Aluminum chrome refractory material

Abstract

The invention belongs to the technical field of refractory materials, in particular to an aluminum chrome refractory material, which takes white fused corundum as a body and is formed by adding scraps (the scraps are collected and crushed into the synthetic size) generated in the cold processing process of a dense chromic oxide product, Alpha-Al2O3 powder or chrome oxide green or white fused corundum powder and sintering at a high temperature in combination with an inorganic binding agent or an organic binding agent. A product obtained in the invention can be widely applied to a coal water slurry gasification furnace back lining, a hard carbon black reaction furnace inner lining, a residual oil gasification furnace inner lining in the petrochemical industry, a glass wool molten pool inner lining and the like, fully and effectively makes use of the scraps generated in the cold processing process of the dense chromic oxide product and has the characteristics of low impurity content, high refractoriness, excellent physical performance, good thermal shock resistance and strong erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an aluminum-chromium refractory material. Background technique [0002] Aluminum chromium refractories generally refer to Cr in refractory materials 2 o 3 ≤40%, the balance is generally Al 2 o 3 , has the characteristics of high refractoriness, excellent corrosion resistance, good thermal shock resistance and high wear resistance. This kind of refractory material is widely used in coal water slurry pressurized gasification furnace backing, carbon black reaction furnace lining, residue oil gasification furnace lining and glass wool melting furnace lining in petrochemical industry, etc., and can also be used as heating furnace Chrome corundum platform brick is an indispensable material for high temperature industry. [0003] Al of aluminum chromium refractories 2 o 3 It mainly comes from the fused white corundum raw materials of various particle size...

AI Technical Summary

Problems solved by technology

With the advancement of the aluminothermic smelting process, in order to further increase the yield of metallic chromium, the addition of potassium chlorate and sodium chlorate was increased during the chromium smelting process, which resulted in an increase in the content of alkali metal oxides in aluminum-chromium slag, while alkali metal oxides and Al in aluminum chromium slag 2 o 3 and Cr 2 o 3 Solid solution binding, with (Na,K) 2 O 11 (Al,Cr) 2 o 3 Form exists, this is an unstable phase, the product expands during the production process, resulting in a large apparent porosity, a decrease in bulk density, and poor physical properties

Though " make the production technology of high-grade refractory material with aluminum chromium slag " (CN 101066876A) introduced pickling method to reduce the Na in the aluminum chromium slag 2 O and K 2 O, but Na 2 O and K 2 O mainly in (Na,K) 2 O 11 (Al,Cr) 2 o 3 Form exists, Na is reduced by pickling 2 O and K 2 O content, the effect is not obvious, the cost is high, and secondary pollution occurs; at the same time, the quality of the product is poor, the expansion is large, the apparent porosity is high, and the compressive strength at room temperature is low.

The document "Using high-alkali aluminum-chromium slag to synthesize magnesium-aluminum-chromium spinel" introduces a way to rationally utilize aluminum-chromium slag, but introduces magnesium oxide, which is not suitable for the process of aluminum-chromium refractory materials. At the same time, Na 2 O and K 2 O volatilization will also increase the apparent porosity of the product