Silicon carbide brick for garbage incinerator and preparation method thereof

Abstract

The invention relates to a silicon carbide brick for a combustion chamber of a garbage incinerator and a preparation method thereof. The silicon carbide brick is combined by silicon oxide, and the content of SiC in the brick is more than or equal to 80 weight percent; the brick is formed by mixing, forming and calcining a major ingredient, a bonding agent and an antioxidant; the major ingredient is 80 to 98 weight percent of silicon carbide powder; the bonding agent is 2 to 20 weight percent of shaped or unshaped SiO2 micro powder or fine powder or solution; and the antioxidant is 0 to 5 weight percent of metal silicon powder or metal aluminum powder or mixture thereof. The preparation method comprises the following steps of: mixing raw materials in a ratio, forming under high pressure, and calcining in a kiln furnace at the high temperature of between 1,300 and 1,500 DEG C. The silicon carbide brick combined by the silicon oxide has high acid-base erosion resistant capacity, high high-temperature abrasion performance, high heat shock stability and high antioxidation performance, and meets the using requirements of environment friendliness and long service life.

Description

technical field [0001] The invention relates to a silicon carbide brick used in a garbage incinerator. Background technique [0002] At present, countries around the world are making more and more efforts to realize a "comprehensive waste economy". The main content of this concept is to avoid generating waste and reuse waste. Some western countries have made remarkable achievements in waste disposal efforts, and have researched and developed various methods of waste disposal: biological treatment, thermal treatment, and the combination of biological treatment and thermal treatment. A comparative study of various waste disposal methods shows that there is no technology that can replace the incineration method at present. This method has a series of advantages such as large capacity reduction, timely treatment, high degree of harmlessness and heat recovery, and has attracted much attention. , Has become the main way of waste disposal in developed countries. In order to adapt...

AI Technical Summary

Problems solved by technology

Since the type and content of the raw material of the binder have a great influence on the performance of the product, the phase analysis shows that the binder phase of the clay-bonded SiC material is composed of quartz, mullite and aluminosilicate glass phases. Due to the existence of a large number of glass phases , the thermal shock stability of the material is poor, and other high-temperature properties, such as wear resistance and strength, are not ideal and cannot meet the requirements of use. Although the mullite-bonded silicon carbide bricks developed in the later period have improved performance, they are not too obvious

However, although silicon nitride bonded silicon carbide bricks, self-bonded silicon carbide bricks, and sialon bonded silicon carbide bricks can meet the performance requirements, the process is complicated and the cost is high, which cannot be accepted by the market.

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