结果表明，经一次粗选、二次精选选别，可获稀土精矿品位52％。
The results show that a rare-earth concentrate with a grade of 52% can be obtained by one roughing and two cleanings.
此外增加了二次精选，可将矿浆的含泥量降到5%以下，铁矿品位提高2-3度；
In addition, can increase the secondary selected the granules in hydraulic fallen below 5 per cent, iron ore grade 2-3 degrees;
某铜矿通过对浮选工艺的技术改造：采取提高磨矿细度、增加二次精选及采用高效药剂等措施，使选矿技术指标得到了显著提高。
They adopted a few measures such as improving fineness of grinding ores, increasing secondary cleaning, using additional typed reagent and so on, thus making the technical indexes raised markedly.
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