摘要
从钕铁硼废料中高效回收稀土是缓解稀土资源紧张局势的重要途径。目前,从钕铁硼废料中回收稀土的难点在于稀土与铁的深度分离。利用赤铁矿除铁法分离钕铁硼废料中的Fe,达到稀土与Fe深度分离的目的。针对影响稀土浸出率及稀土与铁分离效果的因素进行了详细的考察。结果表明:在氧化剂NaNO_(3)用量60 mg/g原料,HCl用量0.663 mL/g,浸出温度180℃,浸出时间3 h,液固比2.5 mL/g,搅拌速度300 r/min的条件下,REO和镨钕浸出率分别为95.91%、97.99%,酸浸液铁与稀土的浸出选择性s(Fe2O_(3)/REO)为4.37%。XRD及SEM结果显示酸浸渣主要成分为过滤性能良好的赤铁矿。
Efficient recovery of rare earths from spent NdFeB is a key way to alleviate the shortage of rare earth resources.At present,the difficulty in recovering rare earths from spent NdFeB is the deep separation of rare earths and iron.The purpose of deep separation of rare earth and Fe is achieved by removing the Fe from NdFeB hydrochloric acid leaching solution by hematite precipitation.The factors affecting the leaching rate of rare earth and the separation effect of rare earth and iron were investigated in detail.The results show that the leaching rate of REO and praseodymium-neodymium is 95.91%and 97.99%,respectively,and the leaching selectivity of iron and rare earth of acid leaching solution s(Fe2O3/REO)is 4.37%under the conditions including dosage of oxidant NaNO3 of 60 mg/g of raw material,dosage of HCl of 0.663 mL/g,leaching temperature of 180℃,leaching time of three hours,liquid solid ratio of 2.5 mL/g and stirring speed of 300 r/min.XRD and SEM results show that the main composition of the leaching residue is hematite with good filtration performance.
作者
吴金玲
阳启华
王日
张文娟
WU Jinling;YANG Qihua;WANG Ri;ZHANG Wenjuan(Liangshan Rare Earth Co.,Ltd.,China Rare Earth Group Co.,Ltd.,Liangshan 615000,Sichuan,China;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《有色金属(冶炼部分)》
北大核心
2025年第2期133-139,共7页
Nonferrous Metals(Extractive Metallurgy)
基金
中央高校基本科研业务费资助项目(FRF-TP-19-036A2)
中国博士后科学基金资助项目(2018T110045)。
关键词
钕铁硼废料
赤铁矿法
稀土
深度分离
spent NdFeB
hematite precipitation
rare earths
deep separation
