两段细筛
Two-stage fine sieving
以上为机器翻译结果，长、整句建议使用 人工翻译 。
由于采用细筛再磨新工艺，近年来一些选矿厂已由两段磨矿改为三段磨矿。
Due to the fine screen new craft, grinding again in recent years some concentrator by two section has three segments grinding instead of grinding.
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