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Method for sludge treating and ferrous metallurgy dust removal through metallurgical sintering process

A technology of iron and steel metallurgy and sludge, which is applied in the field of waste resource utilization, can solve the problems of improper disposal of iron and steel metallurgy dust, and achieve the effect of resource utilization, low FeO, and improved quality

Inactive Publication Date: 2018-05-25
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly solve the environmental and social problems caused by improper disposal of urban sludge and iron and steel metallurgical dust

Method used

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  • Method for sludge treating and ferrous metallurgy dust removal through metallurgical sintering process
  • Method for sludge treating and ferrous metallurgy dust removal through metallurgical sintering process

Examples

Experimental program
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Embodiment 1

[0088] A method for treating sludge using a metallurgical sintering process, the method comprising the following steps:

[0089] (A) Sludge pretreatment step: dewatering the sludge produced by direct separation of urban sewage by pressure filtration to obtain dehydrated sludge with a water content of about 21wt%;

[0090] (B1) Step of removing non-free water: mixing and reacting quicklime and dehydrated sludge to obtain a sludge mixture, wherein the weight ratio of quicklime to dehydrated sludge is 1:2;

[0091] (C1) Dosing step: mix 10 parts by weight of the obtained sludge mixture with 190 parts by weight of sintering raw materials to obtain a sintering mixture; wherein the sintering raw materials include 67wt% iron ore fine powder for sintering, 26wt% Flux (1:1 weight ratio of dolomite and limestone), 7% anthracite powder, said weight ratio is based on the total weight of sintered raw materials; wherein: the amount of sludge mixture is 5wt%, and this weight percentage is ba...

Embodiment 2

[0097] Repeat embodiment 1, just replace the sludge that produces through the direct separation of urban sewage with the sludge that produces in the sewage treatment process; Add a small amount of water (that is, wet amount, i.e. 8wt%, based on the sintered mixture) in a mix total weight); in step (A), the sludge is dewatered by centrifugation.

Embodiment 3

[0099] Repeat embodiment 1, only the sludge that produces in the sludge directly separated from municipal sewage and the sludge produced in the sewage treatment process replaces the sludge produced directly through municipal sewage; In the step (B1), the weight of unslaked lime and the sludge after dehydration The ratio is 1:3.

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Abstract

The invention discloses a method for sludge treating through a metallurgical sintering process. The method comprises following steps: A, sludge pre-treatment, specifically, sludge is subjected to water removal; B1, non-free water removal, specifically, quick lime and the sludge subjected to water removal are mixed and have a reaction, and a sludge mixture is obtained; C1, burdening, specifically,the obtained sludge mixture and other raw materials are mixed uniformly, and a sintering mixture is obtained; D, blending and granulation, specifically, the sintering mixture is subjected to primary mixing and secondary mixing through a mixing machine to obtain a sintering blending material; and E, sintering, specifically, the sintering blending material is put into a sintering machine trolley tobe sintered. Effective chemical components in sewage sludge and ferrous metallurgy dedusting ash are used for metallurgy sintering, and resource utilization is achieved.

Description

technical field [0001] The invention relates to the field of resource utilization of waste, in particular to a method for treating urban sludge and iron and steel metallurgical dust by using a metallurgical sintering process. It mainly solves the environmental and social problems caused by improper disposal of urban sludge and iron and steel metallurgical dust. Background technique [0002] Municipal sludge is a product in the process of urban sewage treatment, part of which is produced by the direct separation of sewage, and the other part is produced in the process of sewage treatment. In recent years, urban sewage treatment has developed rapidly, and the total amount of urban sludge has also 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 sludge problem in the cities of the national team has been paid more and more attention. The goal of sludge t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C02F11/14
CPCC22B1/16C02F11/14
Inventor 周志安叶恒棣刘水石王菊香李康代友训
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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