CN101597139B - Method for preparing foamed glass insulation board by coal ash - Google Patents

Method for preparing foamed glass insulation board by coal ash Download PDF

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Publication number
CN101597139B
CN101597139B CN2009100231819A CN200910023181A CN101597139B CN 101597139 B CN101597139 B CN 101597139B CN 2009100231819 A CN2009100231819 A CN 2009100231819A CN 200910023181 A CN200910023181 A CN 200910023181A CN 101597139 B CN101597139 B CN 101597139B
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China
Prior art keywords
flyash
insulation board
coal ash
foamed glass
cerium oxide
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Expired - Fee Related
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CN2009100231819A
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Chinese (zh)
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CN101597139A (en
Inventor
黄剑锋
曹丽云
李颖华
吴建鹏
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Shaanxi University of Science and Technology
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Shaanxi University of Science and Technology
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03CCHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C11/00Multi-cellular glass ; Porous or hollow glass or glass particles
    • C03C11/007Foam glass, e.g. obtained by incorporating a blowing agent and heating

Abstract

The invention relates to a method for preparing a foamed glass insulation board by coal ash. The coal ash and glass powder are respectively put into a ball mill for dry grinding and iron in the coal ash is removed, the coal ash after iron removal, glass powder after grinding and sieving and cerium oxide are dryly ground to form mixed material, the mixed material is put into a steel mould to be pressed into a flat green body; and the pressed green body is put into an aluminum oxide sagger which is evenly spread with aluminium oxide powder at the bottom, put into a silicon carbon rod resistance furnace to be sintered, cooled and annealed, thus obtaining the foamed glass insulation board. The coal ash is used for preparing the foamed glass insulation board in the invention, which is not only beneficial for saving natural resources and reducing production cost but also beneficial for environmental protection. The coal ash can be smashed without a high power crusher and is even in mixing; meanwhile the coal ash contains a great amount of hollow cenospheres and melikaria and has low heat conductivity and thermostability characteristics. The cerium oxide is used as foaming agent to cause foaming temperature to be easily controlled, so as to simplify technology and reduce energy consumption, thus being beneficial for industrialized production.

