硅质磷矿高钙配比热法磷酸工艺研究

Study on thermal process of phosphoric acid for silicon phosphate rock adopting high calcium component

本文针对硅质磷矿探索了高钙硅比实验条件下采用热法生产磷酸的工艺。实验结果表明:当反应温度为1300℃,停留时间为180 min时,在不同的钙硅比下,磷的转化率都能达到85%以上。而强化剂AHP的添加可使磷的转化率达到90%以上。相图分析和X射线衍射表明,控制CaO/SiO2=3.0(质量比)左右时,残渣可以作为水泥生产的熟料。

Thermal process of phosphoric acid applying silicon phosphate rock was investigated in an experiment under the condition of high CaO/SiO2ratio. The results indicated that all yield of P2O5 was more than 85% in different CaO/SiO2 when the reaction temperature is 1300 ℃ and the residence time is 180 rain. Furthermore, the yield was more than 900,6 while adding enhancer AHP. The phase diagram and Xray diffraction showed that when the ratio CaO/SiO2 was about 3.0, the residue can be used as cement clinker.