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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 . 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. |
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crazyff12345
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ZHL0627(金币+10, 翻译EPI+1): 2010-04-13 18:54
ZHL0627(金币+10):谢谢 2010-04-14 20:15
ZHL0627(金币+10):谢谢 2010-04-14 20:15
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With the increasing demand for phosphorus ore, the utilization of poor phosphorus rocck and the purification of crude phosphoric acid have drawn extensive attention in recent years. At present, there are two kinds of preparation methods for industrial production phosphoric acid, namely, thermal process and wet process. For thermal process, in the first instance, phosphorus is produced by reduction of phosphate rock, followed by oxidation and hydration so as to produce the phosphoric acid. While, for wet process, phosphate rock |
2楼2010-04-12 21:33:02
connie3625
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ZHL0627(金币+10):谢谢 2010-04-13 18:55
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With continuous consumption of phosphorus ore, natural resources of high-grade phosphorous ore is gradually exhausted and exploration of means to utilize poor phosphorus rock and purify crude phosphoric acid has become an urgent demand. At present, there are main two methods in phosphoric acid manufacturing, i.e., thermal process and wet process. In the thermal process, phosphoric acid is produced by oxidation and hydration of phosphorus reduced from phosphate rock. While in the wet process, procedures include acidolysis of phosphate rock and purification of crude phosphoric acid. However, restricted by the raw material, the produced phosphoric acid inevitably contains impurities, such as iron, aluminum, magnesium and fluorine, which is harmful for the quality and limit its application. 水平有限，希望有帮助~ |
3楼2010-04-12 21:34:20
crazyff12345
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ZHL0627(金币+10):谢谢 2010-04-14 20:17
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phosphate rock was acidolyzed and then purification of crude phosphoric acid. Due to the presence of impurities in the raw material , the production process would inevitably interfered by such iron, aluminum, magnesium and fluorine etc., Therefore, the application of the products was largely limited by the quality of the products. |
4楼2010-04-12 21:53:14