A kind of low thermal conductivity multi-layer composite potassium aluminosilicate brick and preparation method thereof

Abstract

The invention discloses a low-heat-conductivity multilayer composite potassium aluminosilicate brick and a preparing method thereof.The low-heat-conductivity multilayer composite potassium aluminosilicate brick comprises a working layer, a heat preservation layer and a heat insulation layer, wherein the working layer and the heat preservation layer are connected into a whole in the length direction of the brick, a notch is formed in the end face, located in the width direction of the heat preservation layer, of the heat preservation layer, the shape of the heat insulation layer is matched with that of the notch, and the heat insulation layer is arranged in the notch.The working layer is prepared from synthesis potassium aluminate with the particle size ranging from 0 to 1 mm, silicon carbide with the particle size ranging from 1 mm to 3 mm, silicon carbide with the particle size ranging from 3 mm to 5 mm, synthesis potassium aluminate with the particle size smaller than 0.074 mm, silicon carbide with the particle size smaller than 0.074 mm, an antioxidant and a binding agent.The heat preservation layer is prepared from synthesis potassium aluminate with the particle size ranging from 0 to 1 mm, silicon carbide with the particle size ranging from 1 mm to 3 mm, silicon carbide with the particle size ranging from 3 mm to 5 mm, synthesis potassium aluminate with the particle size smaller than 0.074 mm, silicon carbide with the particle size smaller than 0.074 mm, a high-temperature reinforcing agent, a composite organic pore forming agent and a binding agent.The heat insulation layer is made of an aluminum oxide fiberboard.The low-heat-conductivity multilayer composite potassium aluminosilicate brick has excellent high-temperature usability by means of the advantages of the multilayer composite structure, and the heat conductivity coefficient and the body density are far lower than those of products of the same kind.

Description

technical field [0001] The invention belongs to the technical field of refractory and environment-friendly materials, and in particular relates to a low thermal conductivity multilayer composite potassium aluminosilicate brick and a preparation method thereof. Background technique [0002] The upper and lower transition zones of the new dry-process cement rotary kiln are adjacent to the firing zone, and are often subjected to a harsher operating environment than the firing zone. Bricks are lining bricks. [0003] At present, most of the silica bricks sold in the market use first-grade or super-grade bauxite, and some companies also add fused corundum to improve the high-temperature performance and corrosion resistance of the product, but this also increases the thermal conductivity of silica bricks. The increase of the height makes the heat loss in the cement kiln faster, the fuel consumption per ton of cement increases, and the temperature of the cylinder body increases, w...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, to provide a low thermal conductivity multi-layer composite potassium aluminosilicate brick and its preparation method, which are used to replace the existing silica molybdenum bricks, so as to solve the problem of lining bricks in the upper and lower transition zones of cement kilns. The problem of using

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