磷石膏分解制备硫化钙的试验分析  

Experimental Study of Preparation of Calcium Sulfide from Thermal Decomposition of Phosphogypsum

作　　者：郑绍聪[1] 宁平[2] 成飞翔[1] 贺池先[1] 

机构地区：[1]曲靖师范学院化学化工学院,曲靖655011 [2]昆明理工大学环境科学与工程学院,昆明650093

出　　处：《土木建筑与环境工程》2013年第S2期160-163,共4页Journal of Civil,Architectural & Environment Engineering

摘　　要：在N2气氛下进行磷石膏还原分解制备硫化钙的研究,选择粒度分析仪测定原料粒径大小,XRD和扫描电镜表征原料和分解物固相特征。考察了原料摩尔配比、反应温度、反应时间和反应气氛等对磷石膏还原分解制备硫化钙的影响。结果表明:在N2气氛下,通过无烟煤过量形成充分的还原性气氛,磷石膏中硫酸钙被C或CO还原生成硫化钙。最佳的反应条件∶无烟煤∶磷石膏(C∶S)=2.4∶1;反应最佳温度900~1 000℃;反应时间2h,磷石膏转化率可达97.60%。In this paper,it was carried out for reduction decomposition of phosphogypsum to calcium sulfide under N2 atmosphere.The size of phosphogypsum was measured by Nano-ZS90Zetasizer.Scanning electron microscopy and XRD-ray diffraction were used to analyze the raw-material and decomposition solid production.These conditions were also studied on a carbon to CaSO4 molar ratio,reaction temperature,reaction time,and reaction atmosphere in the N2 atmosphere.The results showed that the optimal conditions for production of CaS are found to be a carbon to CaSO4 molar ratio of 2.4to 1,a temperature of 900~1000℃,a reaction time of 2h,and reductive atmosphere.Under these conditions the conversion rate of CaS from phosphogypsum amount to no less than 97.60%.

关 键 词：磷石膏 无烟煤 热分解 硫化钙 

分 类 号：TQ132.32[化学工程—无机化工]