【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。更多还原

【Abstract】 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 was190 ℃,and the reaction time was 4 h.The conversion rate of lepidolite was 98.2% under above conditions.The main advantages 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 environment of alkaline liquid;4)As the by-product is the wide-applied aluminum-silica sol,through the by-product sales can greatly reduced the cost of extracting lithium.更多还原