摘要
考察了铬渣中的六价铬的在硫酸中浸出行为,分别研究了温度、硫酸浓度和铬渣粒径对酸溶性六价铬浸出的影响。研究表明,酸溶性六价铬酸浸为化学反应过程,可用"颗粒不变缩核收缩芯模型"进行描述,通过尝试法,确定酸溶性六价铬浸出过程为内扩散控制类型,表观活化能为9.32 kJ/mol;在此基础上,经多元回归分析,得到了表观反应速率常数关于温度、硫酸浓度和铬渣粒径的经验表达式。
In this paper, leaching activities of Cr （ Ⅵ ） from chromite ore processing residue （COPR） in sulfuric acid solution were investigated, the effects of temperature （T） , concentration of sulfuric （ co ） acid and particle size （ro ） of COPR on leaehing kinetics were studied. The results showed that the dissolution of acid-solu- ble Cr （Ⅵ） is caused by the reaction between COPR and sulfuric acid, and the leaching process can be described by shrinkage core model by data fitting, it is confirmed that leaching kinetics is controlled by intra-particle diffusion, the apparent activation energy is 9.32 kJ/mol. Based on theory model, an experiential formula ineluding three parameters （T,co and ro） is proposed through multiple regression analysis.
出处
《环境工程学报》
CAS
CSCD
北大核心
2007年第10期90-93,共4页
Chinese Journal of Environmental Engineering
基金
国家"十五"攻关计划资助项目(2002BA906A74)
关键词
铬渣
酸浸
酸溶性六价铬(Ⅵ)
动力学
chromite ore processing residue
acid leaching
acid-soluble Cr（Ⅵ）
kinetics
