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A kind of vanadium recovery method based on the vanadium-containing solution of waste scr denitrification catalyst

A denitrification catalyst and solution technology, applied in chemical instruments and methods, vanadium oxide, vanadium compounds, etc., can solve the problems of low vanadium recovery rate and low purity, achieve high recovery rate, considerable economic benefits, and solve the effect of processing problems

Active Publication Date: 2017-02-01
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, for the recovery of vanadium in vanadium-containing solutions, the prior art generally has problems such as low recovery rate of vanadium and low purity, and these problems need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 has described a kind of method that reclaims high-purity vanadium pentoxide in the vanadium-containing solution (obtained by reducing acid leaching method) obtained from the separation of waste SCR denitration catalyst, and its specific steps include:

[0034] (1), the vanadium-containing solution obtained by reducing acid leaching is concentrated to a vanadium element concentration of 500mg / L, and 5% hydrogen peroxide is slowly added dropwise to the solution until the solution turns from blue to yellow completely; at this time, all the vanadium elements It is oxidized to the highest valence + 5 valence;

[0035] (2), drop 10% sodium hydroxide solution in the solution, adjust the pH value of the solution to 1.8;

[0036] (3), preparation each component content is N235 (trioctyl tertiary amine): tributyl phosphate: n-butanol: kerosene=10%: 5%: 10%: 75% extractant solution to step (2) The resulting solution is subjected to 4 stages of extraction, and the vol...

Embodiment 2

[0042] Embodiment 2 has also described a kind of method that reclaims high-purity ammonium metavanadate in the vanadium-containing solution (obtained by reducing acid leaching method) obtained from waste SCR denitration catalyst separation, and its specific steps include:

[0043] (1), the vanadium-containing solution gained by reducing acid leaching method is concentrated to the concentration of vanadium element and is 600mg / L, slowly adds potassium chlorate in solution, until solution turns yellow completely by blue; Now, vanadium element is all oxidized to Highest price + 5 prices;

[0044] (2), dropwise add 30% ammonia solution to the solution, adjust the pH value of the solution to 1.5;

[0045] (3), preparation each component content is trioctylamine: tributyl phosphate: isooctyl alcohol: sherwood oil=5%: 8%: 10%: 77% extractant solution carries out 5 grades to step (2) gained solution Extraction, and the volume ratio O / A=1 / 3 of the organic phase and the aqueous phase i...

Embodiment 3

[0051] Embodiment 3 has described another kind of method that reclaims high-purity vanadium pentoxide in the vanadium-containing solution (obtained by reducing acid leaching method) obtained from the separation of waste SCR denitration catalyst, and its specific steps include:

[0052] (1) Concentrate the vanadium-containing solution obtained by the dissolution method to a vanadium element concentration of 500 mg / L, and slowly add potassium permanganate to the solution until the solution becomes light pink and does not fade; at this time, all vanadium elements are oxidized It is the highest price + 5 price;

[0053] (2), dropwise add 15% sodium hydroxide solution in the solution, adjust the pH value of the solution to 1.5;

[0054] (3), the preparation of each component content is N263 (methyl trioctyl ammonium chloride): tributyl phosphate: secondary octanol: kerosene=10%: 5%: 10%: 75% extractant solution to step ( 2) The resulting solution is subjected to 6 stages of extrac...

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Abstract

The invention specifically relates to a method for recovering high-purity ammonium metavanadate and vanadic anhydride from a vanadium-containing solution by using an extraction process, which belongs to the field of recovery of non-ferrous metals. The method provided by the invention is based on the vanadium-containing solution obtained by separating elemental vanadium from a waste vanadium-tungsten-titanium system SCR denitration catalyst and comprises the following steps: fully concentrating the vanadium-containing solution at first; then adding an oxidizing agent to oxidize vanadium in the solution to a highest valence state; adjusting the pH value of the solution; then transferring the elemental vanadium to strip liquor by using the extraction process; and finally, treating the strip liquor so as to recover high-purity ammonium metavanadate and vanadic anhydride.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, and in particular relates to a method for recovering high-purity ammonium metavanadate or vanadium pentoxide from a vanadium-containing solution obtained by separating a waste SCR denitrification catalyst by using an extraction method. Background technique [0002] At present, the SCR denitrification catalyst widely used in flue gas denitrification fields such as coal-fired power stations is the vanadium-tungsten-titanium system (V 2 o 5 -WO 3 / TiO 2 Type) honeycomb, flat or corrugated plate catalysts, in these catalysts, vanadium pentoxide (V 2 o 5 ) is an essential active ingredient. However, vanadium pentoxide is a Class B inorganic highly toxic substance, which poses a huge hazard to human health. The vanadium-tungsten-titanium system SCR denitration catalyst has a limited service life (generally only 3 to 5 years). If the waste SCR denitration catalyst is piled up randomly wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00C01G31/02
Inventor 张景文
Owner 北京华电光大环境股份有限公司
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