Magnesia carbon brick and preparation method thereof

Abstract

The invention relates to a magnesia carbon brick and a preparation method thereof. The magnesia carbon brick is prepared from, by weight, 60%-75% of fused magnesite particles, 10%-30% of fused magnesite fine powder, 5%-10% of carbon, 1%-5% of an antioxidant, 1%-3% of a binding agent and 0.4%-1% of furfural waste liquid. In the preparation process, the fused magnesite particles are placed in a mixing mill to be dry-mixed for 2-15 min, then phenolic resin and the furfural waste liquid are added to continue to be mixed for 5-15 min, then carbon is added to the mixture, mixing is carried out for 5-15 min, finally the fused magnesite fine powder and the antioxidant are added to continue to be mixed for 8-15 min, pug is formed, the rotating speed of the mixing mill is set to range from 950 r / min to 1,000 r / min, mixing time ranges from 10 min to 60 min, and the magnesia carbon brick is prepared after compression moulding and drying solidification. The preparation method is simple, the steps are easy to operate, the uniformity of mixed materials of the magnesia carbon brick is improved, the quality of the mixed materials of the magnesia carbon brick is improved, the labor intensity of workers is lowered, the use amount of phenolic resin is reduced, and due to the addition of the furfural waste liquid, the material mixing process is more even, and phenolic resin is prevented from being caked.

Description

technical field [0001] The invention relates to a magnesia-carbon brick and a preparation method thereof, belonging to the technical field of refractory preparation. Background technique [0002] Since the late 1970s, the introduction of carbon into refractory materials has caused a revolution in smelting refractory materials represented by magnesia carbon bricks. Due to the full use of the ultra-high melting point of graphite carbon, the advantages of high temperature, high strength and low thermal expansion rate. Carbon-containing refractory products have the advantages of high refractoriness, good slag resistance, strong thermal shock resistance and low high temperature creep. They are widely used in continuous casting systems of steelmaking blast furnaces, electric furnaces, converters and refining furnaces. increase in magnitude. At the same time, because most carbon-containing products do not need high-temperature firing, energy saving, and simple manufacturing proce...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the phenolic resin in the magnesia-carbon brick in the prior art is easy to produce mud balls during the mixing process and affect the mixing of raw materials, and to provide a magnesia-carbon brick with less amount of phenolic resin and its preparation method