Aluminum-magnesium light castable and preparation method thereof

Abstract

The invention relates to an aluminum-magnesium light castable and a preparation method thereof. The technical scheme comprises the following steps: using 60 to 85 wt% of aluminum-magnesium porous ceramic particles as the skeletal material, and using 10 to 35 wt% of corundum fines, 0 to 0.3 wt% of silicon oxide micropowder, 1 to 6 wt% of magnesium oxide micropowder and 2 to 8 wt% of activated aluminum oxide micropowder as the host material; premixing 1 to 3 wt% of water reducer with the host material additionally based on the total weight of the skeletal material and the host material, adding the premixed host material into the skeletal material, and adding 8 to 20 wt% of water additionally based on the total weight of the skeletal material and the host material; and stirring uniformly, pouring, vibration-moulding, and drying the body after the moulding for 6 to 36 hours under the temperature of 110 to 150 DEG C. The product provided by the invention has the characteristics of low silicon content, is cement-free, and has high porosity, small average pore size, high fire resistance, large high temperature strength, low thermal conductivity, good thermal shock stability and strong medium erosion resistance such as the slag and the like. The castable provided by the invention can be used as the energy saving working lining material of the industrial furnace in pyrometallurgy and the like, which can contact with the medium such as the high temperature slag and the like in a long term.

Description

technical field [0001] The invention belongs to the field of castable technology. In particular, it relates to an aluminum-magnesium lightweight castable and a preparation method thereof. Background technique [0002] With the increasing economic development and social progress, energy conservation and emission reduction has become the focus of attention. The development of lightweight insulation materials has been developed rapidly. In terms of lightweight unshaped refractory materials, vermiculite, perlite, ceramsite and fiber castables have been developed. Compared with them, their thermal conductivity is low and they can be used as thermal insulation materials, but their high temperature performance is poor and they are resistant to heat. Slag erosion, especially for alkaline slag, is poor, so it cannot be directly used in industrial furnace linings and other parts in direct contact with slag and other media in high-temperature environments such as metallurgy. [0003...

AI Technical Summary

Problems solved by technology

However, the porous ceramic particles used in the material mentioned above have high porosity, and the average pore size is still relatively large (<30μm). Energy saving needs to be at the expense of weakening the anti-slag penetration and erosion performance of the material, and the lightweight castable is used for a long time. In the parts that are in direct contact with high-temperature steel slag and other media, it must be supplemented with dense particles (<20wt%) to enhance life extension

At the same time, too much silicon oxide in the aluminum-magnesium system can cause the material to produce too much liquid phase at high temperatures, which seriously affects its performance at high temperatures, limits the use temperature of aluminum-magnesium materials, and brings significant "steel" to the molten steel. Oxygenation"