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As we all know, the crushing speed of the crusher is much faster than that of the grinding machine, and the energy consumption of the crushed mine is also 75% to 88% lower than that of the grinding. If the ore can be fully crushed before grinding into the grinding machine, it can greatly improve the grinding efficiency. But so far, many of our beneficiation plants still use after a period of open seats ore crushing into the ball mill. This kind of operation is simple, and the extensive crushing operation is managed, so that the ball mill is too thick for the ore, the grinding time is increased, the grinding machine and the spare parts loss and the electric energy consumption are increased, the grinding technology rate is lowered, and the cost is increased. Especially in the production of gold and silver , gold is extremely fine particles. Many ores are ground to -200 mesh or even -325 mesh. The gold particles are still not effectively separated from the carrier minerals. It is especially important to use "multi-grinding and less grinding". In order to achieve more and more grinding, in addition to the existing mines to rationally change the equipment configuration, each mining machinery factory should develop a new type of efficient, energy-saving, easy to support crushing equipment.
According to statistics, in the energy consumption of many concentrating plants in China, the crushing accounts for 8% to 10%, the grinding accounts for 45% to 55%; the grinding cost accounts for 40% to 60% of the total cost of the plant, of which electricity consumption and iron Ball and lining costs account for 90% of the grinding fee. The energy consumption and cost of grinding are so high, mainly because the ore is too thick in the grinding block, the classification efficiency of the classifier is low, the cycle load of the mill is large, the quality of the iron ball and the lining plate is poor, and the surrounding rock stone is not removed before the crushing. Caused by other factors.
In terms of ore into the grinding block, according to the relevant information, the total energy consumption of the grinding is the lowest when the optimum mass of the ore is 13mm. However, in the actual production of many selected plants, the ore into the grinding block is often 45 ~ 70mm, and some small selection plants in more than 80mm. Although the grinding efficiency is affected by many factors, in the above case, the ore should be first caught in the grinding block. For example, the Erdao Gold Mine strengthens the crushing management. After the ore into the grinding block is less than 35mm from the original 50mm, the daily production capacity of the ball mill is increased by 8.9%, and the cost is reduced by 1 yuan/t. The Baiyun Gold Mine changed the crushing operation, and the ore ingrinding block was changed from the original 50mm to less than 35~30mm, which not only ensured the graded overflow fineness, but the concentrate grade increased by 6.81g when the ore grade decreased by 0.9g∕t. ∕t, the recovery rate of gold increased by 2%.
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