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Method for utilizing municipal sludge as raw material of steel industrial sintering ore

A technology for municipal sludge and iron and steel industry, which is applied in the direction of sludge treatment, chemical instruments and methods, and process efficiency improvement. The effect of high input ratio and reduced processing cost

Active Publication Date: 2011-04-27
SHOUGANG ENVIRONMENTAL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for utilizing municipal sludge as a raw material for sintering ore in the iron and steel industry, which overcomes the problems of landfilling, composting and incineration of municipal sludge, as well as making sludge bricks and building materials, which occupy land and pollute the land environment. , high disposal costs, etc.

Method used

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  • Method for utilizing municipal sludge as raw material of steel industrial sintering ore
  • Method for utilizing municipal sludge as raw material of steel industrial sintering ore

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The calcified sludge after lime drying treatment is naturally air-dried to a moisture content of 10%, then crushed to a particle size of 0.05-1mm, and added to the sintered raw material, and its mass (dry basis) is 2% of the total mass of the sintered raw material. %. The results of the sintering test show that: compared with no sludge particles, after adding lime calcified sludge, the amount of lime added is reduced by 0.8%, the sintering finished product rate is increased by 4.1%, the sintering utilization coefficient is increased by 10.2%, and the solid fuel consumption Reduced by 3.8kg / T, the performance of sintered ore is significantly improved, and the cost of sintering is significantly reduced.

Embodiment 2

[0023] The calcified sludge after lime drying treatment is granulated. After the sludge is granulated, it is naturally air-dried to a moisture content of 2%, and then it is crushed to a particle size of 0.05-1mm, and added to the sintering raw material. base) is 3% of the total mass of sintered raw materials. The sintering test results show that: compared with no sludge particles, after adding lime calcified sludge, the amount of lime added is reduced by 1.2%, the sintering finished product rate is increased by 5.0%, the sintering utilization coefficient is increased by 13.0%, and the solid fuel consumption Reduced by 0.6kg / T, the performance of sintered ore is significantly improved, and the cost of sintering is significantly reduced.

Embodiment 3

[0025]The calcified sludge after lime drying treatment is granulated. After the sludge is granulated, it is naturally air-dried to a moisture content of 10%, and then crushed to a particle size of 0.05-3mm, and added to the sintered raw material. base) is 3.5% of the total mass of sintered raw materials. The sintering test results show that: compared with no sludge particles, after adding lime calcified sludge, the amount of lime added is reduced by 1.6%, and the sintered finished product rate is increased by 1.5%. The sintering utilization coefficient increased by 2.0%, the solid fuel consumption decreased by 0.3kg / T, the performance of sintering ore was improved, and the sintering cost was significantly reduced.

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Abstract

The invention relates to a method for utilizing municipal sludge as a raw material of a steel industrial sintering ore and belongs to the technical fields of harmless treatment and high-additional-value utilization of municipal solid waste. The method comprises the following steps of: mixing the municipal sludge and quicklime according to a ratio; drying and dehydrating the mixture to obtain calcified sludge; adding the calcified sludge into sintering raw materials with correspondingly adjusted components according to a certain ratio and a certain mode, and allowing the mixture to enter the sintering process with other sintering raw materials; and producing the sintering core products serving as iron-making raw materials. The method has the advantages that: the lime calcified municipal sludge is added, so the sludge treatment cost is reduced and the secondary pollution problem during the sludge treatment is solved; the harmless treatment and the recycling utilization of municipal solid waste are realized; and the calcified sludge is added, so that the vertical sintering speed, the finished product ratio and the utilization coefficient can be effectively increased in the process of sintering the sintering core, the added amount of flux and fuel in the sintering raw materials is reduced, the raw material cost is reduced, and multiple purposes are fulfilled.

Description

technical field [0001] The invention belongs to the technical field of harmless disposal and utilization of urban solid waste, and in particular relates to a method for utilizing urban sludge as a raw material for sintering ore in the iron and steel industry. Background technique [0002] Municipal sludge is the product of urban municipal sewage treatment process, part of which is produced by the direct separation of sewage, and the other part is produced during the process of sewage treatment. During the "Eleventh Five-Year Plan" period, my country incorporated "energy conservation and COD emission reduction" into binding targets, urban sewage treatment developed rapidly, and the total amount of urban sludge production increased rapidly. A large amount of urban sludge needs to be treated in time to reduce the amount of sludge piled up and avoid environmental pollution. In recent years, the country has paid more and more attention to the problem of urban sludge. In 2009, th...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/14C22B1/16
CPCY02P10/20
Inventor 廖洪强岳昌盛余广炜赵鹏
Owner SHOUGANG ENVIRONMENTAL IND
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