Description

A kind of method of utilizing the fly-ash Preparation foamed glass insulation board
Technical field
The present invention relates to utilize waste to prepare the technical field of glass, particularly utilize rejected fly ash to prepare the method for foamed glass insulation board.
Background technology
Multicellular glass is a kind of porous material of manual manufacture, it be a kind of inside be full of countless small, evenly be communicated with or the glass material of sealed porosity premium propertiess such as having that density is little, intensity is high, thermal conductivity is little, thermal expansivity is low, do not absorb water, be nonhygroscopic.It is as a kind of novel lagging material, with its weather resistance, security, reliability, good chemical stability, occupy more and more important position (Tian Yingliang in fields such as high temperature insulating, low temperature insulation, moistureproof engineering, sound absorption engineerings, Qu Peiyuan. Foam Glass Industry Development at Home and Abroad evolution and trend [J]. glass and enamel, 2002,30 (5): 48-52).
The development of China's multicellular glass starts from the fifties, the scientific and technical personnel that play industries such as China's light industry, building materials up to the eighties begin to adopt solid waste development and production multicellular glass, and developed rapidly (Xu Meijun. global in length and breadth: as to see the international situation [J] of multicellular glass. state's outdoor building materials science and technology, 2003 (4): 34-35).Utilize solid waste to prepare multicellular glass, usually with waste plate glass, container glass, flyash etc. are main raw material, the kind of whipping agent is more, mainly contain carbonate (lime carbonate, magnesiumcarbonate, yellow soda ash, salt of wormwood etc.), vitriol (sodium sulfate, calcium sulfate etc.) with carbon black three classes, adopt powder sintering, with the whipping agent uniform mixing in raw material, be placed in the particular manufacturing craft then, in the kiln of electricity or fuel heating, foam, the demoulding behind the solid type of cooling, blank after the demoulding enters in the annealing furnace and eliminates stress, and be cooled to the goods that cut into the shape and size of requirement after the room temperature (Wang Feitian. the production of multicellular glass and Application in Building present situation [J]. Sichuan building materials, 2003 (5): 22-23).This method complicated process of preparation, the cost height, temperature-controlled precision requires high, and the physical strength of product is lower.Produce in the production cost of multicellular glass with waste at home, heating energy source (fuel, electric heating) expense accounts for 1/2 of production cost, adopt the production technology of high-tech less energy-consumption just can have remarkable economic efficiency, also be that multicellular glass reduces price, one of the key promoted the use of.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of method of utilizing the fly-ash Preparation foamed glass insulation board is provided, not only raw material sources are extensive, production cost is low in the present invention, temperature is easy to control, and turning waste into wealth, but production machinery intensity height, even, the resistant to elevated temperatures foamed glass insulation board of pore.
For achieving the above object, the technical solution used in the present invention is:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, cross 100 mesh sieves then respectively, the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, the flyash after the deironing of learning from else's experience, dry grinding after sieving glass powder and cerium oxide with flyash: glass powder: cerium oxide=30~40%: 50~60%: 10~20% mass percent is put into ball mill for dry grinding and is formed compound;
3) then, compound is packed into make the flats base substrate in the steel die;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 5~10 ℃/min is warming up to 1150~1220 ℃ from room temperature earlier, insulation 1~3h; Speed of cooling with 15~20 ℃/min is cooled to 1000 ℃ then, insulation 30~60min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.
Step 1) of the present invention and step 2) in dry grinding be to utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2~3: 1, milling time is 0.5~3h;
The step 3) steel die is of a size of 200mm * 150mm * 20mm, and forming pressure is 5~20MPa.
Beneficial effect of the present invention is:
(1) main raw material of the present invention is the trade waste of coal-burning power plant's discharging, not only helps to save natural resource with the fly-ash Preparation foamed glass insulation board, reduces production costs, and helps environment protection.
(2) powdered coal ash is mainly micron-size spherical particles, compares with natural mineral, and raw material need not to use high-power crusher in crushing, and batch mixing is even; Simultaneously, there are a large amount of cenospheres and melikaria in the flyash, have low, the high-temperature stability of thermal conductivity.
(3) select for use hypotoxicity, highly active rare earth oxide cerium oxide as whipping agent, make blowing temperature be easy to control, simplify technology, reduce energy consumption, help industrialized production.
(4) not only pore is even for Zhi Bei foamed glass insulation board, and porosity is adjustable, and has light weight, high strength, lower thermal conductivity, good characteristic such as high temperature resistant.
Embodiment
Embodiment 1:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2: 1, milling time is 1h, crosses 100 mesh sieves then respectively, and the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, glass powder after flyash, the dry grinding after the deironing of learning from else's experience sieved and cerium oxide are with flyash: glass powder: the mass percent of cerium oxide=30%: 60%: 10% is put into ball mill for dry grinding, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2: 1, grinds 1h and forms compound;
3) then, compound being packed in the steel die of 200mm * 150mm * 20mm, is that 5MPa is pressed into the flats base substrate through handpress at pressure;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 5 ℃/min is warming up to 1200 ℃ from room temperature earlier, insulation 3h; Speed of cooling with 20 ℃/min is cooled to 1000 ℃ then, insulation 30min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.
Embodiment 2:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2.3: 1, milling time is 1.6h, crosses 100 mesh sieves then respectively, and the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, glass powder after flyash, the dry grinding after the deironing of learning from else's experience sieved and cerium oxide are with flyash: glass powder: the mass percent of cerium oxide=40%: 50%: 10% is put into ball mill for dry grinding, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2.3: 1, grinds 1.6h and forms compound;
3) then, compound being packed in the steel die of 200mm * 150mm * 20mm, is that 13MPa is pressed into the flats base substrate through handpress at pressure;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 8 ℃/min is warming up to 1150 ℃ from room temperature earlier, insulation 2h; Speed of cooling with 18 ℃/min is cooled to 1000 ℃ then, insulation 50min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.
Embodiment 3:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2.7: 1, milling time is 3h, crosses 100 mesh sieves then respectively, and the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, glass powder after flyash, the dry grinding after the deironing of learning from else's experience sieved and cerium oxide are with flyash: glass powder: the mass percent of cerium oxide=30%: 50%: 20% is put into ball mill for dry grinding, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2.7: 1, grinds 3h and forms compound;
3) then, compound being packed in the steel die of 200mm * 150mm * 20mm, is that 20MPa is pressed into the flats base substrate through handpress at pressure;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 10 ℃/min is warming up to 1170 ℃ from room temperature earlier, insulation 3h; Speed of cooling with 15 ℃/min is cooled to 1000 ℃ then, insulation 60min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.
Embodiment 4:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 3: 1, milling time is 0.5h, crosses 100 mesh sieves then respectively, and the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, glass powder after flyash, the dry grinding after the deironing of learning from else's experience sieved and cerium oxide are with flyash: glass powder: the mass percent of cerium oxide=33%: 55%: 12% is put into ball mill for dry grinding, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 3: 1, grinds 0.5h and forms compound;
3) then, compound being packed in the steel die of 200mm * 150mm * 20mm, is that 10MPa is pressed into the flats base substrate through handpress at pressure;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 6 ℃/min is warming up to 1220 ℃ from room temperature earlier, insulation 1h; Speed of cooling with 17 ℃/min is cooled to 1000 ℃ then, insulation 40min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.
Embodiment 5:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2.5: 1, milling time is 2h, crosses 100 mesh sieves then respectively, and the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, glass powder after flyash, the dry grinding after the deironing of learning from else's experience sieved and cerium oxide are with flyash: glass powder: the mass percent of cerium oxide=32%: 53%: 15% is put into ball mill for dry grinding, utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2.5: 1, grinds 2h and forms compound;
3) then, compound being packed in the steel die of 200mm * 150mm * 20mm, is that 16MPa is pressed into the flats base substrate through handpress at pressure;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 9 ℃/min is warming up to 1185 ℃ from room temperature earlier, insulation 2h; Speed of cooling with 16 ℃/min is cooled to 1000 ℃ then, insulation 35min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.

