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

作　　者：张达平 李珊[1,2] 杨秀山[1,2] 左伟[1,2] 郑旭 赵强 ZHANG Da-ping;LI Shan;YANG Xiu-shan;ZUO Wei;ZHENG Xu;ZHAO Qiang(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Ministry of Education Engineering Research Center for Comprehensive Utilization and Clean Processing of Phosphorus Resources,Chengdu 610065,China;China Building Materials Academy Co.,Ltd.,Beijing 100024,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]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 [3]中国建筑材料科学研究总院,北京100024

出　　处：《现代化工》2024年第S02期280-284,289,共6页Modern Chemical Industry

基　　金：磷石膏低温还原分解制硫酸联产低碳钙基材料技术(2022YFC3902703)。

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SiO_(2)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,SiO_(2)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SiO_(2)与CaO化合生成Ca_(2)SiO_(4)等硅酸盐,从而降低CaO纯度。因此,SiO_(2)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 SiO_(2)and CaO will lead to the reduction of CaO purity in phosphogypsum production,in the actual reaction process,SiO_(2)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 SiO_(2)and CaO to produce silicates such as Ca_(2)SiO_(4),thus reducing the purity of calcium oxide.Therefore,SiO_(2)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 

分 类 号：O6[理学—化学]