二氧化硅对磷石膏生产氧化钙过程的影响
The Impact Mechanism of Silicon Dioxide on the Production of Calcium Oxide from Phosphogypsum
张达平 1李珊 1杨秀山 1左伟 1郑旭 2赵强1
作者信息
- 1. 四川大学化学工程学院,四川 成都 610065;教育部磷资源综合利用与清洁加工工程研究中心,四川 成都 610065
- 2. 中国建筑材料科学研究总院,北京 100024
- 折叠
摘要
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.
Abstract
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.
关键词
氧化钙/磷石膏/二氧化硅Key words
calcium oxide/phosphogypsum/silicon dioxide引用本文复制引用
出版年
2024
NETL
NSTL
万方数据