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具有复杂流程选矿厂的作业,可以用数学运算式来表示。这种表示法可以对选矿厂不同部分的分选过程进行定量评价和监控,并得出该厂的整个分选效率。对复杂流程选矿厂矿物精选作业的评价,至今还取决于选矿厂操作人员的主观判断。虽然这种主观判断是以经济合理性为基础的,但还没有办法估量在给定的经济限度内,选厂的效率是否能提高;而如果可能,该怎么做?或者选厂工艺过程是否达到最高的效率?对于简单的分选作业来说,产生一种精矿和一种尾矿,回收率和精矿品位是通常的指标。席尔茨提出
Operations with complex process beneficiation plants can be expressed mathematically. This notation can be used to quantitatively evaluate and monitor the sorting process of different parts of the concentrator and to draw the conclusion of the entire sorting efficiency of the plant. The evaluation of the selection of minerals for complex process concentrators has so far also depended on the subjective judgment of the operator of the concentrator. Although this subjective judgment is based on economic rationality, it has not been possible to measure whether the efficiency of plant selection can be improved within a given economic limit, and what to do if possible, or whether the plant selection process is up to Highest efficiency? For simple sorting operations, a concentrate and a tailings are produced, with recovery and concentrate grades being the usual indicators. Schildz proposed