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过程工程学报 ›› 2015, Vol. 15 ›› Issue (5): 819-823.DOI: 10.12034/j.issn.1009-606X.215220CSTR: 32067.14.jproeng.215220

• 反应与分离 • 上一篇    下一篇

钾长石焙烧熟料的浸出动力学

刘佳囡 申晓毅 翟玉春   

  1. 东北大学材料与冶金学院 东北大学材料与冶金学院 东北大学冶金学院
  • 收稿日期:2015-05-20 修回日期:2015-07-02 出版日期:2015-10-20 发布日期:2015-10-20
  • 通讯作者: 刘佳囡

Leaching Kinetics of Potash Feldspar Roasted Clinker

LIU Jia-nan SHEN Xiao-yi ZHAI Yu-chun   

  1. School of Materials & Metallurgy, Northeastern Universi School of Materials and Metallurgy, Northeastern University School of materials and metallurgy, Northeastern University
  • Received:2015-05-20 Revised:2015-07-02 Online:2015-10-20 Published:2015-10-20
  • Contact: LIU Jia-nan

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被引次数

1

摘要： 以钾长石和Na2CO3焙烧熟料为原料，研究其在NaOH溶液中的浸出动力学. 考察了在不同温度和搅拌强度条件下SiO2浸出率与时间的关系. 结果表明，SiO2浸出的优化工艺条件为：浸出温度95℃、搅拌强度400 r/min、熟料粒度74~89 mm、NaOH溶液浓度0.2 mol/L和浸出时间80 min. 在该条件下，SiO2浸出率可达99%. 熟料浸出过程受无固体膜生成的化学反应和外扩散混合控制. 浸出过程分为两个阶段：0~10 min为反应前期，10~80 min为反应后期，表观活化能分别为15.24和29.94 kJ/mol. 前期和后期的浸出动力学方程分别为1-(1-a)1/3=7.074exp[-15239/(RT)]t和1-(1-a)1/3=45.85exp[-29940/(RT)]t.

关键词: 钾长石, 焙烧熟料, NaOH, 浸出, 动力学

Abstract: The leaching kinetics of roasted clinker with NaOH, which was obtained by roasting potash feldspar with Na2CO3, was studied. The effects of temperature and stirring intensity on the leaching rate of SiO2 were examined. The results showed that under the optimal conditions of leaching temperature 95℃, stirring intensity 400 r/min, clinker granularity 74~89 mm, NaOH concentration 0.2 mol/L, and leaching time 80 min, the leaching rate of SiO2 reached up to 99%. The leaching process of roasted clinker was mixed controlled by the chemical reaction and external diffusion without the solid product layer. The leaching process included the earlier stage in 0~10 min and the later stage during 10~80 min. The apparent activation energy of two stages was 15.24 and 29.94 kJ/mol, respectively. The kinetic equations could be expressed as 1-(1-a)1/3=7.074exp[-15239/(RT)]t and 1-(1-a)1/3= 45.85exp[-29940/(RT)]t, respectively.

Key words: potash feldspar, roasted clinker, NaOH, leaching, kinetics

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