Method for extracting tungsten, titanium and vanadium from waste SCR (selective catalytic reduction) catalyst

A technology of SCR catalyst and tungstic acid, applied in the field of titanium, vanadium, and tungsten extraction, can solve the problems of high equipment requirements, environmental pollution, large investment, etc., and achieve the effects of low equipment requirements, simple and mature technology, and low energy consumption

Inactive Publication Date: 2013-02-20
成都新智金森环保科技有限公司
View PDF3 Cites 82 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because this method needs to be roasted at high temperature for many times, the equipment requirements are high, the investment is large, the energy consumption i...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add the discarded SCR catalyst crushed to 120 mesh into 20% sodium hydroxide solution by mass percentage, react at a temperature of 200°C for 3 hours, and filter and separate to obtain the SCR catalyst for detungsten and vanadium, sodium tungstate and vanadic acid Sodium mixed solution, wherein the waste SCR catalyst and sodium hydroxide are in a mass ratio of 10:6;

[0026](2) First, according to the mass ratio of sulfuric acid to sodium tungstate and sodium vanadate mixed solution of 1:3, make it into a sulfuric acid solution with a mass percentage concentration of 70%, and then add it to the mixed solution of sodium tungstate and sodium vanadate , reacted at 150°C for 4 hours, filtered and separated to obtain a mixed solution of tungstic acid solid, sodium sulfate and sodium vanadate, then added ammonia water to the mixed solution of sodium sulfate and sodium vanadate to adjust the pH value to 7.00, precipitated, separated by filtration Ammonium vanadate solid an...

Embodiment 2

[0030] (1) Add the discarded SCR catalyst crushed to 200 mesh into a 30% potassium hydroxide solution by mass percentage, react at a temperature of 180°C for 5.5 hours, and filter and separate to obtain the SCR catalyst for detungsten and vanadium, sodium tungstate and vanadic acid Sodium mixed solution, wherein the waste SCR catalyst and potassium hydroxide are in a mass ratio of 10:4.5;

[0031] (2) First, according to the mass ratio of sulfuric acid to sodium tungstate and sodium vanadate mixed solution of 1:4.5, make it into a sulfuric acid solution with a mass percentage concentration of 76%, and then add it to the mixed solution of sodium tungstate and sodium vanadate , reacted at 160°C for 2.5 hours, filtered and separated to obtain a mixed solution of tungstic acid solid, sodium sulfate and sodium vanadate, then added ammonia water to the mixed solution of sodium sulfate and sodium vanadate to adjust the pH value to 7.20, precipitated, separated by filtration Ammonium ...

Embodiment 3

[0035] (1) Add the discarded SCR catalyst crushed to 170 mesh into 26% sodium hydroxide solution by mass percentage, react at a temperature of 150°C for 4 hours, filter and separate to obtain the SCR catalyst for detungsten and vanadium, sodium tungstate and vanadic acid Sodium mixed solution, wherein the waste SCR catalyst and sodium hydroxide are in a mass ratio of 10: 5;

[0036] (2) First, according to the mass ratio of sulfuric acid to sodium tungstate and sodium vanadate mixed solution of 1: 5, make it into a sulfuric acid solution with a mass percentage concentration of 80%, and then add it to the mixed solution of sodium tungstate and sodium vanadate , reacted at 170°C for 3.5 hours, filtered and separated to obtain a mixed solution of tungstic acid solid, sodium sulfate and sodium vanadate, then added ammonia water to the mixed solution of sodium sulfate and sodium vanadate to adjust the pH value to 8.00, precipitated, separated by filtration Ammonium vanadate solid a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for extracting tungsten, titanium and vanadium from a waste SCR (selective catalytic reduction) catalyst, which comprises the following steps: crushing the waste SCR catalyst, adding a strongly alkaline solution, and reacting; filtering, separating, then adding strong acid into the sodium tungstate and sodium vanadate mixed solution, and reacting to obtain tungstic acid and a sodium salt and vanadic acid mixed solution; regulating the pH value of the sodium salt and vanadic acid mixed solution until precipitate is separated out, thus obtaining ammonium vanadate; then adding sulfuric acid into the tungsten-and-vanadium-removed SCR catalyst, and reacting to obtain a titanyl sulfate solution and solids such as aluminum slag and the like; then adding water into the titanyl sulfate solution, and hydrolyzing to obtain titanic acid and a waste acid solution; and finally, respectively calcining the obtained ammonium vanadate, tungstic acid and titanic acid to obtain vanadium pentoxide, tungsten trioxide and titanium dioxide. According to the invention, tungsten, titanium and vanadium can be extracted from the SCR catalyst through the reaction with strong alkali and strong acid at a low temperature, the equipment requirement is low, the energy consumption is low, some products having added values can be coproduced, and no secondary pollution is generated, thereby facilitating popularization and application.

Description

technical field [0001] The invention belongs to the technical field of recycling waste catalysts, in particular to a method for extracting tungsten, titanium and vanadium from waste SCR catalysts. Background technique [0002] SCR (Selective Catalytic Reduction) catalyst is used in thermal power plants to remove nitrogen oxide pollutants produced by combustion, which also contains V 2 o 5 and other harmful substances. According to data, as of 2008, SCR devices of 20 million kilowatts of thermal power units have been put into operation in China, and the installed capacity of SCR devices under construction in 2009 is 100 million kilowatts. The resulting problem of SCR catalyst recycling and reuse Also on the agenda. It is estimated that by 2010, the installed capacity of domestic SCR devices will reach 320 million kilowatts, and the initial filling capacity of catalysts will reach 260,000 m 3 . Calculated based on the three-year service life of the SCR catalyst, by 2012, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01G41/02C01G31/02C01G23/08
Inventor 罗建斌王勇利吕宏达邢喜红
Owner 成都新智金森环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap