First, promote the application of closed circuit
As we all know, the grinding cost is several times higher than the crushing cost, and as the fineness of the grinding product is increased, the cost is greatly increased. It can be seen that in order to reduce the cost of preparation of mineral raw materials, it is necessary to reduce the grinding cost first. The ball milling cost can be greatly reduced by reducing the particle size of the crushed material to the grinding operation. For each case, a technical economic demonstration of the optimum particle size of the crushed product is required, at which the total cost of crushing and grinding is the lowest. In order to obtain a crushed product of a given particle size, it is most reasonable to use a crusher that is closed with a sieve in the last stage of the crushing.
When the original ore size is -1000 milligrams and the ball mill is used to grind the ore, the design standard is three-stage crushing; and when the ore fed to the plant is undergroundly mined and milled by a ball mill, only medium and fine crushing is designed. When using medium-free grinding, only coarse crushing is considered. The maximum particle size of the final crushed product is 20 (16) mm for a ball mill and -300 (400) mm for a medialess mill. In order to ensure a product with a maximum particle size of no more than 20 mm, a closed-circuit crushing process is used in the last paragraph as usual.
Second, increase the number of shaking of the crusher
Each segment crusher should be operated in accordance with the preferred system of the port of discharge conditions of constant size, this can increase the iron ore crushing plant selected from the plant to 20% and reduce the processing plant energy consumption by 25%.
In order to strengthen the production of the crushing plant and reduce the particle size of the crushed product, the following methods can be adopted: adjusting the crushing ratio of each section of the crushing; using the pre-screening operation; increasing the screening efficiency; increasing the number of shaking of the cone crushing motor cone and the like. Pre-screening is reasonable when more than 30% of the feed is less than the crush size.
Third, improve the design of the broken work area
Efforts must be made to ensure that the cross-section design of the crusher working area ensures maximum use of the space in the area and that the size of the crusher feed port is compatible with the size of the material being crushed. If the appropriate working area section is adopted, and the number of moving cones and the moving head are increased at the same time, the production capacity of the crushing workshop can be increased by more than 35% under the condition that the pre-screening efficiency is high and the size of each crushing and discharging port is ideal.
In addition to reducing the particle size of the crushed ore, one of the directions to improve the production efficiency of the crushing plant is to improve the working time utilization of the crusher and other equipment. The ore crushing process can be strengthened by adjusting the following parameters: the width of the discharge port of each crusher; the size of the sieve mesh; the volume and section shape of the crusher working area; the particle size composition of the crusher feed; the crusher, the screen and The amount of minerals supplied to other equipment.
In order to reduce the particle size of the crushed product and increase the fine-grade content of the product, it is necessary to carry out the crushing under the condition that the width of the discharge port is the smallest, and a high-precision liner is used. Due to the varying degrees of wear on the underside of the liner and the surrounding area, the shape of the fracture zone is damaged, and the fracture index will be greatly deteriorated. In this case, it is reasonable to increase the repair cost because it can improve the working efficiency of the mill and the beneficiation equipment.
When the dry or mud-free ore is broken, it is unreasonable to set the pre-screening operation if the grain size of the ore mine is less than 20% than the width of the crusher discharge port. When crushing muddy ore with a high moisture content, it is preferred to use a pre-screening operation to remove the fractional ore that interferes with the crushing process. It is recommended that when selecting the mesh size, the process parameters of the two operations of screening and crushing should be equal or close to each other. Using a reasonable crusher lining section (according to the maximum block size of the raw material and the particle size composition of the raw material), selecting the optimal venting width and the height of the broken parallel belt can reduce the particle size of the crushed product and improve the crushing process effect. To ensure uniform wear of the lining along the height. The ore is evenly distributed along the periphery of the crushing zone, which also helps to achieve uniform wear of the liner.
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