引用本文:
郭丽萍, 杜小弟, 方伟, 雷家珩. Na2S2O3还原溶解LiCoO2及钴、锂分离回收[J]. 应用化学,
2006, 23(10): 1182-1184.
Citation: GUO Li-Ping, DU Xiao-Di, FANG Wei, LEI Jia-Heng. Reduction and Dissolution of LiCoO2 by Na2S2O3 and Separation and Recovery of Li and Co[J]. Chinese Journal of Applied Chemistry, 2006, 23(10): 1182-1184.
Citation: GUO Li-Ping, DU Xiao-Di, FANG Wei, LEI Jia-Heng. Reduction and Dissolution of LiCoO2 by Na2S2O3 and Separation and Recovery of Li and Co[J]. Chinese Journal of Applied Chemistry, 2006, 23(10): 1182-1184.
Na2S2O3还原溶解LiCoO2及钴、锂分离回收
摘要:
用Na2S2O3作还原剂,在H2SO4介质中溶解锂离子电池中的LiCoO2,反应速率快、溶解完全、不产生污染,LiCoO2的溶解率达99.5%。其最佳反应条件为:H+离子浓度3.5 mol/L,Na2S2O3浓度0.25 mol/L,反应温度为90℃,反应时间为2.3 h。体系中的Fe、Al杂质在pH≈5时沉淀除去;Co(OH)2在pH为9.5~10沉淀得到,经酸溶解后二次沉淀提纯,500℃煅烧2.0 h得Co3O4,其纯度达到99.3%,钴的回收率达97%。母液中Li+离子加Na2CO3处理,沉淀得Li2CO3,其纯度达97.8%,锂的一次回收率达73%,母液经冷却至10℃以下除去Na2SO4·10H2O后可循环使用。
English
Reduction and Dissolution of LiCoO2 by Na2S2O3 and Separation and Recovery of Li and Co
Abstract:
The process of reducing and dissolving LiCoO2 in the lithium-ion battery by Na2S2O3 in the presence of H2SO4 was studied.It had high reaction rate and LiCoO2 dissolved completely with no contamination.The solubility rate of LiCoO2 was 99.5%.The optimal process conditions are that the concentration of H+ is 3.5 mol/L,the concentration of Na2S2O3 is 0.25 mol/L,reaction temperature is 90℃,reaction time is 2.3 h.Fe and Al in the system were removed by precipitation at pH≈5.Co(OH)2 was obtained by preci-pitation at pH=9.5~10,it was then purified by reprecipitation.Co3O4 was obtained by calcining Co(OH)2 at 500℃ for 2 h,the purity of which was 99.3%.The recovery rate of Co was 97%.Li2CO3 was obtained by adding Na2CO3 to the mother liquor,the purity of which was 97.8%.The one-time recovery for Li was 73%.The mother liquor can be reused after being cooled to below 10℃ and Na2SO4·10H2O is recovered.
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