首页 | 本学科首页   官方微博 | 高级检索  
     

高镁磷尾矿中磷和镁在硫酸中的溶解动力学
引用本文:黄芳,王华,李军旗,陈义,王政.高镁磷尾矿中磷和镁在硫酸中的溶解动力学[J].过程工程学报,2009,9(6):1121-1126.
作者姓名:黄芳  王华  李军旗  陈义  王政
作者单位:1. 昆明理工大学材料与冶金工程学院,云南,昆明,650093;贵州大学材料与冶金学院,贵州,贵阳,550003
2. 昆明理工大学材料与冶金工程学院,云南,昆明,650093
3. 贵州大学材料与冶金学院,贵州,贵阳,550003
基金项目:贵州省科学技术基金资助项目 
摘    要:对高镁磷尾矿中磷和镁在硫酸中的溶解动力学进行了研究,考察了固膜产物的物相形态变化及搅拌强度、反应温度和硫酸质量分数对溶解过程的影响. 结果表明,包含自阻化因素的德罗兹多夫方程能较好地描述P2O5和MgO的溶解过程,且二者溶解的阻缓系数均大于1.6,其表观活化能分别为14.881和11.908 kJ/mol,为固膜内扩散控制.

关 键 词:高镁磷尾矿  溶解  动力学  活化能
收稿时间:2009-7-10
修稿时间:2009-8-17

Dissolution Kinetics of P and Mg in Phosphate Tailings with High Magnesium Content in Sulfuric Acid
HUANG Fang,WANG Hua,LI Jun-qi,CHEN Yi,WANG Zheng.Dissolution Kinetics of P and Mg in Phosphate Tailings with High Magnesium Content in Sulfuric Acid[J].Chinese Journal of Process Engineering,2009,9(6):1121-1126.
Authors:HUANG Fang  WANG Hua  LI Jun-qi  CHEN Yi  WANG Zheng
Abstract:The dissolution kinetics of phosphate tailings with high magnesium content in sulfuric acid was studied. The effects of reaction temperature and sulfuric acid concentration on acid digestion process of P and Mg were discussed. The Drozdov equation taking into account of the self-impeding effect was selected to simulate the dissolution kinetics of P_2O_5 and MgO. The results showed that reaction rate constant k changed with reaction temperature and sulfuric acid concentration, and retardancy coefficient b of MgO was higher than that of P_2O_5. Activation energy of P_2O_5 dissolution was 14.881 kJ/mol and that of MgO 11.908 kJ/mol, the effects of phase and morphology of solid film on dissolution of P and Mg were important, which indicated that the reactions of tailing dissolved by sulfuric acid were controlled by diffusion.
Keywords:phosphate tailings with high magnesium content  dissolution  kinetics  activation energy
本文献已被 万方数据 等数据库收录!
点击此处可从《过程工程学报》浏览原始摘要信息
点击此处可从《过程工程学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号