Extraction of lithium from lepidolite by sulfation roasting and water leaching

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• 作者：Qunxuan Yan ^{yanqunxuan@163.com} ; Xinhai Li ; Zhixing Wang ; Xifei Wu ; Jiexi Wang ; Huajun Guo ; Qiyang Hu ; Wenjie Peng
• 关键词：Lepidolite ; Lithium ; Sulfation roasting ; Water leaching
• 刊名：International Journal of Mineral Processing
• 出版年：2012
• 期刊代码：43_03017516
• 类别：ce
• 出版时间：18 July, 2012
• 卷：110-111
• 期：Complete
• 页码：1-5
• 文件大小：746 K

摘要

Sulfation roasting followed by water leaching process was used to extract lithium from lepidolite. Various parameters including roasting temperature, the amount of additions, and solid/liquid ratio in leaching process were optimized. The lithium extraction efficiency of 91.61%could be reached with a mass ratio of lepidolite/Na₂SO₄/K₂SO₄/CaO of 1:0.5:0.1:0.1, and roasting at 850 掳C for 0.5 h. XRD analysis showed that sulfation roasting caused the decompositions of the original aluminosilicate to NaSi₃AlO₈, KAlSi₂O₆ and CaAl₂Si₂O₈. The phases of CaF₂ and Ca₄Si₂O₇F₂ are observed due to the addition of CaO.