摘要
在N2气氛下,利用热重分析仪和管式炉研究了高硫煤还原分解磷石膏过程中CaS的生成机理。研究表明,在1 000～1150℃温度范围内,磷石膏中的CaSO4与煤粉或汽化产生的CO反应是生成CaS的主要反应。CaS的生成机理可以通过固-固反应机理、气-固反应机理或联合作用机理等模型进行解释。通过对磷石膏分解产物的XRD-SEM图进行分析,结果表明,不同粒径高硫煤对CaS生成量的影响是通过改变CaS的生成机理来实现的。高硫煤粒径较小时,利于气-固反应的发生,而产生大量CaS,反之则以固-固反应机制为主,CaS的生成也相对难些。
Mechanism of calcium sulphide （CaS） generation in the process of phosphogypsum decomposition was investigated with Metteler Toledo thermogravimetric analyser and tube furnace. High-sulphur coal was used as a reducing agent under nitrogen atmosphere. In the temperature range 1 000-1 150℃, a chemical reaction between CaSO4 and carbon or CO was the key to generating CaS, which mechanism could be explained by a solid-solid, gas-solid or integrated reaction. The influence of coal particle size on CaS generation was analysed by XRD -SEM charts of phosphogypsum decomposed products. When the size of high-sulphur coal was very small, the gas-solid reaction mechanism would dominate to result in higher production of CaS. As larger particle size led to a domination of solid-solid reaction mechanism, the generation of CaS would be inhibited greatly.
出处
《上海环境科学》
CAS
CSCD
2011年第1期6-11,共6页
Shanghai Environmental Sciences
基金
国家高技术研究发展计划(863)项目，编号：2007AA06Z321
关键词
磷石膏
高硫煤
硫化钙
反应机理
Phosphogypsum High-sulphur coal Calcium sulphide Reaction mechanism
