Abstract Lepidolite is an important mineral resource of lithium, rubidium and cesium. Lithium, rubidium and cesium were extracted simultaneously from a lepidolite concentrate by sulfuric acid baking and water leaching. A crystallization-roasting-dissolution-solvent extraction process was developed to recover cesium from the leach solution in this study. During crystallization, leach solution was cooled from 85 °C to 35 °C firstly to precipitate most parts of Rb+ with 98.65% and Cs+ with 94.59% in the form of RbAl(SO4)2·xH2O and RbAl(SO4)2·xH2O, respectively. The mixed alums were then roasted at 900 °C to decompose them into Cs2SO4, Rb2SO4, K2SO4 and Al2O3. Next, a mixed sulfates solution with 12.51 g/L Rb+ and 2.4 g/L Cs+ was obtained by water dissolution of the roasted alums. Cesium was then separated from the solution by solvent extraction, scrubbing and stripping. A Cs-loaded organic phase with 4.66 g/L Cs+ and 3.05 g/L Rb+ was obtained after a four-stage countercurrent extraction. Around 99.20% of Cs+ and 10.44% of Rb+ were extracted by using 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP). After scrubbing and stripping of the Cs-loaded organic phase by diluted H2SO4, a cesium sulfate solution of 16.6 g/L Cs+ was obtained. A cesium sulfate product with a purity of 98.47 wt% was then recovered by evaporation and crystallization of the stripping solution

中文翻译：

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锂云母精矿硫酸焙烧浸出液中硫酸铯的分离回收

摘要 锂云母是锂、铷和铯的重要矿产资源。通过硫酸焙烧和水浸从锂云母精矿中同时提取锂、铷和铯。在本研究中，开发了结晶-焙烧-溶解-溶剂萃取工艺以从浸出溶液中回收铯。在结晶过程中，浸出液首先从85℃冷却到35℃，以RbAl(SO4)2·xH2O和RbAl(SO4)2·xH2O的形式沉淀大部分的Rb+和94.59%的Rb+和94.59%，分别。然后将混合的明矾在 900 °C 下焙烧，使其分解为 Cs2SO4、Rb2SO4、K2SO4 和 Al2O3。接下来，通过将焙烧明矾水溶解得到具有 12.51 g/L Rb+ 和 2.4 g/L Cs+ 的混合硫酸盐溶液。然后通过溶剂萃取从溶液中分离铯，擦洗和剥离。经四级逆流萃取后，得到载有 Cs 的有机相，其中 Cs+ 含量为 4.66 g/L，Rb+ 含量为 3.05 g/L。使用 4-叔丁基-2-(α-甲基苄基) 苯酚 (t-BAMBP) 提取了约 99.20% 的 Cs+ 和 10.44% 的 Rb+。用稀硫酸洗涤和汽提载有 Cs 的有机相后，得到 16.6 g/L Cs+ 的硫酸铯溶液。然后通过汽提溶液的蒸发和结晶回收纯度为98.47wt%的硫酸铯产品 得到 16.6 g/L Cs+ 的硫酸铯溶液。然后通过汽提溶液的蒸发和结晶回收纯度为98.47wt%的硫酸铯产品 得到 16.6 g/L Cs+ 的硫酸铯溶液。然后通过汽提溶液的蒸发和结晶回收纯度为98.47wt%的硫酸铯产品