磷酸铁锂废粉硫酸氢钠焙烧回收工艺研究

doi:10.19964/j.issn.1006-4990.2022-0314

Abstract

Abstract:

With the rapid growth of the production and sales of lithium iron phosphate battery new energy vehicles，how to effectively recycle the waste lithium iron phosphate power batteries and realize the resource utilization of their valuable metals has become a research hotspot.The process of sodium salt assisted roasting of lithium iron phosphate waste powder and water leaching to recover lithium salt was proposed.In oxygen atmosphere，lithium iron phosphate waste powder was reacted with NaHSO₄·H₂O to produce LiNaSO₄，FePO₄ and Fe₂O₃，and then Li₃PO₄ with a purity of 99.58% and FePO₄ with a purity of 99.6% were obtained through selective leaching，separation and precipitation.The process conditions such as the mass ratio of NaHSO₄·H₂O to waste LFP（lithium iron phosphate），the oxidative roasting temperature，the roasting holding time and the water immersion time of roasted products were studied.The results showed that the mass ratio of NaHSO₄·H₂O to waste LFP powder was 1.6，oxidative roasting at 600℃ for 60 min，and the roasted product was immersed in water for 70 min at room temperature，which were the best recovery process parameters，and the lithium ion leaching rate was 98.7%.In this process，the selective recovery of valuable metals was realized under mild conditions，which was helpful for the resource utilization of waste lithium iron phosphate batteries.

Key words: waste lithium iron phosphate powder, sodium bisulfate, roasting, recovery, lithium phosphate

CLC Number:

X705

CHEN Yujue, ZHANG Liangjun, KUANG Huan, JIANG Manwen, XIAO Li. Study on roasting and recovery process of waste lithium iron phosphate powder with sodium bisulfate[J]. Inorganic Chemicals Industry, 2023, 55(3): 113-117.

Figures/Tables 9

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样品	各元素质量分数/%
样品	Li	Al	Fe	Cu	P	C	F
LFP废粉	3.47	12.37	26.71	0.12	14.58	4.87	0.29

样品	各元素质量分数/%
样品	Fe	Al	Cu	P	F
水浸渣	43.061 5	0.104 4	0.154 1	15.622 1	0.301 5

样品	主要成分质量分数/%
样品	Li₃PO₄	Al	Fe	Na	SO₄^2-	Cu
磷酸锂产品	99.58	0.008 8	0.006	0.13	0.20	0.000 1

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Study on roasting and recovery process of waste lithium iron phosphate powder with sodium bisulfate

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