锂云母碱溶法提锂新工艺研究  

New process of lithium extraction from lepidolite by alkali dissolution

作　　者：王丁[1] 陈树[1] 刘昕昕[1] 程斌[1] 季清荣[1] 

机构地区：[1]江西省科学院应用化学研究所,江西南昌330000

出　　处：《无机盐工业》2014年第9期26-28,40,共4页Inorganic Chemicals Industry

摘　　要：研究了锂云母碱溶法提锂新工艺。通过对碱液浓度、固液比、反应温度、反应时间等因素对锂云母中锂的转化率影响的研究,确立了碱溶法处理锂云母的最佳条件:强碱溶液质量分数为50%,锂云母与强碱液质量体积比(g/mL)为1∶3.5,反应温度为190℃,反应时间为4 h。在该条件下锂云母中锂的转化率可以达到98.2%。该方法主要优点:1)锂云母中的锂100%进入溶液;2)可以使提钾、提铯、提铷转化工序一次完成;3)因为是在碱性液体环境下反应,锂云母中的氟不会生成强腐蚀性的氢氟酸腐蚀设备;4)副产品是具有广泛用途的铝硅溶胶,通过铝硅溶胶的直接销售可以大大降低提锂成本。The new process of extracting lithium from lepidolite by alkali dissolution was studied.Based on the research for the influences of alkali concentration, solid-liquid ratio, reaction temperature, and reaction time etc.on the conversion rate of lithium in the lepidolite, the optimum conditions for processing lepidolite by alkali dissolution were established, i.e.the mass fraction of alkali was 50%, the solid-liquid ratio （lepidolite powder to alkali solution） was 1：3.5, the reaction temperature was 190 ~C, and the reaction time was 4 h.The conversion rate of lepidolite was 98.2% under above conditions.The main advan- tages of this method include： 1 ）The lithium in lepidolite 100% into the solution;2）Extracting lithium/cesium/rubidium from lepidolite can be completed in one operation; 3 ）Do not generate hydrofluoric acid corrosion for equipment due to the environ- ment of alkaline liquid ;4）As the by-product is the wide-applied aluminum-silica sol ,through the by-product sales can great- ly reduced the cost of extracting lithium.

关 键 词：锂云母 碱溶法 提取锂 

分 类 号：TQ131.11[化学工程—无机化工]