Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate by calcinations-alkaline leaching

被引：0
作者：
Yang, He [1 ]
Mao, Linqiang [1 ]
Xue, Xiangxin [1 ]
机构：
[1] School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning
来源：
Huagong Xuebao/CIESC Journal | 2014年 / 65卷 / 03期
关键词：
Calcination; Leaching; Recovery; Reduced vanadium-chromium precipitate;
D O I：
10.3969/j.issn.0438-1157.2014.03.026
中图分类号：
学科分类号：
摘要：
Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate were implemented by calcination followed by alkaline leaching. The reaction process during calcination and the factors, such as temperature, time and alkaline medium, affecting leaching vanadium were investigated. Cr(III) and V(IV) could form CrVO4, and then CrVO4 was decomposed into Cr2O3 and V2O5 during calcinations. The appropriate conditions for calcination were temperature of 950°C and time of 1.0-3.0 h. Under the same molarity conditions, NaOH was better than Na2CO3 for leaching V2O5. Increasing NaOH concentration and time was favorable for leaching of V2O5 while temperature had little effect on leaching of V2O5. When reduced vanadium-chromium precipitate was calcined for 1.5 h at 850°C and was treated for 1.5 h using 3 mol·L-1 NaOH, the content of Cr2O3 in the residue was more than 96%, and leaching rates of vanadium and chromium were 87.3% and less than 1%, respectively. Additionally, 97% of vanadium in the filtrate could be precipitated by acidic ammonium salt. © All Rights Reserved.
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页码：948 / 953
页数：5
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