Preparation method of phenolic resin-based micro-nano graphite sheet mixture for carbon-containing fire-refractory material with low carbon content

Abstract

The invention relates to a preparation method of a phenolic resin-based micro-nano graphite sheet mixture for a carbon-containing fire-refractory material with low carbon content. The preparation method adopts the technical scheme with the following steps of firstly, adding 0.1 to 15wt% of graphite (expanded graphite) raw material into 85 to 99.9wt% of phenolic resin to premix; adding the mixture into a three-roll grinding machine from a material feeding roll, and cyclically stripping by three rolls at differential speed, wherein the speed ratio of the three rolls is 1:3:9, and the gap among the three rolls is 0.1 to 30mu m; after cyclically stripping for 2 to 50 times, collecting the phenolic resin-based micro-nano graphite sheet mixture prepared by the invention from a material discharging roll. The prepared phenolic resin-based micro-nano graphite sheet mixture is mainly used for preparing the carbon-containing fire-refractory material, so that the carbon content is greatly reduced on the basis of maintaining/improving the comprehensive property of the carbon-containing fire-refractory material.

Description

technical field [0001] The invention relates to a phenolic resin-based micro-nano graphite sheet mixture for low-carbon carbon-containing refractory materials and a preparation method thereof, belonging to the technical field of refractory materials. Background technique [0002] Carbon materials have good high temperature resistance, chemical stability and thermal shock resistance, especially the characteristics of high interfacial tension with molten metal iron without being wetted, and are widely used in carbon-containing refractories in the iron and steel smelting industry. Among materials, it can significantly improve its slag erosion resistance and thermal shock resistance. At present, the carbon raw material of carbon-containing refractory materials used by large-scale steel mills at home and abroad is mostly natural flake graphite. Traditional carbon-containing refractory materials contain high carbon content (generally 10-20 wt% carbon content) leading to oxidation ...

AI Technical Summary

Problems solved by technology

However, in these technical methods, the micro-nano carbon raw materials are often simply and directly added to the refractory material, making it difficult to disperse evenly throughout the brick body

In addition, the preparation cost of its micro-nano carbon raw materials is relatively high. For example, carbon nanoparticles are prepared by using expensive precursors and complex and expensive pyrolysis processes. In terms of economic cost, large-scale application in refractory materials is not feasible. Third, fine graphite particles with small aspect ratio (i.e. ratio of longest dimension to shortest dimension), nano-sized amorphous carbon black (<10 nanometers, circular shape, very small aspect ratio), etc. replace the scaly Graphite will lead to the loss of the original strengthening / toughening mechanism; fourth, although the nanocarbon particles have a very large surface area, the effective surface area of ​​the covering oxide phase does not actually increase much, the latter two reasons lead to the preparation of The thermal shock resistance and slag erosion resistance of refractory materials are not as good as the current high carbon refractory materials

At the same time, the past method also has the problem of uneven dispersion of carbon raw materials in the binder phenolic resin

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