High-carbon refractory and method for preparing same

Abstract

The invention relates to a novel type of inorganic non-metal material, the high-alumina anthracite coal base refractory which is combined with the compound wedding agent in the continuous casting steel production. The solution loss of a refractory with the alumina anthracite coal base is decreased in the molten steel can improve the erosion resistance of the material, the high-alumina anthracite coal base refractory which still has a high intensity after the decarburization is suitable to be used to produce long nozzle and submerged nozzle. The materials of the high-alumina anthracite coal base refractory are scale graphite, silicon carbide, metallic silicon powder, fused quartz, electro-melted zirconia mullite, white alundum, liquid phenolic resin and aluminium dihydrogen phosphate powder. The preparation method of the invention is that the materials are equably mixed without liquid phenolic resin, and the mixture is added with liquid phenolic resin and granulated and parched to ensure that the volatiles satisfy the forming requirements, and the product is formed under the condition of 150-200MPa, and the formed product is fired in the furnace with the temperature between 1,500-1,600 DEG C and in the reducing atmosphere, the fired product us coated with inoxidzable coating, and the finished product is gained after the fired product with inoxidzable coating is parched. Compared with the product which is produced with the prior art, the refractory of the invention has outstanding characters and remarkable advantages that the scour resistance of molten steel is stronger, the erosion resisting is stronger, and the service life is prolonged greatly, and operation efficiency of continuous casting steel is improved, the production cost is decreased and the operating condition is improved.

Description

technical field [0001] The invention relates to a novel inorganic non-metallic material, an aluminum-carbon refractory material used in the production of continuous cast steel, especially a high-aluminum carbon refractory material combined with a composite binder. Background technique [0002] At present, the aluminum-carbon refractory materials used in continuous steel casting, the carbon in the refractory materials is dissolved by molten steel during the steel casting process, resulting in decarburization and decarburized aluminum oxide. The strength of the matrix part decreases, and it peels off with the erosion of molten steel, which will bring a new round of decarburization and peeling, so the damage of aluminum-carbon refractories is intensified. In order to solve this problem, there are two ways, one is to add antioxidants to improve the oxidation resistance of carbon; the other is to increase the strength of the aluminum oxide matrix after decarburization. [0003] ...

AI Technical Summary

Problems solved by technology

The strength of the matrix part decreases, and it peels off with the erosion of molten steel, which will bring a new round of decarburization and peeling, so the damage of aluminum-carbon refractories is intensified