This work studies a membrane electrolytic process, where a diluted lithium chloride brine solution is concentrated, while simultaneously producing lithium phosphate. This innovative process takes advantage of the alkaline pH generated in the cathodic section, allowing added phosphoric acid to be precipitated as lithium phosphate. The influence of the operation variables, such as temperature and current density, was evaluated to optimise the precipitation process. Some key findings were observed: a) the optimal conditions for the precipitation of lithium phosphate were 25 °C and 7.3 mA/cm², as the chemical equilibrium was reached in a shorter time period (15 min) under these operating conditions; b) the efficiency and stability of the cationic membrane was favoured at 25 °C; c) it was possible to concentrate the lithium chloride brine solutions to precipitate lithium phosphate, while neutralising the alkaline pH of the cathodic section; and d) the experimental results could be explained using fundamental thermodynamics.

这项工作研究了一种膜电解工艺，其中浓缩了稀释的氯化锂盐水溶液，同时生产磷酸锂。这一创新工艺利用了阴极部分产生的碱性 pH 值，使添加的磷酸以磷酸锂的形式沉淀。评估操作变量的影响，例如温度和电流密度，以优化沉淀过程。观察到一些关键发现：a) 磷酸锂沉淀的最佳条件为 25 °C 和 7.3 mA/cm ²，因为在这些操作条件下，在较短的时间段（15 分钟）内达到了化学平衡；b) 阳离子膜的效率和稳定性在 25 °C 时有利于提高；c) 可以浓缩氯化锂盐水溶液以沉淀磷酸锂，同时中和阴极部分的碱性 pH；d) 实验结果可以用基本热力学来解释。