铬渣NaCl浸出动力学  

Kinetics of chromium-containing slag leached by NaCl

作　　者：柴立元[1] 赵堃[1] 舒余德[1] 朱文杰[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2007年第3期445-449,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(20477059);教育部高等学校博士点专项科研基金资助项目(20040533048);教育部新世纪优秀人才支持计划资助项目(NCET-05-0689)

摘　　要：通过研究铬渣NaCl浸出过程中Cr(Ⅵ)浓度随时间的变化,建立该反应的动力学方程,确定初始pH值、振荡速度对反应速率常数的影响,并计算相应的反应表观活化能。结果表明,铬渣NaCl浸出过程为0.26级反应,反应速率常数为3.38×10-7 mol/(L.s);pH值和振荡速度增大,反应速率常数不断增大,CaCrO4溶解率增加,溶解速率加快;该反应的表观活化能为34.24 kJ/mol,Cr(Ⅵ)浸出速率受温度影响较大。The effects of initial pH value and shaking speed on reaction rate constant were confirmed with the change of Cr（Ⅵ） concentrations in leaching chromium-containing slag process by NaCl. Kinetic equation was established and the corresponding apparent activation energy was calculated. The results indicate that the leaching process is a 0.26 order reaction, and the reaction rate constant is 3.38 × 10^-7 mol/（L·s）, The reaction rate constant increases with the increase of pH value and shaking speed, And dissolution rate of CaCrO4 increases too. The apparent activation energy is 34.24 kJ/mol and temperature has great influence on Cr（Ⅵ） leaching rate.

关 键 词：铬渣 NACL 浸出 动力学 

分 类 号：X70[环境科学与工程—环境工程]