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

A technology for iron and steel metallurgy and urban sludge, applied in the direction of improving process efficiency, can solve the problems of secondary pollution of metallurgical dust and sludge, affecting the permeability of sintering, etc., to achieve environmental protection, efficient recycling of resources, and uniform composition. Effect

Active Publication Date: 2011-09-21
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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

[0043] In the raw material ratio (100%) to be prepared by sintering batching, municipal sludge, gas ash and converter OG mud are the main raw materials, and urban sludge (lime calcified sludge, water content: 40% %; CaO: 49.2%; SiO 2 : 3.0%) was added in an amount of 20%, gas ash (moisture content: 2%; TFe: 22.0%; C: 46.5%; SiO 2 : 6.4%; CaO: 4.9%) was added in an amount of 40%, converter OG mud (moisture content: 20%; TFe: 41.5%; C: 4.4%; SiO 2 : 2.4%; CaO: 20.0%) is added in an amount of 40%, the raw materials are mixed evenly in the mixer, and then granulated after adding water accounting for 8.0wt% of the total mass ratio, through a vibrating screening device The granulated particles with suitable size (2 : 4.4%; CaO: 17.1%. The 0.5m drop strength and compressive strength were measured for 20 pellets with a particle size of 5-10mm. The average value of the 0.5m drop strength was 8.9 times, and the average value of the compressive strength was 29.1N , with better 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 invention belongs to the technical field of resource recycling of municipal sludge and ferrous metallurgical dust and sludge, and in particular provides a method for preparing sintering ingredients from municipal sludge and ferrous metallurgical dust and sludge, harmless and high added value It relates to the field of processing technology, and particularly relates to a method for preparing sintering ingredients by using urban sludge and metallurgical iron-containing dust. Background technique [0002] Municipal sludge is the product of wastewater treatment process, the forecast shows that my country's sewage discharge in 2010 will reach 4.40×10 10 t / a, reached 5.36×10 in 2020 10 t / a. The amount of sludge usually accounts for 0.3-0.5% of the amount of sewage, accounting for about 1-2% of the amount of sewage treatment. If advanced treatment, the amount of sludge will increase by 0.5-1 times. Compared with foreign countries, my country's sewage tr...

Claims

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Application Information

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Patent Type & Authority Patents(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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