Claims (3)

1. method of utilizing the fly-ash Preparation foamed glass insulation board is characterized in that:
1) at first, flyash and glass powder are put into ball mill for dry grinding respectively, cross 100 mesh sieves then respectively, the flyash after sieving is adopted the permanent magnet deironing, adopt the electromagnetism deironing again, make Fe in the flyash 2O 3Content be lower than 0.5%;
2) secondly, select for use cerium oxide as whipping agent, the flyash after the deironing of learning from else's experience, dry grinding after sieving glass powder and cerium oxide with flyash: glass powder: cerium oxide=30~40%: 50~60%: 10~20% mass percent is put into ball mill for dry grinding and is formed compound;
3) then, compound is packed into make the flats base substrate in the steel die;
4) last, the base substrate that is pressed into is placed on the bottom surface evenly tiles in the aluminum oxide saggar of aluminum oxide powder, and place in the globars resistance furnace, the rate of heating with 5~10 ℃/min is warming up to 1150~1220 ℃ from room temperature earlier, insulation 1~3h; Speed of cooling with 15~20 ℃/min is cooled to 1000 ℃ then, insulation 30~60min; At last, promptly get foamed glass insulation board after being annealed to room temperature with the cooling of the speed of 5 ℃/min.
2. the method for utilizing the fly-ash Preparation foamed glass insulation board according to claim 1, it is characterized in that: said step 1) and step 2) in dry grinding be to utilize the alumina balls masonry to be grinding medium, the mass ratio of control abrading-ball and raw material is 2~3: 1, grinds 0.5~3h respectively.
3. the method for utilizing the fly-ash Preparation foamed glass insulation board according to claim 1 is characterized in that: said step 3) steel die is of a size of 200mm * 150mm * 20mm, and forming pressure is 5~20MPa.
CN2009100231819A 2009-07-03 2009-07-03 Method for preparing foamed glass insulation board by coal ash Expired - Fee Related CN101597139B (en)

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KR101081405B1 (en) * 2010-03-05 2011-11-08 주식회사지메텍 A ceramic composite, a porous ceramic insulator using the ceramic composite and Making method
CN101979358B (en) * 2010-10-15 2012-02-15 陕西科技大学 Method for manufacturing large-size ceramic wallboard
CN102531398A (en) * 2012-01-18 2012-07-04 刘福战 Method for preparing fly ash foam glass
CN107921492B (en) * 2015-02-17 2022-04-12 南洋理工大学 Method for producing lightweight materials

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SU1335544A1 (en) * 1986-01-30 1987-09-07 А.Б. Истру Foamed glass
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Publication number Priority date Publication date Assignee Title
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CN101113077A (en) * 2007-07-20 2008-01-30 内蒙古自治区建筑材料工业科学研究设计院 Preparation method of foam glass

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