Method for preparing sintered NOx inhibitor by using metallurgical and municipal solid waste

An inhibitor and municipal technology, which is applied in the field of sintered NOx inhibitors, can solve the problems of resource waste, environmental pollution, land occupation, etc., and achieve the effects of avoiding secondary generation, simple preparation process, and inhibiting the formation of NOx

Active Publication Date: 2019-02-22
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as iron-containing metallurgical dust is concerned, the iron content is generally high, and a large amount of stockpiling causes waste of resources and environmental pollution. Therefore, the development of large-scale treatment technology to separate and utilize the iron in it has considerable market prospects.
[0005] The rapid development of social economy has brought about a sharp increase in municipal solid waste. The effective treatment method is mainly incineration, but the current treatment of incineration products basically stays at the solidified landfill level, which still occupies a large amount of land and pollutes the environment. , and there is still the risk of secondary release, which deviates from the original intention of incineration to reduce volume and volume. Therefore, how to realize resource utilization on the basis of harmless treatment of municipal solid waste is more realistic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Utilize the main composition as TFe 57.05%, SiO 2 The mixture with 5.31%, MgO 1.8%, and basicity 1.95 is conventionally sintered, and the maximum concentration of NOx emission is 349mg / m 3 .

Embodiment 2

[0039]Cleaning and preparation of sintered NOx inhibitors from metallurgical and municipal solid waste and its application method. Iron-containing metallurgical dust and high-calcium municipal solid waste are prepared into pellets with an iron grade of 52%, Ca / Fe of 0.7, and a particle size of 12 mm. And dry at 100°C for 60min, then heat up the dried pellets at a heating rate of 400°C / min to 1300°C for 15min, and then rapidly cool them at a cooling rate of 120°C / min to obtain a Ca-Fe base Solid roasted product, after the product is ground by a paint grinder for 10 minutes, the average particle size composition is 45 μm, and the powdered NOx inhibitor is uniformly sprayed on the surface layer of the sintered fuel with a spray gun, and the spraying amount is 5% of the fuel mass, and then participates in sintering, NOx emission maximum concentration is 285mg / m 3 , 18.3% lower than when no inhibitor was added.

Embodiment 3

[0041] Cleaning and preparation of sintered NOx inhibitors from metallurgical and municipal solid waste and its application method. The iron-containing metallurgical dust and high-calcium municipal solid waste are prepared into small balls with a particle size of 10mm and an iron grade of 47% and a Ca / Fe of 1.2. And dry at 400°C for 20 minutes, then heat up the dried pellets at a heating rate of 300°C / min to 1100°C for 60 minutes, and then rapidly cool them at a cooling rate of 60°C / min to obtain Ca-Fe The base solid roasted product, after the product is ground by a paint grinder for 15 minutes, the average particle size composition is 45 μm, and the powdered NOx inhibitor is uniformly sprayed on the surface layer of the sintered fuel with a spray gun, and the spraying amount is 15% of the mass of the fuel, and then participates in sintering , NOx emission maximum concentration is 249mg / m 3 , 28.7% lower than that without inhibitors.

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Abstract

The invention discloses a method for preparing sintered NOx inhibitor by using metallurgical and municipal solid waste. The sintered NOx inhibitor is obtained in the manner that metallurgical solid waste and municipal solid waste raw materials are subjected to pelletizing and roasting. In the sintering process of iron ore, the sintered NOx inhibitor is added on the surface of a fuel layer and plays a role of inhibiting the generation of NOx in the sintering process, the emission of the NOx can be reduced, and meanwhile the grade of iron ore sintered ore is not affected. The method provides a new way for clean resource utilization of the metallurgical and municipal solid waste.

Description

technical field [0001] The invention relates to a sintered NOx suppressor, in particular to a sintered NOx suppressor prepared by using metallurgy and municipal solid waste, and a method for using the sintered NOx suppressor in the sintering process to reduce NOx emissions. The invention belongs to the technical field of metallurgy and municipal solid (hazardous) waste harmless and resource utilization. Background technique [0002] In May 2018, the release of the "Steel Enterprise Ultra-Low Emission Transformation Work Plan (Draft for Comment)" put forward higher requirements for the flue gas emission of iron and steel enterprises, among which the NOx emission limit standard was lowered to 50mg / m 3 . Compared with the 100mg / m in June 2017 "Announcement on Amendment of 20 National Pollutant Emission Standards (Draft for Comment)" such as "Steel Sintering and Pelletizing Industry Air Pollutant Emission Standards" 3 , the major iron and steel enterprises have also realized t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 范晓慧汪国靖甘敏叶恒棣周志安王兆才季志云陈许玲姜涛李光辉袁礼顺赵元杰肖恒张一雄曹风
Owner CENT SOUTH UNIV
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