(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 中天新興材料有限公司，南通 226010；
3. 廣東佳納能源科技有限公司，廣州 511495)
摘 要: 根據(jù)淀粉在稀酸或加熱條件下可水解為還原性單糖的性質(zhì)，以淀粉作為還原劑，采用酸浸出方法對從廢舊三元鋰離子電池正極材料中回收Li、Ni、Co、Mn的浸出工藝進(jìn)行研究；分別考察酸度、淀粉濃度、固液比、浸出溫度和浸出時間對4種有價金屬浸出率的影響。結(jié)果表明：在最佳條件即2 mol/L H2SO4、4 g/L 淀粉、固液比50 g/L、浸出溫度80 ℃、浸出時間120 min時，Li、Ni、Co、Mn的浸出率分別達(dá)到98.55%、97.6%、96.73%以及91.92%。此外，基于對數(shù)定律方程對浸出動力學(xué)參數(shù)進(jìn)行了擬合，表現(xiàn)出較好的線性相關(guān)度，計算得出Li、Ni、Co、Mn的表觀活化能分別為14.8、21.3、24以及26.4 kJ/mol。浸出渣的XRD譜和SEM像顯示其主要物相為C和MnO2。
關(guān)鍵字: 廢舊鋰離子電池；正極材料；有價金屬；酸浸出；淀粉；浸出動力學(xué)
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Zhongtian New Material Co., Ltd., Nantong 226010, China;
3. Guangdong Jiana Energy Technology Co., Ltd., Guangzhou 511495, China）
Abstract:Based on the properties that starch can be hydrolyzed into reduced monosaccharide under dilute acid or heating conditions, starch was used as a reducing agent by acid leaching method for recovering Li, Ni, Co, Mn from cathode materials of spent ternary lithium ion battery. The effects of acid concentration, starch concentration, solid to liquid ratio, leaching temperature and leaching time on the leaching rate of four valuable metals were investigated. The results show that the leaching rates of Li, Ni, Co and Mn reach 98.55%, 97.6%, 96.73% and 91.92%, respectively under the optimum conditions of 2 mol/L H2SO4, 4 g/L starch, solid-liquid ratio at 50 g/L, leaching temperature at 80 ℃ and leaching time at 120 min. In addition, a good linear correlation is shown by fitting the kinetic parameters of leaching based on the logarithmic law equation, and the apparent activation energies of Li, Ni, Co and Mn are 14.8 kJ/mol, 21.3 kJ/mol, 24 kJ/mol and 26.4 kJ/mol, respectively. The analysis results of XRD and SEM show that the main phases of the leaching residue was C and MnO2.
Key words: spent lithium ion battery; cathode material; valuable metal; acid leaching; starch; leaching kinetics
