A kind of carbon composite refractory material and preparation method thereof

Abstract

The invention relates to a carbon composite fireproof material and a preparation method thereof. A technical scheme of the method is that: raw materials of the carbon composite fireproof material comprise: 55-75 wt% of oxide particles, 10-20 wt% of oxide fine powder, 5-10 wt% of oxide micropowder, 1-5 wt% of a carbonaceous material, 0.1-3 wt% of graphene, 2-8 wt% of an antioxidant and 3-6 wt% of an organic binding agent. The preparation process for the carbon composite fireproof material comprises: grinding the grapheme, the oxide micropowder and the antioxidant according to the correspondingcontents of the raw materials to obtain precast mixed powder; then uniformly mixing the precast powder, the oxide particles, the oxide fine powder, the carbonaceous material and the organic binding agent, and molding; carrying out heat treatment at a temperature of 180-240 DEG C, then carrying out light burning at the temperature of 700-850 DEG C or carrying out sintering at the temperature of 1100-1400 DEG C to obtain the carbon composite fireproof material. The carbon composite fireproof material provided by the present invention has characteristics of high strength, low thermal conductivity, excellent thermal shock resistance and excellent slag corrosion resistance, and meets the requirement of energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a carbon composite refractory material and a preparation method thereof. Background technique [0002] The carbonaceous raw material in traditional carbon composite refractories is mainly graphite, and carbon black and resin powder are also added to some materials. Since the amount of carbonaceous raw materials added is generally 5-18%, the carbon composite refractory has good thermal shock stability and slag erosion resistance. However, the introduction of too many carbonaceous raw materials will also bring the following four problems: (1) Due to the dissolution of C in molten steel, the molten steel will be seriously increased in carbon, which greatly restricts the technological development of low carbon steel and ultra-low carbon steel ; (2) The strength of the material is low, it is easy to be damaged under oxidative conditions, and the consumption o...

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Problems solved by technology

However, the introduction of too many carbonaceous raw materials will also bring the following four problems: (1) Due to the dissolution of C in molten steel, the molten steel will be seriously increased in carbon, which greatly restricts the technological development of low carbon steel and ultra-low carbon steel ; (2) The strength of the material is low, it is easy to be damaged under oxidation conditions, and the consumption of refractory materials is large; (3) The thermal conductivity of the material is high, resulting in excessive temperature drop of molten steel and excessive heat loss; (4) Carbon oxidation produces A lot of CO 2 gases, exacerbating the greenhouse effect and consuming a large amount of carbon resources

[0003] "A low-carbon magnesium oxide-based composite refractory material and its preparation method" (CN200710304720.7) patented technology, the compressive strength of the refractory material obtained by compounding low-content graphite and carbon black is better than that of ordinary magnesium-carbon refractory materials , but its thermal shock stability and slag erosion resistance are worse than magnesia-carbon refractories; "a low-carbon aluminum-carbon refractory for continuous casting and its preparation method" (CN201010608658.2) patent technology, using 0-3% carbon Plain and fired in a nitrogen atmosphere, although its oxidation resistance is high, its thermal shock stability is still not good enough; "low carbon magnesia carbon brick" (Qin Xianpeng, Li Yuanbing, Li Yawei, et al. The influence of carbon brick performance, " refractories ", 2007,41 (3): 208-212) disclosed technology, due to the introduction of titanium carbonitride, material anti-slag performance is better, anti-oxidation performance improves to some extent, but Inferior to traditional metal Al powder, and the strength is not high

In general, directly reducing the carbon content in carbon composite refractories will lead to a decrease in the thermal shock stability and slag erosion resistance of carbon composite refractories.