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Method for preparing slagging scrap by using steel-making waste residue

A technology for steel-making waste slag and steel slag, which is applied in the direction of manufacturing converters, recycling technology, chemical instruments and methods, etc., can solve the problems of pollution, waste, increase costs, etc., and achieve the effects of avoiding smoke pollution, reducing dosage, and reducing pollution.

Inactive Publication Date: 2010-04-14
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only waste, but also occupy land, causing pollution
However, the smelting and slag-forming scrap steel in the steelmaking plant uses iron nuggets plus purchased scrap steel, which increases the cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0008] Pour the steel slag after 5-6 hours out of the furnace into a hot braising furnace with a water cooling device, cover it and heat it up for cooling, and when it reaches room temperature, the steel slag becomes fine particles. Transport to the slag yard for screening and magnetic separation. The mesh of the sieve is 15 cm. The steel slag that has not been screened and coarse particles is returned for heat treatment, and the screened steel slag is transported to the first magnetic separation drum for magnetic separation through a belt, and the steel slag with an iron content of about 70%-80% is obtained, and the remaining material is After passing through the second strong magnetic separation drum, the steel slag with iron content grade of about 40%-50% is obtained, and the final remaining material is ground by a ball mill, and the iron-containing metal material is selected by the magnetic separator, and the iron-containing metal material is obtained. The grade of iron c...

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PUM

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Abstract

The invention relates to a method for preparing slagging scrap by using steel-making waste slag, which comprises the following steps: pouring slag which is discharged 5-6h ago into a heat soaking furnace with a water-cooling device, covering for heat soaking and cooling, enabling the slag to become fin granules after reaching room temperature, discharging, conveying the slag processed by the heat soaking furnace to a slag yard by a vehicle or belt for sieving and magnetically separating, returning the slag with thick granules which do not pass through a sieve for heat soaking; conveying the sieved slag to a first magnetic separation roller by the belt for magnetically separating to obtain magnetically separated slag, enabling residue to pass through a second strong magnetic separation roll to obtain magnetically separated slag, leading the last residue to pass through a ball mill for fine milling; selecting out metal charges containing iron by a magnetic separator to obtain magnetically separated slag powder, and collecting the magnetically separated slag and the magnetically separated slag powder to obtain the slagging scrap. The invention can reduce the pollution of the slag waste and molten iron pouring to the environment.

Description

technical field [0001] The invention relates to a method for preparing slag-making scrap steel by using steelmaking waste slag. Background technique [0002] Steel-making slag contains about 15% iron oxide, and a part of molten steel is brought out during slag dumping. At present, steel slag in steel-making plants is mostly discarded. It is not only wasteful, but also takes up land and causes pollution. However, the smelting and slag-making scrap steel in the steelworks uses iron nuggets plus purchased scrap steel, which increases the cost. Invention content: [0003] In order to overcome the disadvantages of the prior art, the invention provides an environment-friendly converter steelmaking method, which can reduce environmental pollution caused by waste steel slag and pouring of molten iron. [0004] The technical solution adopted by the present invention to solve the technical problem is: pour the steel slag after 5-6 hours out of the furnace into a hot furnace with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21C5/36C21C5/54C21C7/076B03C1/10
CPCY02P10/20Y02W30/50
Inventor 刘明忠张同波李宝赞杨明生吴国庆张亚彬侯魏张文新张旭朝汪国奉
Owner XINXING DUCTILE IRON PIPES CO LTD