摘要
用Na2S2O3作还原剂,在H2SO4介质中溶解锂离子电池中的L iCoO2,反应速率快、溶解完全、不产生污染,L iCoO2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、A l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L i^＋离子加Na2CO3处理,沉淀得L i2CO3,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。
The process of reducing and dissolving LiCoO2 in the lithium-ion battery by Na2 S2O3 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 A1 in the system were removed by precipitation at pH ≈5. Co（OH） 2 was obtained by precipitation at pH = 9. 5 - 10, it was then purified by reprecipitation. Co304 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 NazSO4 · 10H2O is recovered.
出处
《应用化学》
CAS
CSCD
北大核心
2006年第10期1182-1184,共3页
Chinese Journal of Applied Chemistry
基金
湖北省自然科学基金资助项目(2002AB074)
