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Porous light heat insulating refractory materials and preparation method thereof
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A technology for thermal insulation and light-weight thermal insulation, applied in the field of refractory materials, can solve the problems of low use temperature, low impact on strength, low thermal conductivity of anorthite, etc.
Active Publication Date: 2009-04-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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[0005] The purpose of the present invention is to solve the problems that the current anorthite series lightweight refractory bricks used for kiln lining are not high in use temperature and low in strength, which affects the service life, and the thermal conductivity of mullite lightweight refractory bricks is high, which affects the energy-saving effect. Utilizing the characteristics of mullite's good high temperature resistance and low thermal conductivity of anorthite, a porous lightweight heat-insulating refractory brick containing mullite and anorthite and its preparation method are proposed to achieve high-efficiency energy-saving and high-strength preparation , long-life high-temperature industrial kiln lining with lightweight refractory bricks, thereby contributing to energy saving in high-temperature industries
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preparation example Construction
[0019]A preparation process of a porous lightweight thermal insulation refractory material is as follows:
[0023] The amount of limestone added is 7.5wt.%, requiring CaCO 3 ≥98.0%, less than 0.10mm; calcined high-aluminum low-iron clay added 40.5wt.%, requiring Al 2 o 3 Content greater than 30.0wt.%, SiO 2 Content greater than 35.0wt.%, Fe 2 o 3 Content ≤1.2wt.%, TiO 2 The content is ≤1.0wt.%, less than 0.10mm; the addition of kyanite is 13.0wt.%, requiring Al 2 o 3 The content is greater than 40.0wt.%, Fe 2 o 3 Content ≤ 1.0wt.%, TiO 2 The content is ≤0.7wt.%; the addition of hemihydrategypsum is 5.0wt.%, requiring CaSO 4 1 / 2H 2 O≥98.0%, less than 0.10mm; the amount of industrial alumina added is 34.0wt.%, requiring γ-Al 2 o 3 ≥98.0%, less than 0.10mm.
[0025] Firstly, various raw materials are loaded into a mill according to the above proportions and ground until the sieve residue of a sieve with an aperture of less than 0.060 mm is less than 2.0 wt.%.
[0026] Add pore forming agent and stir to form...
Embodiment 2
[0038] Raw materials and ratio:
[0039] The addition of quicklime is 9.2wt.%, requiring CaO ≥ 98.0%, less than 0.10mm; the addition of calcined high-alumina and low-iron clay is 45.5wt.%, requiring Al 2 o 3 Content greater than 30.0wt.%, SiO 2 Content greater than 35.0wt.%, Fe 2 o 3 Content ≤1.2wt.%, TiO 2 The content is ≤1.0wt.%, less than 0.10mm; the addition of kyanite is 12.0wt.%, requiring Al 2 o 3 The content is greater than 40.0wt.%, Fe 2 o 3 Content ≤ 1.0wt.%, TiO 2 The content is ≤0.7wt.%; the addition of hemihydrategypsum is 7.0wt.%, requiring CaSO 4 1 / 2H 2 O≥98.0%, less than 0.10mm; the amount of industrial alumina added is 26.3wt.%, requiring γ-Al 2 o 3 ≥98.0%, less than 0.10mm.
[0040] Ingredients, ball milling:
[0041] First, various raw materials are loaded into a ball mill according to the above-mentioned proportions and ball milled for 12 hours, and the raw materials are ground until the sieve residue of a sieve with an aperture of less than ...
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Abstract
The invention relates to a heat-insulation fireproofing material used for industrial furnaces, which is characterized by porosity and light weight, low thermal conductivity, high strength and good heat-insulation effects and belongs to the technical field of fireproofing materials. The invention prepares a porous and light heat-insulating fireproofing material with low thermal conductivity, high strength and good heat-insulation effects by using materials, such as lime stones or limes, kyanite, calcined high-alumina low-iron clays or alumina, industrial alumina, semi-hydrated gypsum and the like and by technical processes of composition design and regulation, adding organic / inorganic composite pore-forming agents, semidry vibration pouring shaping, conditioning controllable drying, high-temperature air introduction pore-forming, one-step in-situ reaction sintering, cutting process and the like. The main phases of the heat-insulation fireproofing material are mullite phase and anorthite phase; and the main chemical constituents Al2O3 plus SiO2 plus CaO are more than 90wt percent. The heat-insulation fireproofing material is a high-efficient, energy-saving, durable and light fireproofing brick used for high-temperature furnace lining and can provide guarantee of high-effective and energy-saving heat-insulation materials for industrial furnace devices.
Description
Technical field: [0001] The invention relates to a porous lightweight heat-insulating and heat-preserving refractory material for industrial kilns and a preparation method thereof, belonging to the field of refractory materials. Background technique: [0002] Industrial kilns are the main energy-consuming equipment in industrial production, and the annual energy consumption is huge. Especially in the thermal processing process in metallurgy, building materials, ceramics, glass, chemical and electromechanical enterprises, the energy consumption of industrial kilns can account for the total energy consumption. 40-70% of consumption. However, the heat loss of various industrial kilns is generally very large. In most cases, their thermal efficiency is low, and the energy utilization rate is less than 30%. The heat dissipation loss and heat storage loss of energy can achieve the purpose of energy saving. [0003] At present, aluminum silicaterefractory fibers, which are used i...
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