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Method for online production of sponge iron by using steel residue waste heat

A technology of sponge iron and steel slag, applied in the field of steelmaking environmental protection, can solve the problems of low recovery rate of steel slag waste heat, unutilized steel slag waste heat, and insufficient utilization, etc., so as to improve the recovery rate and value, improve utilization efficiency, and reduce The effect of production costs

Inactive Publication Date: 2013-01-02
杨龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, most iron and steel enterprises have not utilized the waste heat of steel slag, and have used natural cooling, crushing, screening, and magnetic separation to directly process steel slag, and the recycling rate of steel slag waste heat is extremely low; Power generation or heat supply, but not very efficient and not widely used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method for generating sponge iron on-line by utilizing waste heat of steel slag comprises the following steps:

[0020] 1) First mix 1 ton of rolled steel oxide scale (72.1% iron grade) and 0.1 ton of pulverized coal evenly, and then put it into a high temperature resistant reaction tank;

[0021] 2) Pour the steel slag in the steelmaking furnace into the slag tank, and then place the high-temperature-resistant reaction tank on the surface of the steel slag in the slag tank, so that the residual heat of the steel slag is transferred to the high-temperature-resistant reaction tank. During the natural cooling of the steel slag from 1700 ° C, the rolling steel is oxidized The iron sheet and coal powder are heated for 1 hour to generate redox reaction to form sponge iron;

[0022] 3) Remove the high-temperature-resistant reaction tank from the slag tank, and take out the sponge iron, and then undergo physical treatments such as cooling-crushing-magnetic separation-briqu...

Embodiment 2

[0025] The method for generating sponge iron on-line by utilizing waste heat of steel slag comprises the following steps:

[0026] 1) First mix 1 ton of rolled steel oxide scale (72.1% iron grade) and 0.5 ton of pulverized coal evenly, and then put it into a high temperature resistant reaction tank;

[0027] 2) Pour the steel slag in the steelmaking furnace into the slag pot, and then place the high-temperature resistant reaction tank on the surface of the steel slag in the slag tank, so that the residual heat of the steel slag is transferred to the high-temperature resistant reaction tank. During the natural cooling of the steel slag from 1600 ° C, the rolling steel is oxidized The iron sheet and coal powder are heated for 6 hours to undergo redox reaction to form sponge iron;

[0028] 3) Remove the high-temperature-resistant reaction tank from the slag tank, and take out the sponge iron, and then undergo physical treatments such as cooling-crushing-magnetic separation-brique...

Embodiment 3

[0031] The method for generating sponge iron on-line by utilizing waste heat of steel slag comprises the following steps:

[0032] 1) Mix 1 ton of rolled steel oxide scale (72.1% iron grade) and 1 ton of pulverized coal evenly, and then put it into a high temperature resistant reaction tank;

[0033] 2) Pour the steel slag in the steelmaking furnace into the slag pot, and then place the high-temperature-resistant reaction tank on the surface of the steel slag in the slag tank, so that the residual heat of the steel slag is transferred to the high-temperature-resistant reaction tank. During the natural cooling of the steel slag from 1500 ° C, the rolling steel is oxidized The iron sheet and coal powder are heated for 10 hours to undergo redox reaction to form sponge iron;

[0034] 3) Remove the high-temperature-resistant reaction tank from the slag tank, and take out the sponge iron, and then undergo physical treatments such as cooling-crushing-magnetic separation-briquetting t...

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PUM

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Abstract

The present invention discloses a method for online production of sponge iron by using steel residue waste heat. The method comprises the following steps: 1) uniformly mixing raw materials and a reducing agent according to a weight percentage ratio of 1:0.1-1, and filling the resulting mixed material into a high temperature resistance reaction tank; 2) pouring steel residue of a steelmaking furnace into a residue tank, then placing the reaction tank on the surface of the residue tank steel residue or sinking the reaction tank portion into the steel residue, such that the steel residue waste heat is transferred to the high temperature resistance reaction tank, and the raw materials and the reducing agent in the high temperature resistance reaction tank are heated, and subjected to an oxidation reduction reaction to produce the sponge iron. According to the present invention, the steel residue waste heat is completely utilized, and the waste material is adopted to produce the sponge iron during the normal treatment process of the steelmaking steel residue, such that steel residue waste heat utilization efficiency is effectively improved, recovery utilization rate and value of the waste material are substantially improved, steelmaking cost and sponge iron production cost are reduced, characteristics of extremely low investment, simple operation, convenient performing, energy saving, emission reduction, high finished iron grade, and the like are provided, and the method can be applicable for promotion and application in iron and steel enterprises with various types and various sizes.

Description

technical field [0001] The invention belongs to the technical field of steelmaking environmental protection, and in particular relates to a method for on-line generation of sponge iron by using waste heat of steel slag, that is, recycling of secondary resources while recycling of secondary energy. Background technique [0002] Although the utilization of waste heat from steel slag in the iron and steel industry started early, the effect was not great. So far, most iron and steel enterprises have not utilized the waste heat of steel slag, and have used natural cooling, crushing, screening, and magnetic separation to directly process steel slag, and the recycling rate of steel slag waste heat is extremely low; Power generation or heat supply, but the efficiency is not high, and the utilization is not wide. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for generating sponge iron online by utilizing the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/04C21B3/04F27D17/00
CPCY02P10/20Y02P10/25Y02W30/50
Inventor 杨龙
Owner 杨龙
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