Carbonaceous refractory and method for preparing same

Abstract

A carbonaceous refractory material is produced by adding an organic binder to a mixture containing a carbonaceous material comprising a carbonaceous raw material comprising calcined anthracite, calcined coke, artificial graphite or natural graphite or a mixture thereof at 50 to 85% as the principal raw material, alumina particle at 5 to 15%, metal silicon particle at 5 to 15%, and one or two or more of titanium carbide powder, titanium nitride powder and titanium carbonitride powder at 5 to 20% in total, kneading and molding the resulting mixture and baking the molded article under non-oxidizing atmosphere. By using the carbonaceous refractory material as the inner lining material for the side wall and bottom of blast furnace hearth, the consumption of the inner lining material due to the dissolution thereof in melted pig iron can be decreased, and simultaneously, the abrasion due to the flow of melted pig iron can be decreased, which works to prolong the life of the blast furnace.

Description

technical field [0001] The present invention relates to a carbon-containing refractory material suitable for use as a refractory material under a non-oxidizing atmosphere, especially suitable for use as a lining material for the side wall area and furnace bottom area of ​​a blast furnace hearth (汤拉まり) and its manufacturing method . Background technique [0002] In recent years, non-oxidizing atmosphere kilns such as blast furnaces, along with the progress of large-scale, due to the harsh operation, high-pressure operation, fine powder carbon blowing operation, etc., the damage factors of lining refractory materials have increased, but on the other hand, in order to suppress a large number of blast furnaces The initial investment is expected to prolong the service life of the blast furnace. The factor determining the service life of a blast furnace like this is the durability of the furnace lining material in the hearth side wall area and furnace bottom...

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Problems solved by technology

But the current situation is that in order to make the high melting point protective layer non-reactive or non-wetting combination with the carbon-containing refractory material, the high melting point protective layer cannot be fixed in the bottom area of ​​the furnace, and the loss of the protective layer cannot be prevented.

[0016] As mentioned above, the durability of carbon-containing refractory materials can be improved by reducing the charring dissolution rate of carbon-containing refractories and making them wet molten pig iron. However, in the traditional method, although thermal conductivity and slag resistance can be maintained, The dissolution rate cannot be reduced by adding carbon, and carbonaceous refractory materials that wet molten pig iron have not been disclosed so far

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