Phenolic resin containing nano-carbon powder, nano-carbon modified low carbon magnesium carbon brick and production method thereof

Abstract

The invention relates to a low-carbon MgO-C brick containing modified phenolic resin and nanocarbon which are produced by nano carbon powder and a preparation method thereof. Phenolic resin bonding agent containing nano carbon powder is produced by ohenol, formaldehyde, a dispersant and nano carbon powder; the low-carbon MgO-C brick is produced by adopting fused magnesite, graphite, phenolic resin and an antioxidant as raw materials. The ultrasonic dispersion method adopted by the invention replaces partial graphite with the nano carbon powder and leads the nano carbon powder into the low-carbon MgO-C brick, thus obviously improving the anti-erosion ability and the oxidation resistance of the MgO-C brick. The brick has comparatively low thermal expansion coefficient, low thermal conductivity, low oxidative mass loss and thinner decarburized layer; a slag resistance experiment under conditions of 1600 DEG C, 3h heat preservation and carbon sequestration shows that erosion and osmosis phenomenon of the brick are not obvious, thereby being applicable to sites of converters, electric furnaces and ladle working linings, external scouring of furnaces, key components for continuous castings and refractories for blast furnace ironmaking etc., thus having comparatively large application range.

Description

1. Technical field

[0001] The invention relates to a magnesia refractory material and a preparation method thereof, in particular to a low-carbon magnesia-carbon brick modified by nano-carbon powder containing phenolic resin and nano-carbon and a preparation method thereof. 2. Background technology

[0002] The application history of magnesia refractories is very long, but the thermal expansion coefficient of magnesia bricks is large, and it is easy to peel off during use. Magnesia carbon bricks are developed by adding graphite on the basis of magnesia bricks. Because graphite has a small thermal expansion coefficient and is not easily wetted by slag, it can improve the anti-stripping performance of magnesia-carbon bricks, and can slow down the penetration of slag into the brick and improve its erosion resistance. At present, magnesia carbon bricks have been widely used in converters, electric furnaces, ladles and refining outside the furnace. Since the carbon content of M...

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