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A kind of environment-friendly slag modifier and preparation method thereof

A modifier and an environmentally friendly technology, applied in the manufacture of converters, etc., can solve the problems of excessive loss of aluminum in contact with air, aggravate environmental pollution, and failure to meet environmental protection requirements, so as to reduce the amount of impurities brought in and improve the quality of slag. Degree, enhance the effect of adsorption inclusion capacity

Active Publication Date: 2021-06-22
鞍钢实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different materials used and the characteristics of the product particles, different defects were shown during the use process, which are summarized as follows: ①CaO+CaF 2 The base cannot fundamentally solve the problem of high oxidation of slag, and cannot be used in high-quality steel smelting; ②CaC 2 The phenomenon of carburization of molten steel occurs during the use of the base, which is not suitable for low-carbon and ultra-low-carbon steel grades; ③The traditional Al-based ladle slag modifier has a small particle size due to the addition of Al materials in the product, and is affected by the rise of the hot air flow on the molten steel surface. The reaction rate is low and the reaction time is short and the reaction is too intense, resulting in concentrated removal of smoke and aggravating environmental pollution; ④ Due to the composition of raw materials, the product density is small, and most of it floats on the surface of steel slag when it is added to ladle slag, resulting in relatively low contact between aluminum and air. Many losses are serious, resulting in waste of resources; ⑤The raw materials are mostly raw materials without pre-melting treatment, and the content of gas-generating substances is high, resulting in a large amount of smoke and dust during use, which seriously pollutes the environment and cannot meet environmental protection requirements

Method used

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Examples

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preparation example Construction

[0022] A preparation method of an environment-friendly slag modifier, comprising the steps of:

[0023] 1) Mix the manganese powder and iron powder in proportion and put them into the material tank evenly through the screw mixer;

[0024] 2) Passivated lime powder is loaded into another feed tank;

[0025] 3) Put the above two kinds of material tanks on the position of feeding the core wire core material, and add each material in proportion to the pre-deformed aluminum strip;

[0026] 4) Through the core wire machine, the material is coated and pressurized and transferred to the shearing machine, and cut and compacted into finished particles according to the specifications.

[0027] The cross-sectional size of the finished granule is φ=9-15mm, and the length of the finished granule is 30-40mm.

[0028] Mn in the manganese powder is ≥ 99wt%; the particle size of the manganese powder is ≤ 2mm; the addition ratio of the manganese powder is 4wt% to 14wt%;

[0029] Fe in iron po...

Embodiment 1

[0033] A preparation method of an environment-friendly slag modifier, comprising the steps of:

[0034] 1) Mix the manganese powder and iron powder in proportion and put them into the material tank evenly through the screw mixer;

[0035] 2) Passivated lime powder is loaded into another feed tank;

[0036] 3) Put the above two kinds of material tanks on the position of feeding the core wire core material, and add each material in proportion to the pre-deformed aluminum strip;

[0037] 4) Through the core wire machine, the material is coated and pressurized and transferred to the shearing machine, and cut and compacted into finished particles according to the specifications.

[0038] The cross-sectional size of the finished granule is φ=10mm, and the length of the finished granule is 35mm.

[0039] Mn 99wt% in the manganese powder; the particle size of the manganese powder is ≤2mm; the addition ratio of the manganese powder is 6wt%;

[0040] Fe 93.2wt% in the iron powder; ir...

Embodiment 2

[0045] A preparation method of an environment-friendly slag modifier, comprising the steps of:

[0046] 1) Mix the manganese powder and iron powder in proportion and put them into the material tank evenly through the screw mixer;

[0047] 2) Passivated lime powder is loaded into another feed tank;

[0048] 3) Put the above two kinds of material tanks on the position of feeding the core wire core material, and add each material in proportion to the pre-deformed aluminum strip;

[0049] 4) Through the core wire machine, the material is coated and pressurized and transferred to the shearing machine, and cut and compacted into finished particles according to the specifications.

[0050] The cross-sectional size of the finished granule is φ=13 mm, and the length of the finished granule is 40 mm.

[0051] Mn 99wt% in the manganese powder; the particle size of the manganese powder is ≤2mm; the addition ratio of the manganese powder is 8wt%;

[0052] Fe 94.7wt% in the iron powder; ir...

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Abstract

An environment-friendly slag modifier and a preparation method thereof. The components and mass percentages of the environment-friendly slag modifier are: Al 30%-40%, CaO 18%-27%, Mn 4%-14% %, Fe 27% to 36%, and the rest are unavoidable impurities. When the invention is used, it has no smoke and dust, does not pollute the environment, improves the alkalinity of slag, and absorbs inclusions to create favorable conditions for smelting clean molten steel. In the present invention, the three measures of replacing detritus-shaped aluminum grains with aluminum strips, adding manganese powder and iron powder, and adding passivated lime powder effectively solve the problems of large smoke and dust of the original product, pollute the working environment, and low aluminum utilization rate, and realize efficient deoxidation improvement. quality; add passivated lime powder to increase the alkalinity of slag, enhance its ability to absorb inclusions, and effectively solve the problem of molten steel inclusions affecting the quality of steel; use core wrapping machines and shearing machines to coat and shear and compact materials to achieve different Adding binder is the goal of forming, reducing the amount of impurities brought in, which is conducive to the production of clean steel.

Description

technical field [0001] The invention relates to an auxiliary material in the field of steelmaking, in particular to an environment-friendly slag modifier and a preparation method thereof. Background technique [0002] In recent years, with the increasing demand for high-performance and high-quality steel products in all walks of life, especially the development of high-quality steel products such as IF steel, pipeline steel, and O5 steel plates for automobiles, the requirements for the cleanliness of molten steel are getting higher and higher. In order to smelt clean molten steel that meets the requirements, eliminating and controlling highly oxidizing slag is one of the key links, and it is also one of the key technologies for high refining efficiency. In order to control and eliminate highly oxidizing slag, steel mills generally adopt slag blocking and tapping to control the amount of slag, but some slag still enters the ladle with molten steel from the converter, and thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36C21C7/06C21C7/064
Inventor 李学慧梁荣山张世平刘梦野王汝家陈云鹏佟伟
Owner 鞍钢实业集团有限公司