Method for extracting vanadium and chromium from vanadium chromate mixed solution

A technology of mixed solution and vanadium chromate, which is applied in the field of chemical metallurgy, can solve the problems of low efficiency of vanadium and chromium separation and recovery, complex process, high processing cost, etc., to avoid dangerous solid waste and ammonia nitrogen wastewater, high metal recovery rate, The effect of reducing processing costs

Inactive Publication Date: 2017-06-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Quaternary amine or primary-secondary compound amine extraction method can realize the separation of vanadium and chromium in the solution, but the cost of extraction and separation of vanadium and chromium is high, and the process conditions are difficult to control
Chinese patent CN101538652B uses macroporous strong basic resin D201 to separate vanadium and chromium in the green mud leach solution, but the separation of vanadium and chromium is not complete
The whole process requires both oxidative vanadium-containing chromate solution and reductive vanadium-containing chromate solution. The process is long and the operation is complicated, and only qualified products of vanadium can be recovered, and chromium is still obtained in the form of chromium slag. Form recovery, the efficiency of separation and recovery of vanadium and chromium is low
Chinese patent ZL 201210160816.1 uses weak base and strong base anion exchange resins for the difference in anion exchange potential formed by hexavalent chromium and pentavalent vanadium in aqueous solution, realizes the separation of vanadium and chromium through saturated adsorption, and directly obtains the products of vanadium and chromium, But the process is complicated, and the aqueous solution containing hexavalent chromium and pentavalent vanadium will cause great damage to the resin, seriously affecting the service life of the resin
It can be seen that the current process not only cannot take into account the vanadium and chromium in the solution at the same time, but also has defects such as long process route, large reagent consumption, high processing cost, and large environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 1.5m of vanadium extraction purification solution containing V 45.8g / L and Cr 2.7g / L with pH 8.3 3, Freeze and crystallize at -5°C for 3.5 hours, filter to obtain sodium vanadate crystals and its crystallization mother liquor; the sodium vanadate crystals are dried and dehydrated and sold as products, and the crystallization mother liquor is added to oxidize according to twice the theoretical amount of calcium vanadate precipitation formed by the residual vanadium in it Calcium, ball milled at room temperature for 2 hours, filtered to obtain vanadium removal slag and vanadium removal solution; vanadium removal slag was stirred and added to dilute sulfuric acid, and the pH of the solution was controlled to be 3.5-4.5 to leach vanadium, and the vanadium removal solution was acidified with sulfuric acid to pH 3.6. Then add copper sulfate crystals by stirring 1.5 times of the theoretical amount of copper chromate formed by the chromium therein, after the copper sulfate ...

Embodiment 2

[0033] Take 5000ml of leaching solution obtained from vanadium-chromium reduction slag containing V 13.8g / L and Cr 29.6g / L with pH 11.5, sodium roasting-water immersion, after purification and impurity removal, stir and add sulfuric acid to acidify to pH 1.8, and hydrolyze at 98°C Precipitate vanadium for 2 hours, filter to obtain red vanadium filter cake and liquid after vanadium precipitation; red vanadium filter cake is added to 150g / L ammonium sulfate solution at a liquid-solid ratio of 3:1, adjust the pH to 2.0 with sulfuric acid, and stir at 50°C for 1.5h Wash and remove the sodium, and the red cake after removing the sodium is calcined at 580°C for 3 hours to obtain vanadium pentoxide with a purity of 99.26%. Add sodium hydroxide to adjust the pH to 3.8, and filter to obtain the vanadium-removing slag and the solution after vanadium removal; the vanadium-removing slag is washed with sodium roasting water immersion solution to recover the vanadium in it, and the vanadium-...

Embodiment 3

[0035] Take 1.5m of vanadium extraction solution containing V 25.7g / L and Cr 7.8g / L with pH 9.1 3 , add calcium hydroxide according to 1.3 times of the stoichiometric number of vanadium forming calcium vanadate, stir and ball mill at room temperature for 1.5h, filter to obtain vanadium-precipitated liquid containing V0.03g / L and vanadium-enriched slag containing Cr﹤0.05% . The obtained vanadium-enriched slag was added with water at a solid-to-liquid ratio of 1:3g / ml, and 2mol / L H 2 SO 4 , react at 70°C for 1.5h, control the end point pH value to 3.2, and filter to obtain a vanadium-enriched solution, add ammonium to precipitate vanadium at a mass ratio of ammonium sulfate / vanadium pentoxide to the obtained vanadium-enriched solution, and add sulfuric acid to adjust the pH to 2.0, stirred at 95°C for 1.5h, filtered ammonium polyvanadate, and calcined at 600°C for 1.5h to obtain a vanadium pentoxide product with a purity of 98.6%. After the vanadium precipitation, the liquid ...

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Abstract

The invention relates to a method for extracting vanadium and chromium from a vanadium chromate mixed solution. The method has the characteristics that the vanadium in the vanadium chromate mixed solution is separated and recycled through the crystallization precipitation method or the hydrolysis precipitation method or the calcium salt precipitation method at first, then the chromium in the enrichment solution is separated through the copper salt precipitation method or the barium salt precipitation method, an obtained chromium precipitation enrichment product is then transformed into chromium enrichment liquid, the chromium enrichment liquid is further processed into products of chromic acid and chromate, and production of vanadium-chromium reducing slag and ammonia-nitrogen wastewater in the separation and recycling process of the vanadium and the chromium in the solution is effectively avoided. The method for extracting the vanadium and the chromium from the vanadium chromate mixed solution has the advantages of being good in vanadium and chromium separation effect, short in technological process, high in metal recycling rate, easy and convenient to operate, low in production cost, environmentally friendly and the like and is suitable for industrial production and application.

Description

technical field [0001] The invention relates to a method for extracting vanadium chromium from a vanadium chromate mixed solution, belonging to the field of chemical metallurgy. Background technique [0002] Vanadium and chromium are similar in nature, and they usually coexist in minerals. Therefore, the separation of vanadium and chromium is a problem that must be solved in the process of vanadium-chromium metallurgy and chemical industry. The aqueous solution of vanadium and chromium has similar properties, and it is a worldwide problem to separate vanadium and chromium in the solution. Many methods have been developed to separate and recover vanadium and chromium from mixed solutions containing vanadium and chromium, but they are all unsatisfactory in use, including solvent extraction, ion exchange and ammonium salt precipitation. Quaternary amine or primary-secondary compound amine extraction method can realize the separation of vanadium and chromium in the solution, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B34/32
CPCC22B34/22C22B34/32Y02P10/20
Inventor 王学文王明玉孟钰麒
Owner CENT SOUTH UNIV
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