Aluminum-titanium-silicon carbide composite refractory castable for iron-making blast furnace

Abstract

The invention discloses an aluminum-titanium-silicon carbide composite refractory castable for an iron-making blast furnace. The castable comprises the following components in percentage by mass: 56%-78% of Al2O3, 4%-16% of TiO2, 5%-18% of SiC, 0.1%-1.5% of Fe2O3, 5%-34% of SiO2 and the balance of CaO, and MgO, K2O, Na2O 0.3%-2.0%. The aluminum-titanium-silicon carbide composite refractory castable for the iron-making blast furnace, provided by the invention, can be used for pouring of a hearth lining, an iron notch area, a tuyere area and a cooling wall working end, wet spraying of parts such as a bosh, a furnace bosh and the middle upper part of a furnace body, and the like. During use, when a TiO2 component in the aluminum-titanium-silicon carbide composite refractory castable is in contact with N2, CO and C in a blast furnace, carbonitride with high hardness, high refractoriness and good stability is generated on a contact interface, so that the capacity of the refractory castable for resisting chemical erosion and mechanical erosion of products in the furnace is improved, and the built furnace lining has a self-protection function; the damage rate of the furnace lining is reduced, and the service life of cooling equipment, a furnace shell and the like is prolonged, so that the service life of the blast furnace is prolonged.

Description

technical field [0001] The invention relates to the technical field of refractory materials for ironmaking blast furnaces, in particular to an aluminum-titanium-silicon carbide composite refractory castable for ironmaking blast furnaces. Background technique [0002] The refractory castables currently used in the lining of ironmaking blast furnaces mainly include corundum, corundum-silicon carbide, ASC refractory castables, etc., and are mainly used for hearth lining, tap area, tuyere area, and stave working end Pouring and wet spraying of the furnace bosh, furnace waist and the middle and upper parts of the furnace body, etc. [0003] The refractory lining in the blast furnace is in a working environment with molten slag iron and full of high temperature, high pressure and high flow rate gas. There are also unfavorable factors such as primary iron and primary slag that are extremely corrosive to refractory materials in the working environment of the furnace belly. During ...

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Problems solved by technology

Since the oxides and non-oxides that make up these refractory lining materials cannot form compounds that are beneficial to self-protection in the blast furnace atmosphere, they can only rely on the original structure and their own structural strength to resist molten slag iron and high-speed gas flow. The chemical erosion and mechanical erosion of the furnace lining and other harmful elements will inevitably lead to the gradual reduction of the thickness of the furnace lining over time, although under the cooling effect of the blast furnace cooling equipment, the hot surface of the furnace lining can form a "slag skin" that hinders chemical erosion and mechanical erosion. However, chemical erosion and mechanical erosion still exist after the old slag peels off and before the new slag is formed, and the thickness of the refractory lining will continue to decrease

[0004] The above-mentioned defects in the refractory lining formed by castables currently used in blast furnaces lead to the gradual thinning of the lining thickness under the chemical erosion and mechanical erosion of the products in the furnace, and finally lose the protection function of cooling equipment, furnace shell and other devices, making these devices Unable to obtain a long service life, thereby reducing the life of the blast furnace

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