Fluorene is an important material in organic chemical industry. It is usually extracted from the washing oil or anthracene oil distillate of coal tar.

芴是重要的有机化工原料，多从煤焦油的洗油馏份中提出，也可从蒽油中提出。

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Phosphorus-gypsum is a by-product of phosphoric acid and some Compound Washing product industry . Powdered coal ash is a kind of powder which collected from waste gases of coal ash boiler .

磷石膏是磷酸工业和某些合成洗涤产品工业的副产品，粉煤灰是在煤灰锅炉废气中收集下来的粉末。

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It is applies to various researching and industry environment: water treatment plant, deep well reservoir, ocean, river, oil tank, coal washing plant and tank restored mushy or slurry.

适用于各种研究和工业环境；水处理厂、深井水库、海洋、河流、储油罐、洗煤厂、装有糊状或泥浆的罐。

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