Method of selectively recovering yttrium from CRT fluorescent powder for doping preparation of ternary composite oxide catalyst

A ternary composite and fluorescent powder technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve secondary pollution, high activation temperature, and production costs advanced questions

Active Publication Date: 2018-10-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalyst is the biggest core of denitrification technology. At present, coal-fired power plants are widely using V 2 o 5 -WO 3 /TiO 2 SCR denitrification technology is a catalyst, which has high denitrification efficiency, strong anti-poisoning, and can meet environmental protection requirements, but the production cost is high and the activation temperature is high (300-430°C). The following flue gas treatment capacity is limited, and V 2 o 5 Toxic and easy to cause secondary pollution
Iron-base

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] [Example 1]

[0016] The process and steps of this embodiment are as follows:

[0017] (1) Use the sieve method to remove large pieces of glass impurities to obtain the particle size> 200 mesh CRT phosphor waste, put the waste into the flip-type ball mill, and control the milling time for 12 hours;

[0018] (2) Fully mix the CRT phosphor waste obtained in step (1) with the alkali metal compound, and put it into a high-temperature box furnace for alkali fusion reaction. After the alkali fusion reaction is over, cool in air and take out the waste. The CRT phosphor waste : The mass ratio of the alkali metal compound is 1:4, the alkali metal compound is sodium peroxide and sodium carbonate, the mass ratio of the two is 3:1, the alkali melting temperature is 500° C., and the alkali melting time is 10 min.

[0019] (3) Put the alkali fusion waste obtained in step (2) together with the crucible into a beaker, add ammonia water for immersion, and carry out impurity removal reaction, an...

Example Embodiment

[0025] [Example 2]

[0026] The process and steps of this embodiment are as follows:

[0027] (1) Use the sieve method to remove large pieces of glass impurities to obtain the particle size> 200 mesh CRT phosphor waste, put the waste into the turning ball mill, and control the milling time for 13h;

[0028] (2) Fully mix the CRT phosphor waste obtained in step (1) with the alkali metal compound, and put it into a high-temperature box furnace for alkali fusion reaction. After the alkali fusion reaction is over, cool in air and take out the waste. The CRT phosphor waste : The mass ratio of the alkali metal compound is 1:4, the alkali metal compound is sodium peroxide and sodium carbonate, the mass ratio of the two is 4:1, the alkali melting temperature is 520° C., and the alkali melting time is 12 min.

[0029] (3) Put the alkali fusion waste obtained in step (2) together with the crucible into a beaker, add ammonia water for immersion, and carry out impurity removal reaction, and carry...

Example Embodiment

[0035] [Example 3]

[0036] The process and steps of this embodiment are as follows:

[0037] (1) Use the sieve method to remove large pieces of glass impurities to obtain the particle size> 200 mesh CRT phosphor waste, put the waste into the flip-type ball mill, and control the milling time for 14 hours;

[0038] (2) Fully mix the CRT phosphor waste obtained in step (1) with the alkali metal compound, and put it into a high-temperature box furnace for alkali fusion reaction. After the alkali fusion reaction is over, cool in air and take out the waste. The CRT phosphor waste : The mass ratio of the alkali metal compound is 1:5, the alkali metal compound is sodium peroxide and sodium carbonate, the mass ratio of the two is 4:1, the alkali melting temperature is 550° C., and the alkali melting time is 15 min.

[0039] (3) Put the alkali fusion waste obtained in step (2) together with the crucible into a beaker, add ammonia water for immersion, carry out impurity removal reaction, and ca...

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Abstract

The invention belongs to the technical field of environmental catalysis, and especially relates to a method of selectively recovering yttrium from CRT fluorescent powder for doping preparation of ternary composite oxide catalyst, which includes the steps of: 1) performing initial treatment to the waste CRT fluorescent powder and performing high temperature alkali melting to prepare an alkali molten product; 2) leaching the alkali molten product with ammonia water and performing solid liquid separation to removal a major impurity, zinc; 3) performing extraction with diluted hydrochloric acid and enriching and recovering rare earths through a two-step precipitation method, and performing secondary extraction with diluted hydrochloric acid to obtain a rare earth extract liquid; 4) preparing yttrium oxalate by combining photochemical method and chemical precipitation method; 5) performing coprecipitation to obtain the ternary composite oxide catalyst. The method can high-effectively separate and extract and fully utilize the rare earths in the waste CRT fluorescent powder. By doping the yttrium, low temperature denitration performance of the catalyst is significantly improved. The method reduces production cost of the catalyst and actually achieves treating waste by waste.

Description

technical field [0001] The invention belongs to the technical field of environmental catalysis, and in particular relates to a method for selectively recovering yttrium in CRT fluorescent powder for doping to prepare a ternary composite oxide catalyst. Background technique [0002] Nitrogen oxides (NO X ) In addition to directly damaging human health as a primary pollutant, it will also produce a variety of secondary pollution (such as acid rain, photochemical smog). NO X Control technology and countermeasures have been included in the key environmental science and technology issues for regional air pollutant control. my country's current NO X The emissions mainly come from automobiles, boiler combustion, industrial production, etc. Different fuels have different effects on NO X The contribution of emissions is different. According to statistics, among various fuels, coal combustion is the most X The largest source of emissions, accounting for more than 60% of total emi...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01D53/56B01D53/86
CPCB01D53/8628B01J23/002B01J23/83B01J2523/00B01J2523/36B01J2523/3712B01J2523/842
Inventor 王维吴玉锋潘德安
Owner BEIJING UNIV OF TECH
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