(1. 中南大學(xué) 化學(xué)化工學(xué)院, 長(zhǎng)沙 410083；2. 中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室, 長(zhǎng)沙 410083)
摘 要: 提出一種新型的從廢舊鋰離子電池中分離回收鈷鎳錳的工藝。該工藝采用物理擦洗−稀酸攪拌浸出的方法分離集流體與活性物質(zhì)，采用H2SO4+H2O2為浸出劑對(duì)活性物質(zhì)進(jìn)行浸出，然后采用黃鈉鐵礬法去除浸出液中的鐵，再采用N902萃取分離銅，通過(guò)水解沉淀法除鋁，最后采用碳酸鹽共沉淀法制備鎳鈷錳碳酸鹽前軀體。結(jié)果表明：最優(yōu)浸出條件為液固比10:1、H2SO4濃度2.5 mol/L、H2O2加入量2.0 mL/g(粉料)、溫度85 ℃、浸出時(shí)間120 min；在此條件下，鈷、鎳和錳的浸出率分別達(dá)到97%、98%和96%；除去浸出液中的鐵、銅和鋁后，鈷、鎳和錳的損失率分別為1.5%、0.57%和4.56%；總體來(lái)說(shuō)，廢舊鋰離子電池中鈷、鎳和錳的回收率均可以達(dá)到95%。
關(guān)鍵字: 廢舊鋰離子電池；浸出；萃取；N902；回收
Co and Mn from spent lithium-ion batteries
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:A novel process was developed for the separation and recovery of nickel, cobalt and manganese from the lithium-ion secondary batteries. In this process, stirring-scrubbing and dilute acid leaching are used to separate the active materials from current collectors. The Fe3+ ion in the leach liquor was removed using sodium jarosite method, then the copper was extracted by N902, and the aluminum was selectively precipitated as aluminum hydroxide. Finally, the pure NixCoyMnz ternary system precursor was prepared using carbonate co-precipitation method. The results show that the optimum conditions include liquid/solid ratio of 10:1, H2SO4 concentration of 2.5 mol/ L, H2O2 addition of 2.0 mL/g(powder), leaching time of 120 min and leaching temperature of 85 ℃, under which the leaching rates of Ni, Co and Mn are 97%, 98% and 96%, respectively. After the removal of iron, copper and aluminum in the leach liquor, the loss rates of Ni, Co and Mn are 1.5%, 0.57% and 4.56%, respectively. Overall, 95% of Ni, Co and Mn can be recovered from the spent lithium-ion batteries.
Key words: spent lithium-ion batteries; leaching; extraction; N902; recovery
