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A method for recovering vanadium and tungsten at the same time by reconstituting titanium dioxide with spent SCR denitrification catalyst

A technology of denitrification catalyst and titanium dioxide, which is applied in the field of solid waste treatment, can solve the problems of unrestored deteriorated channels, low leaching rate and recovery purity of V and W, incomplete removal of impurities, etc., and achieve the improvement of environmental protection technology level, high leaching efficiency, The effect of pore structure restoration

Active Publication Date: 2022-04-22
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for recovering vanadium and tungsten at the same time by reconstituting titanium dioxide with a waste SCR denitrification catalyst, so as to solve the problem of incomplete removal of impurities and TiO 2 Technical problems such as unrecovered deteriorated channels and low V and W leaching rates and recovery purity, while achieving high-quality TiO 2 Carrier and high-purity V and W recovery

Method used

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  • A method for recovering vanadium and tungsten at the same time by reconstituting titanium dioxide with spent SCR denitrification catalyst
  • A method for recovering vanadium and tungsten at the same time by reconstituting titanium dioxide with spent SCR denitrification catalyst
  • A method for recovering vanadium and tungsten at the same time by reconstituting titanium dioxide with spent SCR denitrification catalyst

Examples

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Effect test

Embodiment 1

[0044] Wash the waste SCR denitrification catalyst raw material with high-pressure water to remove dust and other impurities, then dry, grind, and sieve (100 mesh), and collect the powder for subsequent processing. Mix 2 g of powder with 3% hydrofluoric acid solution, the solid-to-liquid ratio is 1:4, turn on the ultrasonic wave, the intensity is 200W, heat to 110°C, stir for 4 h, collect the Ti-W-V filter cake after filtering and washing. Ti-W-V filter cake is mixed with 30% sodium hydroxide solution, the amount of sodium hydroxide added is 1.5 times of the theoretical value, and the mixed slurry is added to the planetary ball mill, and 2 mm zirconia balls are added, and the powder is mixed with The mass ratio of the balls was 1:80, and the milling speed was 300 rpm for 3 hours. After the reaction, it was filtered and washed, and the solid was collected as Ti filter cake, and the filtrate was collected as W-V filtrate. Ti filter cake was mixed with 10% dilute sulfuric acid so...

Embodiment 2

[0047] Wash the waste SCR denitrification catalyst raw material with high-pressure water to remove dust and other impurities, then dry, grind, and sieve (100 mesh), and collect the powder for subsequent processing. Mix 2 g of powder with 3% hydrofluoric acid solution, the solid-to-liquid ratio is 1:8, turn on the ultrasonic wave, the intensity is 200W, heat to 110°C, stir for 4 h, collect the Ti-W-V filter cake after filtering and washing. The Ti-W-V filter cake was mixed with a 30% sodium hydroxide solution, the amount of sodium hydroxide added was twice the theoretical value, and the mixed slurry was added to a planetary ball mill, and 2 mm zirconia balls were added, and the powder was mixed with The mass ratio of the balls was 1:80, and the milling speed was 300 rpm for 3 h. After the reaction, it was filtered and washed to collect the solid as Ti filter cake and the collected filtrate as W-V filtrate. Ti filter cake was mixed with 10% dilute sulfuric acid solution, stirred...

Embodiment 3

[0050] Wash the waste SCR denitrification catalyst raw material with high-pressure water to remove dust and other impurities, then dry, grind, and sieve (100 mesh), and collect the powder for subsequent processing. Mix 2 g of powder with 4% hydrofluoric acid solution, the solid-to-liquid ratio is 1:8, turn on the ultrasonic wave, the intensity is 200W, heat to 110°C, stir for 4 h, collect the Ti-W-V filter cake after filtering and washing. The Ti-W-V filter cake was mixed with a 40% sodium hydroxide solution, the amount of sodium hydroxide added was twice the theoretical value, and the mixed slurry was added to a planetary ball mill, and 2 mm zirconia balls were added, and the powder was mixed with The mass ratio of the balls was 1:80, and the milling speed was 500 rpm for 3 h. After the reaction, it was filtered and washed, and the solid was collected as Ti filter cake, and the filtrate was collected as W-V filtrate. Ti filter cake was mixed with 10% dilute sulfuric acid solu...

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Abstract

The method for reconstituting titanium dioxide from the waste SCR denitration catalyst and recovering vanadium and tungsten simultaneously belongs to the technical field of solid waste treatment. The invention removes impurities in the waste SCR denitration catalyst and then crushes them and dissolves them with hydrofluoric acid, and deeply removes the impurities under the condition of ultrasound. While retaining most of V and W. Then use sodium hydroxide to convert Ti, V, W into Na 2 TiO 3 , Na 2 WO 4 , NaVO 3 , while using mechanical activation to strengthen the leaching reaction of V and W, solid Na 2 TiO 3 with liquid Na 2 WO 4 and NaVO 3 After separation, use sulfuric acid and Na 2 TiO 3 The chemical reaction to synthesize TiOSO 4 , after calcination to form TiO 2 , complete with TiO 2 Reconstruction of particle pore structure. Using the specific capture ability of molecular recognition materials for V and W, liquid Na 2 WO 4 and NaVO 3 Carry out separation and purification to complete the recovery of high-purity V and W. The overall process impurity removal rate is high, the V and W leaching efficiency is high, the energy consumption and material consumption of the leaching reaction are reduced, and the leaching wastewater is reduced, and the final TiO 2 The pore structure of the carrier is restored, the activity is improved, and it can be safely reused in the preparation of new catalysts.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, in particular to a method for recovering vanadium and tungsten while reconstituting titanium dioxide with a spent SCR denitrification catalyst. Background technique [0002] SCR denitrification catalysts are widely used in coal-fired power plants in my country, and the installation volume exceeds 1.1 million m 3 , but the average service life of the catalyst is 3 years, so it is expected to generate 300,000-400,000 m 3 Waste vanadium-tungsten-titanium SCR denitrification catalyst. The spent SCR denitrification catalyst contains valuable components, including about 80% TiO 2 carrier, 1% of V 2 o 5 active ingredient and 5% WO 3 , and TiO 2 The crystal form of V and W has not changed, so in theory, after proper treatment of the spent SCR denitration catalyst, the carrier and V, W can be recycled to the production of new catalysts. At present, my country's waste SCR denitrificati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/12C22B34/22C22B34/36
CPCC22B7/009C22B7/008C22B7/007C22B34/225C22B34/365C22B34/124C22B34/1254
Inventor 李雅轩路光杰侯波郑鹏陈鸥何发泉毕冬雪
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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