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在鑛物原料工業中,有着粗粒嵌佈結構的,組成鑛物比重幾乎是相同的鑛石。選别这樣的鑛石,無論是採用浮游選鑛法或重力選鑛法都沒有成效。此外,又有些重鑛物給選別这种鑛物精選方法的过程帶來很大困难。还有的是屬於另外選别之例的,譬如,当所選出的精鑛不符合標準要求,或当需要比現有標準規定的質量更高的精鑛時,就需要再精選。在再精選作業的过程中,常常要除掉精鑛中的硫化物成份,如在選別鎢、含錫、復雜的铁和其他鑛物時,所選出的精鑛中就含有金屬的硫化物。但有
In the mineral raw materials industry, there is a coarse-grained distribution of minerals that make up almost the same proportion of minerals. Separation of such ore, whether it is the use of floatation or gravity dressing method ineffective. In addition, there are some heavy minerals that have caused great difficulty in the process of selecting these mineral selection methods. There are other examples of selection, for example, when the selected concentrate does not meet the standard requirements, or when the need for higher quality than the existing standards of concentrate, you need to re-select. In the process of re-selection, it is often necessary to remove the sulphide content of the concentrates, for example, when selecting tungsten, tin, complex iron and other minerals, the selected concentrates contain metal sulphides. But there