A fluorine-free, carbon-free, high-alkalinity submerged arc foaming refining agent and its preparation method

A high alkalinity and refining agent technology, applied in the field of metallurgical auxiliary materials, can solve the problems of unstable foam continuous effect, weak desulfurization effect, unsatisfactory, etc., to achieve increased reaction interface and floating speed, rapid and stable slagging ability, Effect of improving arc thermal efficiency

Active Publication Date: 2014-10-15
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through long-term use and verification, and the current trend of various steels in the steel industry, it is found that there are many defects in the original slag system: 1. The foam life is short and the foaming efficiency is low; 2. The fluoride calcium slag is easy to produce volatiles under high temperature. , the continuous effect of foam is unstable, and it erodes the furnace lining, reduces the service life of the ladle, and pollutes the environment; 3. Although calcium carbide and silicon carbide can solve the above problems, they will pollute the molten steel and easily increase carbon when used on some steel types
It cannot meet the needs of developing ultra-low carbon steel; 4. Single submerged arc slagging has little effect on deoxidation and desulfurization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 2

[0014] Take 15 parts of high-calcium white ash, 45 parts of calcium carbonate, 10 parts of AD powder, 15 parts of barium carbonate, 10 parts of dolomite, and 4 parts of fused magnesia, and use the above materials to grind to 150 mesh, and measure according to the above ratio Accurate, after mixing and stirring evenly, granulate on the upper disc. During the granulation process, 10% of pulp is added according to the product weight. The pulp is super-high-concentration thick pulp from ordinary paper mills. After balling, the bottom plate is dried, and the moisture content of the product is guaranteed to be within 0.5%. The active ingredients of this product are: CaO:40.2%, MgO:5.55%, Al 2 o 3 :9.84%, BaO:9.37%, H 2 O: 0.36%, plant cellulose: 7.0%, particle size 8-15mm. The submerged arc foaming refining agent produced by this scheme is used in the trial production of low-carbon steel refining process in XX Steel Plant. The effects of submerged arc height, duration, shortening...

Embodiment example 3

[0016] Take 18 parts of high-calcium white ash, 36 parts of calcium carbonate, 16 parts of AD powder, 10 parts of barium carbonate, 18 parts of dolomite, and 2 parts of fused magnesia. Use the above materials to grind to 150 mesh, and measure according to the above ratio Accurate, after mixing and stirring evenly, granulate on the disc. During the granulation process, 12% of pulp is added according to the product weight. The pulp is super-high-concentration thick pulp from ordinary paper mills. After balling, the bottom plate is dried, and the moisture content of the product is guaranteed to be within 0.5%. The active ingredients of this product are: CaO:40.38%, MgO:5.26%, Al 2 o 3 : 17.64%, BaO: 6.33%, H 2 O: 0.1%, plant cellulose: 8.5%, particle size 10-15mm. The submerged arc foaming refining agent produced by this scheme is used in the refining process of the trial production of low-carbon and low-silicon steel in XX Steel Plant. The product has no pollution to molten ...

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Abstract

The invention discloses a fluorine-free carbon-free high-alkalinity submerged arc foaming refining agent for an LF (ladle furnace) and a preparation method thereof. The refining agent comprises the following components in percentage by weight: 20 to 60 percent of calcium oxide, 4 to 10 percent of magnesium oxide, 10 to 20 percent of aluminum oxide, 6 to 20 percent of barium oxide, and 6 to 12 percent of plant cellulose. According to the method, the raw materials are reasonably assorted, foundational slag can release gas through a high temperature decomposition reaction, and the compound with a plurality of fine pores in a polymer is of a foaming shape, the thickness of the slag layer is increased, the performance is constant and stable, the radiation of electric arc to a flame retardant material can be reduced, and the electric arc heating effect is improved. Furthermore, a proper deoxidation and desulfurization promoting agent is added in the foundational slag, so that the content of oxide in steel is reduced, carbon and silicon are not increased, the adsorption and inclusion effect is good, the refining time is shortened, and the service life of steel ladles is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgical auxiliary materials, in particular to a fluorine-free, carbon-free, high-alkalinity submerged-arc foaming refining agent for LF furnace refining and a preparation method thereof. technical background [0002] Submerged arc foaming refining agent generally refers to the use of arc heating in the ladle during the refining process of the LF furnace to achieve rapid temperature rise, adjust the composition of steel grades, coordinate the rhythm of steelmaking and continuous casting, and achieve timely slag formation and continuous and stable production. Bubbles, always good submerged arc effect during electrode heating. Reduce the erosion of the refractory material of the ladle due to the radiation of the arc, and increase the service life of the ladle. At the same time, it solves the problem that the gas generated by the contact between the arc and the surrounding air enters the molten steel, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/04
Inventor 王庆来王庆德武金波张国令李秀峰罗志刚李党军朱云峰唐红波
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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