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Process for producing lithium salt from lepidolite by alkaline method
The invention discloses a process for producing lithium salt from lepidolite by an alkaline method. The process comprises the following steps: proportioning: mixing lepidolite, a sodium hydroxide solution and lime milk according to an accurate proportion to obtain ore pulp; high-pressure leaching is conducted, specifically, the ore pulp reacts for 1-5 h under the conditions that the temperature ranges from 200 DEG C to 280 DEG C and the pressure ranges from 1.5 MPa to 6.3 MPa, and a product mixed solution is obtained; and post-treatment: carrying out liquid-solid separation and washing on the product mixed liquor to obtain leaching residues, mother liquor and washing liquor, firstly carrying out impurity removal on the mother liquor and the washing liquor obtained by separation, and then carrying out purification, evaporation concentration, lithium precipitation, washing and drying to obtain the battery-grade lithium carbonate. According to the invention, a high-energy-consumption sintering process is canceled, so that the production energy consumption is reduced, and meanwhile, the carbon emission is reduced; and through alkaline high-pressure leaching, metal impurities such as iron, manganese, magnesium and zinc in the lepidolite ore directly enter a slag phase, so that the metal impurities in the solution are reduced, the solution purification process is simplified, the flow is shortened, and the production cost is reduced.
本发明公开一种锂云母碱法生产锂盐的工艺，包括步骤：配料：将锂云母、氢氧化钠溶液和石灰乳按照精确配比混合得到矿浆；高压浸出：将所述矿浆在温度为200~280℃，压力为1.5~6.3MPa的条件下反应1~5h，得到产物混合液；后处理:将所述产物混合液进行液固分离和洗涤工序，得到浸出渣、母液和洗涤液，将所述分离得到的母液和洗涤液首先经过除杂，后通过净化、蒸发浓缩、沉锂、洗涤干燥工序后得到电池级碳酸锂。本发明取消了高耗能的烧结过程，降低了生产能耗，同时减少了碳排放；通过碱性高压浸出，使锂云母矿石中的铁、锰、镁、锌等金属杂质，直接进入渣相，减少了溶液中的金属杂质，简化了溶液净化工艺，缩短了流程，降低了生产成本。
Process for producing lithium salt from lepidolite by alkaline method
The invention discloses a process for producing lithium salt from lepidolite by an alkaline method. The process comprises the following steps: proportioning: mixing lepidolite, a sodium hydroxide solution and lime milk according to an accurate proportion to obtain ore pulp; high-pressure leaching is conducted, specifically, the ore pulp reacts for 1-5 h under the conditions that the temperature ranges from 200 DEG C to 280 DEG C and the pressure ranges from 1.5 MPa to 6.3 MPa, and a product mixed solution is obtained; and post-treatment: carrying out liquid-solid separation and washing on the product mixed liquor to obtain leaching residues, mother liquor and washing liquor, firstly carrying out impurity removal on the mother liquor and the washing liquor obtained by separation, and then carrying out purification, evaporation concentration, lithium precipitation, washing and drying to obtain the battery-grade lithium carbonate. According to the invention, a high-energy-consumption sintering process is canceled, so that the production energy consumption is reduced, and meanwhile, the carbon emission is reduced; and through alkaline high-pressure leaching, metal impurities such as iron, manganese, magnesium and zinc in the lepidolite ore directly enter a slag phase, so that the metal impurities in the solution are reduced, the solution purification process is simplified, the flow is shortened, and the production cost is reduced.
本发明公开一种锂云母碱法生产锂盐的工艺，包括步骤：配料：将锂云母、氢氧化钠溶液和石灰乳按照精确配比混合得到矿浆；高压浸出：将所述矿浆在温度为200~280℃，压力为1.5~6.3MPa的条件下反应1~5h，得到产物混合液；后处理:将所述产物混合液进行液固分离和洗涤工序，得到浸出渣、母液和洗涤液，将所述分离得到的母液和洗涤液首先经过除杂，后通过净化、蒸发浓缩、沉锂、洗涤干燥工序后得到电池级碳酸锂。本发明取消了高耗能的烧结过程，降低了生产能耗，同时减少了碳排放；通过碱性高压浸出，使锂云母矿石中的铁、锰、镁、锌等金属杂质，直接进入渣相，减少了溶液中的金属杂质，简化了溶液净化工艺，缩短了流程，降低了生产成本。
Process for producing lithium salt from lepidolite by alkaline method
一种锂云母碱法生产锂盐的工艺
WANG JIAN (author) / HAN RUSONG (author) / WANG CHUANG (author) / ZHAO HAOHAN (author) / CHEN GUOHUA (author) / ZHANG JUNKE (author)
2024-08-13
Patent
Electronic Resource
Chinese
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