Leaching ion adsorption rare earth by aluminum sulfate for increasing efficiency and lowering the environmental impact
Leaching ion adsorption rare earth by aluminum sulfate for increasing efficiency and lowering the environmental impact
复制标题
通过硫酸铝浸出离子吸附稀土以提高效率并降低对环境的影响
DOI：
10.1016/j.jre.2018.08.012
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发表时间：
2019-04
影响因子：
4.9
通讯作者：
Li Yongxiu
中科院分区：
文献类型：
--
作者：
Yang Lifen;Li Cuicui;Wang Dashan;Li Fengyang;Liu Yanzhu;Zhou Xuezhen;Liu Mingbiao;Wang Xiufeng;Li Yongxiu
采用柱浸法比较测定了铵、镁、铝的硫酸盐和氯化物对离子吸附稀土（IARE）的浸出效率（LE）。研究发现，在同等当量阳离子浓度下，硫酸铝IARE的LE最高，尾矿中粘土矿物颗粒的Zeta电位接近于零，滑坡和污染物排放的风险较低。此外，确定硫酸铝的最佳浓度为0.02 mol/L，远低于硫酸铵和硫酸镁的最佳浓度。为了降低生产成本和环境影响，我们提出了多级浸出工艺，先用硫酸铵浸出，然后用硫酸铝浸出，然后进行水洗和石灰中和。当硫酸铵与硫酸铝的比例从1:0变化到0.5:0.5时，尾矿中残留铵从11.2%下降到0.6%，而稀土的LE在0.8:0.2时表现出最佳值。用石灰水将尾矿的pH中和至6以上，水洗液中的离子浓度即可满足排水要求。同时，粘土颗粒的zeta电位在-5 mV左右，意味着滑坡的风险相对较低。这些事实表明，用硫酸铝代替硫酸铵作为浸出剂，可以提高IARE的LE，减少尾矿滑坡和污染物排放造成的危险。
The leaching efficiency (LE) of ion adsorption rare earth (IARE) by the sulfate and chloride of ammonium, magnesium and aluminum were comparatively determined using column leaching method. It is found that at equal equivalent concentration of cation, the LE of IARE by aluminum sulfate is the highest, and the zeta potential of clay mineral particles in the tailing is near to zero, which means a lower risk of landslide and pollutant emission. Furthermore, the optimum concentration of aluminum sulfate is determined to be 0.02 mol/L, which is much lower than that of ammonium sulfate and magnesium sulfate. To reduce the production cost and environmental impact, we proposed a multi-stage leaching process, which was firstly leaching with ammonium sulfate and then with aluminum sulfate, following by water washing and lime neutralizing. With the ratio of ammonium sulfate to aluminum sulfate varying from 1:0 to 0.5:0.5, the residual ammonium in tailing decreases from 11.2 %to 0.6%, however, the LE of RE shows an optimum value at 0.8:0.2. By neutralizing the pH of tailing with lime water to over 6, the ion concentration in water rinsing solution can meet the requirement for water discharge. At the same time, the zeta potential of clay particles is found to be around -5 mV, means a relatively lower risk of landslide. These facts indicate that the LE of IARE can be increased and the danger caused by tailings landslides and pollutant emissions can be reduced by replacing ammonium sulfate with aluminum sulfate as leaching reagent.
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DOI：
10.1016/s1003-6326(17)60185-7
发表时间：
2017-07-01
影响因子：
4.5
作者：
Jing, Qing-xiu;Chai, Li-yuan;Wang, Wei
通讯作者：
Wang, Wei
影响因子：
4.9
作者：
Xiao Yanfei;Liu Xiangsheng;Wu Wenyuan
通讯作者：
Wu Wenyuan
DOI：
--
发表时间：
2003
期刊：
Rare Metals and Cemented Carbides
影响因子：
--
作者：
Yao Hui-qin
通讯作者：
Yao Hui-qin
影响因子：
8.6
作者：
Xiuli Yang;T. Qiu
通讯作者：
Xiuli Yang;T. Qiu
DOI：
10.1016/s1003-6326(14)63435-x
发表时间：
2014-09
影响因子：
4.5
作者：
T. Qiu;Xihui Fang;Hongjing Wu;Qinghua Zeng;Dongmei Zhu
通讯作者：
T. Qiu;Xihui Fang;Hongjing Wu;Qinghua Zeng;Dongmei Zhu