Reduction leaching of rare earth from ion-adsorption type rare earths ore with ferrous sulfate

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• 作者：Yanfei XIAO (肖燕飞)^a ; ^b ; ^c ; Zongyu FENG (冯宗玉)^a ; ^b ; Guhua HU (胡谷华)^d ; Li HUANG (黄 莉)^a ; ^b ; ^c ; Xiaowei HUANG (黄小卫)^a ; ^b ; ^{hxw0129@126.com" class="auth_mail" title="E-mail the corresponding author} ; Yingying CHEN (陈迎迎)^e ; Zhiqi LONG (龙志奇)^a ; ^b
• 关键词：rare earth ; reduction leaching ; ferrous sulfate ; the ion-adsorption type rare earths ore
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：34
• 期：9
• 页码：917-923
• 全文大小：643 K

文摘

The practice of in-situ leaching of the ion-adsorption type rare earths ore with ammonium sulfate could only leach most of rare earth in ion-exchangeable phase, but not the colloidal sediment phase. Therefore, the reduction leaching of rare earth from the ion-adsorption type rare earths ore with ferrous sulfate was innovatively put forward. The soak leaching process and the column leaching process were investigated in the present study. It was determined that ion-exchangeable phase could be released, and part of colloidal sediment phase rare earth could be reduction leached by the cations with reduction properties. The mechanism of reduction leaching was discussed with the Eh-pH diagram of cerium. Moreover, the stronger reduction of reductive ions, the greater acidity of leaching agent solution, and the higher reductive ion concentration, could result in the higher rare earth efficiency and the bigger cerium partition in the leaching liquor. In the ferrous sulfate column leaching process, the rare earth leaching rate and the rare earth efficiency were a little higher than with (NH₄)₂SO₄ agent, and the rare earth efficiency and the partitioning of cerium in leaching liquor could be about 102% and 5.31%, respectively. However, the ferrous sulfate leaching process revealed some problems, so compound leaching with magnesium sulfate and a small amount of ferrous sulfate was proposed to an excellent alternative leaching agent for further studies, which may realize efficiency extraction and be environment-friendly.