Casting material with thermal insulation function

Abstract

The invention discloses a casting material with a thermal insulation function. The casting material comprises the following raw materials by weight percent: 25-45% of alumina hollow ball or mullite hollow ball or high-alumina hollow ball or a mixture of more than two mixed according to any ratio, 5-15% of corundum or mullite aggregate, 3-8% of kyanite, 15-35% of corundum or mullite powder, 0.1-3% of asphalt powder, 1-5% of alumina micro powder, 2-5% of silicon oxide micro powder, 5-15% of calcium aluminate cement powder, 0.01-2% of water-soluble phenolic resin powder, 0.01-0.2% of polymer carboxylic acid salt water reducer and the balance of water, wherein the alumina hollow ball or mullite hollow ball or high-alumina hollow ball has the refractoriness being greater than 1700 DEG C and the particle size of 5-1mm; the particle size of the corundum or mullite aggregate is smaller than 1mm; the particle size of the kyanite is smaller than 0.1mm; the particle size of the corundum or mullite powder is smaller than 0.088mm; the weight of the water is 2-7% of total weight of the added raw materials. By adopting the casting material, heat loss of a kiln can be reduced, the strength is not lower than 7.5MPa after drying at 110 DEG C for 24 hours, and the compressive strength is not lower than 15MPa after firing at 1300 DEG C. Thus, maintenance of the kiln is facilitated, the maintenance time is shortened, and energy consumption is reduced.

Description

technical field [0001] The invention relates to a pouring material, in particular to a heat-insulating refractory material used for wrapping or pouring walking beams and columns in a heating furnace and for piping systems of a hot blast furnace. Background technique [0002] In the heating furnace used in the iron and steel industry, some parts, such as the hot rolling heating furnace, use heavy castables as the castables for the water-cooled pipes or columns. Due to the effect of water cooling, the temperature outside the water-cooled pipes drops rapidly, and the slag hangs seriously, which affects the normal operation. Production, slag hanging serious enough to a certain thickness, often forced to shut down the furnace for maintenance. Therefore, it is necessary to use a castable with a certain heat insulation function, or a report on a lightweight castable. For example, Chinese patent CN200910248783.4 discloses a lightweight refractory castable, which uses light shale po...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention aims to solve the problems of low strength, poor heat insulation performance, low density, non-abrasion resistance, pressure resistance and collision resistance of heat insulation refractory materials in metallurgical kilns. After drying for 24 hours, the strength is not less than 9.5 MPa, and the compressive strength is not less than 15 MPa after firing at 1300 ° C. It can enhance the heat insulation performance, enhance the heat preservation effect, and reduce energy consumption. It has heat insulation function and can be used as the working layer of furnace lining. Castable