Porous periclase-magnesium-iron-aluminum composite spinel ceramic material and preparation method thereof

Abstract

The invention relates to a porous periclase-magnesium-iron-aluminum composite spinel ceramic material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: heating magnesite fine powder to 650-750 DEG C, keeping the temperature, heating to 1000-1200 DEG C, and keeping the temperature to obtain a periclase-olivine composite powder; then, taking 60 to 87wt% of the periclase-olivine composite powder, 0.1 to 5wt% of iron oxide powder, 3 to 20wt% of an aluminum sol and 5 to 20wt% of aluminum hydroxide micro powder as raw materials, putting the raw materials into a vacuum stirrer, vacuumizing to 2.0 kPa or below, stirring, keeping the temperature at 110-220 DEG C, cooling to obtain a mixed powder, carrying out mechanical pressing, and drying; and finally, carrying out heat preservation at 600-900 DEG C and 1550-1600 DEG C correspondingly, and carrying out furnace cooling to obtain the porous periclase-magnesium-iron-aluminum composite spinel ceramic material. The preparation method is low in production cost and environment-friendly, and the prepared product has the characteristics of small volume density, low air permeability, low heat conductivity coefficient, high strength and good erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic materials. In particular, it relates to a porous periclase-magnesium-iron-aluminum composite spinel ceramic material and a preparation method thereof. Background technique [0002] At present, organic waste accounts for about 50-60% of urban solid waste, and the combustible components are very high. Using it as an alternative fuel and using cement kilns to co-process urban solid waste not only saves energy, but also realizes waste recycling. "Harmless, resourceful, and reduced" treatment. Insulation and refractory materials are important basic materials for reducing the heat dissipation loss of thermal equipment in the cement industry. The saline and alkali and heavy metal oxides introduced after the combustion of alternative fuels have strong chemical aggressiveness, and will be used for thermal insulation and refractory of existing cement thermal equipment. Material performance poses se...

AI Technical Summary

Problems solved by technology

[0006] "Nano-aperture porous periclase-magnesia-aluminum spinel ceramic material and its preparation method" (CN201710632854.5) patent technology, using magnesite and aluminum sol as main raw materials, although magnesite self-decomposition is used to synthesize porous square Magnesite-magnesia aluminum spinel ceramics, but the grade of magnesite is higher (MgO content is 44% to 50%), resulting in higher production costs

[0007] "Magnesia Porous Thermal Insulation Material and Its Preparation Method" (CN201510310716.6) patent technology and literature technology (Li Meiting, Luo Xudong, Zhang Guodong, Xie Zhipeng, Li Jiguang, Du Jian. Preparation of magnesia porous materials by foaming method and sol-gel method. Inorganic Salt Industry, 2017, 49 (01): 19-21+55) uses magnesite flotation tailings and fused magnesia as the main raw materials, and adopts the foaming method to produce magnesia porous insulation materials, but the resulting products Large pore size, high porosity, low strength, poor resistance to saline alkali and heavy metal oxide erosion, difficult to meet the use of alternative fuel environments

[0008] Literature technology (Gao Huinan, Chen Shujiang, Li Guohua, Han Lu. Preparation of magnesia porous raw materials by sintering method and burn-out method. Refractories, 2018, 52(03):180-183.) High-purity magnesia is used as the main raw material, and polystyrene Balls and carbon microspheres are pore-forming agents. Although magnesium-based thermal insulation materials are produced, the products have large pore diameters, low strength, poor corrosion resistance, and high raw material costs. The burning of pore-forming agents will produce harmful gases and pollute the environment.