Special composite firebrick for rotary kiln and preparation method thereof

Abstract

The invention relates to a special composite firebrick for a rotary kiln and a preparation method thereof. The special composite firebricks are divided in to common firebricks and special firebricks which are in the same appearance and size, both the common firebrick and the special firebrick consist of working layers (1) and thermal insulation layers (2), and adhesion agents and binding agents are combined between the working layers (1) and thermal insulation layers (2); the adhesion agents are prepared by mixing fluorite powders, hollow microspheres, sub-white fused alumina hollow spheres, mullite hollow spheres, sphere clay powders and silica fumes according to certain proportions to form slurry by utilizing inorganic bonds; the binding agents are inorganic bonds, such as one or mixture of phenolic resin glue, polyvinyl acetate resin glue and urea resin. The special composite firebrick for the rotary kiln can be used for building the inside liner of a rotary kiln calcined by cement, fireproof material, fracturing propping agent for petroleum well, lime and the like, and has the functions of strip resistance, thermal shock resistance, high refractoriness under load and wear resistance.

Description

technical field [0001] The invention relates to a composite refractory brick used for building the inner lining of a calcined rotary kiln, which belongs to the field of refractory materials and can be used for the inner lining of calcined rotary kilns such as cement, refractory materials, fracturing proppant for oil wells, and lime. The lining has the functions of anti-stripping, anti-thermal shock, high-load softness and wear resistance. Background technique [0002] The working area of ​​the rotary kiln can be divided into three sections, namely drying and preheating section, calcining section and cooling section. For example: cement, refractory materials, fracturing proppant for oil wells, lime and other calcined rotary kilns. The role of the lining brick of the rotary kiln is to ensure that the temperature of the three working areas in the furnace has stable and reliable physical properties within the range of process requirements; for example, anti-stripping, thermal s...

AI Technical Summary

Problems solved by technology

In the prior art, the lining brick of the rotary kiln is divided into a refractory layer and an insulating layer; the existing technical defects are: the masonry process is complex, the refractory layer and the insulating layer are easy to separate during use, the refractory and insulating properties are poor, and the service life is short , the actual service life is 8-10 months

It leads to long maintenance time and high production cost, which obviously affects the economic benefits of the enterprise

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