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A method for separating and recovering chromium from vanadium-containing chromate solution

A vanadium-containing chromate, separation and recovery technology, applied in the field of chemical metallurgy, can solve problems such as difficult implementation, complicated process, and large resin damage, and achieve the effects of reducing production costs, high metal recovery rate, and low production costs

Active Publication Date: 2020-02-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 ZL201210160816.1 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
Therefore, this method is difficult to implement in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 1.5m of vanadium slag clinker water immersion solution containing V 25.3g / L and Cr 3.1g / L with a pH of 8.3 3 , add calcium oxide according to 1.3 times the stoichiometric number of vanadium forming calcium vanadate, stir and ball mill at room temperature for 2 hours, filter to obtain vanadium-precipitated liquid containing V 0.03g / L and vanadium-enriched slag containing Cr﹤0.05%. The vanadium-enriched slag is used as the raw material for the production of vanadium pentoxide, and the obtained vanadium is deposited and then liquid passes through CO 2 After adjusting the pH to 7.5, add lead carbonate according to 1.2 times of the theoretical amount of lead chromate formed by chromium, stir and ball mill at room temperature for 1.5 hours, filter the chromium-precipitated solution and chromium-enriched slag, and obtain the chromium-precipitated solution after cyclic electrodialysis , to obtain concentrated water (concentrated solution) with a conductivity of 57800 μS / cm...

Embodiment 2

[0032] Take pH 1.8 containing V 1.1g / L, Cr 2.8g / L after hydrolysis vanadium precipitation 1.5m 3, according to wherein vanadium forms ferric vanadate stoichiometric number 3 times and stirs and adds ferric sulfate, adds sodium carbonate and adjusts pH to 7.5, filters and removes wherein V after 90 ℃ of reaction 2h, then the lead sulfate that embodiment 1 obtains is added into The filtrate was stirred and ball-milled at room temperature for 2.5 hours, and the chromium-precipitated liquid and chromium-enriched residue were obtained by filtration. The chromium-precipitated liquid is crystallized at 0°C to precipitate Glauber’s salt, and then returns to the vanadium slag clinker leaching process to continue to use. The chromium-enriched slag is stirred into the sulfuric acid-sodium sulfate solution at a solid-to-liquid ratio of 1:2g / ml, and the pH value of the solution is maintained at 85°C. 2 to 3, until the precipitate is completely converted into white, filter to obtain lead su...

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Abstract

The invention relates to a method for separating and recycling chromium from a vanadium contained chromate solution. The method is characterized in that after vanadium in the vanadium contained chromate solution is separated, a lead-contained compound is added for serving as a precipitation enrichment reagent of chrome, the chrome is subject to precipitation enrichment in a manner of lead chromate, and after filter, chrome precipitation after liquid and chrome enrichment slag are obtained, the chrome enrichment slag is leached through sulfuric acid and / or sulfate solution, after filtering, chromium enrichment liquid and lead sulfate are obtained, the obtained lead sulfate directly returns back to be used as the precipitation enrichment reagent of chrome, or through transformation, the leadsulfate returns back to be used as the precipitation enrichment reagent of chrome, and therefore generation of chrome vanadium reduction slag in the vanadium extracting process from the vanadium slagis avoided, and circular use of the lead compound in the cadmium separation enrichment process is achieved. The chromium separating and recycling effect is good, the metal recycling rate is high, operation is easy and convenient, production cost is low, and the environment friendliness is achieved; the method is suitable for the industrial application of chromium separating and recycling from thevanadium contained chromate solution.

Description

technical field [0001] The invention relates to a method for separating and recovering chromium from a vanadium-containing chromate solution, belonging to the field of chemical metallurgy. Background technique [0002] Vanadium-chromium is a common associated element in vanadium-titanium magnetite, and vanadium-chromium is enriched in vanadium slag during the smelting process of vanadium-titanium magnetite. Therefore, the separation and recovery of V(V) and Cr(VI) from the vanadium-containing chromate solution is a problem that must be solved for the extraction of vanadium from vanadium slag. The aqueous solutions of V(V) and Cr(VI) have similar properties, and it is a worldwide problem to separate V(V) and Cr(VI) in the solution. At present, vanadium extraction from vanadium slag generally uses ammonium salt to precipitate ammonium polyvanadate, and then the solution (containing V0.1-0.5g / L, containing Cr 0.5-1.5g / L) after precipitation of vanadium is then reduced and neut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/44C22B34/32C22B34/22
CPCC22B3/44C22B7/006C22B34/22C22B34/32Y02P10/20
Inventor 王学文杨明鄂王明玉
Owner CENT SOUTH UNIV
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