Extraction of valuable metals from lepidolite

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• 作者：Qunxuan Yan ; Xinhai Li ; ^{yanqunxuan@163.com} ; Zhixing Wang ; Xifei Wu ; Huajun Guo ; Qiyang Hu ; Wenjie Peng ; Jiexi Wang
• 关键词：Lepidolite ; Lithium ; Water leaching ; Freezing desalination
• 刊名：Hydrometallurgy
• 出版年：2012
• 出版时间：April, 2012
• 年：2012
• 卷：117-118
• 期：Complete
• 页码：116-118
• 全文大小：245 K

文摘

Salt roasting with Na₂SO₄ + CaCl₂ followed by water leaching was used to extract alkali metals from lepidolite. The experiments indicated that the best mass ratio of lepidolite /Na₂SO₄/CaCl₂ during roasting was 1:0.5:0.3. The extraction of Li, Rb and Cs were all > 90 % after 0.5 h at 880 ¡ãC. The recovery of Li was essentially constant when roasted at 830-930 ¡ãC. The flexible roasting condition is easily controlled in industrial application. After leaching in water, the solution was cooled to ?#xA0;5 ¡ãC for 2 h to crystallise 92.1 % of the sulphate and 3.9 % of the chloride as Na₂SO₄¡¤10H₂O and NaCl, respectively. Evaporation and precipitation using Na₂CO₃ produced Li₂CO₃ crystals with > 99.5 % purity and a solution from which Rb and Cs could be recovered.