Integrated treatment of tailing material for the selective recovery of uranium, rare earth elements and heavy metals
Integrated treatment of tailing material for the selective recovery of uranium, rare earth elements and heavy metals
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DOI：
10.1016/j.mineng.2019.01.008
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发表时间：
2019-03
影响因子：
4.8
通讯作者：
M. Hamza;I. El-Aassy;E. Guibal
中科院分区：
文献类型：
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作者：
M. Hamza;I. El-Aassy;E. Guibal
加工过的矿石可能含有大量的残余有价值的金属。在西奈西南部开采含三水铝石页岩矿产生的采矿废物的情况下，残余物的特征表明存在可以增值的铀、稀土元素、铝和锌。在120 °C下用每吨矿石约200 kg H2SO 4的酸消耗进行泥料浸出，成功地浸出了94%以上的U（VI）和RE（除了大量的Al（III）和Zn（II））。一系列选择性沉淀步骤允许连续回收（几乎定量地）Zn（II）、Fe（III）和Al（III）。在第二步中，磁性树脂已用于通过吸附/解吸步骤富集浸提母液（接近19倍）。在该工艺的最后阶段，使用pH 1.5的25%（w/w）草酸盐溶液通过选择性沉淀回收稀土，而使用pH 9的氢氧化钠沉淀完全回收铀。对不同沉淀物进行的能量色散X射线分析显示纯度等级系统地优于93%，上级。
Processed ores may contain substantial amounts of residual valuable metals. In the case of the mining wastes issued from the exploitation of gibbsite bearing shale ore in the Southwestern Sinai, the characterization of the residue shows the presence of uranium, rare-earth elements (REEs), aluminum and zinc that can be valorized. Pug leaching at 120 °C with an acid consumption of about 200 kg H2SO4per ton of ore succeeded in leaching more than 94% of U(VI) and REEs (in addition to substantial amounts of Al(III) and Zn(II)). A series of selective precipitation steps allowed successively recovering (almost quantitatively) Zn(II), Fe(III) and Al(III). In a second step, a magnetic resin has been used for enriching the pregnant leaching solution (by a factor close to 19) through sorption/desorption steps. In the last stage of the process, REEs were recovered by selective precipitation using 25% (w/w) oxalate solution at pH 1.5, while uranium was fully recovered by precipitation with NaOH at pH 9. Energy dispersive X-ray analysis performed on the different precipitates showed purity grades systematically superior to 93%.