Nanometer pore light-weight corundum refractory aggregate and preparation method thereof

Abstract

The invention relates to a nanometer pore light-weight corundum refractory aggregate and a preparation method thereof. The technical scheme of the preparation method is that 1 to 15 mass parts of water-soluble salts are dissolved into 15 to 25 mass parts of water to obtain a mixed solution; then, 85 to 99 mass parts of industrial aluminum oxide micro powder is put into a rotating pelletizer; under the rotation condition, the mixed solution is uniformly sprayed onto the industrial aluminum micro powder; the rotating pelletizer rotates until the industrial aluminum oxide micro powder totally forms spherical particles; then, the spherical particles are dried for 12 to 36 hours under the condition of 110 to 200 DEG C; the heat insulation is performed for 1 to 8 hours under the conditions of 1750 to 1950 DEG C, and thus the nanometer pore light-weight corundum refractory aggregate is obtained. The preparation method of the nanometer pore light-weight corundum refractory aggregate has the advantages that the cost is low; the process is simple; the prepared nanometer pore light-weight corundum refractory aggregate has the characteristics that the apparent porosity is low; a great number of nanoscale intracrystalline closed opening air pores are contained; the heat conductivity is lower; the molten slag erosion resistant capability is high.

Description

technical field [0001] The invention belongs to the technical field of lightweight corundum refractory aggregates. Specifically relates to a nanoporous lightweight corundum refractory aggregate and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of refining technology outside the furnace, the ladle plays an increasingly important role in the metallurgical process, and the service conditions of the refractory materials in the working layer are also more stringent. Refractory materials are required to have excellent mechanical strength, resistance Thermal peeling and scouring performance and slag resistance performance, but also has good heat insulation performance. The light weight of refractory materials in the working layer is considered to be an effective way to achieve high-quality and multi-functional refractory materials. On the one hand, the closer the heat insulating refractory material is to the working surfac...

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Problems solved by technology

O. Lyckfeldt et al. used starch as a binder and foaming agent (O. Lyckfeldt, J.M. F. Ferreira, Processing of porous ceramics by starch consolidation, J.Eur. Ceram. Soc. 18 (2) (1998) 131–140), Porous alumina was prepared. Although the volume density of the prepared aggregate was significantly lower, the apparent porosity and pore size were larger; S. J. Li et al. used kaolinite as a foaming agent (S. J. Li, N. Li, Effects of composition and temperature on porosity and pore size distribution of porous ceramics prepared from Al(OH) 3 and kaolinite gangue, Ceram. Int. 33 (4) (2007) 551-556), prepared a porous corundum-mullite aggregate. Although the average pore size of the prepared aggregate was small, the apparent porosity was as high as 40%; R. Salomãoa et al. used the in situ decomposition of hydrotalcite (R. Salomãoa, M.V. Bôasa, V.C. Pandolfellia, Porous alumina-spinel ceramics for hightemperature applications, Ceram. Int. 37 (4) (2011) 1393-1399), prepared Porous corundum-spinel aggregate, the prepared aggregate cannot meet the production requirements in terms of apparent porosity and pore size

[0004] "A light-weight corundum refractory aggregate with micro-closed cells and its preparation method" (ZL 201410405108.9) patented technology and "A lightweight micro-closed-cell magnesium-containing corundum refractory aggregate and its preparation method" (ZL 201410688444.9) patented technology, Although the lightweight corundum refractory aggregate and the lightweight magnesium-containing corundum refractory aggregate with low apparent porosity and a large number of micro-closed pores have been prepared respectively by wet method, the cost of nano-powder in the raw materials used is relatively high, and the wet method The preparation process is relatively complicated, and it is difficult to realize industrial production