Composite carbon raw material for carbon-containing refractory material and preparation method thereof

Abstract

The invention relates to a composite carbon raw material for carbon-containing refractory materials and a preparation method thereof. Its technical scheme is: first add expanded graphite accounting for 40-75wt% of the composite carbon raw material and 5-40wt% liquid phenolic resin into the granulator and mix evenly, and then add 5-40wt% of the composite carbon raw material % of solid phenolic resin powder is added to the granulator for granulation to obtain granulated material; then the granulated material is baked at 140~230°C for 24 hours, and then heated at 700~1300°C in an atmosphere of buried carbon or nitrogen. Keep warm for 1 to 4 hours under the same conditions, crush and sieve to obtain composite carbon raw materials for carbon-containing refractory materials. The composite carbon raw material prepared by the invention has excellent performance and low cost, and the prepared composite carbon raw material is used in carbon-containing refractory materials, which can not only greatly reduce the carbon content and thermal conductivity in carbon-containing refractory materials, but also improve carbon-containing refractory materials. The comprehensive performance of the material, especially the mechanical performance, and the effect of energy saving and emission reduction are remarkable.

Description

Technical field [0001] The present invention is the field of refractory material technology, mainly involving a composite carbon -resistant material and its preparation methods for carbon -containing refractory materials. technical background [0002] Carbon raw materials have excellent performance such as non -moisturizing steel and residue, high refractory resistance, small thermal expansion coefficient, high thermal conductivity, and no co -melting with refractory materials at high temperatures.Fire resistance to improve its heat -shaking stability and residue erosion.The existing domestic and foreign steel mills using carbon -resistant materials for carbon resistance are natural scales graphite.The carbon content of traditional carbon -resistant materials is generally 7 ~ 18WT%, and some are even as high as 30WT%. Excessive carbon content makes the material in the process of use: (1) The contamination of steel water is particularly polluted by carbon water.The phenomenon of c...

AI Technical Summary

Problems solved by technology

The carbon content of traditional carbon-containing refractory materials is generally 7~18wt%, and some are even as high as 30wt%. Excessively high carbon content causes the following problems in the use of materials: (1) The pollution of molten steel due to the dissolution of carbon is particularly The phenomenon of carbon increase is serious, which restricts the technological development of low carbon steel and ultra-low carbon steel; (2) The thermal conductivity of the material is high, which leads to the rapid drop of molten steel temperature and excessive heat loss; (3) Carbon oxidation produces a large amount of CO 2 Gas, exacerbating the greenhouse effect pollutes the environment and consumes a large amount of carbon resources

However, these nano-carbon raw materials are often simply added directly to the material. On the one hand, the cost is high due to the difficulty in preparation, and on the other hand, it is difficult to fully play their role due to the large specific surface area and difficulty in dispersion, which ultimately limits their use in actual production. usage of

For example: "A carbon composite refractory material and its preparation method" (CN201110157588.8) patented technology, the graphene with an anti-oxidation coating on the surface is partially or completely replaced by ordinary flake graphite, and evenly dispersed in the carbon-containing refractory material, The prepared carbon composite refractory has high strength, low thermal conductivity, excellent thermal shock stability and slag erosion resistance, but the cost of graphene is high, and the preparation technology of anti-oxidation coating is relatively complicated, which limits the practical production of graphene. Application in the process; "A modified carbon raw material for carbon-containing refractories and its preparation method" (CN201010566519.8) introduces nano-carbon black and multi-walled carbon nanotubes with ceramic coatings, but nano-carbon black and The cost of multi-walled carbon nanotubes is high, and due to the large specific surface area and easy agglomeration, it is difficult to disperse evenly in carbon-containing refractory materials, and it is difficult to give full play to its own advantages

In addition, "a low-carbon magnesia-carbon brick and its preparation method" (CN200910014811.6) patent technology uses expanded graphite to partially or completely replace flake graphite, which significantly reduces the thermal expansion rate of low-carbon magnesia-carbon bricks and improves peeling resistance. , but the volume of expanded graphite is too large (the volume of expanded graphite can reach more than 200 times the volume of flake graphite of the same mass), if it is directly added to the material, the content should not be too large

In general, graphene, nano-carbon black, carbon nanotubes and expanded graphite are carbon raw materials with excellent properties and different morphologies, but they also have problems such as cost and dispersion. Adding carbon-containing refractory materials, not only the actual production cost is too high, but also it is difficult to improve the performance of carbon-containing refractory materials

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