Tertiary air duct low-thermal-conductivity and high-wear-resistance brick and processing technology thereof

Abstract

The invention provides a tertiary air duct low-thermal-conductivity and high-wear-resistance brick and a processing technology thereof and relates to the technical field of refractory bricks. The composition comprises the following raw materials in parts by weight: 5-10 parts of high-alumina bauxite clinker with the particle size of 3-5mm, 20-30 parts of high bauxite clinker with the particle sizeof 1-3 mm, 10-20 parts of high-alumina bauxite clinker with the particle size of 0-1 mm, 10-20 parts of high-alumina bauxite clinker in 200 meshes, 5-20 parts of 90# silicon carbide fine powder in 160-200 meshes, 2-5 parts of bentonite, 1-3 parts of feldspar powder in 300-340 meshes and 0.5-2 parts of yellow dextrin. The processing technology comprises the steps of mixing, forming, drying, firingand cooling. The low-heat-conductivity and wear-resistant brick has excellent fire resistance and wear resistance and relatively high strength. The compressive strength is greater than or equal to 80MPa, the T0.6 load softening temperature is greater than or equal to 1580 DEG C, the heat conductivity coefficient is less than or equal to 1.3 W / (m*K) at 1000 DEG C, the alkali resistance is first level, and the wear resistance coefficient is less than or equal to 7.5 cm<3>. The process can effectively prolong the service life of the brick and prevent the top of the integral brick in the tertiary air duct from sinking or collapsing.

Description

technical field [0001] The invention relates to the technical field of refractory bricks, in particular to a brick with low heat conduction and high wear resistance for a tertiary air duct and a processing technology thereof. Background technique [0002] The firing system of a cement plant mainly includes the processes of preheating, decomposition, compounding and cooling of materials, among which the emergence of pre-decomposition technology (new dry process cement production technology) has greatly improved the thermal efficiency and stand-alone production capacity of cement kilns, and promoted The cement industry should be large-scaled and modernized first. In order to increase the CaCO of the kiln material 3 Decomposition rate, the new dry process kiln is to lead the hot air from the first room of the grate cooler to the kiln tail through the third air duct, and add coal powder with a total fuel content of about 50%-60% in the decomposition furnace, and the temperature...

AI Technical Summary

Problems solved by technology

[0003] The tertiary air duct is an important part of the clinker firing system of the precalcining kiln. Its main function is to connect the cooler and the hot air channel of the precalcining system. Adjustment plays a key role in the high and stable production of the firing system. The instantaneous airflow temperature in the tertiary air duct can reach up to 1300°C. The working surface of the fire brick is subjected to the combined action of high temperature thermal stress and alkali erosion, and the surface becomes embrittled, and the burning flow traces begin to deepen. The interior of the brick body has caused great damage to the physical and chemical performance indicators of the brick body, causing the top of the overall brick in the air duct to sink. After the kiln is shut down, with the extension of the cold kiln time, the sinking phenomenon of the refractory brick will increase or collapse.

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