首页|离子吸附型稀土矿硫酸镁浸取尾矿中钙、镁的淋出行为

离子吸附型稀土矿硫酸镁浸取尾矿中钙、镁的淋出行为

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研究采用去离子水、氯化钙溶液、石灰水淋洗剂淋洗,离子吸附型稀土矿硫酸镁浸取尾矿中镁、钙的淋出行为.结果表明,浸取尾矿中的镁主要以水溶态形式存在,这部分镁易被淋洗脱除.采用石灰水淋洗,淋洗剂中的绝大部分钙可被静电吸附在淋洗后尾矿中,同时浸取尾矿中的部分水溶态镁因Mg2+在黏土矿物上的反吸附作用而逐渐转化为交换态镁,这与淋洗后尾矿pH值的升高有关.采用石灰水淋洗,当液固比为0.80时,淋洗后尾矿中速效镁、钙含量分别为104.4～207.6和201.7～1426.3 mg/kg,满足植物的生长需求.该研究为离子吸附型稀土矿原地浸矿场的环境修复提供一种有潜力的解决方案.
Leaching behaviors of calcium and magnesium in ion-adsorption rare earth tailings with magnesium sulfate
The leaching behaviors of calcium and magnesium in the rare earth tailings leached with magnesium sulfate using deionized water, CaCl2 solution and lime water were investigated. Experimental data indicated that magnesium in the tailings was easy to be leached out since most of the magnesium was in the form of water-soluble phase. Most of calcium in the lime water was electrostatically adsorbed on the clay mineral of the tailings, and the water-soluble magnesium was also gradually converted into exchangeable phase because of back-adsorption of Mg2+ on the clay mineral with increasing the pH values. When the liquid-to-solid ratio was 0.80, the contents of readily-available magnesium and calcium were 104.4−207.6 and 201.7−1426.3 mg/kg, respectively, which could meet the requirements for plants. These results suggest a promising route for the environmental remediation of ion-adsorption rare earth ore after in-situ leaching.

ion-adsorption rare earth oremagnesium sulfateenvironmental remediationleaching behaviorslime water

范波、赵龙胜、冯宗玉、刘德鹏、尹伟强、龙志奇、黄小卫

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有研科技集团有限公司 稀土材料国家工程研究中心,北京 100088

北京有色金属研究总院,北京 100088

有研稀土新材料股份有限公司,北京 100088

离子吸附型稀土矿 硫酸镁 环境修复 淋出行为 石灰水

National Key Research and Development Program of ChinaMajor Research Plan of the National Natural Science Foundation of China

2018YFC180180391962211

2021

10.1016/S1003-6326(21)65495-X

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(1)
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