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›› 2009, Vol. 9 ›› Issue (6): 1121-1126.

• 过程与工艺 • 上一篇    下一篇

高镁磷尾矿中磷和镁在硫酸中的溶解动力学

黄芳 王华 李军旗 陈义 王政   

  1. 贵州大学蔡家关校区材料与冶金学院 昆明理工大学材料与冶金工程学院 贵州大学材料科学与冶金工程学院 贵州大学材料科学与冶金工程学院 贵州大学材料科学与冶金工程学院
  • 收稿日期:2009-07-10 修回日期:2009-08-17 出版日期:2009-12-20 发布日期:2009-12-20
  • 通讯作者: 黄芳

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   

  1. Materials and Metallurgical College of Guizhou University College of Material and Metallurgy Engineering, Kunming University of Science and Technology School of Material and Metallurgy,Guizhou university School of Material and Metallurgy,Guizhou university School of Material and Metallurgy,Guizhou university
  • Received:2009-07-10 Revised:2009-08-17 Online:2009-12-20 Published:2009-12-20
  • Contact: HUANG Fang

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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

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 P2O5 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 P2O5. Activation energy of P2O5 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.

Key words: phosphate tailings with high magnesium content, dissolution, kinetics, activation energy

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