(1. 華東師范大學(xué)生 態(tài)與環(huán)境科學(xué)學(xué)院，上海 200241；
2. 上海交通大學(xué) 環(huán)境科學(xué)與工程學(xué)院，上海 200240；
3. 崇明生態(tài)研究院，上海 200062)
摘 要: 廢舊三元電池正極活性材料中大部分固態(tài)粉末的金屬離子可以通過(guò)硫酸浸取劑轉(zhuǎn)移至酸溶液中。將富集在溶液中的金屬離子分離對(duì)廢舊三元電池中有價(jià)金屬的回收具有重大的意義。本文研究硫酸浸出液中鈷、鎳、錳、鋰的分離與回收。提出的沉淀工藝流程為草酸銨沉淀法沉淀鈷-碳酸氫銨沉淀法沉淀錳-碳酸鈉氫氧化鈉共沉淀法沉淀鎳-碳酸鈉沉淀法沉淀鋰。通過(guò)改變?nèi)芤簆H值、溫度、攪拌時(shí)間、沉淀劑用量等參數(shù)，優(yōu)化鈷鎳錳鋰的分離條件。結(jié)果表明：在優(yōu)化工藝條件下，溶液中的金屬離子分別以草酸鈷、碳酸錳、堿式碳酸鎳、碳酸鋰的形式沉淀，鈷錳鎳鋰回收率分別達(dá)到99.17%、97.88%、93.47%、85.21%，產(chǎn)物草酸鈷、碳酸錳、堿式碳酸鎳、碳酸鋰的質(zhì)量分?jǐn)?shù)分別為99.87%、98.89%、98.46%、96.52%。
關(guān)鍵字: 三元鋰電池；硫酸浸出液；鈷鎳錳鋰；沉淀分離
（1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
2. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
3. Institute of Eco-Chongming(IEC), Shanghai 200062, China）
Abstract:The metal ions of most solid powders in the cathode active materials of waste ternary batteries can be transferred to the acid solution by sulfuric acid leaching agent. In this work, the separation and recovery of cobalt, nickel, manganese and lithium in sulfuric acid leaching solution were studied. The proposed precipitation process was precipitated by ammonium oxalate precipitation method-precipitation of cobalt by ammonium bicarbonate precipitation method-precipitation of nickel by sodium hydroxide-sodium hydroxide coprecipitation method-precipitation of lithium by sodium carbonate. The separation conditions were optimized by changing the pH value, temperature, stirring time and amount of precipitant. The experimental results show that under the optimized process conditions, the metal ions in the solution are precipitated in the form of cobalt oxalate, manganese carbonate, basic nickel carbonate and lithium carbonate. The recovery rates of cobalt, manganese, nickel and lithium are 99.17%, 97.88%, 93.47% and 85.21%, respectively. The mass fractions of cobalt oxalate, manganese carbonate, basic nickel carbonate and lithium carbonate are 98.77%, 98.89%, 98.46% and 96.52%, respectively.
Key words: ternary lithium battery; sulfuric acid leaching solution; cobalt nickel manganese lithium; precipitation separation
