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A method for separating and recovering vanadium, chromium and sodium carbonate from vanadium slag extracting vanadium

A technology of separation and recovery of sodium carbonate, applied in the direction of carbonate purification, alkali metal carbonate, chromate/dichromate, etc., can solve problems such as complex process, harsh process conditions, hazardous solid waste, etc. Achieve the effect of improving separation and recovery efficiency, good separation effect and environmental friendliness

Active Publication Date: 2019-01-22
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 efficiency of extraction and separation of chromium is low, the cost is high, and the process conditions are harsh
Chinese patent ZL 201210160816.1 utilizes the difference in exchange potential between V(V) and Cr(VI) in the vanadium extraction solution of vanadium slag by using weak base and strong base anion exchange resin, and directly separates V(V) and Cr(VI) by saturated adsorption, but The process is complex, and Cr(VI) will cause great damage to the resin, seriously affecting the service life of the resin
However, the calcium sulfate obtained through transformation is a hazardous solid waste because it contains Cr(VI).
Chinese patent 201710109248.5 first separates and recovers vanadium in the vanadium extraction solution from vanadium slag, then adds copper ions to precipitate Cr(VI), and then decomposes the obtained copper chromate with alkali to recover chromium. Although vanadium and chromium are separated and recovered in the process, the chromium in the solution All sodium carbonate is converted into sodium sulfate and cannot be recycled
[0004] Although the above-mentioned methods can separate and recover vanadium and chromium from the vanadium extracting liquid from vanadium slag, it is difficult to use them satisfactorily.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 1.5m of sodiumized roasting water leaching solution of vanadium slag containing V 35.6g / L and Cr 2.7g / L with pH 8.6 3 Calcium oxide was added at 1.2 times of the chemical reaction of vanadium to form calcium vanadate, stirred and ball milled at room temperature for 1.5 hours, and filtered to obtain a vanadium-precipitated solution containing 0.02g / L of V and a vanadium-enriched slag containing Cr2 Adjust the pH to 6.5, cool and crystallize at 0°C, and filter to obtain sodium bicarbonate crystals and a crystallization mother liquor containing Cr 8.1g / L. The crystallization mother liquor is continuously used as a feed solution for electrodialysis to separate and recover chromium.

Embodiment 2

[0029] Take the vanadium slag containing V 23.6g / L and Cr 21.8g / L with a pH of 9.1 and 1.5m of the vanadium extraction solution by sodium roasting 3 Calcium hydroxide was added at 1.1 times of the chemical reaction of vanadium to form calcium vanadate, stirred at 60°C for 2.5 hours, and filtered to obtain a vanadium precipitation solution containing 0.03g / L of V and a vanadium enriched slag containing Cr2 Adjust the pH to 6.5, cool and crystallize at -3°C, and filter to obtain sodium bicarbonate crystals and a crystallization mother liquor containing 53.1g / L Cr. The crystallization mother liquor is evaporated and concentrated and crystallized to obtain a purity of 99.34% sodium chromate crystals (Na 2 CrO 4 ·4H 2 O) 112.8g.

[0030] In this embodiment, the direct yield of vanadium is 94.45%, and the direct yield of chromium is 76.65%; the mother liquor of sodium chromate crystallization is returned to continue electrodialysis and concentration and enrichment, and the total recovery ...

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Abstract

The invention relates to a method of separating and recovering sodium vanadate, sodium chromate and sodium carbonate from vanadium slag vanadium extraction liquor. The method is characterized by comprising the following steps: firstly, separating and recovering vanadium in the vanadium slag vanadium extraction liquor by means of a calcium salt precipitation method; then concentrating and enrichingsodium vanadate and sodium carbonate in molybdenum precipitation post liquor by means of an electrodialysis process; returning fresh water obtained by electrodialysis to vanadium slag for a sodium modification and cinder roasting leaching step for recycled use; and separating and recovering sodium vanadate and sodium carbonate in strong water by means of a circular concentration-crystallization method. The method provided by the invention has the advantages of being good in separating effect of sodium vanadate, sodium chromate and sodium carbonate, simple in process, simple to operate, free of waste water and residual slag, environment-friendly and the like, and is suitable for industrialized application of vanadium slag vanadium extraction.

Description

Technical field [0001] The invention relates to a method for separating and recovering vanadium, chromium and sodium carbonate from vanadium slag vanadium extraction solution, and belongs to the field of chemical metallurgy. Background technique [0002] Both vanadium and chromium are transition elements of the fourth period. They are adjacent to each other and have similar properties. After magnetic separation of vanadium-titanium magnetite, the vanadium and chromium are mainly enriched in iron concentrate. After the iron concentrate is smelted by blast furnace and converter, vanadium and chromium are further enriched in vanadium slag. Vanadium slag is the main raw material of vanadium metallurgy. Although it also contains chromium, the extraction of vanadium from vanadium slag at home and abroad is mainly for the recovery of vanadium. Few people are interested in chromium. Because in most cases, the content of vanadium in vanadium slag is higher than that of chromium, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B7/04C22B34/22C22B34/32C01D7/32C01D7/24C01G37/14
CPCC01D7/24C01D7/32C01G37/14C22B3/44C22B7/04C22B34/22C22B34/32Y02P10/20
Inventor 王学文王明玉杨明鄂杜艳苹
Owner CENT SOUTH UNIV
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