摘要
以废旧磷酸铁锂电池正极粉提锂后的磷铁尾渣为原料,以硫酸为浸出剂,选择性浸出去除杂质。结果表明,在硫酸浓度0.32 mol/L、液固比5 mL/g、浸出温度80℃、浸出时间2 h条件下,通过4级循环浸出,杂质元素铜、锰、铝、钙、钠、镁总浸出率分别达到70.81%、68.33%、65.57%、68.03%、67.85%、64.28%,磷、铁总浸出率分别为2.52%、2.24%,磷铁尾渣中的主要杂质元素被有效浸出,磷、铁元素则保留下来以进行后续资源利用。
For phosphorus-iron waste left after lithium extraction from cathode powder of spent lithium iron phosphate(LFP)batteries,a selective leaching with sulfuric acid was adopted to remove impurities therein.The results indicate that after a 4-stage leaching at 80℃for 2 h,with a sulfuric acid at a concentration of 0.32 mol/L and a liquid-to-solid ratio of 5 mL/g,the total leaching rates of elemental impurities,including Cu,Mn,Al,Ca,Na and Mg reach 70.81%,68.33%,65.57%,68.03%,67.85%and 64.28%,respectively,and the total leaching rates of P and Fe are only 2.52%and 2.24%,respectively.It is concluded that the main elemental impurities can be effectively leached out from such phosphorus-iron waste,with elements of P and Fe left for subsequent resource utilization.
作者
宋传京
雷炳宏
杨文博
孙大力
SONG Chuanjing;LEI Binghong;YANG Wenbo;SUN Dali(Shenzhen Stariver Environmental Co.,Ltd.,Shenzhen 440303,Guangdong,China)
出处
《矿冶工程》
北大核心
2025年第5期198-201,共4页
Mining and Metallurgical Engineering
关键词
废旧磷酸铁锂电池
磷铁尾渣
选择性浸出
杂质元素
除杂
spent lithium iron phosphate battery
phosphorus-iron waste
selective leaching
elemental impurity
impurity removal
