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求助：请帮忙修改英语 已有14人参与
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With exploitation of phosphorus ore, the high-grade phosphorus ore is becoming less and less in the present resource. The utilization of poor phosphorus rocck and the purity of crude phosphoric acid have turned into issues urgently asked for resolving [2]. At the present time, phosphoric acid has two kinds of manufacturing manners of thermal process and wet process. In the thermal process, phosphorus is first produced by reduction of phosphate rock, followed by oxidation and hydration to give phosphoric acid. And in the wet process, acidolysis of phosphate rock and purification of crude phosphoric acid are included. Due to the presence of impurities in the raw material the produced phosphoric acid inevitably contains many chemical species, such as iron, aluminum, magnesium and fluorine etc., which seriously affect the quality of the product and limit its application. [ Last edited by ZHL0627 on 2010-4-10 at 21:11 ] |
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fei763
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4楼2010-04-12 13:25:59
mzyr888
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ZHL0627(金币+1):谢谢参与
ZHL0627(金币+10): 2010-04-17 11:00
ZHL0627(金币+1):谢谢参与
ZHL0627(金币+10): 2010-04-17 11:00
| With the development of phosphorus ore, the high-quality phosphorus ore is becoming less and less in the present resource. The utilization of poor phosphorus rocck and the purity of crude phosphoric acid have turned into issues urgently asked for resolving [2]. up to now, It is reported that phosphoric acid has two kinds of manufacturing manners of thermal process and wet process. In the thermal process, phosphorus is first synthesized by reduction of phosphate rock, followed by oxidation and hydration to give phosphoric acid. And in the wet process, crude phosphoric acid is subjected to acidolysis and purificate . unfortunately, Due to the presence of impurities in the raw material ,the produced phosphoric acid inevitably contains many chemical species, such as iron, aluminum, magnesium and fluorine etc., which seriously affect the quality of the product and limit its applications.多多指教！ |
3楼2010-04-11 20:42:13
linhai8008
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7楼2010-04-12 14:49:39
userhung
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9楼2010-04-12 16:12:53