Cast-molded sliding plate brick for slag stopping of converter tapping hole and production method

Abstract

The invention provides a cast-molded sliding plate brick for slag stopping of a converter tapping hole. The cast-molded sliding plate brick is prepared from the following raw materials: 65-78% of tabular corundum, 8-12% of magnesium-rich spinel, 3-7% of silicon carbide, 6-10% of alpha-aluminum oxide micro powder, 1-2% of pure calcium aluminate cement, 3-6% of rho-aluminum oxide micro powder and 0.05-0.2% of a water reducing agent. During production, the raw materials and the water reducing agent are weighed, stirring is conducted by a stirrer to obtain pug, pouring and vibration molding are carried out, after 24h of curing, demoulding is conducted, drying treatment is performed at 300+ / -10DEG C, and then grinding and coating are conducted to obtain the product. The sliding plate brick is excellent in integrity, good in erosion resistance, stripping resistance and thermal shock resistance, high in strength and good in use performance.

Description

technical field [0001] The invention relates to a cast-formed sliding brick for slag-stopping a converter tap hole and a production method, belonging to the technical field of refractory materials. Background technique [0002] With the change of steel consumption structure, the special steel produced by converter has attracted the attention of many enterprises. The quality of the slag blocking effect of the converter has a direct impact on the quality of the steel. The slag blocking technology of the converter sliding plate has the characteristics of quick response to the slag blocking operation and high slag blocking efficiency. It is a new technology for the slag blocking of the converter. Used in ladle smelting. However, the special smelting environment of the converter, especially the production of high value-added products such as IF steel, oil pipeline steel, bearing steel, spring steel, etc., puts forward more stringent requirements on the tap hole slide. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] Although the service life of the inlaid zirconium plate slide plate is longer than that of the conventional fired aluminum-zirconium carbon slide plate, and the service life is mostly stable at 15-18 furnaces, but the complexity of the production process increases, and the zirconium plate needs to be inlaid with fire clay.

At the same time, the cost of production has also increased significantly

In addition, in the later stage of use, on the one hand, the oxidative strength of the jacket is easy to decrease, and on the other hand, the volume of the fire clay between the zirconium plate and the jacket and the fire clay for the box will shrink, which will easily cause air movement and breakage between the zirconium plate and the jacket, seriously affecting the integrity and service life. , because the integrity cannot meet the long-term use requirements, the zirconium plate cannot fully exert its excellent properties such as corrosion resistance, erosion resistance, and long life.

At the same time, the hidden dangers of unsafety have increased, and more stringent requirements have been put forward for the sliding nozzle and mechanism operators and judges. At present, it has not been widely promoted.

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