低浓度含锂废液生产磷酸锂的工艺研究

doi:10.11962/1006-4990.2019-0376

Abstract

Abstract:

Lithium was recovered from low-lithium and high-salt solution by phosphoric acid precipitation method.The effects of pH,temperature and phosphate concentration on lithium recovery rate and product impurity removal were studied.The re-sults showed that for high-salt and low-lithium solutions,the reaction temperature was 90 ℃,the mass fraction of 80% of phosphoric acid was 1.1 times the reaction amount and the pH of the solution before the reaction was at 7.5~8,then the recovery rate of lithium was 96.82%, and the product quality met the industry standards requirements.The method has the advantages of high conversion rate,full utilization of lithium resources,simple process,easy to operate and easy to industrialize.It is providing a certain theoretical guidance for the recovery of lithium in low-concentration lithium-containing solutions.

Key words: phosphoric acid, lithium-containing solution, battery recovery, lithium phosphate

CLC Number:

TQ131.11

Zhang Xiaoxia. Study on process of producing lithium phosphate by low-concentration lithium-containing waste liquid[J]. Inorganic Chemicals Industry, 2020, 52(5): 68-70.

ρ（Li）	ρ（Na）	ρ（Fe）	ρ（Mg）	ρ（Ca）
3.18	40.0	0.570	0.512	0.553
ρ（Cu）	ρ（Ni）	ρ（Pb）	ρ（Cl）	ρ（SO₄^2-）
0.848	0.075	0.011	0.032	112

项目		主含量（质量分数）	杂质含量
项目		主含量（质量分数）	w（Ca）	w（Mg）	w（Fe）	w（Cu）	w（Pb）	w（Ni）	w（Cl）
YS/T637—2007	FCLi₃PO₄-1	≥99.9	≤0.002 0	≤0.001	≤0.000 5	≤0.000 1	≤0.000 1	≤0.000 1	≤0.08
	FCLi₃PO₄-2	≥98.0	≤0.002 0	≤0.001	≤0.000 5	≤0.000 1	≤0.000 1	≤0.000 1	≤0.10
	FCLi₃PO₄-3	≥95.0	≤0.003 5	≤0.002	≤0.001 0	≤0.000 1	≤0.000 1	≤0.000 1	≤0.50
实验产品		99.92	0.002 0	0.001	0.000 5	0.000 1	0.000 1	0.000 1	0.05

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Study on process of producing lithium phosphate by low-concentration lithium-containing waste liquid

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