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Process for recovering lithium from neutralized and impurity-removed lithium slags
The invention discloses a process for recovering lithium from neutralized and impurity-removed lithium slags, and relates to the field of lithium recovery. The process comprises the following steps of S1, adding circulating water into the neutralized and impurity-removed lithium slags, pulping, slowly adding an inorganic acid substance, continuously and slowly stirring, and adjusting the pH value of the solution; and S2, carrying out solid-liquid separation by using a plate-and-frame filter press, squeezing to obtain re-dissolved gypsum and a lithium-containing mother solution, returning the lithium-containing mother solution to a slurry mixing process, and adding calcium carbonate for neutralization. According to the process, sulfuric acid is added into the lithium slags obtained by neutralizing spodumene and removing impurities for re-dissolution, the pH value is controlled, lithium adsorbed in the lithium slags is dissolved in the solution, the solution is returned to the slurry mixing and calcium carbonate adding process, the re-dissolved gypsum is easy to filter, the loss of entrained lithium is small, the lithium recovery rate of the impurity-removed lithium slags can be larger than 90% through the process, the lithium extraction yield of spodumene is increased, and the production cost is reduced.
本发明公开了一种从中和除杂锂渣中回收锂的工艺，涉及锂回收领域，本发明包括如下步骤，步骤一，将中和除杂的锂渣加入循环水打浆，缓慢加入无机酸性物质，并持续缓慢搅拌，调节溶液的PH值；步骤二，通过板框压滤机进行固液分离，压榨得到返溶石膏和含锂母液，将含锂母液返回至调浆工序，加入碳酸钙中和，本发明通过对锂辉石中和除杂的锂渣加硫酸返溶，控制PH的值，将锂渣中吸附的锂溶解在溶液，溶液返回至调浆加碳酸钙工序中，返溶石膏容易过滤，且夹带锂损失较小，该工艺可实现对除杂锂渣的锂回收率大于90％，提高锂辉石提锂的收率，降低生产成本。
Process for recovering lithium from neutralized and impurity-removed lithium slags
The invention discloses a process for recovering lithium from neutralized and impurity-removed lithium slags, and relates to the field of lithium recovery. The process comprises the following steps of S1, adding circulating water into the neutralized and impurity-removed lithium slags, pulping, slowly adding an inorganic acid substance, continuously and slowly stirring, and adjusting the pH value of the solution; and S2, carrying out solid-liquid separation by using a plate-and-frame filter press, squeezing to obtain re-dissolved gypsum and a lithium-containing mother solution, returning the lithium-containing mother solution to a slurry mixing process, and adding calcium carbonate for neutralization. According to the process, sulfuric acid is added into the lithium slags obtained by neutralizing spodumene and removing impurities for re-dissolution, the pH value is controlled, lithium adsorbed in the lithium slags is dissolved in the solution, the solution is returned to the slurry mixing and calcium carbonate adding process, the re-dissolved gypsum is easy to filter, the loss of entrained lithium is small, the lithium recovery rate of the impurity-removed lithium slags can be larger than 90% through the process, the lithium extraction yield of spodumene is increased, and the production cost is reduced.
本发明公开了一种从中和除杂锂渣中回收锂的工艺，涉及锂回收领域，本发明包括如下步骤，步骤一，将中和除杂的锂渣加入循环水打浆，缓慢加入无机酸性物质，并持续缓慢搅拌，调节溶液的PH值；步骤二，通过板框压滤机进行固液分离，压榨得到返溶石膏和含锂母液，将含锂母液返回至调浆工序，加入碳酸钙中和，本发明通过对锂辉石中和除杂的锂渣加硫酸返溶，控制PH的值，将锂渣中吸附的锂溶解在溶液，溶液返回至调浆加碳酸钙工序中，返溶石膏容易过滤，且夹带锂损失较小，该工艺可实现对除杂锂渣的锂回收率大于90％，提高锂辉石提锂的收率，降低生产成本。
Process for recovering lithium from neutralized and impurity-removed lithium slags
一种从中和除杂锂渣中回收锂的工艺
ZHU QIANGHUI (author) / ZHONG LIANG (author) / LI XUEYONG (author) / YUAN SONG (author) / QIU YAN (author) / YUAN LU (author)
2021-12-03
Patent
Electronic Resource
Chinese
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