工程科学学报Issue(8)：994-999,6.DOI:10.13374/j.issn2095-9389.2015.08.004
红土镍矿非自由水脱除热分析动力学
Thermal analysis kinetics of non-free water removal in nickel laterite
摘要
Abstract
Differential scanning calorimetric ( DSC) data during non-free water removal in nickel laterite were determined with a NETZSCH STA 449C thermal analyzer. Experiments were carried out at four heating rates of 10, 15, 20 and 25℃·min-1 . According to these DSC curves at different heating rates, the activation energies were calculated by five different calculation methods of conversion rate, namely the Flynn-Wall-Ozawa ( FWO) , Hu-Gao-Zhang ( HuGZ) , Boswell, Starink, and Friedman-Reich-Levi ( Friedman) methods. The pre-exponential factor ( A) and the most probable mechanism function were determined by the Malek method, then the relationship between reaction degree and time under an isothermal condition was derived and the energy consumptions at different temperatures were analyzed and compared. The average activation energy of non-free water removal in nickel laterite is 181. 50 kJ· mol-1. The average lnA is 21. 95 min-1. The most probable mechanism function fits the Zhuralev- Lesokin- Tempelman (Z-L-T) equation well. The non-free water removal is controlled by three-dimensional diffusion. The average power decreases with increasing temperature.关键词
红土镍矿/脱水/热分析/动力学/活化能Key words
nickel laterite/dewatering/thermal analysis/kinetics/activation energy分类
矿业与冶金引用本文复制引用
刘梅,吕学伟,白晨光,邓青宇,宋晶晶..红土镍矿非自由水脱除热分析动力学[J].工程科学学报,2015,(8):994-999,6.基金项目
国家自然科学基金资助项目(51234010) （51234010）
