| 氟磷酸钙真空碳热还原反应机理 |
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| 引用本文： | 刘予成,李秋霞,刘永成.氟磷酸钙真空碳热还原反应机理[J].真空,2012,49(3):84-87. |
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| 作者姓名： | 刘予成 李秋霞 刘永成 |
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| 作者单位： | 1. 云南师范大学化学化工学院 云南 昆明 650092
2. 昆明理工大学真空冶金国家工程实验室 云南 昆明 650093;昆明理工大学云南省有色金属真空冶金重点实验室 云南 昆明 650093 |
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| 基金项目： | 云南省科学自然基金资助项目(2007B045M) |
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| 摘 要： | 在真空条件下,本文采用热力学分析、XRD及化学分析等方法与手段,对SiO2在氟磷酸钙碳热还原制磷的过程进行了研究,考察了SiO2的添加量对磷矿还原率的影响.通过热力学研究,在压力100Pa温度低于1075℃ 时,Ca5(PO4)3F与C、SiO2的反应满足反应发生的热力学条件.实验研究表明:在真空度10Pa～80Pa,温度达到实验最高温度1550℃时,二氧化硅不能使氟磷酸钙发生脱氟反应,与热力学计算结果一致.还原率随着温度升高而增大,在低于1450℃时,添加SiO2有利于提高还原率；随m增加,还原率也增加,在1350℃时,还原率增大速度较快.由此作者提出了SiO2对氟磷酸钙真空碳热还原的反应机理.
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| 关 键 词： | 二氧化硅 真空碳热还原 还原率 反应机理 |
Carbothermal reduction mechanism of fluorapatite in vacuum |
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| LIU Yu-cheng
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LI Qiu-xia
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LIU Yong-cheng.Carbothermal reduction mechanism of fluorapatite in vacuum[J].Vacuum,2012,49(3):84-87. |
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| Authors: | LIU Yu-cheng LI Qiu-xia LIU Yong-cheng |
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| Affiliation: | 2,3(1.College of Chemistry and Chemical Engineering,Yunnan Normal University,Kunming 650092,China; 2.National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technology, Kunming 650093,China;3.Key Laboratory of Nonferrous Metals Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology,Kunming 650093,China) |
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| Abstract: | The influence of SiO2 content on the reduction rate of phosphate during fluorapatite carbothermal reduction process was investigated by thermodynamic analysis,XRD and element analysis in vacuum.Thermodynamic calculations indicated that reaction between Ca5(PO4)3F、C and SiO2 occurred below 1075℃ at 100Pa.Experimental results demonstrated that defluorination of the silica and fluorapatite can’t occur at 1550℃ under 10Pa~80Pa.Reduction rate increases with the increasing temperature,and the added SiO2 help to improve the reduction rate below 1450℃;As m increases,the reduction rate increasesd,especially at 1350℃.Thus,the reaction mechanism of SiO2 on fluorapatite carbothermal reduction in vacuum was proposed. |
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| Keywords: | silica vacuum carbothermal reduction reduction rate reaction mechanism |
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