Method for separating and recovering vanadium and chromium from vanadium-chromium reduced waste residue

A technology for separation, recovery and waste residue, applied in the direction of improving process efficiency, can solve problems such as long process flow, low vanadium-chromium separation efficiency, affecting industrial production, etc., and achieve the effect of being beneficial to industrial production and simple process flow

Active Publication Date: 2012-01-25
INST OF PROCESS ENG CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The methods of the above-mentioned prior art all implement the separation of vanadium and chromium from the solution. Although they have a certain effect, the common defect they face is that the separation efficiency of vanadium and chromium is low and the flow process is too long, thus affecting its industrial production.

Method used

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  • Method for separating and recovering vanadium and chromium from vanadium-chromium reduced waste residue

Examples

Experimental program
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Effect test

Embodiment 1

[0039] With 1000g vanadium chromium reduction waste residue (dry basis, SO 42- content of 24%, V content of 3.8%, and Cr content of 12%), the three-stage countercurrent washing method is used to wash and filter under the condition that the liquid-solid ratio is 1:1, to obtain filter cake (I) and washing liquid, and vanadium after washing In the chromium reduction waste residue, the sulfate radical concentration is reduced to 1.0%; the filter cake (I) and the concentration are 5% NaOH liquid at a liquid-solid ratio of 10: 1, the oxidizing agent is sodium peroxide, and the temperature is reacted for 6h under the condition of 20°C , The vanadium leaching rate is 98%, and the chromium leaching rate is less than 0.5%. After the leaching, the slurry is separated by filtration to obtain the filter cake (II) and the leachate, the filter cake (II) is washed to obtain the filter cake (III), the washing liquid of the filter cake (II) is evaporated and concentrated, and then combined with...

Embodiment 2

[0041] With 1000g vanadium chromium reduction waste residue (dry basis, SO 4 2- content of 24%, V content of 3.8%, and Cr content of 12%), the three-stage countercurrent washing method is used to wash and filter under the condition that the liquid-solid ratio is 4:1, to obtain filter cake (I) and washing liquid, and vanadium after washing In the chromium reduction waste residue, the sulfate radical concentration is reduced to 0.4%; the filter cake (I) and the concentration are 30% NaOH liquid at a liquid-solid ratio of 5: 1, the oxidant is oxygen, and the temperature is reacted for 3h under the condition of 70°C, and the vanadium The leaching rate is 98.5%, and the chromium leaching rate is less than 0.5%. After the leaching, the slurry is separated by filtration to obtain the filter cake (II) and the leachate, the filter cake (II) is washed to obtain the filter cake (III), the washing liquid of the filter cake (II) is evaporated and concentrated, and then combined with the l...

Embodiment 3

[0043] With 1000g vanadium chromium reduction waste residue (dry basis, SO 4 2- Content 24%, V content 3.8%, Cr content 12%) adopt the method for three-stage countercurrent washing to wash and filter under the condition that liquid-solid ratio is 8: 1, obtain filter cake (I) and washing liquid, vanadium after washing In the chromium reduction waste residue, the sulfate radical concentration is reduced to 0.05%; the filter cake (I) and the concentration are 50% NaOH liquid at a liquid-solid ratio of 2: 1, the oxidizing agent is air, and the temperature is reacted for 0.5h under the condition of 90° C. The vanadium leaching rate is 99.5%, and the chromium leaching rate is less than 0.8%. After the leaching, the slurry is separated by filtration to obtain the filter cake (II) and the leachate, the filter cake (II) is washed to obtain the filter cake (III), the washing liquid of the filter cake (II) is evaporated and concentrated, and then combined with the leachate and cooled C...

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Abstract

The invention relates to a method for separating and recovering vanadium and chromium from vanadium-chromium reduced waste residue. The method comprises the following main steps of: after removing water-soluble salts through slurrying and washing, extracting vanadium from the rest vanadium-chromium reduced waste residue by oxidizing in an alkaline solution; meanwhile, realizing the vanadium-chromium separation; cooling and crystallizing a leaching solution to obtain obtaining a sodium orthovanadate product; carrying out acid leaching on the vanadium-chromium reduced waste residue subjected to vanadium extraction; and preparing a basic chromium sulfate product after removing impurities, evaporating and crystallizing. According to the invention, the purity of the sodium orthovanadate product prepared by the method is higher than 93%, the content of Cr2O3 in the basic chromium sulfate can reach 24%, the content of Fe is lower than 0.1%, and the requirements on the basic chromium sulfate I type product in the HG / T 2678-2007 are met.

Description

technical field [0001] The invention relates to a hydrometallurgy or solid waste treatment method, in particular to a method for separating and recovering vanadium and chromium from vanadium-chromium reduction waste residue. Background technique [0002] Vanadium and chromium are important strategic resources, widely used in national defense, metallurgy, materials and chemical industries. However, during the production and utilization of vanadium and chromium, it is inevitable to produce pentavalent vanadium and hexavalent chromium. As we all know, pentavalent vanadium and hexavalent chromium are heavy metals, and their compounds are highly toxic, seriously endangering the environment and causing great damage to the human body. [0003] For example, in August 2011, Yunnan Qujing Luliang Chemical Industry Co., Ltd. illegally dumped and stored more than 5,000 tons of industrial waste chromium slag, resulting in water pollution. After media reports, it caused a huge sensation ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B34/32C22B34/22C22B3/12
CPCY02P10/20
Inventor 张洋徐红彬张懿杨立但建杨金成洪俊辉李千文王念卫张小飞裴丽丽庆朋辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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