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Method for producing molten iron by adding scrap steel into blast furnace

A technology for scrap steel and molten iron, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as complex components, achieve the effects of strengthening air permeability and liquid permeability, increasing temperature, and increasing reaction speed

Active Publication Date: 2019-08-16
德龙钢铁有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For steel scrap, according to the general consensus and common name in this field, it is mainly divided into social scrap and in-factory scrap. In-factory scrap is mainly the cut ends produced in the process of producing steel products in steel factories, and its composition is relatively definite and simple, that is, its composition Basically, it is the composition of steel; and the scrap steel other than the scrap steel in the factory is social scrap steel, because the social scrap steel is generally recycled as a whole after the steel and other substances are fixed into a specific product, so the social scrap steel is usually fixed together with other materials Recycled (for example, recycled car panels are a combination of steel and paint on the steel surface. Even though most of the paint is powdered and removed during extrusion or crushing, there is still a certain amount of residue), so the composition is relatively complex

Method used

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  • Method for producing molten iron by adding scrap steel into blast furnace
  • Method for producing molten iron by adding scrap steel into blast furnace
  • Method for producing molten iron by adding scrap steel into blast furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for adding steel scrap to a blast furnace to produce molten iron, comprising the steps of:

[0038](1) Ingredients: the massive steel scrap in the first steel scrap material is crushed by a crushing machine and then screened, and the light and thin steel scrap in the first steel scrap material is screened after being pressed, and is respectively screened into 9-12mm, 5-8mm, and less than 5mm (grains greater than 15mm return to re-crushing), wherein the first steel scrap material less than 5mm is re-agglomerated and screened for use. The first scrap material is a mixture of 18 parts by weight of social scrap and 70 parts by weight of factory scrap.

[0039] After crushing and pressing the first steel scrap with an equivalent diameter of 9-12mm and small cokes with a diameter of 5-10mm are mixed according to the weight ratio of 58:16, the lower layer in the first material tank is the first steel scrap The upper layer is mixed with small cokes to obtain the first...

Embodiment 2

[0049] A method for adding steel scrap to a blast furnace to produce molten iron, comprising the steps of:

[0050] (1) Batching: the massive steel scrap in the first steel scrap material is screened after crushing by a crushing machine, and the light and thin steel scrap in the first steel scrap material is screened after being pressed, and is respectively screened into 8-15mm, 5- 8mm and not including 8mm, and less than 5mm (in which the particles larger than 15mm are returned to be broken again), wherein the first steel scrap particles smaller than 5mm are re-agglomerated and then sieved for use. After crushing and pressing the first steel scrap with an equivalent diameter of 8-15mm and small cokes with a diameter of 5-10mm are mixed according to the weight ratio of 56:20, the lower layer in the first material tank is the first steel scrap The upper layer is mixed with small coke to obtain the first mixture; the equivalent diameter after crushing and pressing is 5-8mm and d...

Embodiment 3

[0059] A method for adding steel scrap to a blast furnace to produce molten iron, comprising the steps of:

[0060] (1) Batching: After crushing and pressing the first steel scrap material with an equivalent diameter of 8-15mm and small cokes with a diameter of 5-10mm according to the weight ratio of 59:29, the following layer in the first material tank The first mixed material is obtained by mixing the upper layer of the first steel scrap with small cokes; the crushed and pressed first steel scrap with an equivalent diameter of 5-8mm and the small cokes with a diameter of 5-10mm are obtained in parts by weight 63:28 After batching, in the second material tank, the lower layer is the first steel scrap and the upper layer is small coke, and then the second mixture is obtained. The first scrap material is a mixture of 22 parts by weight of social scrap and 75 parts by weight of factory scrap.

[0061] (2) cloth: the second mixture obtained in step 1 is distributed along the mid...

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Abstract

The invention relates to a method for producing molten iron by adding scrap steel into a blast furnace. The method mainly comprises the steps of mixing, distributing, smelting, iron runner modification, iron runner distribution, molten iron ladle distribution, molten iron ladle baking and tapping and the like. According to the method, the scrap steel is added in different modes in different opportunities in a blast furnace smelting process, so that the technical effects that the overall smelting time is shortened, the tapping amount is improved, the utilization amount of the coke is greatly saved, and the downstream degree of the blast furnace and the like are improved. According to the method, the utilization rate of scarp steel can be greatly improved, more industry and domestic scarp steel can be digested, energy consumption can be reduced, emission of harmful substances is reduced, the development requirements of environmental protection and energy conservation are met, and important social benefits are achieved while the blast furnace economic benefits are increased.

Description

technical field [0001] The invention belongs to the field of blast furnace ironmaking, and in particular relates to a method for adding scrap steel to a blast furnace to produce molten iron. Background technique [0002] The blast furnace-converter process is a conventional process for smelting iron ore into steel. The use of steel scrap is mainly in the electric furnace process. However, electric furnace steelmaking requires a lot of electric energy. In the case of increasingly tight energy sources, effective use of energy and reduction The importance of environmental pollution is becoming increasingly prominent. If more scrap steel can be used in the blast furnace-converter process, on the one hand, the utilization rate of scrap steel will be greatly improved, and on the other hand, a lot of energy can be saved. Furthermore, in the blast furnace process Replacing iron ore with part of scrap steel can also reduce the emission of harmful substances and reduce environmental p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B7/14
CPCC21B5/008C21B7/14Y02P10/20
Inventor 王京彬佘雪峰王静松刘燕军刘士祯张军红刘迎立
Owner 德龙钢铁有限公司
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