Formula of microporous permeable brick for refining ladle and preparation technology

Abstract

The invention discloses a formula of a microporous permeable brick for a refining ladle and a preparation technology. The formula comprises raw materials in parts by weight as follows: 20-35 parts ofsintered tubular corundum with the particle size range being 2-5 mm, 10-20 parts of sintered tubular corundum with the particle size range being 2-3 mm, 8-15 parts of sintered tubular corundum with the particle size range being 0.1-1 mm, 5-10 parts of sintered tubular corundum with the particle size range being 0.1-0.5 mm, 5-10 parts of fused alumina-rich spinel with the particle size being 0.1-0.5 mm, 2-5 parts of pure calcium aluminate cement, 0.25-1 part of an efficient dispersant, 2-4 parts of 200-mesh fine chromic oxide powder, 1-3 parts of 100-mesh active alumina micro-powder and 0.3-0.8parts of a pore-forming agent. According to the microporous permeable brick, tiny and uniform bubble groups are blown out, tiny bubbles have large surface tension and higher adsorption capacity and can adsorb inclusions in molten steel, so that the inclusions can float and the molten steel can be purified.

Description

Technical field [0001] The invention relates to a formula and preparation process of a microporous air-permeable brick for refining ladle, and belongs to the technical field of ladle refining in the iron and steel metallurgy industry. Background technique [0002] Blowing treatment at the bottom of the ladle is a simple out-of-furnace refining process for degassing and removing non-metallic inclusions from molten steel. This method accelerates the realization of the metallurgical process by injecting gas into the molten steel for stirring, and achieves uniform molten steel temperature and chemical composition , To promote the removal of inclusions or control the form of inclusions. At present, the traditional domestic ventilation method of ventilating bricks for refining ladle is slit ventilation, and the blown bubbles are long and large bubbles, which have weak adsorption capacity and cannot be effectively adsorbed The inclusions in the molten steel make the molten steel not pur...

AI Technical Summary

Problems solved by technology

[0002] Gas blowing treatment at the bottom of the ladle is a simple out-of-furnace refining process for degassing molten steel and removing non-metallic inclusions. This method passes gas into the molten steel for stirring to accelerate the metallurgical process and uniform molten steel temperature and chemical composition , to promote the removal of inclusions or to control the shape of inclusions. At present, the traditional domestic ventilation bricks for refining ladles use slit ventilation, and the blown air bubbles are long strips of large bubbles, which have weak adsorption capacity and cannot effectively absorb Inclusions in molten steel prevent molten steel from being purified