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Method for recycling aluminum ash as steelmaking deoxidation slag former

A technology of slagging agent and aluminum ash, applied in the direction of improving process efficiency, etc., can solve problems such as poor deoxidation and desulfurization effect, reduced deoxidation effect, metal aluminum oxidation, etc., to meet the requirements of silo storage and automatic feeding mode, and improve the ecological environment , the effect of reducing the burden

Inactive Publication Date: 2021-08-10
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Application Information

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Problems solved by technology

[0005] Patent CN107739776A discloses a calcium-aluminum composite deoxidizer, which melts aluminum ash, white ash and magnesium through an electric furnace to solve the problems of burning dust and poor deoxidation and desulfurization effects when the existing calcium-aluminum composite deoxidizer is added to molten steel
However, the melting of aluminum ash will inevitably cause the oxidation of aluminum in the aluminum ash, reducing the deoxidation effect.

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  • Method for recycling aluminum ash as steelmaking deoxidation slag former

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Embodiment 1

[0027] The main components of aluminum ash after air-drying in the aluminum ash yard are calculated by mass percentage: Al: 28-35%, Al 2 o 3 : 46-58%, SiO 2 : 3-7%. The ratio of aluminum ash to added limestone is 1:1.7, and it is made into fine particles of ≤5mm by a pulverizer. After adding binder and water, stir it evenly in a mixer. Water is added in the form of a spray at a rate of 2%. The mixed raw materials are pressed into balls by a high-pressure molding machine, and after drying, they are used as deoxidizing slagging agents in the steelmaking process.

[0028] By calculation, the composition of the deoxidizing slagging agent is calculated by mass percentage: Al: 10.4-13%, Al 2 o 3 : 17-21.5%, SiO 2 : 1.1-2.6%, CaO: 32.7%. Before tapping the converter, add 30% deoxidizing slagging agent to the ladle, and add the rest when tapping 20%. The amount of deoxidizing slagging agent added is 5.4kg / t, and the dynamic conditions during tapping are used to quickly form sla...

Embodiment 2

[0030] The main components of aluminum ash after air-drying in the aluminum ash yard are calculated by mass percentage: Al: 28-35%, Al 2 o 3 : 46-58%, SiO 2 : 3-7%. The ratio of aluminum ash to added limestone is 1:1.9, and it is made into fine particles of ≤5mm by a pulverizer. After adding binder and water, stir it evenly in a mixer. Water is added in the form of a spray at a rate of 2%. The mixed raw materials are pressed into balls by a high-pressure molding machine, and after drying, they are used as deoxidizing slagging agents in the steelmaking process.

[0031] By calculation, the composition of the deoxidizing slagging agent is calculated by mass percentage: Al: 9.7-12.1%, Al 2 o 3 : 15.9-20%, SiO 2 : 1-2.4%, CaO: 34.1%. Before tapping the converter, add 30% deoxidizing slagging agent to the ladle, and add the rest when tapping 20%. The amount of deoxidizing slagging agent added is 6kg / t, and the dynamic conditions during tapping are used to form slag quickly. ...

Embodiment 3

[0033] The main components of aluminum ash after air-drying in the aluminum ash yard are calculated by mass percentage: Al: 28-35%, Al 2 o 3 : 46-58%, SiO 2 : 3-7%. The ratio of aluminum ash to added limestone is 1:2.1, and it is made into fine particles of ≤5mm by a pulverizer, and after adding binder and water, stir it evenly in a mixer. Water is added in the form of a spray at a rate of 2%. The mixed raw materials are pressed into balls by a high-pressure molding machine, and after drying, they are used as deoxidizing slagging agents in the steelmaking process.

[0034] By calculation, the composition of the deoxidizing slagging agent is calculated by mass percentage: Al: 9-11.3%, Al 2 o 3 : 14.8-18.7%, SiO 2 : 1-2.3%, CaO: 35.2%. Before tapping the converter, add 30% deoxidizing slagging agent to the ladle, and add the rest when tapping 20%. The amount of deoxidizing slagging agent added is 5.8kg / t, and the kinetic conditions during tapping are used to form slag qui...

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Abstract

The invention discloses a method for recycling aluminum ash as a steelmaking deoxidation slag former. The aluminum ash is scum generated in an aluminum electrolysis process, the air-dried aluminum ash is added with limestone and then ground into fine particles, the fine particles are uniformly stirred with a binder and water, and the deoxidation slag former is prepared after extrusion forming by using a mold and drying treatment. In the tapping process, a deoxidizing slag former is added in batches, slag is formed quickly by utilizing dynamic conditions during tapping, and the oxygen content in steel is reduced. According to the method, molten steel is deoxidized and slagging is performed by using metal aluminum and oxides thereof in the aluminum ash so that the burden of the aluminum manufacturing industry can be reduced, the economic benefit of a steel mill can be improved, the ecological environment can be improved, and the method has important practical significance.

Description

technical field [0001] The invention relates to a method for reusing aluminum ash as a deoxidizing slagging agent in steelmaking, and belongs to the field of comprehensive utilization of waste in the steelmaking process. Background technique [0002] In the process of aluminum electrolysis, in order to prevent the oxidation of primary aluminum, fluoride chloride is usually added as a purifying agent or covering agent. The flux has a strong ability to absorb and dissolve, and the scum formed after the floating and dissolving of alumina and other impurities is called aluminum ash. Aluminum ash is mainly divided into primary aluminum ash and secondary aluminum ash. Primary aluminum ash is the aluminum slag produced in the process of producing aluminum from primary aluminum, and its main components are metallic aluminum and aluminum oxide. In order to extract the high-value metal aluminum in primary aluminum ash, technologies such as frying ash, pressing and recycling, and ball...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
CPCC21C7/06Y02P10/20
Inventor 张康晖马建超李强赵家七
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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