苛化提纯盐湖锂矿回收含氟碳酸锂的研究  

Study on causticization and purification of salt lake lithium ore and recovery of fluorine-containing lithium carbonate

作　　者：许新芳 周小平 刘正锋 李磊 陈虎 李长明 Xu Xinfang;Zhou Xiaoping;Liu Zhengfeng;Li Lei;Chen Hu;Li Changming(Do-Fluoride Chemicals Co.,Ltd.,Jiaozuo 454150,China)

机构地区：[1]多氟多化工股份有限公司,河南焦作454150

出　　处：《无机盐工业》2020年第7期62-65,共4页Inorganic Chemicals Industry

摘　　要：主要论述了一种提纯盐湖锂矿和回收含氟碳酸锂的方法。工艺流程:盐湖锂矿(含氟碳酸锂)通过一次水洗涤除去其中所含的大部分可溶性杂质后,按一定配比将其投入到石灰乳料浆中加热到90~95℃反应4 h,过滤后得到氢氧化锂溶液,将氢氧化锂溶液在100~120℃下进行加压浓缩4 h精制得到钙镁离子和硅含量较低的氢氧化锂溶液;向精制后的氢氧化锂溶液中通入食品级二氧化碳沉锂得到工业级碳酸锂,或继续浓缩制备氢氧化锂;用以上工艺生产得到的工业级碳酸锂通过二次碳化、阳离子交换树脂除去钙镁离子、重结晶可得到硅含量为10×10^-6以内的高纯碳酸锂,或浓缩得到钙含量为5×10^-6、镁含量为2×10^-6以内的单水氢氧化锂。A method of purifying salt lake lithium ore and recovering fluorine-containing lithium carbonate was mainly described.The process flow was as follows:the salt lake lithium ore(fluorine-containing lithium carbonate) was washed by water to remove most of the soluble impurities contained in it,and then it was put into the lime milk slurry for heating to 90~95 ℃according to a certain proportion.Then it was filtered to obtain the lithium hydroxide solution after 4 h of reaction.The lithium hydroxide solution was pressurized and concentrated at 100 ~120 ℃ for 4 h to obtain lithium hydroxide solution with low content of calcium-and-magnesium ions and silicate.Food grade carbon dioxide was passed into the refined lithium hydroxide solution and the industrial-grade lithium carbonate was obtained,or preparing lithium hydroxide by concentration.The lithium hydroxide obtained by procedures above can be used to obtain high-purity lithium carbonate with silicon content less than10 ×10^-6 through secondary carbonization,cation exchange resin to remove calcium and magnesium ions and recrystallization.The lithium hydroxide can also be used to obtain lithium hydroxide monohydrate with calcium content less than5×10^-6 and magnesium content less than 2×10^-6 through concentration.

关 键 词：苛化 盐湖锂矿 阳离子交换树脂 碳酸锂 

分 类 号：TQ131.11[化学工程—无机化工]