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Method for efficiently recovering dust sludge containing C and Fe in iron and steel industry

A technology of iron and steel industry, dust and mud, applied in the direction of petroleum industry, recycling technology, chemical instruments and methods, etc., can solve the problems of waste, low recycling rate, etc., and achieve the effect of complete combustion, efficient recovery, and high heat

Inactive Publication Date: 2015-04-08
LIUZHOU XIANMING SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following weak points in these recycling methods to dust mud: recycling rate is low, and waste is serious

Method used

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  • Method for efficiently recovering dust sludge containing C and Fe in iron and steel industry

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Effect test

Embodiment 1

[0037] A method for efficiently reclaiming iron and steel industry dust sludge containing C and Fe, the method is to carry out magnetic separation after screening and crushing the dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel industry to obtain Ca, Si powder and Fe-containing materials, Fe-containing materials are returned to the steelmaking plant for use, C, Ca, Si powders are continuously flotation, and high-C materials are obtained by flotation. After the high-C materials are air-dried, turpentine is added for cementation , and then pressed into a spherical or rod shape, and after air-drying, the lipid coke used as a reducing agent and fuel in the smelting industry can be obtained. The method includes the following specific steps:

[0038] A. Screening:

[0039] The dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel plant is screened by a vibrating screen. In the dust sludge containing C, Fe, Ca, Si and other im...

Embodiment 2

[0055] A method for efficiently reclaiming iron and steel industry dust sludge containing C and Fe, the method is to carry out magnetic separation after screening and crushing the dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel industry to obtain Ca, Si powder and Fe-containing materials, Fe-containing materials are returned to the steelmaking plant for use, C, Ca, Si powders are continuously flotation, and high-C materials are obtained by flotation. After the high-C materials are air-dried, turpentine is added for cementation , and then pressed into a spherical or rod shape, and after air-drying, the lipid coke used as a reducing agent and fuel in the smelting industry can be obtained. The method includes the following specific steps:

[0056] A. Screening:

[0057] The dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel plant is screened by a vibrating screen. In the dust sludge containing C, Fe, Ca, Si and other impu...

Embodiment 3

[0073] A method for efficiently reclaiming iron and steel industry dust sludge containing C and Fe, the method is to carry out magnetic separation after screening and crushing the dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel industry to obtain Ca, Si powder and Fe-containing materials, Fe-containing materials are returned to the steelmaking plant for use, C, Ca, Si powders are continuously flotation, and high-C materials are obtained by flotation. After the high-C materials are air-dried, turpentine is added for cementation , and then pressed into a spherical or rod shape, and after air-drying, the lipid coke used as a reducing agent and fuel in the smelting industry can be obtained. The method includes the following specific steps:

[0074] A. Screening:

[0075] The dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel plant is screened by a vibrating screen. In the dust sludge containing C, Fe, Ca, Si and other im...

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Abstract

The invention provides a method for efficiently recovering dust sludge containing C and Fe in the iron and steel industry and relates to a dust sludge recovering method in the iron and steel industry. According to the method, the dust sludge containing C, Fe, Ca, Si and other impurities in the iron and steel industry is screened, crushed, magnetically separated and then selected in a flotation manner to get a high-C-content material, the high-C-content material is added with rosin for lipidation and cementation after being air-dried, then is compressed into the ball or rod shape, and is air-dried to get lipidation coke used as a reducer and fuel in the smelting industry. The method can efficiently recover C and Fe, the yield of the C-containing material is high, the burning is more thorough and sufficient, the heat efficiency is higher, and the method facilitates popularization and application.

Description

technical field [0001] The invention relates to a method for recovering iron and steel industry dust and sludge, in particular to a method for efficiently recovering iron and steel industry dust and sludge containing C and Fe. Background technique [0002] In recent years, my country's iron and steel industry has developed rapidly. According to statistics, my country's crude steel output reached 570 million tons in 2009, accounting for nearly 47% of the global total. However, the amount of dust and sludge produced in the iron and steel industry is 1% to 1.5% of the steel output. These dust and sludge contain some elements harmful to human health. If they are not treated, they will not only cause air pollution, but also water pollution and Soil pollution, therefore, the use of various methods to deal with dust and sludge has been paid more and more attention. At present, the main research on the recycling process of dust and mud is how to recycle Fe, but C is not recycle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/04B03C1/02B03D1/00C10L5/48
CPCY02W30/50
Inventor 张仲明莫如贤
Owner LIUZHOU XIANMING SCI & TECH
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