(1. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083；
2. 中南大學(xué) 有色金屬資源化學(xué)教育部重點實驗室，長沙 410083)
摘 要: 以生物質(zhì)燕麥秸稈粉為還原劑，在硫酸條件下酸浸回收廢舊鋰電池中的Co，并對其浸出過程進行動力學(xué)研究。結(jié)果表明：0~20 min酸浸Co的過程為反應(yīng)核收縮模型，表觀活化能為27.5 kJ/mol；30~150 min(低于80 ℃)Co的浸出過程也符合反應(yīng)核收縮模型，表觀活化能為28.32 kJ/mol，受擴散和化學(xué)反應(yīng)混合控制，其中又以化學(xué)反應(yīng)控制為主。在液固比為10 mL/g，單位質(zhì)量電池渣所用麥稈粉量0.7 g、硫酸濃度2 mol/L、溫度90 ℃、反應(yīng)時間2 h的條件下，電池粉中Co的浸出率達到99%以上。
關(guān)鍵字: 廢舊鋰電池；燕麥秸稈；還原酸浸動力學(xué)
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Resource Chemistry, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The oat straw biomass was used as reducing agent to leach cobalt from waste lithium-ion battery under the condition of sulfuric acid. The kinetics of the leaching process was researched. The results show that the leaching process fits the reacted shrinking core model within the first 20 min, the apparent activation energy is 27.5 kJ/mol. This conclusion also suits to the second stage (below 80 ℃), namely during 30-150 min, the apparent activation energy is 28.32 kJ/mol, and this process is controlled by diffusion and chemical reaction, in addition, the latter one is dominated. When the liquid-solid ratio is 10 mL/g, the amount of oat straw biomass is 0.7 g per gram battery powder, the concentration of H2SO4 is 2 mol/L, and the temperature is 90℃, reacting time is 2 h, the leaching rate of cobalt in the battery powder is more than 99%.
Key words: waste lithium battery; oat straw; reductive acid leaching kinetics
