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A method for recovering nano-nickel titanate and high-purity tungsten slag from waste SCR denitration catalyst

A waste catalyst and denitrification catalyst technology, applied in chemical instruments and methods, nanotechnology, tungsten oxide/tungsten hydroxide, etc., can solve the problems of low recovery rate of elements, single recovered products, low value of recovered products, etc., and achieve product purity High, efficient recovery, and the effect of promoting the precipitation of titanium elements

Active Publication Date: 2022-03-15
北京华电光大环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing recovery process of titanium and tungsten elements in waste SCR denitration catalysts generally has defects such as low recovery rate of elements, single recovered products, and low value of recovered products. Therefore, it is urgent to develop a more efficient new recovery process for titanium and tungsten elements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1 has described a kind of method that reclaims nano-nickel titanate and high-purity tungsten slag from waste SCR denitration catalyst, and concrete steps include:

[0034] (1) Pretreatment

[0035] The waste SCR denitration catalyst was calcined at 550°C for 6 hours, and then the waste catalyst was soot-blown and pulverized to obtain waste catalyst powder with a mesh size of less than 300.

[0036] (2) acid soluble

[0037] Prepare a sulfuric acid solution with a volume concentration of 90%, add waste catalyst powder according to the liquid-solid mass ratio of 5:1, heat the solution to 80°C and stir for 1.5h. After the reaction is completed and the solution is cooled, filter to obtain titanium liquid and tungsten slag.

[0038] (3) Recovery of nickel titanate

[0039] Dissolve nickel chloride and polyacrylic acid in ethanol, prepare a precipitant with a concentration of nickel chloride of 1.5 mol / L and a concentration of polyacrylic acid of 0.05 mol / L, add ...

Embodiment 2

[0044] Embodiment 2 has described a kind of method that reclaims nano-nickel titanate and high-purity tungsten slag from waste SCR denitration catalyst, and specific steps include:

[0045] (1) Pretreatment

[0046] The spent SCR denitrification catalyst was calcined at 750°C for 3 hours, and then the spent catalyst was soot-blown and pulverized to obtain spent catalyst powder with a mesh size of less than 300.

[0047] (2) acid soluble

[0048] Prepare a sulfuric acid solution with a volume concentration of 70%, add waste catalyst powder according to the liquid-solid mass ratio of 10:1, heat the solution to 120°C and stir for 4 hours. After the reaction is completed and the solution is cooled, filter to obtain titanium liquid and tungsten slag.

[0049] (3) Recovery of nickel titanate

[0050] Dissolve nickel chloride and polyacrylic acid with ethanol, prepare a precipitant with a nickel chloride concentration of 3mol / L and a polyacrylic acid concentration of 0.25mol / L, add...

Embodiment 3

[0055] Embodiment 3 describes another method for recovering nano-nickel titanate and high-purity tungsten slag from the waste SCR denitration catalyst, and the specific steps include:

[0056] (1) Pretreatment

[0057] The spent SCR denitrification catalyst was calcined at 650°C for 4 hours, and then the spent catalyst was subjected to soot blowing and pulverization to obtain spent catalyst powder below 300 mesh.

[0058] (2) acid soluble

[0059] Prepare a sulfuric acid solution with a volume concentration of 75%, add waste catalyst powder according to the liquid-solid mass ratio of 7:1, heat the solution to 110°C and stir for 3 hours. After the reaction is completed and the solution is cooled, filter to obtain titanium liquid and tungsten slag.

[0060] (3) Recovery of nickel titanate

[0061] Dissolve nickel chloride and polyacrylic acid with ethanol, prepare a precipitant with a nickel chloride concentration of 2mol / L and a polyacrylic acid concentration of 0.15mol / L, ad...

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Abstract

The invention belongs to the field of non-ferrous metal recovery, in particular to a method for recovering nano-nickel titanate and high-purity tungsten slag from waste SCR denitration catalysts. The recovery method of the present invention mainly includes the steps of waste catalyst pretreatment, acid dissolution, titanium recovery and tungsten slag treatment. Through this recovery process, high-value nano-nickel titanate and high-purity tungsten slag products can be recovered. Higher, the product purity meets industrial application, and the recovery process is simple and easy. It is a new and efficient recovery process for titanium and tungsten elements in waste SCR denitration catalysts.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, in particular to a method for recovering nano-nickel titanate and high-purity tungsten slag from waste SCR denitration catalysts. Background technique [0002] Titanium and tungsten elements are rare metal elements, which are relatively scattered in nature and low in content. It is difficult to extract and utilize, and requires a lot of cost. However, the content of precious metal resources in solid waste is often much higher than that in natural ores, and the types of impurity elements are relatively small. Therefore, there are significant advantages in recovering precious metal resources in a specific form from solid waste according to specific needs, the complexity and difficulty of the recovery process will be greatly reduced, and a large amount of production costs will also be saved. Waste SCR denitration catalyst is a solid waste rich in precious metal resources, in which the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00B82Y40/00C01G41/02
CPCC01G53/00B82Y40/00C01G41/02C01P2006/80
Inventor 曲艳超陈晨陆强
Owner 北京华电光大环境股份有限公司
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