Light-weight corundum refractory aggregate and preparation method thereof

Abstract

The invention relates to a light-weight corundum refractory aggregate and a preparation method thereof. The preparation method comprises the following steps: using 40wt% to 60wt% of gamma-Al2O3 fine powder, 30wt% to 50wt% of alpha-Al2O3 micro powder, 1wt% to 5wt% of Al(OH)3 micro powder, 1wt% to 5wt% of nanometer aluminum oxide micro powder, 1wt% to 10wt% of saccharides polymer and 0.1wt% to 5wt% of antifreeze proteins as raw materials, adding 20wt% to 70wt% of water according to the raw materials additionally, and using a planetary ball mill for wet milling for 0.5-3 hours; putting slurry after wet milling in a mold, freezing for 6-24 hours under the condition of -30 to -90 DEG C, and demolding; then drying 12-36 hours under the condition of 110-200 DEG C, and preserving the temperature for 3-6 hours under the condition of 300-800 DEG C; and finally aluminizing so that the plating thickness is 0.1-0.5 mm, preserving the temperature for 3-6 hours under the condition of 500-900, sintering for 1-5 hours under the condition of 1600-1900 DEG C, and thus obtaining the light-weight corundum refractory aggregate. The light-weight corundum refractory aggregate prepared by the invention has the characteristics of small volume density, high closed porosity and high slag corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory aggregate. In particular, it relates to a lightweight corundum refractory aggregate and a preparation method thereof. Background technique [0002] The lightweight of working lining refractories is an important research direction in the refractory industry at present. First of all, the closer the heat insulation refractory material is to the working surface, the better the heat insulation and energy saving effect. The light weight of the working lining refractory material can effectively reduce heat loss, reduce production costs, and achieve the effect of energy saving and emission reduction; second, due to the lightweight refractory material There are more pores in it, which can effectively accommodate thermal stress when the temperature changes drastically, and improve the material's thermal spalling resistance. Therefore, the research on lightweight refractory materials for workin...

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Problems solved by technology

O.Lyckfeldt and others used starch as a binder and foaming agent to prepare porous alumina (O.Lyckfeldt, J.M.F.Ferreira, Processing of porous ceramics by starch consolidation, J.Eur.Ceram.Soc.18(2)(1998)131-140.) , although the bulk density of the prepared aggregate was significantly reduced, the apparent porosity and pore size were larger; S.J.Li et al. used kaolinite as a foaming agent to prepare porous corundum-mullite aggregate (S.J.Li, N. Li, Effects of composition and temperature on porosity and pores sized distribution of porous ceramics prepared from Al(OH) 3 andkaolinitegangue, Ceram.Int.33(4)(2007)551-556.), although the average pore size of the prepared aggregate is small, the apparent porosity is as high as 40%; decomposed, and prepared porous corundum-spinel aggregates (R.Salom? The apparent porosity and pore size of the material are also large, and the slag corrosion resistance cannot meet the requirements for high-temperature hot surfaces.

[0004] In summary, the currently prepared lightweight refractory aggregates have the defects of high apparent porosity, large average pore size, and poor resistance to slag corrosion, which are difficult to meet the requirements of actual industrial production and use.