混合碱分解锂云母工艺实验研究  

Study on the Decomposition of Lepidolite Using mixed Alkali

作　　者：黄正奇 冯文平 娄金东 杨立新[1] 谢超 HUANG Zheng-qi;FENG Wen-ping;LOU Jin-don;YANG Li-xin;XIE Chao(College of Chemistry, Xiangtan University, Xiangtan 411105, China;China Bluestar Chonfar Engineering and Technology Co., Ltd., Changsha 410116, China)

机构地区：[1]湘潭大学化学学院,湖南湘潭411105 [2]中蓝长化工程科技有限公司,湖南长沙410116

出　　处：《精细化工中间体》2017年第6期55-60,共6页Fine Chemical Intermediates

摘　　要：研究了混合碱分解锂云母的工艺实验。考察了分解过程中,苛性碱用量、生石灰用量、水用量、反应时间、反应温度等因素对锂云母中锂、钾、铝、硅浸取率的影响。利用X射线衍射仪(XRD)对浸出渣的组成和各元素浸取率的变化进行了研究。结果表明,混合碱分解锂云母的优化工艺条件为:m(锂云母)∶m(氢氧化钠)∶m(水)∶m(氧化钙)=15.0∶30.0∶10.0∶4.5,反应温度为230℃,反应时间为5 h。在此条件下锂的浸取率85%以上,钾的浸取率为75%,铝、硅浸出率较低。A process for decomposing lepidolite using mixed alkali was studied. The effects of conditions including the dosage of caustic and quicklime, the consumption of water, reaction time and reaction temperature on leaching yield of lithium, potassium, aluminum, silicon were investigated. The composition of residue was studied by XRD and the change rule of each element in leaching solution was studied. The results showed that the optimal conditions were： mass ratio of lepidolite, caustic, quicklime and water was of 15.0：30.0：4.5：10.0, the reaction temperature of 230℃, and the reaction time of 5 hours. Under these conditions, the leaching rates of lithium and potassium were 85% and 75%, respectively, while aluminum and silicon were at a lower leaching rate.

关 键 词：锂云母 苛性碱 生石灰 锂收率 

分 类 号：TQ131.1[化学工程—无机化工]