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

A denitration catalyst, vanadium-titanium-based technology, applied in the field of recovering vanadium and tungsten, and non-ferrous metals, can solve the problems of poor contact between solid catalyst and solid sodium carbonate, low recovery rate of vanadium and tungsten, poor reactivity, etc., and achieve the recovery rate of vanadium. Low, energy saving, low cost effect

Active Publication Date: 2013-12-11
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

[0032] The tungsten-containing vanadium-titanium-based waste denitration catalyst is crushed, ground, and sieved to select a powder with a particle size of 100-120 mesh. Add 20wt% hydrogen peroxide to catalyst powder, wherein H 2 o 2 The molar ratio to the vanadium in the catalyst is 15:1, fully stirred for 1 hour, part of the vanadium and H in the catalyst 2 o 2 The reaction produces pervanadic acid, which is filtered to obtain a filter cake (1) and a pervanadic acid filtrate (1) containing hydrogen peroxide. Add HCl to the filtrate (1) to adjust its pH value to 5.5, then heat to 40°C, and keep the temperature constant for a certain period of time to decompose pervanadic acid into V 2 o 5 , filtered to get V 2 o 5 Precipitation and filtrate (2), and the filtrate (2) is mixed with hydrogen peroxide for recycling. Add 4wt% NaOH solution to the filter cake (1), wherein the solid-to-liquid ratio is 1g / 10ml, then heat to 60°C, stir and react at constant temperature for 1 ho...

Embodiment 2

[0035] Crushing, grinding, and sieving the tungsten-containing vanadium-titanium-based waste denitration catalyst to select a powder with a particle size of 100-120 mesh, and adding 5wt% hydrogen peroxide to the catalyst powder, wherein H 2 o 2 The molar ratio to the vanadium in the catalyst is 10:1, fully stirred for 3 hours, part of the vanadium and H in the catalyst 2 o 2 The reaction produces pervanadic acid, which is filtered to obtain a filter cake (1) and a pervanadic acid filtrate (1) containing hydrogen peroxide. Add H to the filtrate (1) 2 SO 4 Adjust its pH value to 4.0, then heat to 70°C, and keep the temperature constant for a certain period of time to decompose pervanadic acid into V 2 o 5 , filtered to get V 2 o 5 Precipitation and filtrate (2), and the filtrate (2) is mixed with hydrogen peroxide for recycling. Add 10wt% KOH solution to the filter cake (1), where the solid-to-liquid ratio is 1g / 1ml, heat to 100°C, stir and react at constant temperature ...

Embodiment 3

[0038] Crush, grind, and sieve the tungsten-containing vanadium-titanium-based waste denitration catalyst to select a powder with a particle size of 100-120 mesh, and add 30wt% hydrogen peroxide to the catalyst powder, wherein H 2 o 2 The molar ratio of vanadium in the catalyst is 15:1, fully stirred for 0.5 hours, part of the vanadium in the catalyst and H 2 o 2 The reaction produces pervanadic acid, which is filtered to obtain a filter cake (1) and a pervanadic acid filtrate (1) containing hydrogen peroxide. Add H to the filtrate (1) 2 SO 4 Adjust its pH value to 3.5, then heat to 50°C, and keep the temperature constant for a certain period of time to decompose pervanadic acid into V 2 o 5 , filtered to get V 2 o 5 Precipitation and filtrate (2), and the filtrate (2) is mixed with hydrogen peroxide for recycling. Add 0.2wt% KOH solution to the filter cake (1), where the solid-to-liquid ratio is 1g / 5ml, heat to 50°C, stir and react at constant temperature for 3 hours,...

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Abstract

The invention relates to a method for recovering nonferrous metals from a waste denitration catalyst, and specifically relates to a method for recovering vanadium and tungsten from a tungsten containing vanadium-titanium based waste denitration catalyst. The method mainly comprises the following steps: crushing and grinding the catalyst, adding hydrogen peroxide to enable part of vanadium oxide to form pervanadic acid, and filtering to obtain a filter cake and a filtrate containing pervanadic acid; after heating the filtrate, filtering again to obtain V2O5, and mixing and circulating to use a novel filtrate and hydrogen peroxide; adding alkali liquor to the filter cake, stirring and heating, leaching the residual vanadium in form of metavanadate and leaching tungsten in form of metatungstate; filtering to obtain mixed liquor of metavanadate and metatungstate; adding ammonium salt into the mixed liquor to separate out ammonium metavanadate precipitate, further filtering to obtain an ammonium metavanadate filter cake and a third filtrate, and adding a concentrated acid into the third filtrate to separate out tungstic acid precipitate. The method and process provided by the invention are simple, and when metavanadate and tungstic acid are leached, calcination is avoided, so that the energy consumption is low, the solid-liquid reaction is good in contact, and the recovery rates of vanadium and tungsten are high.

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 and tungsten from tungsten-containing vanadium-titanium-based waste 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 Reduce NO x for N 2 carry out NO x remove. 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): C22B7/00C22B34/22C22B34/36
CPCY02P10/20
Inventor 刘清雅李启超刘振宇
Owner BEIJING UNIV OF CHEM TECH
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