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A kind of tungsten recovery method of tungsten-containing solution based on waste SCR denitration catalyst

A denitrification catalyst and solution technology, applied in chemical instruments and methods, tungsten oxide/tungsten hydroxide, liquid solution solvent extraction, etc., can solve the problems of unrecoverable tungsten element and low tungsten recovery rate, and achieve high selectivity , The effect of less impurities in the stripping liquid and high extraction rate

Active Publication Date: 2016-11-30
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tungsten trioxide obtained by this scheme contains a large amount of silicon and aluminum impurities, and the recovery rate of tungsten is low, and the tungsten element cannot be recovered effectively

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 describes a method for recovering high-purity tungsten trioxide from the tungsten-containing solution obtained by separating the waste SCR denitration catalyst, and its specific steps include:

[0033] (1), adding hydrochloric acid solution with a volume concentration of 15% to the tungsten-containing solution, adjusting the pH value of the tungsten-containing solution to 9;

[0034] (2) Heat the tungsten-containing solution to 80°C and maintain this temperature for 2 hours;

[0035] (3), after heating, treat that solution is cooled to room temperature, filter to obtain clear solution;

[0036] (4), the preparation volume percentage is the extractant solution of N263 methyl trioctyl ammonium chloride: secondary octanol: decanol: kerosene=5%: 10%: 5%: 80%, clarification to step (3) gained The solution is subjected to 4 stages of extraction, and the volume ratio of the organic phase to the aqueous phase in each stage of extraction is O / A=1 / 3;

[0037] (5), ...

Embodiment 2

[0042] Embodiment 2 also describes a method for reclaiming high-purity ammonium metatungstate from the tungsten-containing solution obtained by separating the waste SCR denitration catalyst, and its specific steps include:

[0043] (1), adding a sulfuric acid solution with a volume concentration of 10% to the tungsten-containing solution to adjust the pH value of the tungsten-containing solution to 10;

[0044] (2) Heat the tungsten-containing solution to 60°C and maintain this temperature for 3 hours;

[0045] (3), after heating, treat that solution is cooled to room temperature, filter to obtain clear solution;

[0046] (4), preparation volume percentage is the extractant solution of N235 trioctyl tertiary amine: isooctyl alcohol: tributyl phosphate: kerosene=8%: 10%: 10%: 72%, clarification to step (3) gained The solution is subjected to 5 stages of extraction, and the volume ratio of the organic phase to the aqueous phase of each stage of extraction is O / A=1 / 2;

[0047] ...

Embodiment 3

[0052] Example 3 describes another method for recovering high-purity tungsten trioxide from the tungsten-containing solution obtained by separating the waste SCR denitration catalyst, and its specific steps include:

[0053] (1), adding hydrochloric acid solution with a volume concentration of 20% to the tungsten-containing solution, adjusting the pH value of the tungsten-containing solution to 8;

[0054] (2) Heat the tungsten-containing solution to 70°C and maintain this temperature for 2 hours;

[0055] (3), after heating, treat that solution is cooled to room temperature, filter to obtain clear solution;

[0056] (4), preparation volume percentage is the extractant solution of N235 trioctyl tertiary amine: n-butanol: tributyl phosphate: kerosene=5%: 5%: 10%: 80%, clarification to step (3) gained The solution is subjected to 6 stages of extraction, and the volume ratio of the organic phase to the aqueous phase of each stage of extraction is O / A=1 / 3;

[0057] (5), after ex...

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Abstract

The invention belongs to the field of non-ferrous metal recycling, and particularly relates to a method for recycling high purity ammonium meta-tungstate and tungsten trioxide from a tungsten-containing solution through an extraction method. On the basis of the tungsten-containing solution obtained by separating tungsten elements in a wasted vanadium, tungsten and titanium system SCR denitration catalyst, the pH value of the tungsten-containing solution is adjusted first, silicon and aluminum in the solution are subjected to hydrolysis to be precipitated out from the solution, then the extraction method is used for transferring the tungsten elements into strip liquor, and the ammonium meta-tungstate and the tungsten trioxide can be obtained in a recycling mode by handling the tungsten-containing strip liquor.

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 metatungstate or tungsten trioxide from a tungsten-containing solution obtained by separating a waste SCR denitrification catalyst by using an extraction method. Background technique [0002] At present, most of the flue gas denitrification technologies used in my country's coal-fired power plants are SCR denitrification technologies. SCR denitrification catalysts are divided into honeycomb type, flat plate type and corrugated plate type according to the structure; but no matter what type, its service life is usually 3~ 5 years, then it will become a waste SCR denitrification catalyst. [0003] Waste SCR denitration catalysts contain a large amount of non-ferrous metal resources, such as tungsten trioxide content in waste SCR denitration catalysts usually can reach 5-10%. Random stacking of waste SCR denitration ca...

Claims

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Application Information

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IPC IPC(8): C01G41/00C01G41/02B01D11/04
Inventor 张景文
Owner 北京华电光大环境股份有限公司
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