Five Requirements of Coal Dressing Equipment on Crushing Work

No matter the primary processing of the raw coal or the coal selection, crushing is a crucial link which directly influences the sale of the coals and the investment of the follow-up process and also directly influences the economic profit of the coal companies. With the further development of the market economy and the further improvement of the coal selection machines technology, people have higher requirements on the crushing process.

First of all, people have stricter requirements on the product granularity. Different customers have different granularity requirements and such requirements will constantly change with the market, and if the requirement cannot be satisfied, then the coal will be difficult to be sold out or the customers will refuse to pay due to the overrun granularity which will directly influence the economic benefits of the coal processing companies. At the same time, at different time, the price of the products with different granularity will be different, and the company will have to rely on effective crushing machines in order to maximize their profits.

Secondly, the needs of deep processing and cleansing of the coal. During the washing, selection process of the coal, in order to realize the monomer separation of the gangue and the coal to the largest content, increase the specific surface area of the raw materials, improve the coal quality, remove the harmful materials in the coal such as sulphur and phosphor, reduce the pollution to the atmosphere resulted by the coal in the burning process, the coal company must conduct effective crushing process to the coal.

Thirdly, the requirements of the washing and ore beneficiation equipment. Different washing and selection machines have different disposal granularity ranges, for this reason, the coal must be crushed to satisfy the requirement of the washing and selection machines. For example, heavy medium swirler is a washing and selection machine with high separating efficiency and strong adaptability, and the production process is very easy to realize automation, so that it has wide application. However, if the granularity of the washed and selected products is too big, it will be very easy to block the material feeding and discharging mouth, for this reason, the machine will not be able to work in a highly efficient way. So in order to solve the problem, the raw coal must be crushed to satisfy the feeding granularity.

Fourthly, reduce the over-crushing in the crushing process. In the crushing process, if the materials are over-crushed, it will not only waste the resources, influence the economic benefits of the coal companies, but increase the water content in the coal and increase the pressure of the slurry water system and the actual production rate of the reselection clean coal will be also reduced. With the improvement of the requirement of the environmental protection and the increase of the powder coal processing cost, reducing the powder coal output to the minimum is the key to the crushing process.

Finally, the demand of energy conservation and consumption reduction. At present, in many ore dressing plants, the production cost of the crushing and grinding operation accounts for over 40% of the total ore dressing cost and the investment fee of the crushing and grinding equipment accounts for about 60% of the total investment of the dressing plant. Although the production cost and the infrastructure construction investment of the crushing operation in the coal selection plant has lower proportion than that in the ore dressing plant, the influences of the production cost and the infrastructure construction investment of the raw coal preparation system on the technological and economic index of the coal dressing plants can never be ignored.