Preliminary separation process of vanadium and chromium in acid leaching solution of vanadium chromium reduction slag

被引：0

作者：

Deng X. ^{[1
]}

Wei L. ^{[1
]}

Shen C. ^{[2
]}

Li Q. ^{[1
]}

Wang C. ^{[1
]}

Fan B. ^{[3
]}

Zhang H. ^{[2
]}

Zhang Y. ^{[3
]}

机构：

[1] Pangang Group Vanadium and Titanium Resources Company Limited, Panzhihua

[2] Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou

[3] Institute of Process Engineering, Chinese Academy of Sciences, Beijing

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2021年 / 40卷 / 07期

关键词：

Chromium loss rate; Precipitation of vanadium by oxidation; Separation of vanadium and chromium; Vanadium chromium reduction slag; Vanadium precipitation rate;

D O I：

10.16085/j.issn.1000-6613.2020-1711

中图分类号：

学科分类号：

摘要：

Vanadium chromium reduction slag is a typical hazardous solid waste, which produced from vanadium extraction by sodium roasting, and its resource-oriented utilization is in urgent need. A technical route of separation of vanadium and chromium from vanadium and chromium reduction slag have been proposed by Institute of Process Engineering, Chinese Academy of Sciences via sulfuric acid hydrolysis-preliminary separation of vanadium and chromium-depth separation of chromium/vanadium/iron by complexation, and a 10000-tons demonstration project was built in Pangang Group. The primary principle and process of vanadium/chromium separation in the acidolysis solution of vanadium chromium reduction slag was mainly investigated in this paper. The effect of H2O2 and Na2S2O8 on vanadium precipitation was studied, the optimal conditions were determined by experiments. The results showed that when H2O2 was used as oxidant, the n(H2O2)/n(V) was 0.75, the oxidation temperature was 60℃, the initial pH of the solution was 2.0, the oxidation time was 60min, the hydrolysis temperature was 95℃, and the hydrolysis time was 2.5h, the precipitation rate of vanadium reached 84.2%. Meanwhile, when Na2S2O8 was used as oxidant, the n(Na2S2O8)/n(V) was 0.65, the oxidation temperature was 90℃, the oxidation time was 45min, the initial pH of vanadium precipitation was 2.5, the vanadium precipitation temperature was 90℃, and the vanadium precipitation time was 2.5h, the precipitation rate of vanadium reached 93.1%. The results showed that sodium persulfate was more suitable for industrial application due to its mild oxidation process, high vanadium precipitation rate and small chromium loss. The microstructure of precipitated product was obtained by SEM. The V2O5 product that obtained after calcination was determined to be orthorhombic by X-ray diffraction. © 2021, Chemical Industry Press Co., Ltd. All right reserved.

引用

页码：4100 / 4107

页数：7

共 14 条

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