Processing method of SCR denitration catalyst

A denitration catalyst and treatment method technology, applied in the field of non-ferrous metal recovery, can solve problems such as difficult treatment, and achieve the effects of improving fluidity, reducing pollution, and strong practicability

Active Publication Date: 2017-01-11
马鞍山艺诚机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that existing waste SCR denitrification catalysts are difficult to treat, the present invention provides a treatment method for SCR denitrification catalysts. The SCR denitrification catalyst is dissolved in molten iron, and the harmful vanadium pentoxide is formed into a stable, non-toxic Calcium vanadate (3CaO·V 2 o 5 ), reduce the environmental pollution of waste SCR denitrification catalysts, in addition, molten iron can be used to manufacture wear-resistant iron balls, make full use of the stainless steel in the flat catalyst, will not cause secondary pollution, and has strong practicability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment adopts 3 tons of electric arc furnaces to prepare molten iron:

[0034] Add 1500kg of steel scrap and 1000kg of pig iron into an electric arc furnace and heat it to 1600°C. The carbon content in the pig iron is 6%. After the scrap steel and pig iron are completely melted, add 1250kg of waste flat denitrification catalyst. The flat denitration catalyst is composed of carrier and catalyst, wherein the carrier is 430 stainless steel, and the mass fraction of the carrier is 40% (500kg) As a catalyst, the Cr content in the carrier is 16%; the catalyst is made of TiO 2 , V 2 o 5 and WO 3 composition, where TiO 2 The mass fraction is 85% (637.5kg), V 2 o 5 The mass fraction is 5% (37.5kg), WO 3 The mass fraction of is 10% (75kg).

[0035] After the flat plate denitration catalyst is melted, add 34.25kg of lime and 28.5kg of waste honeycomb denitration catalyst. The waste honeycomb denitration catalyst uses ceramics as the carrier, and the ceramic c...

Embodiment 2

[0039] Present embodiment adopts 5 tons of electric arc furnaces to prepare molten iron:

[0040] Add 2500kg of steel scrap and 1800kg of pig iron into the electric arc furnace and heat to 1600°C, the carbon content in the pig iron is 6%. After the scrap steel and pig iron are fully melted, add 1750kg of waste flat-type denitrification catalyst. The flat-type denitration catalyst is composed of a carrier and a catalyst. The carrier is 430 stainless steel, and the carrier accounts for 40% (700kg) of the flat-type denitration catalyst. As a catalyst, the Cr content in the carrier is 16%; the catalyst is made of TiO 2 , V 2 o 5 and WO 3 composition, where TiO 2 The mass fraction is 85% (892.5kg), V 2 o 5 The mass fraction is 5% (52.5kg), WO 3 The mass fraction of is 10% (105kg).

[0041] After the flat denitration catalyst is melted, add 47.65kg of lime and 74.3kg of waste honeycomb catalyst. The waste honeycomb catalyst uses ceramics as the carrier, and the ceramic carri...

Embodiment 3

[0044] Present embodiment adopts 10 tons of electric arc furnaces to prepare molten iron:

[0045] Add 5000kg of scrap steel and 4000kg of pig iron into the electric arc furnace and heat to 1600°C, the carbon content in the pig iron is 6%. After the scrap steel and pig iron are completely melted, add 3000kg of waste flat denitrification catalyst. The flat denitration catalyst is composed of a carrier and a catalyst. As a catalyst, the Cr content in the carrier is 16%; the catalyst is made of TiO 2 , V 2 o 5 and WO 3 composition, where TiO 2 The mass fraction is 85% (1530kg), V 2 o 5 The mass fraction is 5% (90kg), WO 3 The mass fraction of is 10% (180kg).

[0046] After the flat denitrification catalyst is melted, add 81.8kg of lime and 116.24kg of waste honeycomb catalyst. The waste honeycomb catalyst uses ceramics as the carrier, and the ceramic carrier accounts for 30% of the total mass. The SiO2 in the carrier 2 The mass fraction of CaO is 12.5%, and the mass frac...

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Abstract

The invention discloses a processing method of an SCR denitration catalyst, and belongs to the field of waste recycling. The processing method comprises the steps of firstly, preparing molten iron; secondly, adding molten iron into the SCR denitration catalyst; thirdly, carrying out slagging, and maintaining the temperature of the molten iron to range from 1300 DEG C to 2100 DEG C; fourthly, pouring out a slag system, obtaining the molten iron, adjusting the components of the molten iron, pouring and mould entering, and obtaining a wear-resisting steel ball after heat treatment. The molten iron is prepared through waste steel and/or pig iron in a melting manner, through slagging, vanadium is converted into stable and nontoxic vanadate, the pollution of a waste SCR denitration catalyst to the environment is reduced, the molten iron obtained after treatment of the SCR denitration catalyst can be used for manufacturing the wear-resisting steel ball, the treatment cost is low, practicability is high, and economic benefits are good.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal recovery, and more specifically relates to a treatment method for an SCR denitration catalyst. Background technique [0002] Denitrification catalyst generally refers to the catalyst (Catalyst) used in the SCR (selective catalytic reduction) denitrification system of the power plant. In the SCR reaction, the substance that promotes the chemical reaction of the reducing agent selectively with the nitrogen oxides in the flue gas at a certain temperature . At present, SCR commercial catalysts are basically based on TiO 2 as base material, with V 2 o 5 As the main active ingredient, with WO 3 、MoO 3 As an auxiliary component for anti-oxidation and anti-poisoning, the catalyst type can be divided into three types: plate type, honeycomb type and corrugated plate type. [0003] The plate catalyst is based on a metal mesh pressed from a stainless steel plate, and TiO 2 , V 2 o 5 etc. adhere to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B34/22
CPCY02P10/20
Inventor 王先玉刘小亚毛翔崔有为
Owner 马鞍山艺诚机电有限公司
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