研究了二氧化硅杂质对磷石膏生产氧化钙过程的影响。虽然热力学计算结果显示SiO₂与CaO化合会导致磷石膏生产的CaO纯度降低,但实际反应过程中,SiO₂对反应的阻碍作用才是导致生成CaO的纯度降低的原因;同时磷石膏中氟化钙的存在能够激发SiO₂与CaO化合生成Ca₂SiO₄等硅酸盐,从而降低CaO纯度。因此,SiO₂杂质会对磷石膏生产CaO过程产生显著的不利影响。对原料磷石膏进行脱硅和脱氟预处理将是获得高纯度CaO的必要条件。

The effect of silica impurities on the production of calcium oxide from phosphogypsum was studied.The results show that although the thermodynamic calculation results show that the combination of SiO₂ and CaO will lead to the reduction of CaO purity in phosphogypsum production,in the actual reaction process,SiO₂ is an obstacle to the reaction and leads to the reduction of CaO purity.At the same time,the presence of calcium fluoride in phosphogypsum can stimulate the combination of SiO₂ and CaO to produce silicates such as Ca₂SiO₄,thus reducing the purity of calcium oxide.Therefore,SiO₂ impurities will have a significant adverse effect on the production process of phosphogypsum CaO.Desiliconization and defluorination of phosphogypsum are the necessary conditions for obtaining high purity CaO.This study provides a clear direction for optimizing the process of phosphogypsum production of calcium oxide in industrial practice.

张达平(1997-),男,硕士生,研究方向为磷化工,zdp39458888@163.com;杨秀山(1984-),男,博士,副教授,研究方向为磷化工,通讯联系人,yangxiushan3@163.com。