Method for producing lithium compound
A technology of lithium compounds and mixtures, which is applied in the field of preparation of lithium compounds, can solve the problems of high phosphoric acid price and difficulty in converting lithium compounds, etc., and achieve the effects of improving recovery rate, ensuring economy, and reducing costs
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[0073] The preparation method of a lithium compound according to an exemplary embodiment of the present disclosure may include: a step of preparing lithium phosphate; a step of mixing the lithium phosphate and sulfuric acid to obtain a mixture; reacting the lithium phosphate in the mixture the step of converting to lithium sulfate; and the step of separating said lithium sulfate into a solid phase.
[0074] In particular, this embodiment is characterized in that the total concentration of phosphorus (P) and sulfur (S) in the mixture ([P+ S] mol / L) is more than 5 mol / L.
[0075] Regarding this, the present inventors have confirmed through experiments that lithium sulfate has a high solubility in water or low-concentration phosphoric acid, but the solubility rapidly decreases in a high-concentration phosphoric acid solution in which sulfate ions exist. That is to say, in the high-concentration phosphoric acid solution with sulfate ions, the lithium above the solubility is repla...
Embodiment 1
[0199] Under the conditions in Table 1 below, after allowing lithium phosphate to react with sulfuric acid, an experiment was carried out to recover a high-concentration phosphoric acid filtrate by solid-liquid separation, and the results are shown in Table 2.
[0200] As the lithium phosphate, lithium phosphate extracted from waste batteries was used. After drying the lithium phosphate at 105° C. for 24 hours, the weight change was measured, and the result showed that the water content was about 35%. The composition of the dried lithium phosphate was detected by ICP (Inductively Coupled Plasma), and the amount of sulfuric acid corresponding to 1 equivalent according to Reaction Formula 1 was calculated, and the purity of the sulfuric acid used was 95%.
[0201] The phosphoric acid that is used to make lithium phosphate slurry has used the phosphoric acid solution that concentration is 30~50% by weight, and described phosphoric acid solution is by phosphoric acid solution (Oi K...
Embodiment 2
[0210] Figure 6 is a flowchart according to Embodiment 2. Specifically, an ethanol washing step is included.
[0211] Under the conditions in Table 3 below, after allowing lithium phosphate to react with sulfuric acid, an experiment was carried out to recover a high-concentration phosphoric acid filtrate by solid-liquid separation. In addition, the component analysis of the washing water for washing and recovering lithium sulfate was also carried out, and the results are shown in Tables 4, 5 and 6.
[0212] Lithium phosphate was extracted from waste batteries. In order to reduce the experimental error caused by the difference in water content, it was used after drying at 105°C for 24 hours to remove the contained water. The composition of the dried lithium phosphate was detected by ICP (Inductively Coupled Plasma), and the amount of sulfuric acid corresponding to the equivalence ratio according to Reaction Formula 1 was calculated, and the purity of the sulfuric acid used w...
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