High thermal conductivity and high microporous electrically calcined coal based carbon brick and preparation method thereof

Abstract

The invention discloses a high thermal conductivity and high microporous electrically calcined coal based carbon brick and a preparation method thereof. The technical scheme includes: conducting presintering in reducing atmosphere in an atmosphere furnace successively to obtain activated electrically calcined anthracite particles and activated electrically calcined anthracite fine powder; mixing nickel nitrate hexahydrate with anhydrous ethanol to obtain a nickel nitrate solution; taking 10-20wt% of activated electrically calcined anthracite fine powder, 4-10wt% of alpha-Al2O3 micropowder, 4-10wt% of silicon powder, 2-6wt% of aluminum magnesium alloy powder, 1-2wt% of carbon black and 0.5-1wt% of boron carbide powder as the matrix, and using 60-70wt% of activated electrically calcined anthracite particles as the aggregate; firstly putting the aggregate and a nickel nitrate solution into a mixing mill, performing mixing, then adding thermosetting phenolic resin, and conducting mixing milling, then adding the matrix blended matrix fine powder, and carrying out mixing milling, molding and drying; and finally performing firing in nitrogen atmosphere and under a 1080-1280DEG C condition, thus obtaining the high thermal conductivity and high microporous electrically calcined coal based carbon brick. The product prepared by the method provided by the invention has the characteristics of high thermal conductivity, high micropore ratio and good resistance to molten iron erosion.

Description

Technical field [0001] The invention belongs to the technical field of electric calcined coal-based carbon bricks. Specifically, it relates to a high thermal conductivity and high microporous electrically calcined coal-based carbon brick and a preparation method thereof. Background technique [0002] As we all know, the service life of carbon bricks determines the generation of blast furnace service. In order to ensure the life of the blast furnace, the thermal conductivity, The pore volume ratio of <1μm and molten iron corrosion index are determined as the key performance indicators of carbon bricks. Improving the thermal conductivity of carbon bricks can not only alleviate the damage to the hearth masonry caused by the temperature difference between the oven and the initial stage of production, but also help form a layer of slag iron shell on the hot surface of the carbon bricks to prevent the corrosion of the carbon bricks by molten iron and slag. Studies have shown that ...

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Problems solved by technology

At present, in order to improve the thermal conductivity of electric calcined coal-based carbon bricks, most scientific researchers at home and abroad use graphite materials with high thermal conductivity, such as "High thermal conductivity carbon bricks for blast furnaces and their manufacturing methods" (CN1304329C), "Used for smelting Hot-pressed fired carbon bricks for iron blast furnace lining and hearth" (CN1293207C), "High thermal conductivity microporous molded carbon brick and its production method" (CN1328219C), "A carbon brick for ironmaking blast furnace lining and its preparation method" (CN101514377B), "A carbon brick for blast furnace hearth bottom and its preparation method" (CN102432316A), "A kind of high thermal conductivity ultra-microporous carbon brick and its preparation method" (CN102992805B), "A kind of high thermal conductivity carbon brick and its production method" (CN102992793A), "a carbon brick for blast furnace lining and its preparation method" (CN103613393A), "high thermal conductivity carbon brick" (CN104557065A), "high thermal conductivity high temperature molded carbon brick" (CN103951440A) and "a A kind of high thermal conductivity ultra-microporous carbon brick and its preparation method" (CN102992805B) and other patented technologies, adding more than 30wt% of graphite substances in the preparation process of carbon bricks, although improving the thermal conductivity of carbon bricks to a certain extent; but in Under the actual production environment conditions of the blast furnace, these graphite substances are easily dissolved into the molten iron, leaving holes in the carbon brick, providing channels for the penetration of molten iron, and causing the carbon brick to form an embrittlement layer. Structural spalling of carbon bricks

In addition, the purchase cost of graphite materials is high, adding a large proportion of graphite will definitely increase the manufacturing cost of carbon bricks, which is not conducive to the reduction of blast furnace production costs

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