, it is still simple, easy and less work.
The above are the main differences between vertical mills and ball mills. Each has its advantages and disadvantages. When choosing the corresponding mechanical equipment, customers need to choose according to the specific materials and output.