铁锂云母精矿浸出液萃取法提锂研究  

Study on Lithium Extraction from Leaching Solution of Zinnwaldite

作　　者：匡晨 KUANG Chen(State Key Laboratory of Utilization of Low-grade Refractory Gold Ores,Zijin Mining Group Xiamen Zijin Mining and Metallurgy Technology Co.,Ltd.,Xiamen 361101,Fujian,China)

机构地区：[1]低品位难处理黄金资源综合利用国家重点实验室,厦门紫金矿冶技术有限公司,福建厦门361101

出　　处：《有色金属（冶炼部分）》2024年第8期48-53,共6页Nonferrous Metals（Extractive Metallurgy)

摘　　要：以铁锂云母矿石经焙烧—水浸获得水浸液为研究对象,明晰了溶液中钙、镁离子对萃取过程中两相分离的影响,考察了碳酸钠和氢氧化钠用量、水油相比对钙镁脱除效果及脱杂浸出液中锂萃取效果的影响。结果表明:铁锂云母矿石浸出液分别加入锂当量100%和镁摩尔量4倍的碳酸钠和氢氧化钠,在常温下反应1 h后,液固分离获得脱杂浸出液,钙、镁脱除率分别为>99.9%和82.53%;脱杂浸出液采用实验室改性后的M54-100-Cyanex923-磺化煤油萃取体系在O/A=1.5下模拟三级逆流萃取,Li、Na萃取率分别为90.85%和0.04%,载锂有机相在O/A=25下采用5.5 mol/L HCl模拟三级逆流反萃,Li的反萃率>99.9%,富锂反萃液中锂含量在26 g/L左右,一步实现锂的提纯和富集。Applying the water leaching solution obtained by roasting and water leaching of zinnwaldite ore as research object,the impact of calcium and magnesium ions in the solution on the separation of orgainc and aqueous phases during the extraction process was clearified.The effects of dosage of sodium carbonate and sodium hydroxide,and O/A on calcium and magnesium removal efficiency and extraction performance of lithium were illustrated.The results show that Na_(2)CO_(3) and NaOH were used as calcium and magnesium removal reagent with Na_(2)CO_(3) dosage of 100% lithium equivalent,NaOH dosage of four times the molar amount of magnesium under ambient temperature mixed for one hour,then liquid-solid separation was carried out to obtain impurity removed leaching solution.The removal efficiency of Ca and Mg is>99.9% and 82.53%,respectively.The self-modified M54-100-Cyanex923-sulfonated kerosene extraction system was used to simulate three-stage countercurrent extraction at O A=1.5,and the extraction rate of Li and Na is 90.85% and 0.04%,respectively.The lithium loaded organic phase is simulated by 5.5 mol L HCl at O/A=25,the stripping rate of Li is>99.9%,and the lithium content in the Li-rich stripping solution is about 26 g L,which realize the purification and enrichment of lithium in one step.

关 键 词：铁锂云母 杂质脱除 两相分离 串级萃取-反萃 

分 类 号：TF826.3[冶金工程—有色金属冶金]