Selective leaching of vanadium over iron from vanadium slag
Selective leaching of vanadium over iron from vanadium slag
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DOI：
10.1016/j.jhazmat.2019.01.060
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发表时间：
2019-04-15
影响因子：
13.6
通讯作者：
Xue, Xiangxin
中科院分区：
文献类型：
--
作者：
Zhang, Xuefei;Fang, Dean;Xue, Xiangxin
针对硫酸浸出钒(V)过程中铁(Fe)的浸出，提出了一种新的钒渣综合利用方法。在这一过程中，在VS中加入Cr2O3，使其与VS中的Fe偶联，生成不溶于SA的(Fe-x，Cr1-x)(2)O-3，从而降低了Fe的浸出率，避免了随后渗滤液中V的分离困难。研究了VS在焙烧和SA浸出过程中的物相变化，以及焙烧温度、焙烧时间和添加Cr2O_3对VS中V、Fe和铬(Cr)的溶出率的影响。当Cr2O_3的加入量为12wt.%时，渗滤液中V的质量浓度比Fe高一个数量级，V与Fe的质量比达到18.34。钒、铁、铬的相对标准偏差分别为91%、1.39%和0.28%。浸出渣可作为炼铁原料再利用。更重要的是，(Fe-x，Cr1-x)(2)O-3和Fe2TiO可以从浸出渣中分离出来，分别作为黑色陶瓷颜料和选矿技术生产二氧化钛的原料回收利用。
A new comprehensive utilization of vanadium slag (VS) method focusing on inhibiting leaching of iron (Fe) during the leaching of vanadium (V) using sulfuric acid (SA) was proposed. In this process, Cr2O3 was added to VS to conjugate with Fe in the VS to form (Fe-x,Cr1-x)(2)O-3 which is insoluble in SA, resulting in the decrease of leaching ratio (LR) of Fe to avoid the subsequent separation difficulty of V in leachate. The phase evolutions of VS during the roasting and SA leaching process, and the influences of roasting temperature, roasting time, and addition of Cr2O3 on the LR of V, Fe and chromium (Cr) from VS were studied. When the addition of Cr2O3 is 12 wt.%, the mass concentration of V in the leachate is 1 order magnitude higher than Fe and the mass ratio of V to Fe reaches 18.34. The LR of V, Fe and Cr are 91% 1.39% and 0.28%, respectively. The leaching residue can be reused as ironmaking raw material. More importantly, the (Fe-x,Cr1-x)(2)O-3 and Fe2TiOs can be separated from the leaching residue and recycled as raw materials for black ceramic pigments and titanium dioxide production by mineral processing technology, respectively.