Electro-slag remelting refining slag efficiently utilizing return slag and preparing method and application method thereof

Abstract

The invention discloses electro-slag remelting refining slag efficiently utilizing return slag, a preparing method and an application method thereof and belongs to the technical field of the electro-slag remelting refining slag. The electro-slag remelting refining slag is composed of, by mass percent, 50-80% of electro-slag remelting return slag, 16-35% of fluorite, 4-10% of alumina powder, and 0-5% of lime. According to the preparing method, the electro-slag remelting return slag, the fluorite, the alumina powder and the lime form new slag, the new slag is melted in a slugging furnace in advance after being mixed evenly, and then the liquid slag is crushed by adopting a wind quenching method. According to the application method, the electro-slag remelting refining slag prepared by utilizing the return slag is baked, then coke is adopted as an arc generating agent, metallic aluminum particles are mixed into the electro-slag remelting refining slag, and the slugging time is controlled to be 30 minutes. The remelting technological process of the electro-slag remelting refining slag is stable, the surface quality of steel ingots is good, chemical components are evenly distributed, the slag system cost is 460-942.5 yuan per ton, the cost is lowered by 55-78%, and the return slag is efficiently utilized.

Description

technical field [0001] The invention belongs to the technical field of electroslag remelting refining slag, and in particular relates to an electroslag remelting refining slag which efficiently utilizes returned slag and a preparation method and a use method thereof. Background technique [0002] As a new technology of special metallurgy, electroslag metallurgy plays a pivotal role in the special steel industry. Steel ingots smelted by electroslag have high purity, low sulfur content, less non-metallic inclusions, smooth surface of steel ingots, uniform and dense crystallization, uniform metallographic structure and chemical composition, and this technology is being used more and more widely. At present, the refining slag for electroslag remelting is mainly made of 30%Al 2 o 3 +70%CaF 2 Mainly, where CaF 2 Choose high-grade fluorite ore. However, at present, domestic high-quality fluorite mines are increasingly depleted, and the price is getting higher and higher. This ...

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Problems solved by technology

The patent with the publication number CN101899579 uses the slag system developed by the returned slag, which is mainly used for the remelting of titanium-containing steel, and the utilization ratio of the returned slag is 21.8-48.5%; the patent with the announcement number CN100352955C has a utilization rate of 0 ~30%, but its preparation process is cumbersome, and the liquid slag will be broken after natural cooling, resulting in uneven particle size of the slag. At the same time, the pre-melted slag contains high CaO, and the slag will further absorb moisture after it is completely cooled, which is not conducive to electroslag Control of ingot hydrogen content

According to the existing technology of electroslag remelting and returning slag, how to efficiently use (the utilization rate is more than 50%) the existing electroslag remelting and returning slag, and how to prepare new electroslag remelting The various requirements of remelting are the key difficulties in resource utilization of electroslag remelting and returning slag, and no reasonable solution has been given in the prior art

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