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Method for preparing sintered mixture from municipal sludge and ferrous iron containing metallurgical dust

A municipal sludge and iron and steel metallurgy technology, applied in the direction of process efficiency improvement, etc., can solve problems affecting sintering air permeability, metallurgical dust and sludge secondary pollution, etc., achieve efficient resource recycling, improve air permeability and sinter quality , The effect of reducing processing costs

Active Publication Date: 2010-06-02
SHOUGANG ENVIRONMENTAL IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (2) Solve the problem of secondary pollution of metallurgical dust and sludge in the sintering process and affect the gas permeability of sintering, and increase the utilization ratio of metallurgical dust and sludge in the sintering process;

Method used

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  • Method for preparing sintered mixture from municipal sludge and ferrous iron containing metallurgical dust
  • Method for preparing sintered mixture from municipal sludge and ferrous iron containing metallurgical dust

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In the ratio of raw materials to be prepared for sintering ingredients (calculated as 100%), the main raw materials are municipal sludge and gas ash, and the high-water sludge (lime-calcified sludge, water content: 40%; CaO: 49.2%; SiO 2 : 3.0%), the addition amount is 30%, gas ash (moisture content: 2%; TFe: 22.0%; C: 46.5%; SiO 2 (CaO: 6.4%; CaO: 4.9%) is 70%. The raw materials are mixed uniformly in the mixer, and then 9.6wt% of water is added to the total mass ratio, and then granulated and screened by a vibrating screening device. Produce granulated particles of suitable size (2 : 5.4%; CaO: 9.9%, the 0.5m drop strength and compressive strength of 20 pellets with a particle diameter of 5-10mm are measured, the average value of 0.5m drop strength is 5.8 times, and the average value of compression strength is 19.1N , Has a good use strength.

Embodiment 2

[0041] In the raw material ratio (calculated as 100%) for sintering ingredients preparation, the main raw materials are municipal sludge and gas ash, and the raw materials are dry sludge (lime calcified sludge, water content: 2%; CaO: 49.2%; SiO 2 : 3.0%), the added amount is 24%, gas ash (water content: 2%; TFe: 22.0%; C: 46.5%; SiO 2 (CaO: 6.4%; CaO: 4.9%) is 76%. The raw materials are mixed uniformly in the mixer, and then 19.8wt% of water is added to the total mass ratio, and then granulated, and passed through a vibrating screening device The granulated particles of suitable size (2 :5.5%; CaO: 12.7%, the 0.5m drop strength and compressive strength of 20 pellets with a particle diameter of 5-10mm are measured. The average value of 0.5m drop strength is 6.8 times, and the average value of compressive strength is 22.6N , Has a good use strength.

Embodiment 3

[0043] In the ratio of raw materials to be prepared for sintering ingredients (calculated by 100%), the main raw materials are urban sludge, gas ash and converter OG mud, and the ratio of raw materials is urban sludge (lime-calcified sludge, water content: 40 %; CaO: 49.2%; SiO 2 : 3.0%), the addition amount is 20%, gas ash (water content: 2%; TFe: 22.0%; C: 46.5%; SiO 2 : 6.4%; CaO: 4.9%) the addition amount is 40%, converter OG mud (water content: 20%; TFe: 41.5%; C: 4.4%; SiO 2 :2.4%; CaO: 20.0%) The addition amount is 40%, the raw materials are mixed uniformly in the mixer, and then 8.0wt% of the total mass of water is added to the granulation, and the vibrating screening device The granulated particles of suitable size (2 : 4.4%; CaO: 17.1%, the 0.5m drop strength and compressive strength of 20 pellets with a particle diameter of 5-10mm are measured, the average value of 0.5m drop strength is 8.9 times, and the average value of compressibility is 29.1N , Has a good use stre...

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Abstract

The invention relates to a method for preparing a sintered mixture from municipal sludge and iron containing metallurgical dust, which belongs to the technical field of resource recycling of the municipal sludge and the iron containing metallurgical dust. The method comprises the following steps of: preparing raw materials from 5-50 percent by weight of municipal sludge and 50-95 percent by weight of iron containing metallurgical dust, adding 0-20 percent by weight of water into the raw materials, then mixing and granulating to produce a sintered granular material, and using the sintered granular material as the mixture to be mixed into a sintering working procedure, wherein the proportion mixed into the sintering working procedure is 0.5-10 percent by weight of the total sintered raw materials quality. The method has the advantages that the processing flow of the municipal sludge is transferred to the mature sintering process flow of ferrous metallurgy, avoiding the problems of new energy consumption, secondary pollution and the like caused in traditional landfill and sintering processes of the municipal sludge, thereby recycling effective elements in the metallurgical dust and the municipal sludge in the steel production flow, improving sintering production process conditions to a certain degree and improving the sintering production efficiency.

Description

Technical field [0001] The present invention belongs to the technical field of resource recycling utilization of urban sludge and iron-containing dust in iron and steel metallurgy, and in particular provides a method for preparing sintering ingredients from urban sludge and iron-containing dust in iron and steel metallurgy, which is harmless and has high added value The processing technology field particularly relates to a method for preparing sintering ingredients using municipal sludge and metallurgical iron-containing dust sludge. Background technique [0002] Municipal sludge is the product of wastewater treatment. The forecast shows that my country’s wastewater discharge in 2010 will reach 4.40×10 10 t / a, reaching 5.36×10 in 2020 10 t / a. The sludge volume usually accounts for 0.3-0.5% of the sewage volume and about 1-2% of the sewage treatment volume. If advanced treatment, the sludge volume will increase by 0.5-1 times. Compared with foreign countries, my country’s sewage t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCY02P10/20
Inventor 廖洪强余广炜岳昌盛赵鹏冯向鹏付建华许晓杰王荣张作顺孙鹏辉李冀闽
Owner SHOUGANG ENVIRONMENTAL IND
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