A compound dry material for refining and casting tundish and its preparation method

Abstract

The invention provides a casting tundish composite dry material as well as a preparation method thereof. The dry material is prepared from the following raw materials in parts by weightmass: 20 to 30parts of forsterite, 5 to 10 parts of hydroxymethyl cellulose, 4 to 7 parts of industrial glucose, 3 to 8 parts of high bauxite, 1 to 5 parts of chromium oxide powder, and 2 to 4 parts of sodium hexametaphosphate. The preparation method of the dry material comprises the following steps: (1) uniformly stirring the raw materials in a stirrer,and to obtaining a mixed material; (2) ramming, vibratingand forming the mixed material in a mold, and to obtaining a formed green body; (3) baking the mold and the formed green body in a bake oven with the temperature of 260 to 330 DEG C for 0.5 to 1 hour,cooling, demolding,and to obtaining the casting tundish composite dry material; and (4) performing heatinsulation onng the dry material midbody intermediate for 1 to 3 hours at the temperature of 1050 to 1150 DEG C and 1450 to 1550 DEG C, and thus obtaining thea casting tundish online finished product composite dry material. The dry material does not generate harmful gas in the application process, and is harmless to the human body, pollution-free to the environment, low in carbon residual rate, capable of meeting the production requirement of the ultralow-carbon steel and clean steel, good in sintering performance, good in melt slag permeability resistance, and long in service life.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a compound dry material for smelting and casting tundishes and a preparation method thereof. Background technique [0002] With the vigorous adoption and development of continuous steel casting technology in our country, the iron and steel industry has developed rapidly, and the steelmaking technology has also continued to improve. The tundish is the last process of iron and steel smelting. It was only used as a storage and distributor of molten steel at first. With the development of continuous casting technology, the tundish has been endowed with many new functions, and its metallurgical role has been increasingly affected. Much attention. [0003] The development of continuous casting tundish working lining can be divided into 4 stages: no working lining stage, heat insulation plate stage, coating material or spray paint stage, and dry vibrating ...

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Problems solved by technology

[0004] The matrix used in the existing dry vibration material is mainly magnesium material, which will not cause secondary pollution to molten steel, and has a metallurgical effect on molten steel, which can reduce non-metallic impurities in molten steel, but serious sintering occurs during use. and poor slag penetration resistance, resulting in high cost of tundish working lining, so how to improve its sintering performance and slag penetration resistance while ensuring the performance of dry materials has become a thorny issue

[0005] Moreover, most of the existing dry vibrating materials use phenolic resin as a binder. Although the bonding strength is high, it will decompose during use to produce formaldehyde, cresol, etc., which are very harmful to the environment and the health of workers, and the residual phenolic resin after carbonization High carbon content will increase the carbon content of molten steel, which cannot meet the production needs of ultra-low carbon steel and clean steel

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