Microcrystalline graphite powder for carbonic refractory material and preparing method of microcrystalline graphite powder

Abstract

The invention discloses microcrystalline graphite powder for a carbonic refractory material and a preparing method of the microcrystalline graphite powder. The preparing method comprises the preparing steps that firstly, 5-35wt% of phenolic resin is dissolved into 10-35wt% of alcohol, 40-80wt% of microcrystalline graphite is added, magnetic stirring is conducted for 2-10 minutes, and paste is obtained; secondly, the paste is put into an oven to be processed for 8-24 hours at the medium and low temperature, and a cured product is obtained after cooling; thirdly, the cured product is subjected to ball milling and then passes through a 325-mesh screen, and ball-milled powder is obtained; fourthly, the ball-milled powder is subjected to high-temperature carbonization for 1-4 hours under the condition of isolated air, and the microcrystalline graphite powder for the carbonic refractory material is obtained after cooling. The microcrystalline graphite powder is simple in technology and low in cost, the utilization rate of the microcrystalline graphite is increased, the added value of the product is increased, and the dilemma of resource exhaustion of crystalline flake graphite is relieved; in addition, the carbonic refractory material produced through the microcrystalline graphite powder prepared through the method has the good thermal shock stability and slag corrosion resisting performance, and can meet the use requirement.

Description

technical field [0001] The invention belongs to the technical field of graphite powder, and in particular relates to a microcrystalline graphite powder for carbon-containing refractory materials and a preparation method thereof. Background technique [0002] Carbon-containing refractory materials refer to refractory products made of carbon or carbon compounds, and the main component is carbon. Carbon-containing refractories are widely used in the iron and steel industry because of their excellent high temperature resistance, corrosion resistance and thermal shock resistance. At present, the production of carbon-containing refractories generally uses flake graphite with low impurity content as the carbon source. However, with the massive consumption of flake graphite, flake graphite is facing the problem of resource depletion. For another domestic microcrystalline graphite resource with abundant reserves and low price, if it can be developed as a carbon source for the produ...

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Problems solved by technology

[0003] However, natural microcrystalline graphite has a high content of impurities, and these impurities will form a large amount of liquid phase under high temperature conditions, resulting in a decrease in the high temperature mechanical properties of refractory materials

In order to solve this problem, microcrystalline graphite is purified by high-temperature alkali calcination in the prior art. Although this measure reduces the content of impurities in microcrystalline graphite, the production steps are complicated, and the high-temperature alkali calcination process requires high equipment. , the process control is difficult, and greatly increases the production cost