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过程工程学报 ›› 2016, Vol. 16 ›› Issue (4): 684-691.DOI: 10.12034/j.issn.1009-606X.216149

• 材料工程专栏 • 上一篇    下一篇

低品位钾盐助剂焙烧与水浸及结晶制备钾盐

李刚1,朱媛媛2,易凌云2,赵伟3,杜爱玲1,齐涛4   

  1. 1. 山东大学化学与化工学院
    2. 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室
    3. 中国科学院过程工程研究所
    4. 中国科学院过程工程研究所绿色过程与工程重点实验室
  • 收稿日期:2016-03-02 修回日期:2016-04-05 出版日期:2016-08-20 发布日期:2016-10-10
  • 通讯作者: 李刚 lig@ipe.ac.cn

Preparation of Potassium Salt from Low Grade Potassium Ore with Additive-assisted Roasting, Water Leaching and Crystallization

LI Gang 1,ZHU Yuan-yuan 2,YI Ling-yun 2,ZHAO Wei 3,DU Ai-ling 1,QI Tao 4   

  1. 1. School of Chemistry and Chemical Engineering, Shandong University
    2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Processing Engineering, Chinese Academy of Science
    3. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences
    4. Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences
  • Received:2016-03-02 Revised:2016-04-05 Online:2016-08-20 Published:2016-10-10
  • Contact: LI Gang lig@ipe.ac.cn

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摘要： 采用助剂焙烧?水洗浸出?钾盐结晶分离工艺从低品位钾长石中提取钾盐，分析了分解机理与浸出动力学. 结果表明，加入复合助剂分解效果较好，在钾长石:氯化钙:碳酸钠?1:0.5:0.1(?)、800℃焙烧4 h及液固比1 mL/g、80℃水洗2 h的条件下，钾提取率可达91.88%. 使用CaCl2?NaCO3复合助剂能降低矿石分解温度，水洗浸出阶段主要受内扩散控制.

关键词: 钾长石, 钾盐, 焙烧, 浸出, 结晶, 动力学

Abstract: The technology of extracting potassium salt from low grade potash feldspar was studied by adopting the process of roasting?leaching?separation, and the decomposition mechanism and leaching kinetics were analyzed. The results showed that the decomposition efficiency of ores is better by adding mixed additive agents. The leaching rate of potassium reaches up to 91.88% under the optimum conditions of Ore:CaCl2:Na2CO3?1:0.5:0.1(?), roasting 4 h at 800℃, leaching 2 h at 80℃, ratio of liquid to solid of 1 mL/g. The CaCl2?Na2CO3 mixed additive could effectively decrease the decomposed temperature of ore. The stage of leaching potassium was controlled by internal diffusion process.

Key words: potash feldspar, potassium salt, roasting, leaching, crystallization, kinetics

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