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›› 2010, Vol. 10 ›› Issue (3): 542-547.

• 过程与工艺 • Previous Articles     Next Articles

Leaching Kinetics of Pyrolusite Using Cane Molasses as Reductant in Sulfuric Acid Solution

SU Hai-feng CUI Wei SUN Ying-yun LV Xiao-yan WEN Yan-xuan   

  1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning School of Chemistry and Chemical Engineering, Guangxi University, Nanning School of Chemistry and Chemical Engineering, Guangxi University, Nanning Educational administration department, Guangxi University School of Chemistry and Chemical Engineering, GX University
  • Received:2010-03-02 Revised:2010-04-16 Online:2010-06-20 Published:2010-06-20
  • Contact: SU Hai-feng

废糖蜜-硫酸溶液中软锰矿的浸出动力学

粟海锋 崔嵬 孙英云 吕小艳 文衍宣   

  1. 广西南宁市广西大学化学化工学院 广西南宁市广西大学化学化工学院 广西大学化学化工学院 , 南宁 广西大学教务处 广西大学化学化工学院
  • 通讯作者: 粟海锋

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Abstract: The leaching kinetics of manganese from a pyrolusite ore by cane molasses as reducing agent in dilute sulfuric acid solution was studied. In order to elucidate the leaching kinetics of manganese, the influences of various parameters were investigated. The results showed that increasing the concentration of sulfuric acid, the concentration of cane molasses and the reaction temperature, or reducing the particle size (r0), could accelerate the leaching rate of manganese. A shrinking core model was used to describe the leaching process, and the kinetic equation was obtained. The leaching process of manganese was controlled by the interfacial chemical reaction. The apparent activation energy was calculated to be 45.6 kJ/mol, and the apparent reaction order was 0.52 and 0.28 for sulfuric acid and cane molasses, respectively.

Key words: pyrolusite, cane molasses, leaching, kinetics

摘要： 用收缩芯模型研究了硫酸介质中废糖蜜还原浸出软锰矿的动力学，考察了软锰矿粒度、反应温度、浸出时间、硫酸浓度和废糖蜜浓度对锰浸出速率的影响. 结果表明，提高反应温度、硫酸浓度、废糖蜜浓度和减小软锰矿颗粒的初始平均半径，均可提高锰的浸出速率. 废糖蜜还原浸出软锰矿属界面化学反应控制，表观活化能为45.6 kJ/mol，硫酸和废糖蜜的反应级数分别为0.52及0.28.

关键词: 软锰矿, 废糖蜜, 浸出, 动力学

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