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Method for utilizing blast furnace dust

A blast furnace gas ash and a gas ash technology are applied in the field of using blast furnace gas ash, and can solve the problems of blast furnace stability hazards, high cost, limited amount of blast furnace gas ash briquette balls, etc.

Inactive Publication Date: 2010-08-18
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to preliminary statistics, my country produces about 4 million tons of high-gas ash every year. Since the gas ash contains high zinc content, if it is returned to the sintering system, it will increase the zinc load of the blast furnace, which will bring great harm to the stability of the blast furnace; The ash can be reused after dezincification and other treatments, but whether it is pyrolysis or wet treatment, the general cost is high, and the gain outweighs the loss; the steelmaking process needs to digest the dust generated by itself, and the amount of blast furnace gas ash pressure balls is extremely limited, and Therefore, how to use blast furnace gas ash economically and rationally has become an important problem for metallurgical enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] The technological process of the present embodiment is as follows:

[0021] Loading→feeding→reduction→cooling→magnetic separation.

[0022] The method of utilizing blast furnace gas ash is the following steps in sequence:

[0023] I charge

[0024] Put 3t of blast furnace gas ash into Putong's injection machine;

[0025] Main ingredients of gas ash:

[0026] TF

Feo

SiO2

Al2O3

CaO

MgO

Na2O

K2O

Zn

28～45％

2～6％

4～9％

2～4％

2～5％

1～3％

0.1～0.5％

0.3～％0.9

0.2-1.0％

[0027] II feeding

[0028] In the slag removal process of smelting carbon steel, gas ash is continuously added to steel slag, the temperature of steel slag is 1650°C, the amount of steel slag added to slag steel is 20t, and the amount of gas added is 2t, which are added simultaneously with steel slag;

[0029] III reduction

[0030] In the slag pot, the sensible heat of the steel slag is used to reduce the blast furnac...

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Abstract

The invention relates to a method for utilizing blast furnace dust, which sequentially comprises the following steps: 1. material loading: loading the blast furnace dust into a spray blowing machine; 2. material addition: adding the blast furnace dust into steel slag in the steelmaking tapping process, wherein the temperature of the steel slag is between 1650 DEG C and 1750 DEG C, and the steel slag and the blast furnace dust have the mass part ratio of 12 to 25 of steel slag and 1 to 3 of blast furnace dust; 3. reduction: carrying out the reduction on the blast furnace dust in a slag pot by using the sensible heat of the steel slag with the reduction time between 60 and 90 minutes; 4. cooling: cooing the steel slag for 8 to 24 hours; and 5. magnetic separation: realizing the steel and slag separation through the magnetic separation for separating out slag steel used for steelmaking. The method for utilizing the blast furnace dust of the invention has the advantages of short technical process and low treatment cost.

Description

technical field [0001] The invention relates to a method for utilizing blast furnace gas ash. Background technique [0002] my country's steel production has ranked first in the world for seven consecutive years. With the further increase of steel production, the secondary resources produced have also increased significantly. According to preliminary statistics, my country produces about 4 million tons of high-gas ash every year. Since the gas ash contains high zinc content, if it is returned to the sintering system, it will increase the zinc load of the blast furnace, which will bring great harm to the stability of the blast furnace; The ash can be reused after dezincification and other treatments, but whether it is pyrolysis or wet treatment, the general cost is high, and the gain outweighs the loss; the steelmaking process needs to digest the dust generated by itself, and the amount of blast furnace gas ash pressure balls is extremely limited, and Therefore, how to use bla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/06
Inventor 樊锰辉王立新史永林叶成文仪桂兰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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