Ceramic material of porous spinel, and preparation method

Abstract

This invention relates to a method for preparing porous spinel ceramic material. The method comprises: (1) mixing magnesite powder 10-90 wt.%, Al(OH)3 powder 10-90 wt.%, water 2-10 wt.% and adhesive 0-3 wt.%; (2) molding; (3) drying the green bodies at 110 deg.C for 4-24 h; (4) sintering at 1600-1800 deg.C, and keeping the temperature for 1-8 h. The porous spinel ceramic material mainly contains MgO and Al2O3, and has main crystal phase of periclase-spinel, spinel or spinel-corundum. The porous spinel ceramic material can be directly contacted with flame retardant magmesium and spinel materials, and is a lightweight heat-insulating flame retardant with uniform pore distribution and high strength.

Description

1. Technical field [0001] The invention belongs to the field of porous ceramic materials. In particular, it relates to a light-weight thermal insulation refractory material with periclase, spinel and corundum as main phase components and a preparation method thereof. 2. Background technology [0002] Most of the existing lightweight thermal insulation refractory materials are aluminum-silicon materials. The main chemical composition is Al 2 o 3 with SiO 2 . The main phases are corundum, mullite, quartz phase and glass phase. With the improvement of steel quality and variety requirements, the requirements for steel purity are getting higher and higher. Basic refractories are considered to be an ideal refractory material that can meet the requirements of pure steel production. In general, basic refractory materials, such as magnesia bricks, are directly used as furnace lining materials that are in direct contact with molten steel, and a layer of thermal insulation mater...

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Problems solved by technology

[0003] "A magnesium-aluminum lightweight thermal insulation refractory material and its preparation method" (CN200410013257.7) technology, although the produced lightweight thermal insulation material is an alkaline lightweight thermal insulation material, its raw materials are magnesite powder, Lightly burned magnesia powder, high alumina bauxite powder, Al(OH) 3 Powder, incinerable powder, the firing temperature is 1300-1500°C, the impurity content is relatively high, and the firing temperature is low, which leads to restrictions on the use temperature and use parts of the finished product

[0004] There are two reports on magnesium-aluminum lightweight materials: one entitled "Preparation of gel-injected corundum-spinel porous ceramics" (Liu Zuocai, Chen Ying. Gel-injected corundum-spinel porous ceramics Preparation of ceramics. The technology of Beijing Institute of Technology, 2005 (11)) describes the use of platy corundum and aluminum-rich spinel as the main raw materials, using organic monomers, cross-linking agents, catalysts, initiators, pore-forming agent, etc., the highest firing temperature is 1550 ° C, and the porous corundum-spinel material is prepared, but the process is complicated and the firing temperature is low, so the application range is also limited

[0005] Another article entitled "The effect of adding light-burned magnesia on the sintering performance of magnesia-aluminum spinel lightweight refractories" (Sun Lifeng, Yu Jingkun. Adding light-burned magnesia on the sintering properties of magnesia-aluminum spinel The impact of. Materials and Metallurgy Acta, 2004 (2)) technology, describes the use of industrial alumina, dead-burned magnesia, light-burned magnesia, pore-forming agent and binder as raw materials, the highest firing temperature is 1600 ° C, Although light-weight magnesium-aluminum spinel materials have been prepared, the process is complicated and the firing temperature is low, so the scope of application is also limited