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Deoxidizing alloying agent and preparation method thereof

A technology of deoxidation alloy and aluminum electrolysis, which is applied in the field of deoxidation alloy agent and its preparation, can solve the problem of not being able to improve the fluidity and adsorption of slag at the same time, and achieve the effects of being beneficial to floating removal, low energy consumption for smelting, and high deoxidation rate

Inactive Publication Date: 2017-05-31
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Such as patent application number 201410579325.X and application number 201410674753.0 and other inventions use magnesium, aluminum, iron and other metals to make steelmaking deoxidizers. The above patents are mainly based on metal alloys as deoxidizers. Aluminum, manganese and other elements, the study found that the existing deoxidation alloy agent can only achieve the effect of deoxidation, and cannot improve the fluidity of the slag system and the adsorption of phosphide, sulfide and other inclusions in molten steel by the slag system at the same time

Method used

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Examples

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Effect test

preparation example Construction

[0022] The preparation method of deoxidation alloying agent of the present invention comprises the following steps:

[0023] Step 1: Crushing, grinding and sieving the aluminum electrolysis waste lining bricks to make the particle size less than 5mm;

[0024] Step 2: Dry the aluminum electrolytic waste lining bricks obtained in Step 1 in a tunnel kiln, shaft furnace or grate rotary kiln at a temperature below 300°C. The drying time should be such that the moisture content of the lining bricks is less than the total weight of the lining. 1% to determine;

[0025] After the lining brick is cooled to normal temperature, it is packaged and sealed with a double-layer film to obtain a deoxidizing alloy agent;

[0026] When in use, the deoxidizing alloy agent of the present invention is added into the electric furnace in an amount of 6-8 g / kg (that is, 6-8 g of the deoxidizing alloy agent is added to 1 kg of molten steel).

Embodiment 1

[0029] This example provides a deoxidizing alloy agent prepared from waste lining bricks after aluminum electrolysis.

[0030] The preparation method of the deoxidation alloying agent of the present embodiment is carried out according to the following steps:

[0031] Step 1: Crushing, grinding and sieving the aluminum electrolysis waste lining bricks to make the particle size less than 5mm;

[0032] Step 2: Dry the aluminum electrolytic waste lining bricks obtained in Step 1 in a tunnel kiln, shaft furnace or grate rotary kiln at 150°C for 30 minutes; ensure that the moisture content of the lining bricks is less than the total weight of the lining bricks 1%; pack and seal the dried pellets with double-layer film.

[0033] When in use, add 300g of deoxidizing alloy agent into a 50kg electric furnace;

[0034] It is measured that, under the condition of other parameters being constant, in the slag system with basicity 3.2, the melting time of the added deoxidizing alloying age...

Embodiment 2

[0036] The deoxidation alloying agent of the present embodiment and its preparation method are identical with embodiment 1;

[0037] When in use, add 320g of deoxidizing alloying agent into a 50kg electric furnace;

[0038] It is measured that, under the condition of other parameters being constant, in the slag system with basicity 3.2, the melting time of the added deoxidizing alloying agent in molten steel is shortened by 1.8min, and the oxygen content in molten steel is reduced by 24%.

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Abstract

The invention discloses a deoxidizing alloying agent. The deoxidizing alloying agent is prepared from an aluminum electrolyte waste inner lining brick. The particle size of the aluminum electrolyte waste inner lining brick is broken to be 5 mm or less firstly, the aluminum electrolyte waste inner lining brick obtained in the step (1) is dried under the temperature below 300 DEG C till the water content of the aluminum electrolyte waste inner lining brick is smaller than 1% of the total weight of the inner lining brick, and then the deoxidizing alloying agent is obtained. According to the deoxidizing alloying agent and a preparation method thereof, the deoxidizing alloying agent is prepared from the aluminum electrolyte waste inner lining brick, the aluminum electrolyte waste inner lining brick mainly adopts a furnace slag method for deoxidizing to make quickly contact with oxygen in steel slag, thus the speed of the deoxidizing reaction is high, and the deoxidizing rate is high; and the component of the deoxidizing alloying agent is stable, meanwhile smelting energy consumption is low, and production cost is low, so that recycling for aluminum electrolyte waste silicon-carbide brick solid waste is achieved, and additional value of the solid waste is promoted.

Description

technical field [0001] The invention relates to the recycling technology of aluminum electrolysis waste lining bricks, in particular to a deoxidizing alloy agent and a preparation method thereof. Background technique [0002] The electrolytic aluminum industry is the basic industry of the national economy and plays an important role in the development of today's society. At present, my country's aluminum production ranks first in the world, exceeding 15 million tons, and it is still showing a rapid growth trend. At the same time, while aluminum electrolysis brings a large amount of valuable aluminum ingots to the national economy, it also brings pollution. The source of pollution is mainly solid waste after overhaul—waste lining, which mainly includes waste cathodes and waste lining bricks. [0003] The traditional landfill method of hazardous waste has brought great hidden dangers to the environment. At present, more than 60 electrolytic aluminum plants in my country use...

Claims

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Application Information

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IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 张朝晖冯璐任耘刘世锋
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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