Flame-proof pouring material for hydroted alumina gas suspending roasting furnace furnace liner

Abstract

The present invention provides a fire-resistant castable material of furnace lining for aluminum hydroxide gas suspension baking furnace. The fire-resistant castable material is a mixture of sintered coke sapphire chamotte and fine-grained mullite of good crystal structure in the sintering process, binder and composite additive according to different proportions; the lining of a main furnace body for aluminum hydroxide gas suspension baking furnace is prepared after furnace building, furnace baking and sintering. Wherein, the percentage of composition of raw materials is: 27 to 33 percent of coke sapphire chamotte less than 3mm, 25 to 30 percent of coke sapphire chamotte with a particle size between 3mm and 5mm, 8 to 15 percent of coke sapphire chamotte with a particle size between 5mm and 8mm, and 15 to 25 percent of fine-grained mullite powder with a particle size less than 0.074mm. The binder uses activated alumina of rho- Al2O3 of 5 to 8 percent; the composite additive uses high-dispersion oxidated alpha-Al2O3, superfine powder and silicon oxide SiO2; the contents of the superfine powder and the silicon oxide are respectively 2 to 5 percent; the particle size of the superfine powder is less than 5 Mu m; the content of sodium tripolyphosphate is 0.1 to 0.3 percent.

Description

technical field [0001] The invention relates to a refractory castable for aluminum hydroxide gas suspension roasting furnace lining, especially with fine-grained mullite as matrix, coke gem clinker as granular material, α-Al 2 o 3 and SiO 2 Ultrafine powder is used as compound additive, with ρ-Al 2 o 3 As a furnace lining material composed of a binder, it is suitable for the special industrial and mining condition requirements of the main furnace body of the aluminum hydroxide gas suspension roaster. Background technique [0002] At present, there is no specialized manufacturer of this product in China. The main furnace lining refractory materials of most aluminum hydroxide production enterprises still use high-alumina clinker with two particle sizes mixed in approximate proportions, and then use liquid water glass as a binder, through mixing-stirring-casting-baking. become. This method has rough process and poor performance, and the sintered furnace lining material ha...

AI Technical Summary

Problems solved by technology

Due to the viscosity of water glass, the mixing effect is poor in a short time, so the mixing and stirring time is increased, and the construction efficiency is reduced.

At the same time, because the density of the first-grade high-alumina clinker is 0.35g / cm larger than that of coke gem clinker and fine-grained mullite 3 , so it not only increases the material consumption and furnace load, but also increases the thermal conductivity of the castable, increases the heat energy loss, and reduces the thermal shock resistance of the material

[0004] Prior to this, there are CN1440952A, CN1785908A, and CN1323761A in the prior art. Because they use cement as a cement, and the raw materials used and their proportions are different, resulting in low strength and poor volume stability, they are not suitable for alumina roasting furnaces. atmosphere, cannot be used as a castable for the production of alumina

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