Generally speaking, grinding is to get fine particles or super-fine products. Other than cylinder ore grinding mill which can also be called media mill, the grinding force of some machines can be directly put on the crushed materials to get products with fine granularity, so this also belongs to the grinding field, such as Raymond mill, colloid mill and air-flow mill. The ore grinding process directly influences the technical indexes of the ore beneficiation plant, for example, the weak single separation degree of useful minerals will reduce the grade of concentrate and the recovery rate; or over crushing or over grinding will not only increase the consumption of electricity and steel, but aggravate the beneficiation process and reduce the beneficiation index.
The consumption of power and metal in the ore grinding process is huge, and the usual electricity consumption is about 2×107~8×107J/t, accounting for 30%~75% of the total electricity consumption of the ore dressing plant, and even for 85% in some plants. The consumption of grinding media and lining boards is sometimes as high as 0.4~3.0kg/t. In addition, the infrastructure investment and maintenance costs of the grinding process are also very high.
According to the fineness differences of the final products, the ore grinding process can be divided into: (1) coarse grinding: the granularity of the final products is 0.15~3.0mm; (2) fine grinding: the granularity of the final products is 0.02~0.15mm; (3) superfine grinding: the granularity of the final products is small than 10um and even 0.05~1um.
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