Light-weight corundum-magnesia alumina spinel refractory material and a preparation method of same

Abstract

The invention relates to a light-weight corundum-magnesia alumina spinel refractory material and a preparation method of same, wherein porous corundum-magnesia alumina spinel ceramic material granules are used as an aggregate, wherein ceramic material being 3-5 mm in granular size accounts for 10-18 wt%, ceramic material being 1-2.8 mm in granular size accounts for 25-30 wt%, and ceramic material being 0.1-0.8 mm in granular size accounts for 15-20 wt%; a substrate includes 12-18 wt% of porous corundum-magnesia alumina spinel ceramic material fine powder with nano-scale pore diameter, 12-20 wt% of corundum fine powder, 2-5 wt% of magnesite fine powder and 3-8 wt% of alpha-Al2O3 micropowder. The preparation method includes the steps of: 1) placing the aggregate in a vacuum stirrer, vacuumizing the stirrer, and adding a magnesium chloride solution which accounts for 3-8 wt% of the total weight of the aggregate and the substrate, stirring the mixture, and turning off the vacuumizing system; 2) adding the substrate, stirring the materials, shaping and drying the materials, and performing temperature maintenance at 1450-1650 DEG C, cooling the material to produce the refractory material. In the refractory material, diameters of pores are nano-scale, so that the refractory material is low in heat conductivity and high in strength, has high anti-medium erosion performance and excellent thermal shock resistance.

Description

technical field [0001] The invention belongs to the technical field of corundum-magnesium aluminum spinel refractory materials. In particular, it relates to a lightweight corundum-magnesium aluminum spinel refractory material and a preparation method thereof. Background technique [0002] Corundum-magnesium aluminum spinel refractories have been widely used in industrial kilns such as ladles, RH refining furnaces and non-ferrous metallurgy due to their high refractoriness and strong slag resistance. The existing corundum-magnesium aluminum spinel refractories generally use sintered or fused dense corundum as raw material, which not only has a large thermal conductivity, but also has poor thermal shock stability. If it is too high, it will cause a lot of heat loss and deformation of the furnace shell. On the other hand, it will cause stress damage due to intermittent operation. With people's emphasis on energy conservation and environmental protection, high-temperature indu...

AI Technical Summary

Problems solved by technology

[0003] At present, research on lightweight corundum-spinel refractory materials has progressed: such as the patented technology of "a corundum-spinel lightweight refractory material and its preparation method" (ZL201610172544.5), using magnesia carbon thermal reduction Lightweight corundum-spinel refractory materials with different density gradients are prepared by transport oxidation method. The preparation conditions are very strict on the atmosphere. The surface of the prepared material is dense and the interior is loose. Once the surface dense layer is damaged, the interior is loose and porous The structure will be in direct contact with the erosive medium, which will inevitably cause serious damage to the material; another example is the patented technology of "a lightweight corundum-spinel castable and its preparation method" (ZL201510550636.8), which uses spherical corundum aggregates instead of dense corundum Raw materials are used to produce lightweight refractory materials with low thermal conductivity and good thermal shock stability, but the synthesis temperature of the aggregate is as high as 1900-2100 ° C, and the energy consumption is serious