锂辉石水热钾碱分解制取碳酸锂相平衡模拟与优化试验  

Preparing Lithium Carbonate via Hydrothermal of Spodumene and Potash:Phase Equilibrium Simulation and Optimization Experiment

作　　者：姚文贵[1,2] 马鸿文 刘梅堂[1,2] 蒯雨晴 YAO Wen-gui;MA Hong-wen;LIU Mei-tang;KUAI Yu-qing(School of Materials Science and Technology,China University of Geosciences,Beijing 100083,China;Blue Sky Technology Corporation,Beijing 100083,China)

机构地区：[1]中国地质大学(北京)材料科学与工程学院,北京100083 [2]昊青薪材(北京)技术有限公司,北京100083

出　　处：《有色金属（冶炼部分）》2021年第4期28-35,共8页Nonferrous Metals（Extractive Metallurgy)

基　　金：中央高校基本科研业务费资助项目(2562017382)。

摘　　要：在综合分析锂辉石精矿物相组成基础上,采用OLI Analyzer软件对LiAlSi_(2)O_(6)-K_(2)CO_(3)-H_(2)O体系锂辉石水热分解反应多相平衡进行模拟。结果表明,β-锂辉石在热力学上极易与K_(2)CO_(3)反应生成麦钾沸石和碳酸锂,当K_(2)CO_(3)加入量为K^(+)/Li^(+)≥1.4时,即可完全转化。水热试验获得的优化条件为:K_(2)CO_(3)加入量为K^(+)/Li^(+)=1.5、反应温度240℃、反应时间120min、水固质量比4,此条件下锂辉石中锂的浸出率为96.43%,最终反应产物主要为麦钾沸石与碳酸锂,与模拟结果相一致。Based on comprehensive analysis of mineral phase composition of spodumene concentrate,OLI Analyzer software was used to simulate multiphase equilibrium of hydrothermal decomposition reaction of spodumene in LiAlSi_(2)O_(6)-K_(2)CO_(3)-H_(2)O system.The simulation results show thatβ-spodumene is thermodynamically easy to react with K_(2)CO_(3) to produce merlinoite and lithium carbonate.K_(2)CO_(3)can be converted completely when added in K^(+)/Li^(+)≥1.4.The hydrothermal experiment results show that leaching rate of lithium in spodumene is 96.43% under the optimum conditions including dosage of K_(2)CO_(3) of K^(+)/Li^(+)=1.5,reaction temperature of 240℃,reaction time of 120 min,and mass ratio of water to solid of 4.The composition of products are mainly merlinoite and lithium carbonate,which is consistent with the simulation results.

关 键 词：锂辉石 碳酸钾 OLI模拟 碳酸锂 麦钾沸石 

分 类 号：TF826.3[冶金工程—有色金属冶金] TQ131.1[化学工程—无机化工]