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Method for producing vanadium pentoxide from vanadium-containing solution

A technology of vanadium pentoxide and solution, which is applied in the direction of vanadium oxide, chromate/dichromate, etc., can solve the problems of low vanadium precipitation rate and inability to precipitate ammonium polyvanadate, and achieve separation recovery, production The effect of low cost and convenient operation

Inactive Publication Date: 2020-02-18
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In addition, the weakly acidic ammonium salt precipitation method requires V in the vanadium-containing liquid 2 o 5 Concentration above 6g / L, for V 2 o 5 The vanadium precipitation rate of the solution with a concentration lower than 6g / L is very low, and ammonium polyvanadate cannot even be precipitated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Take 2.5m of qualified solution for vanadium extraction from vanadium slag containing V 41.7g / L and Cr 1.2g / L with a pH of 8.1 3 , add sulfuric acid to adjust the pH to 4.1, then add copper sulfate according to 1.8 times the theoretical amount of the vanadium and chromium converted into copper salt, and add sodium hydroxide to adjust the pH to 5.2, stir at room temperature for 1 hour, filter to obtain vanadium-enriched slag and Vanadium-precipitated solution; the concentrations of vanadium and chromium in the vanadium-precipitated solution are both 2 o 5 99 quality standard; the filtrate containing copper sulfate of gained returns to continue to be used as the precipitating enrichment agent of vanadium chromium in the vanadium slag extraction qualified liquid of vanadium.

Embodiment 2

[0032] Take 2.5m of qualified solution for vanadium extraction from vanadium slag containing V 31.6g / L and Cr 13.8g / L with pH 8.3 3, add sulfuric acid to adjust the pH to 2.3, then add copper hydroxide according to 2.1 times the theoretical amount of the vanadium and chromium converted into copper salt, stir and dissolve, then add sodium hydroxide to adjust the pH to 5.7, stir at room temperature for 1.5h, and filter to obtain Vanadium-enriched slag and vanadium-precipitated liquid; the concentrations of vanadium and chromium in the vanadium-precipitated liquid are both 2 o 5 99 quality standard; the obtained filtrate containing copper chloride is adjusted to pH 5.8 by adding sodium bicarbonate, and stirred at 15°C for 1.5h to make chromium precipitate again in the form of copper salt, and filter to obtain copper chromate filter cake and precipitated chromium After liquid, after chromium precipitation, the liquid is reused after sodium removal; the obtained copper chromate fil...

Embodiment 3

[0034] Take 5L of vanadium-rich liquid (V 22.27g / L, P 0.01g / L, Si0.02g / L, Fe 0.74g / L) obtained by sulfuric acid leaching-solvent extraction of vanadium-containing stone coal, and first add alkali to adjust the pH value to 3.8, Add sodium chlorate according to 1.3 times the theoretical amount of tetravalent vanadium in the solution to oxidize pentavalent vanadium, oxidize at 65°C for 1.5h, filter, remove Fe and other impurities precipitated during the oxidation process, and then convert the vanadium into copper vanadate Add copper sulfate 1.5 times the theoretical amount, then add sodium hydroxide to adjust the pH to 6.1, stir at room temperature for 1 hour, filter to obtain vanadium-enriched slag and vanadium-precipitated liquid; the concentration of vanadium in the vanadium-precipitated liquid is 0.008g / L, vanadium The precipitation rate is 99.96%. The obtained vanadium-precipitated liquid is returned to continue to be used as a leaching solution for vanadium extraction from ...

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Abstract

The invention discloses a method for producing vanadium pentoxide from a vanadium-containing solution. The method specifically comprises the following steps: adding a copper-containing reagent into asolution of vanadic acid or vanadate, adjusting the pH value to precipitate the vanadium or vanadium and chromium in a copper salt form, performing filtration to obtain vanadium-enriched residues anda vanadium-precipitated liquid, directly returning the vanadium-precipitated liquid to the vanadium leaching procedure for cycle use, or removing sodium and returning the sodium-removed vanadium-precipitated liquid to the vanadium leaching procedure for continuous use, performing acid leaching on the vanadium-enriched residues, performing filtration to obtain a pure hydrated vanadium pentoxide filter cake, and calcining the hydrated vanadium pentoxide to obtain the vanadium pentoxide product. The method has the advantages of simple process, convenience in operation, low production cost, good product quality and the like, and is suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of chemical metallurgy, and in particular relates to a method for producing vanadium pentoxide from a vanadium-containing solution. Background technique [0002] Vanadium pentoxide is the most commonly used vanadium-containing compound. The methods for producing vanadium pentoxide from vanadium-containing solution mainly include hydrolysis precipitation, calcium salt precipitation, iron salt precipitation and ammonium salt precipitation. Among them, the hydrolysis precipitation method is divided into the pentavalent vanadium hydrolysis precipitation method and the tetravalent vanadium hydrolysis precipitation method, and the ammonium salt precipitation method is divided into weakly alkaline ammonium salt precipitation method and weak acid ammonium salt precipitation method. The pentavalent vanadium hydrolysis precipitation method is to adjust the pH of vanadic acid or sodium vanadate solution to 1.5-2.5, raise the tem...

Claims

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Application Information

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IPC IPC(8): C01G31/02C01G37/14
CPCC01G31/02C01G37/14
Inventor 王学文杨皓翔孟钰麒王懿王明玉
Owner CENT SOUTH UNIV
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