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

YANG He; MAO Linqiang; XUE Xiangxin

doi:10.3969/j.issn.0438-1157.2014.03.026

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

更新时间：2025-12-10

- Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate by calcinations-alkaline leaching
- CIESC Journal Issue 3, Pages: 948-953(2014)
- 作者机构：
  
  东北大学材料与冶金学院,辽宁,沈阳,110004
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.03.026
  CLC： F803.2+1
- Online First：05 March 2014，
  
  Published：05 March 2014
- 稿件说明：
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YANG He, MAO Linqiang, XUE Xiangxin. Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate by calcinations-alkaline leaching[J]. CIESC Journal, 2014, (3): 948-953.
DOI：

YANG He, MAO Linqiang, XUE Xiangxin. Separation and recovery of chromium and vanadium from reduced vanadium-chromium precipitate by calcinations-alkaline leaching[J]. CIESC Journal, 2014, (3): 948-953. DOI： 10.3969/j.issn.0438-1157.2014.03.026.

摘要

通过煅烧-碱浸法从钒铬还原渣中分离回收钒铬，考察了煅烧反应过程并探讨了煅烧-碱浸条件对浸出钒的影响。结果表明：煅烧过程中Cr（Ⅲ）和V（Ⅳ）反应生成中间产物CrVO4，随后CrVO4分解为Cr2O3和V2O5；相同浓度条件下，在V2O5浸出效果方面NaOH要优于Na2CO3，提高浸出介质浓度和延长浸出时间有利于V2O5的浸出，而浸出温度对V2O5浸出无明显影响，钒铬还原渣在850℃煅烧1.5 h后经3 mol·L-1 NaOH在90℃浸出1.5 h，滤渣中的Cr2O3质量分数高于96%，钒、铬的浸出率分别为87.3%和小于1%，另外，利用酸性铵盐法能够沉淀滤液中97%的钒。

Abstract

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℃ 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℃ 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.

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