Low-heat conductance silicon corundum brick material and silicon corundum composite brick made of same

Abstract

The low thermal conductivity silicon corundum brick and the silicon corundum composite brick made from it belong to the technical field of refractory materials, wherein the low thermal conductivity silicon corundum brick is composed of a liquid binder and the following solid raw materials by weight: Al2O3 content ≥ 87wt% 38-45 parts of bauxite clinker particles, 15-20 parts of silicon carbide powder with SiC content ≥ 90 wt% and free carbon content not less than 5%, 8-13 parts of fused white corundum powder with Al2O3 content ≥ 99 wt%, 6-8 parts of andalusite powder with Al2O3 content ≥ 55wt%, 3-5 parts of SiO2 superfine powder with SiO2 content ≥ 95wt%, 0.5-1 part of elemental silicon ultrafine powder, 0.5-1 part of elemental aluminum ultrafine powder, and Al2O3 content ≥ 30wt % and SiO2 content ≥ 50wt% floating beads 3 ~ 5 parts, Al2O3 content ≥ 30wt% soft refractory clay powder 8 ~ 10 parts. The silicon corundum composite brick made of the low thermal conductivity silicon corundum brick is made of the low thermal conductivity silicon corundum brick and the heavy brick through double-sided machine pressing and firing. When the silicon corundum composite brick provided by the invention is used to build the transition zone of the cement rotary kiln, the average temperature of the cylinder body is low, only 186°C.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a silicon corundum brick with low thermal conductivity, and also to a silicon corundum composite brick made of the brick. Background technique [0002] With the continuous update of cement production technology, cement production equipment is becoming more and more large-scale and energy-saving. Increasing production, improving quality, saving energy and reducing consumption, and reducing costs have become the key to increasing the benefits of enterprises. [0003] At present, spinel bricks and silica bricks are still the mainstream refractory bricks for rotary kilns, but these two types of bricks have the defects of high thermal conductivity and large waste of heat energy. For this reason, some manufacturers and scientific research units have carried out a lot of research work, and introduced some composite bricks combining heavy and light weight. However, because ...

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Problems solved by technology

On the one hand, the temperature of the outer wall of the cylinder is too high, which will increase the heat dissipation of the kiln cylinder, thereby increasing the heat consumption of clinker and increasing the unit cost of clinker; The probability of damage to the equipment accelerates the deformation of the cylinder, and the deformation of the cylinder accelerates the mechanical damage of the inner lining. The result is brick falling and kiln shutdown, which affects the operation rate of the cement rotary kiln.

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