Boron-containing additive for carbide refractory and preparation thereof

Abstract

The invention provides a boron-containing additive for carbon refractory, which is characterized in that the boron-containing ingredients including metal boride, B4C or amorphous boron powder are directly compounded in spongy basal body of Al2O3 or MgO by the in-situ synthesis technology so as to form Al2O3-base or MgO-base boron-containing additive. The product takes loose sponge shape. The invention adopts the boric anhydride and metal oxide, or the boric anhydride and graphite, or the boric anhydride as raw materials, and adopts the aluminum powder or magnesium powder as a reducing agent; the materials and the reducing agent are mixed, activated and are then placed in a self-spreading reacting furnace; the partial ignition mode is adopted to initiate the combustion synthesis reaction so as to produce the Al2O3-base or MgO-base boron-containing additive. The boron-containing additive for carbon refractory has the advantages of simple technique, low production cost and high product purity and does not have secondary pollution caused by crashing in the traditional production technique.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory additives, in particular to boron-containing additives for carbonaceous refractory materials and a preparation method thereof. Background technique [0002] Carbon-containing refractories are widely used in the inner lining of thermal equipment for metallurgical furnaces because the introduction of graphite improves the slag resistance and thermal shock resistance of refractories. High-strength magnesia-carbon bricks are widely used in the lining of various refining furnaces and ladles due to their good thermal shock resistance and slag resistance. For example, use in oxygen converters and circuits can significantly increase furnace life. Aluminum carbon refractories also have good high temperature strength, good thermal shock stability and slag corrosion resistance, and are currently the most common refractory materials for continuous casting. The main refractory materials for...

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Problems solved by technology

[0004] Although boron-containing additives have good oxidation resistance, etc., their application is not widespread, especially in ordinary refractory materials, the main reason is that such additives are expensive, resulting in high cost of such additives. The main reason is that this type of boride is mainly prepared by high-temperature synthesis technology, the production process is complicated, and the energy consumption is high, which directly limits the wide application of this type of material.