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Method for separating vanadium and chromium solution and recycling vanadium and chromium

A vanadium-chromium and solution technology, applied in the direction of improving process efficiency and the like, can solve the problems of difficult extraction process control, unfavorable industrial application, and high extraction agent cost, and achieves the effects of high recovery rate, low cost, and easy recovery.

Active Publication Date: 2016-08-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the advantages of separation of vanadium and chromium, high recovery rate, and industrial application, but has the disadvantages of difficult control of the extraction process and high cost of extraction agents.
Chinese patent CN103740934 makes vanadium enter the vanadium-rich organic phase through countercurrent extraction, chromium is left in the aqueous solution to realize the separation of vanadium and chromium, and then strips to obtain vanadium-rich aqueous solution, adding ammonium to precipitate and calcined to obtain vanadium pentoxide, and adding sodium sulfite to the chromium-containing solution After reduction with sulfuric acid, sodium hydroxide is used to precipitate chromium to obtain chromium hydroxide. This method also has the disadvantages of difficult control of the extraction process, high cost, and low efficiency.
Although this method can realize the effective separation of vanadium and chromium, and the purity of the obtained vanadium dioxide and chromium trioxide is not less than 98%, the method has complicated process, low efficiency and high cost, which is not conducive to industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Take 1L of vanadium chromium solution containing 1.2g / L V, 7.6g / L Cr, pH value of 2.3, first add sodium hydroxide solution to adjust the pH value to 9, and then press the pentavalent vanadium and hexavalent chromium in the solution under stirring. Reduction to 1.2 times the total theoretical amount of tetravalent vanadium and trivalent chromium, add sodium bisulfite, and react at 25°C for 2h. Filter to obtain chromium hydroxide filter cake and vanadium-containing filtrate. The chromium hydroxide filter cake was dried and calcined at 850° C. for 2.5 hours, then beaten, washed and dried to obtain a chromium trioxide product with a purity of 98.1%. Add hydrogen peroxide to the vanadium-containing filtrate according to 1.1 times the theoretical amount of oxidation of tetravalent vanadium to pentavalent vanadium in the solution, stir at 40°C for 1 hour, then add sulfuric acid solution to adjust the pH value to 2.3, and then add NH4 + Add ammonium carbonate at a molar ratio ...

Embodiment 2

[0034] Take 1L of vanadium chromium solution containing 21.6g / L V, 2.6g / L Cr, pH value of 1.8, first add sodium hydroxide solution to adjust the pH value to 11, and then press pentavalent vanadium and hexavalent chromium in the solution under stirring Reduced to 1.2 times the theoretical amount of tetravalent vanadium and trivalent chromium, add sodium sulfide, and react at 20°C for 1 hour. Filter to obtain chromium hydroxide filter cake and vanadium-containing filtrate. After the chromium hydroxide filter cake is dried, it is calcined at 800°C for 3 hours, then beaten, washed and dried to obtain a chromium trioxide product with a purity of 98.6%. Add sulfuric acid solution to the vanadium-containing filtrate to adjust the pH value to 5, stir at 60°C for 1 hour to obtain a hydrated vanadium dioxide precipitate, filter and dry at 120°C for 3 hours to obtain a vanadium dioxide product with a purity of 98.3%. The total recovery rate of vanadium in the whole process is 97.8%, and...

Embodiment 3

[0036] Measure 1L of vanadium-chromium solution containing 20.6g / L V, 40.5g / L Cr, and pH value of 11.6, and under stirring, reduce the pentavalent vanadium and hexavalent chromium into tetravalent vanadium and trivalent chromium respectively according to the total theoretical amount of tetravalent vanadium and trivalent chromium in the solution. 1.4 times of sulfur powder was added and reacted at 95°C for 5h. Filter to obtain chromium hydroxide filter cake and vanadium-containing filtrate. After the chromium hydroxide filter cake is dried, it is calcined at 1100° C. for 1 hour, then beaten, washed and dried to obtain a chromium trioxide product with a purity of 98.5%. Add sodium peroxide to the vanadium-containing filtrate according to 1.1 times the theoretical amount of oxidation of tetravalent vanadium to pentavalent vanadium in the solution, stir at 30°C for 0.5h, then add sulfuric acid solution to adjust the pH value to 10.1, and then add NH 4 + Ammonium sulfate was adde...

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Abstract

The invention discloses a method for separating a vanadium and chromium solution and recycling vanadium and chromium. A reducing agent is added to the vanadium and chromium solution under the condition that the pH value ranges from 8 to 14, and the temperature ranges from 20 DEG C to 100 DEG C, and pentavalent vanadium and hexavalent chromium are reduced into tetravalent vanadium and trivalent chromium; the trivalent chromium forms chromic hydroxide precipitate in situ, and a chromic hydroxide filter cake and vanadium-containing filtrate are obtained through filtering; the chromic hydroxide filter cake is used for preparing chromic oxide; and the vanadium-containing filtrate is used for preparing hydration vanadium dioxide or vanadyl sulfate or vanadium pentoxide. By means of the method, efficient separation and recovery of vanadium and chromium are achieved, the vanadium recovery rate reaches 96% or higher, the chromium recovery rate reaches 98% or higher, and the purity of vanadium and chromium products reaches 98% or higher. The method has the beneficial effects that the technological processes are short, the separation efficiency is high, the cost of raw materials and auxiliary materials is low, operation is easy and convenient, and the method can be used for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of inorganic chemistry, more specifically, the invention relates to a method for separating and recovering vanadium and chromium from a vanadium-chromium solution. Background technique [0002] Both vanadium and chromium are important strategic elements and are widely used in metallurgy and chemical industry. At present, vanadium and chromium are extracted from vanadium slag or chromite as raw materials, and sodium salt (sodium carbonate, sodium chloride, sodium sulfate, etc.) , respectively carry out ammonium salt vanadium precipitation and evaporation crystallization to obtain ammonium polyvanadate and sodium dichromate, and then further make various vanadium and chromium products. However, due to the very similar properties of vanadium and chromium, they often exist in a symbiotic manner in minerals and cannot be separated by physical means. In the process of roasting-water leaching to extract vanadium (chromium)...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B34/22C22B34/32
CPCC22B3/44C22B34/22C22B34/32Y02P10/20
Inventor 李明李千文李彩霞郭继科王英殷兆迁高官金彭毅杨仰军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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