Method for comprehensively treating liquid after vanadium precipitation by acid ammonium salt after vanadium extraction from vanadium slag

A technology for vanadium precipitation with acid ammonium salt and comprehensive treatment, applied in the field of waste liquid recovery, can solve the problems of long process route and high processing cost

Active Publication Date: 2021-07-06
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of this method is that the process route is long, the treatment cost is high, and the obtained vanadium chromium reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take pH 2.1 containing V 0.6g / L, Cr 0.9g / L, NH 4+ 8.5g / L vanadium slag extraction vanadium acid ammonium salt solution after vanadium precipitation 1.5m 3 , add ferric sulfate solution according to 4 times of the stoichiometric number of vanadium forming ferric vanadate, add alkali to adjust pH to 4.5, stir at room temperature for 0.5h, filter to obtain vanadium-removed liquid containing V 0.04g / L and Cr﹤0.3 % vanadium-enriched slag; gained vanadium-enriched slag is added to 1.5mol / L H 2 SO 4 In the solution, react at 95°C for 1.5h, and filter to obtain ferric sulfate solution and vanadium-enriched material containing hydrated vanadium pentoxide. The vanadium-enriched material is used as raw material for producing vanadium pentoxide, and the ferric sulfate solution is returned to the vanadium removal process for circulation Use; add sodium hydroxide and sodium bicarbonate to the obtained vanadium-removed solution to adjust the pH to 11, and stir at 90°C to catch ammon...

Embodiment 2

[0027] Take pH 2.5 containing V 0.3g / L, Cr 1.5g / L, NH 4+ 10.6g / L vanadium slag extraction vanadium acid ammonium salt solution after vanadium precipitation 5m 3 , add sodium hydroxide and sodium carbonate to adjust the pH to 12, and stir at 100°C to catch ammonia for 0.5h to obtain NH 3The concentration is 0.01g / L after the deamination, the volatile ammonia is sprayed and absorbed by the sulfuric acid solution to obtain the ammonium sulfate solution, and the ammonium sulfate solution obtained is returned to the ammonium salt vanadium precipitation process for recycling, and then according to (Cr+V) / Pb mole Add lead sulfate to the deaminated liquid at a ratio of 1:6, stir at 75°C for 1.5 hours to precipitate chromium and vanadium in it, filter to obtain the dechromed liquid and chromium-vanadium enriched slag, and the dechromed liquid The concentrations of V and Cr are 0.1mg / L and 0.2mg / L respectively; the resulting chromium-removed liquid is concentrated by nanofiltration to ...

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PUM

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Abstract

The invention discloses a method for comprehensively treating liquid after vanadium precipitation by acid ammonium salt after vanadium extraction from vanadium slag. The method comprises the following steps that alkali is directly added into the liquid after vanadium precipitation, heating is performed for deamination, then a precipitant A is added into the liquid after deamination to enrich vanadium and chromium, and filtering is performed to obtain liquid after chromium removal and vanadium and chromium enriched slag; or a precipitant B is added into the vanadium-precipitated liquid to enrich vanadium, filtering is performed to obtain vanadium-removed liquid and vanadium-enriched slag, then alkali is added into the vanadium-removed liquid, heating is performed for deamination, the precipitant A is added into the deaminated liquid to enrich chromium, filtering is performed to obtain chromium-removed liquid and chromium-enriched slag, and vanadium is regenerated, separated and recycled from the obtained vanadium-enriched slag; and chromium-enriched slag and vanadium-chromium-enriched slag are regenerated and separated to recover chromium and vanadium, the concentrations of V and Cr in the chromium-removed liquid are both larger than 0.5 mg/L, so that the generation of vanadium-chromium reducing slag and ammonium-containing sodium sulfate crystal substances is avoided. The method has the advantages of short process flow, simplicity and convenience in operation, high vanadium and chromium precipitation separation and recovery efficiency, environment friendliness and the like, and is suitable for industrial application.

Description

technical field [0001] The invention relates to a method for comprehensive treatment of liquid after vanadium extraction from vanadium slag after acidic ammonium salt precipitation, and belongs to the technical field of waste liquid recovery. Background technique [0002] Vanadium and its chemical products are the main metallurgical and chemical raw materials. Vanadium slag is the main raw material for vanadium metallurgy. Vanadium slag is roasted by sodium oxide-water immersion-acidic ammonium salt precipitation vanadium-vanadium oxide (V 2 o 5 and V 2 o 3 )—vanadium alloy process to produce vanadium products. Vanadium and chromium are similar in nature, and they usually coexist in minerals, and there are both vanadium and chromium in the liquid after vanadium extraction and precipitation of vanadium slag. Vanadium slag extraction vanadium acid ammonium salt solution pH value after vanadium precipitation is 2~3, which contains NH 4+ 8~11g / L, Na + 18~22g / L, SO 4 2- ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B34/22C22B34/32C01C1/02C01D5/06
CPCC22B7/008C22B34/32C22B34/22C01C1/02C01D5/06C01P2006/80Y02P10/20
Inventor 王学文田晟晖孟钰麒杨明鄂王懿王明玉
Owner CENT SOUTH UNIV
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