钛石膏制备硫化钙回收硫磺工艺研究  

Study on Recovery Process of Sulfur from Calcium Sulfide Prepared by Red Gypsum

作　　者：苏雪梅 汪初雷 先玉生 陈盛龙 熊宇帆 马小玲 谭宏斌[1] 杨飞华 Su Xuemei;Wang Chulei;Xian Yusheng;Chen Shenglong;Xiong Yufan;Ma Xiaoling;Tan Hongbin;Yang Feihua(School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang,Sichuan 621010;State Key Laboratory of Solid Waste Reuse for Building Materials,Beijing 100041)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]固废资源化利用与节能建材国家重点实验室,北京100041

出　　处：《非金属矿》2022年第1期12-14,共3页Non-Metallic Mines

基　　金：四川省科技厅重点研发项目(2020YFS0334)。

摘　　要：在硫酸法生产钛白粉过程中,采用石灰中和硫酸废水时产生固体废石膏钛石膏。在900℃温度下,以钛石膏为反应物,以碳粉为还原剂,研究了煅烧时间对硫酸钙生成的影响。结果表明,碳粉与钛石膏不混合反应6 h或碳粉与钛石膏混合反应2 h后,样品的主要物相均为硫化钙。在硫化钙中加入稀硫酸,产生的气体用络合铁溶液回收,得到粒径为1-3μm硫磺颗粒沉淀。Red gypsum is a kind of solid waste gypsum produced by using lime to neutralize sulfuric acid wastewater, which is produced in the manufacture process of titanium dioxide by sulfuric acid process. The effect of calcination time on the formation of calcium sulfate was studied with red gypsum as reactant and carbon powder as reducing agent at 900 ℃. It was found that the main phase of the sample was calcium sulfide after 6 h of unmixed reaction between carbon powder and red gypsum or 2 h of mixed reaction between carbon powder and red gypsum when the reaction time was 6 h. Dilute sulfuric acid is added to calcium sulfide, and the generated gas is recovered with complex iron solution to obtain a particle size of 1-3 μm sulfur particle precipitation.

关 键 词：钛石膏 还原焙烧 硫化钙 硫化氢 硫磺 

分 类 号：TQ132.32[化学工程—无机化工]