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由于可供应用的非金属原料天然富矿或易选矿石已大量开采,以及各个工业部门对非金属矿产的需求不断增长,因此,利用低质量的原料和成分不太适用的原料就势在必
The availability of raw materials of low quality and less suitable raw materials is imperative because of the substantial exploitation of natural or alternative ore for non-metallic raw materials available and the increasing demand for non-metallic minerals from various industrial sectors