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Method for recovering mixed ammonium salt and lead titanate from waste SCR denitration catalyst

A technology for denitration catalysts and waste catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, titanates, etc., can solve the problems of low dielectric constant, uneven quality of lead titanate, high Curie temperature, etc. Achieve the effect of efficient recovery, low implementation cost, and high value of recovered products

Inactive Publication Date: 2020-09-11
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Lead titanate is a ferroelectric material with high Curie temperature and low dielectric constant. It has good application prospects in the field of composite electronic materials and can be used to manufacture composite electronic ceramics and improve the electrical properties of ceramics. , can also be used as a pigment for paint, but the quality of industrially prepared lead titanate is often uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 describes a cellular V 2 o 5 -WO 3 / TiO 2 The method for recovering vanadium-tungsten mixed ammonium salt and lead titanate from waste SCR denitration catalyst, the specific steps include:

[0036] (1) Pretreatment

[0037] Perform ash removal, water washing and crushing pretreatment on the waste catalyst to obtain waste catalyst powder below 500 mesh;

[0038] (2) Ammonia leaching to separate vanadium and tungsten

[0039] Using an ammonia solution with a volume concentration of 10% at 90°C and a liquid-to-solid mass ratio of 10:1, the spent catalyst powder was leached 6 times, and filtered to obtain the leaching solution and residue;

[0040] (3) Removal of impurities

[0041] Use 20% hydrochloric acid solution to adjust the pH value of the leaching solution to 10, add 0.5% magnesium chloride by mass of waste catalyst powder, stir at 70°C for 2 hours, and filter to obtain a vanadium-tungsten solution; wash the remaining solid residue after ammonia leac...

Embodiment 2

[0048] Example 2 describes a flat V 2 o 5 -MoO 3 / TiO 2 The method for recovering vanadium-molybdenum mixed ammonium salt and lead titanate from the waste SCR denitration catalyst, the specific steps include:

[0049] (1) Pretreatment

[0050] Perform ash removal and water washing treatment on the waste catalyst, and then separate and pulverize the catalyst from the metal mesh plate to obtain waste catalyst powder below 500 mesh;

[0051] (2) Separation of vanadium and molybdenum by ammonia leaching

[0052] Using an ammonia solution with a volume concentration of 30% at 60°C and a liquid-solid mass ratio of 5:1, the spent catalyst powder was leached four times, and filtered to obtain the leaching solution and residue;

[0053] (3) Removal of impurities

[0054] Use 20% hydrochloric acid solution to adjust the pH value of the leaching solution to 11, add magnesium chloride with 3% mass of waste catalyst powder, stir at 90°C for 0.5h, and filter to obtain a vanadium-molyb...

Embodiment 3

[0061] Example 3 describes another cellular V from 2 o 5 -MoO 3 / TiO 2 The method for recovering vanadium-molybdenum mixed ammonium salt and lead titanate from the waste SCR denitration catalyst, the specific steps include:

[0062] (1) Pretreatment

[0063] Perform ash removal, water washing and crushing pretreatment on the waste catalyst to obtain waste catalyst powder below 500 mesh;

[0064] (2) Separation of vanadium and molybdenum by ammonia leaching

[0065] Using an ammonia solution with a volume concentration of 15% at 80°C and a liquid-to-solid mass ratio of 7:1, the spent catalyst powder was leached 5 times, and filtered to obtain the leaching solution and residue;

[0066] (3) Removal of impurities

[0067] Use 20% hydrochloric acid solution to adjust the pH value of the leaching solution to 10.5, add magnesium chloride with a waste catalyst powder mass of 1.5%, stir at 80°C for 1.5h, and filter to obtain a vanadium-molybdenum solution; use 3% dilute hydrochl...

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Abstract

The invention belongs to the field of non-ferrous metal recovery, and particularly relates to a method for recovering mixed ammonium salt and lead titanate from a waste SCR denitration catalyst. The recovery method mainly comprises the steps of waste catalyst pretreatment, ammonia leaching, impurity removal, evaporative crystallization, titanium precipitation and the like. By means of the recoveryprocess, vanadium-tungsten or vanadium-molybdenum mixed ammonium salt and high-purity lead titanate products can be obtained through recovery, the process element recovery rate is high, the product quality is excellent, and the recovery process is simple and easy to implement and has certain applicability in the field of waste catalyst recovery.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, and in particular relates to a method for recovering mixed ammonium salt and lead titanate from waste SCR denitration catalysts. Background technique [0002] SCR denitrification technology is widely used in the field of industrial flue gas treatment. In addition to power plants, many industries such as steel and cement have also begun to install and use SCR denitrification catalysts to treat NOx in flue gas, which has also led to waste SCR denitrification catalysts. production gradually increased. According to statistics, in 2025, more than 820,000 tons of waste SCR denitrification catalysts will need to be disposed of nationwide. [0003] The operating environment of SCR denitrification catalysts is usually very harsh. Various heavy metal elements such as mercury, lead, chromium, etc. in the flue gas will deposit on the surface of the catalyst along with the fly ash, causing secondary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00C01G31/00C01G39/00C01G41/00B01J23/30B01J23/28
CPCB01J23/28B01J23/30C01G23/003C01G31/00C01G39/00C01G39/006C01G41/00C01G41/006C01P2006/80
Inventor 陆强刘吉密腾阁欧阳昊东周新越郑树
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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