Method of separating and recovering sodium vanadate, sodium chromate and sodium carbonate from vanadium slag vanadium extraction liquor

A technology for separation and recovery of sodium carbonate, applied in the direction of carbonate purification, alkali metal carbonate, chromate/dichromate, etc., can solve the problems of complex process, harsh process conditions, dangerous solid waste, etc. To achieve the effect of improving separation and recovery efficiency, good separation effect and simple process

Active Publication Date: 2018-03-06
CENT SOUTH UNIV
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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 vanadium slag sodium roasting water leaching solution containing V 35.6g / L and Cr 2.7g / L with pH 8.6 3 , calcium oxide was added according to 1.2 times of the chemical reaction of vanadium to form calcium vanadate, and the mixture was ball-milled at room temperature for 1.5h, and filtered to obtain a vanadium precipitation liquid containing V 0.02g / L 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 8.1 g / L.

Embodiment 2

[0029] Take the vanadium slag containing V 23.6g / L and Cr 21.8g / L with a pH of 9.1 for sodium roasting and vanadium extraction liquid 1.5m 3 , add calcium hydroxide according to 1.1 times of the chemical reaction number of vanadium forming calcium vanadate, stir at 60°C for 2.5h, filter to obtain the vanadium precipitation liquid containing V 0.03g / L and the vanadium enrichment slag containing Cr2Adjust pH to 6.5, crystallize by cooling at -3°C, filter to obtain sodium bicarbonate crystals and a crystallization mother liquor containing Cr 53.1g / L, and crystallize after the crystallization mother liquor is evaporated and concentrated to obtain a purity of 99.34% sodium chromate crystals (Na 2 CrO 4 ·4H 2 O) 112.8 g.

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

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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 extraction liquid, belonging to the field of chemical metallurgy. Background technique [0002] Both vanadium and chromium are transition elements of the fourth period, which are located adjacent to each other and have similar properties. After the magnetic separation of vanadium titanomagnetite, the vanadium and chromium are mainly concentrated in the iron concentrate, and after the iron concentrate is smelted by blast furnace-converter blowing, the vanadium and chromium are further enriched into the vanadium slag. Vanadium slag is the main raw material of vanadium metallurgy. Although it also contains chromium, vanadium extraction from vanadium slag at home and abroad is mainly for the recovery of vanadium, and few people are interested in chromium. Because in most cases, vanadium slag contains more vanadium than chromium, and t...

Claims

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Application Information

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Patent Type & Authority Applications(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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