化工进展2018，Vol.37Issue(1)：53-59,7.DOI:10.16085/j.issn.1000-6613.2017-0744
不同粒径磷石膏的脱水动力学
Kinetics of the thermal dehydration of phosphogypsum with different particle size
摘要
Abstract
To study the effect of particle sizes on the kinetics of the thermal dehydration of phosphogypsum,the TG-DSC simultaneous thermal analysis data of different sizes of phosphogypsum dehydration in the flowing N2atmosphere were measured. The Flynn-wall-Ozawa method,Kissinger method,and Satava-Sestak method were used to calculate the kinetic parameters of phosphogypsum dehydration kinetics model with different particle sizes(105—125μm,125—150μm,150—200μm and 200~300μm). The isothermal decomposition of phosphogypsum with different particle sizes under the same experimental conditions was predicted by the kinetic equation developed. The results showed that,while the phosphogypsum particle sizes decreased from 200—300μm to 105—125μm,the phosphogypsum dehydration activation energy in the first step fell from 114.62kJ/mol to 82.55kJ/mol,and then the second step declined from 96.30kJ/mol to 78.5kJ/mol. The phosphogypsum dehydration activation energy decreased with the reduction of its particle size and the mechanism function accords with the Avrami-Erofeev equation. At the same calcination temperature,the small particle sizes of phosphogypsum took less time to fully be dehydrated.关键词
磷石膏/粒径/脱水反应/动力学Key words
phosphogypsum/particle size/dehydration/kinetics分类
化学化工引用本文复制引用
杨萍,杨林,刘力,罗通,曹建新..不同粒径磷石膏的脱水动力学[J].化工进展,2018,37(1):53-59,7.基金项目
教育部"春晖计划"(Z2006-1-52004)及贵州省科技厅联合基金(黔科合LH字[2014]7618)项目. （Z2006-1-52004）
