A high-temperature-resistant lightweight heat-insulating castable

Abstract

Disclosed is high temperature resistant lightweight heat insulation castables. Substrate raw materials and the weight percentage are as follows: 53-60% of main substrate particles with the average particle size less than or equal to 7 millimeters, 25-32% of main substrate fine powder which can pass through a target screen mesh not less than 200, 5-10% of ultrafine powder with the average particle size less than or equal to 10 microns, and 6-7% of aluminate cement. The sum of the weight of the substrate raw materials is an entirety, compound water-reducing agents need to be added besides the substrate raw materials, and the weight of the compound water-reducing agents is 0.1-1% of that of the entirety. Besides the substrate raw materials, polystyrene spheres need to be added, the average particle size of the polystyrene spheres is 1-0.5 millimeter, and the weight of the polystyrene spheres is 1-3% of that of the entirety. The high temperature resistant lightweight heat insulation castables can be used as working lining of a thermal furnace which does not contact with molten liquid, the use temperature is from 1250-1650 DEG C according to different main substrates, and the volume density of the high temperature resistant lightweight heat insulation castables can be 1.2-1.7g / cm<3> by adding burning articles with different quantities.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a high-temperature-resistant heat-insulating castable with added burnt matter. Background technique [0002] Generally, lightweight thermal insulation castables use lightweight aggregate as the aggregate of the castable, and use aluminate cement as the binder. Lightweight aggregates include waste lightweight brick sand, ceramsite, perlite and alumina hollow balls, among which waste lightweight brick sand, ceramsite, and perlite light-weight heat-insulating castables can be prepared according to the working conditions by adjusting the production method. Castables of various bulk densities are widely used in thermal furnace linings with low temperatures, such as petrochemical refinery lining materials, but they cannot be used as working linings in thermal equipment with high temperatures (>1250°C). This is because it is difficult to meet the requirements of such ma...

AI Technical Summary

Problems solved by technology

Lightweight aggregates include waste lightweight brick sand, ceramsite, perlite and alumina hollow balls, among which waste lightweight brick sand, ceramsite, and perlite light-weight heat-insulating castables can be prepared according to the working conditions by adjusting the production method. Castables of various bulk densities are widely used in thermal furnace linings with low temperatures, such as petrochemical refinery lining materials, but they cannot be used as working linings in thermal equipment with high temperatures (>1250°C). Used, this is because it is difficult to meet the requirements of such materials as a heat insulation layer on thermal equipment with high temperature, such as metal smelting equipment

Alumina hollow spheres are used as lightweight heat-insulating castables for lightweight aggregates, and the bulk density can be controlled at 1.5~1.7g / cm 3 , can be used on thermal equipment with higher temperature, but this kind of high temperature resistant castable has poor thermal shock stability, thermal conductivity is difficult to meet the requirements, poor construction performance, and expensive

[0003] The use of the loss-on-burn method to produce shaped insulation materials has been mastered very early, for example, the bulk density is 0.5~1.5g / cm 3 , refractory temperature of 1250 ~ 1650 ℃ polyhydrogen mullite thermal insulation refractory bricks, light corundum turn using petroleum coke burnout, etc., but the use of burnout method to produce high temperature resistant lightweight heat insulating castables is not mentioned

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