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CN110615453A 一种直接制备电池级碳酸锂的方法 有权 转让

一种直接制备电池级碳酸锂的方法
摘要：
本发明提供一种直接制备电池级碳酸锂的方法，包括如下步骤：步骤1)：向含锂溶液中加入氢氧化钠溶液，使整个溶液的pH达到12以上，初步除去溶液中的杂质金属离子，过滤，得到第一精制锂液；步骤2)：向第一精制锂液中加入稀酸，调整pH值至小于或等于3，得第二精制锂液；步骤3)：向第二精制锂液中加入螯合剂，然后加入氢氧化钠溶液调节溶液pH至6-8，得第三精制锂液；步骤4)：向第三精制锂液中加入碳酸钠溶液，加热形成沉淀，将所得沉淀过滤、洗涤、干燥，得到电池级碳酸锂。本方法先用稀酸反调pH值，再用乙二胺二邻苯基乙酸钠络合金属杂质元素，然后用NaOH反调pH值，很好地去除了残余金属杂质元素，提高了碳酸锂纯度。
摘要（英）：

The invention provides a method for directly preparing battery-grade lithium carbonate, which comprises the following steps: 1) adding a sodium hydroxide solution into a lithium-containing solution tomake the pH value of the whole solution reach 12 or above, thus removing impurity metal ions in the solution, and filtering the solution to obtain a first refined lithium solution; 2) adding dilute acid into the first refined lithium solution, and adjusting the pH value to be less than or equal to 3 to obtain a second refined lithium solution; 3) adding a chelating agent into the second refined lithium solution, and then adding a sodium hydroxide solution to adjust the pH value of the solution to 6-8 to obtain a third refined lithium solution; and 4) adding a sodium carbonate solution into the third refined lithium solution, heating the third refined lithium solution to form a precipitate, and filtering the solution, and washing and drying the obtained precipitate to obtain the battery-grade lithium carbonate. According to the method, dilute acid is used for reversely adjusting the pH value, then EDDHA-Na is used for complexing metal impurity elements, then NaOH is used for reverselyadjusting the pH value, residual metal impurity elements are well removed, and the purity of lithium carbonate is improved.

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