氟磷灰石还原过程热力学分析

采用FactSage 6.4热力学软件对不同体系下氟磷灰石的还原进行了热力学分析，探明了高磷鲕状赤铁矿中的某些组分对氟磷灰石还原的影响.计算结果表明，在无其他添加剂的条件下，氟磷灰石在1174℃ 时会发生脱氟反应生成Ca₃(PO₄)₂和CaF₂，在1439℃时被碳还原成CaF₂，CaO和P₂;CaO对氟磷灰石的还原没有直接影响，而SiO₂，Al₂O₃和Fe能使氟磷灰石的起始还原温度由1439℃分别降低至1204，1247，1277℃，促进氟磷灰石的还原.热力学计算结果与文献中实验得出的结论相吻合，表明热力学模拟分析可作为氟磷灰石还原特性研究的指导手段.

Thermodynamic Analysis of the Reduction Process of Fluorapatite

A thermodynamic analysis on the reduction of fluorapatite in different systems was conducted by using the FactSage 6.4 thermochemical software. The effects of some components of high-phosphorus oolitic iron ore on the reduction of fluorapatite were studied. Results show that under non-additive condition， the defluorination of fluorapatite can be initiated at 1174℃ to produce Ca₃(PO₄)₂ and CaF₂; fluorapatite can be reduced to CaF₂， CaO and P₂ by carbon at 1439℃. CaO has no direct effect on the reduction of fluorapatite， while the minimum thermodynamic reduction temperatures of fluorapatite can be decreased by SiO₂， Al₂O₃ and Fe from 1439℃ to 1204， 1247 and 1277℃ respectively， which can facilitate the reduction process of fluorapatite. The thermodynamic results obtained are in good agreement with the available experimental results in the literatures， which indicates that thermodynamic analysis can be used to study the reduction characteristics of phosphate ore.