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Method and system for comprehensively using steel smelting furnace slag resources, and blast furnace slag pot

A technology for iron and steel smelting and blast furnace slag, which is applied in the direction of recycling technology and process efficiency improvement. It can solve the problems of no follow-up process system, high phosphorus content in molten iron, poor applicability, etc., and achieve convenient follow-up processing procedures, efficient recycling, The effect of easy operation

Inactive Publication Date: 2020-12-15
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction reaction of this method consumes a large amount of heat, and the reduced molten iron has a high phosphorus content, which has poor applicability; this method does not propose a follow-up process system that can effectively promote the pulverization of slag

Method used

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  • Method and system for comprehensively using steel smelting furnace slag resources, and blast furnace slag pot
  • Method and system for comprehensively using steel smelting furnace slag resources, and blast furnace slag pot
  • Method and system for comprehensively using steel smelting furnace slag resources, and blast furnace slag pot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] use as figure 1 As shown in the process flow, the slag is proportionally: blast furnace slag: converter slag: desulfurization slag: refining slag = 2:3:0.5:0.4, liquid steel slag is mixed into the blast furnace slag pot containing molten blast furnace slag, and poured into it Added 85kg / t 高炉渣 Silica bricks; cover the blast furnace slag tank after feeding, and the tank cover is connected with a gas-compressed air burner; hoist the blast furnace slag tank into the insulation pit and cover it; mix the slag in the blast furnace slag tank through the burner The heating time is 40 minutes to ensure that the slag mixture is kept at 1150-1250 ° C for 2 hours; stop the heating, and after the modified slag is cooled slowly for 20 hours, lift the blast furnace slag pot and pour the modified slag into the slag At the same time, the dust removal device above the slag pit is opened; finally, the modified slag cooled to room temperature is crushed, screened and magnetically separated...

Embodiment 2

[0080] use as figure 1 As shown in the process flow, the above-mentioned slag is proportionally: blast furnace slag: converter slag: desulfurization slag: refining slag = 1:1:0.6:0.5, the liquid steel slag is mixed into the blast furnace slag tank filled with molten blast furnace slag, and Among them, 60kg / t is added 高炉渣 Clay bricks; cover the blast furnace slag tank after feeding, and the tank cover is connected with a gas-compressed air burner; hoist the blast furnace slag tank into the insulation pit and cover it; mix the slag in the blast furnace slag tank through the burner The heating time is 35 minutes to ensure that the slag mixture is kept at 1150-1250°C for 2 hours; stop the heating, and after the modified slag is cooled slowly for 22 hours, lift the blast furnace slag pot and pour the modified slag into the slag At the same time, the dust removal device above the slag pit is opened; finally, the modified slag cooled to room temperature is crushed, screened and magn...

Embodiment 3

[0094] use as figure 1 As shown in the process flow, the above-mentioned slag is proportionally: blast furnace slag: converter slag: desulfurization slag: refining slag = 3:1:0.3:0.2, the liquid steel slag is mixed into the blast furnace slag tank filled with molten blast furnace slag, and Among them, 50kg / t is added 高炉渣 high alumina bricks; after the feeding is completed, cover the blast furnace slag pot with a gas-compressed air burner; hoist the blast furnace slag pot into the insulation pit and cover it; use the burner to feed the slag in the blast furnace Add heat to the mixture, and the heating time is 30 minutes to ensure that the slag mixture is kept at 1150 ° C ~ 1250 ° C for 2.5 hours; stop the heat supplement, and after the modified slag is slowly cooled for 25 hours, lift the blast furnace slag tank and put the modified slag Pour into the slag pit, and at the same time open the dust removal device above the slag pit; finally, crush, screen and magnetically separat...

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Abstract

The invention relates to the field of converter steel-making, in particular to a method and system for comprehensively using steel smelting furnace slag resources, and a blast furnace slag pot. The method for comprehensively using the steel smelting furnace slag resources comprises the following steps: adding industrial waste generated in a steel-making process into molten blast furnace slag to obtain a furnace slag mixture; conducting heat compensation and heat preservation on the furnace slag mixture to elevate the temperature of the furnace slag mixture to 1000 DEG C or above, and conducting heat preservation for 2-3 h to obtain modified furnace slag; naturally cooling the modified furnace slag in a heat preservation pit to reduce the temperature of the modified furnace slag to a room temperature; and conducting subsequent treatment on the cooled modified furnace slag. The method has the following advantages that effective components and heat values of the multiple kinds of furnaceslag can be efficiently recovered; the steel slag is modified, so that the grindability and the stability of the steel slag are improved; and steel slag and a waste fire-resistant material are recycled, so that products and technical support are provided for subsequent utilization of multiple kinds of furnace slag resources and energy generated in steel production processes and reduction of environmental pollution.

Description

technical field [0001] The invention relates to the field of converter steelmaking, in particular to a method and system for comprehensively utilizing iron and steel smelting slag resources and a blast furnace slag tank. Background technique [0002] Converter steelmaking is the most important steelmaking method at home and abroad. A large amount of blast furnace slag is produced in the upstream of the technological process, and molten iron pretreatment slag, converter slag, and molten steel refining slag are produced in the downstream; at the same time, iron and steel enterprises produce a large amount of waste refractory materials. Blast furnace slag, molten iron pretreatment slag, converter slag and refining slag are all industrial solid wastes produced in the process of converter steelmaking, of which blast furnace slag and converter slag are the largest, accounting for about 70% in total. [0003] Every ton of steel produced in the converter steelmaking process will pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08C21B3/10
CPCC21B3/06C21B3/08C21B3/10C21B2400/026C21B2400/068C21B2400/072C21B2400/08Y02W30/50Y02P10/20
Inventor 张芳赵立杰彭军常宏涛王艺慈罗果萍
Owner INNER MONGOLIA UNIV OF SCI & TECH