The fluorine content in cleaned coal will be nearly same as its original matrix by two grade defluorination treatment.

用二级脱氟处理方法可使高纯煤中氟含量达到实际应用所允许的要求，接近原煤中的氟含量。

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The cleaned coal yield before and after ultrasonic treatment, the effect of flotation desulfurization and flotation speed were studied.

笔者对煤泥超声处理前后浮选的精煤产率、浮选脱硫效果、浮选速度等方面进行了试验研究。

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The result indicated that it can enhance the yield of cleaned coal, increase the slime water clarity, accelerate rate and reduce moisture content in press cake by adding PAM.

结果表明，添加聚丙烯酰胺可以明显提高精煤产率、尾煤灰分，亦可以提高煤泥水澄清度，显著加快过滤速度，降低滤饼水分。

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Coal handling certainly needs to be cleaned and cannot be allowed to pollute the air with particulates AT ALL. This will require technology, which we can perfect and then sell to other countries.

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The 69-year-old Ross amassed his fortune as a shrewd financier who bought up distressed companies in tired industries like coal, steel and textiles, cleaned up their balance sheets, improved management, then sold them for profits.

FORBES: Magazine Article