Method for recovering vanadium, tungsten and titanium from waste vanadium-tungsten-titanium-based denitration catalyst

A denitration catalyst, vanadium-tungsten-titanium technology, applied in the recovery of non-ferrous metals, recovery of vanadium, tungsten and titanium from waste vanadium-tungsten-titanium-based denitration catalysts, can solve the problems of low recovery rate of vanadium and tungsten, poor reactivity and high energy consumption

Active Publication Date: 2014-01-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above methods all follow the method of extracting vanadium from vanadium ore, that is, adding sodium salt to high-temperature roasting, resulting in high energy consumption, and poor contact between solid catalyst and solid sodium carbonate, resulting in poor reactivity between the two, low recovery rate of vanadium and tungsten

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Crushing, grinding, and sieving the vanadium-tungsten-titanium-based denitrification catalyst into a powder with a particle size of 100-120 mesh; : 5ml), then blow in air and heat to 180°C, stir and react at constant temperature for 2 hours; the reaction product is filtered to obtain titanate filter cake and KVO-containing 3 and K 2 WO 4 Alkaline filtrate; add water with a mass ratio of 1:10 to the titanate filter cake, then adjust the pH of the solution to 10 with KOH, and separate the solid and liquid after fully stirring, and dry the solid at 110°C for a certain period of time to obtain potassium titanate product; add HCl to the alkaline filtrate, adjust the pH value of the filtrate to 9, then add NH 4 Cl solution, where V:NH 4 ＋ The molar ratio is 1:2, after stirring for a certain period of time, let it stand, and filter to obtain NH 4 VO 3 and the new filtrate; add concentrated hydrochloric acid to the new filtrate, stir for a certain period of time, let it s...

Embodiment 2

[0038] Crushing, grinding, and sieving the vanadium-tungsten-titanium-based denitrification catalyst to make a powder with a particle size of 100-120 mesh; : 1ml), then bubbling oxygen and heating to 120°C, stirring at constant temperature for 3 hours; the reaction product was filtered to obtain titanate filter cake and containing KVO 3 and K 2 WO 4 Alkaline filtrate; add water with a mass ratio of 1:10 to the titanate filter cake, then use HCl to adjust the pH value of the solution to 5, heat the solution to 40°C, stir and react at a constant temperature for 12 hours, and finally perform solid-liquid separation. The solid product titanic acid was washed with water and dried, then calcined at 500°C for 2 hours to obtain titanium dioxide; HCl was added to the alkaline filtrate to adjust the pH value of the filtrate to 9, and then NH 4 Cl solution, where V:NH 4 ＋ The molar ratio is 1:3, after stirring for a certain period of time, let it stand, and filter to obtain NH 4 VO ...

Embodiment 3

[0041] Crushing, grinding, and sieving the vanadium-tungsten-titanium-based denitrification catalyst into a powder with a particle size of 100-150 mesh; : 10ml), then blow in air and heat to 350°C, stir and react at constant temperature for 1 hour; the reaction product is filtered to obtain titanate filter cake and containing NaVO 3 and Na 2 WO 4 Alkaline filtrate; add water with a mass ratio of 1:10 to the titanate filter cake, then use HCl to adjust the pH value of the solution to 5, heat the solution to 70°C, stir and react at a constant temperature for 2 hours, and finally perform solid-liquid separation. The solid product titanic acid was washed with water and dried, and then calcined at 500°C for 2 hours to obtain titanium dioxide; HCl was added to the alkaline filtrate to adjust the pH value of the filtrate to 8, and then NH 4 Cl solution, where V:NH 4 ＋ The molar ratio is 1:2, after stirring for a certain period of time, let it stand, and filter to obtain NH 4 VO ...

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Abstract

The invention relates to a method for recovering non-ferrous metals from waste denitration catalysts, particularly relates to a method for recovering vanadium, tungsten and titanium from a waste vanadium-tungsten-titanium-based denitration catalyst, belonging to the field of non-ferrous metal recovery technologies. The method mainly comprises the steps of preparing the catalyst into powder with the grain size being smaller than 100 meshes, and adding concentrated alkali liquor; heating to react vanadium, tungsten and titanium with alkali, so as to produce slightly-soluble titanate, water-soluble vanadate and tungstate; filtrating to obtain a titanate filter cake, wherein titanate or titanic acid can be prepared from the filter cake; adding ammonium salt into a filtrate so as to precipitate ammonium metavanadate, and filtrating to obtain ammonium metavanadate and a new filtrate; adding concentrated acid into the new filtrate, thereby preparing solid tungstic acid. The method has the advantages of simple process, low energy consumption, good solid-liquid reaction contact, high vanadium, tungsten and titanium recovery rate, and the like.

Description

technical field [0001] The invention relates to a method for recovering non-ferrous metals from waste denitration catalysts, in particular to a method for recovering vanadium, tungsten and titanium from waste vanadium-tungsten-titanium-based denitration catalysts, and belongs to the technical field of non-ferrous metal recovery. Background technique [0002] Nitrogen oxides (NO X ) is recognized as one of the main sources of air pollution, including combustion smoke and vehicle exhaust. Monolithic vanadium-titanium-based catalysts have been widely used for NO in flue gas or tail gas X The removal of NH by selective catalysis 3 Reduction of NOx to N 2 Perform NOx removal. The catalyst is TiO 2 For the carrier (usually 80-90% of the total mass), V 2 o 5 is the active ingredient (accounting for 1-2%), WO 3 or MoO 2 It is a catalytic component (accounting for 5-10%). The initial investment of catalyst in denitrification project usually accounts for 30-50% of the total ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22C22B34/36C22B34/12C01G41/00C01G31/00C01G23/00
CPCY02P10/20Y02P20/584
Inventor 刘清雅刘振宇李启超
Owner BEIJING UNIV OF CHEM TECH
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