CN114149231A - Low-heat-conduction heat preservation method, low-heat-conduction material and preparation method thereof - Google Patents

Low-heat-conduction heat preservation method, low-heat-conduction material and preparation method thereof Download PDF

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Publication number
CN114149231A
CN114149231A CN202111552511.0A CN202111552511A CN114149231A CN 114149231 A CN114149231 A CN 114149231A CN 202111552511 A CN202111552511 A CN 202111552511A CN 114149231 A CN114149231 A CN 114149231A
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China
Prior art keywords
parts
heat
particle size
vermiculite
meshes
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CN202111552511.0A
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Chinese (zh)
Inventor
崔明奎
崔原豪
崔乘豪
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Zhengzhou Jinyulong Refractory Co ltd
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Zhengzhou Jinyulong Refractory Co ltd
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Priority to CN202111552511.0A priority Critical patent/CN114149231A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/06Aluminous cements
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25CPROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/08Cell construction, e.g. bottoms, walls, cathodes
    • C25C3/085Cell construction, e.g. bottoms, walls, cathodes characterised by its non electrically conducting heat insulating parts
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0087Uses not provided for elsewhere in C04B2111/00 for metallurgical applications
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention relates to the technical field of preparation of heat-insulating materials, in particular to a low-heat-conduction heat-insulating method, wherein an aluminum foil or a tin foil is covered on the surface of a low-heat-conduction heat-insulating material, and the actual thickness of the heat-insulating material is reduced; the low-heat-conduction heat-insulation material comprises the following components in parts by weight: 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 10-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement; the specification of the vermiculite is flake vermiculite, the particle size of the flake vermiculite is less than or equal to 1.5mmm, the particle size of floating beads is 20-40 meshes, the particle size of clay powder is 120-250 meshes, the particle size of alumina powder is 160-320 meshes, the particle size of silica micropowder is 180-1000 meshes, the particle size of perlite is less than or equal to 1mm, and the specification of aluminate cement is CA-80. By adopting the low-aluminum heat-insulating material, the corrosion resistance is improved while the heat-insulating effect is good, and the later maintenance cost of the electrolytic cell is greatly saved.

Description

Low-heat-conduction heat preservation method, low-heat-conduction material and preparation method thereof
Technical Field
The invention relates to the technical field of preparation of heat insulation materials, in particular to a low-heat-conduction heat insulation material.
Background
The existing mode for improving the heat preservation performance of the heat preservation material is mainly to reduce the heat conductivity coefficient and improve the heat preservation performance by improving the raw material components or the processing technology.
The electrolytic cell is mainly used for refining metal in the metal refining industry, and refining high-purity metal is realized through electrolytic deposition; in the operation process of the electrolytic cell, a certain temperature needs to be kept so as to improve the electrolysis efficiency and reduce the energy consumption.
The existing electrolytic cell heat-insulating layer has two modes of castable and prefabricated plate, and is mostly made of medium and high-alumina heat-insulating materials, so that the heat-insulating effect is good, but the electrolyte leakage is easy to occur in the use process of the electrolytic cell, and the heat-insulating layer can be corroded, so that the maintenance frequency is long, the maintenance cost is increased, and the operation efficiency is reduced.
Disclosure of Invention
The invention aims to provide a low-heat-conduction heat-insulation material, which adopts a low-aluminum heat-insulation material, has good heat-insulation effect, improves the anti-corrosion performance, and greatly saves the later maintenance cost of an electrolytic cell.
In order to solve the technical problems, the invention adopts the following technical scheme:
the low heat conduction heat preservation method is to cover aluminum foil or tin foil on the surface of the low heat conduction heat preservation material and reduce the actual thickness of the heat preservation material.
The low-heat-conduction heat-insulation material comprises the following components in parts by weight: 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 10-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement.
Further, the specification of the vermiculite is flake vermiculite, the particle size of the flake vermiculite is less than or equal to 1.5mmm, the particle size of floating beads is 20-40 meshes, the particle size of clay powder is 120-250 meshes, the particle size of alumina powder is 160-320 meshes, the particle size of silica micropowder is 180-1000 meshes, the particle size of perlite is less than or equal to 1mm, and the specification of aluminate cement is CA-80.
The processing method of the low-heat-conduction heat-insulation material sequentially comprises the following steps of:
step a, batching: selecting 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 10-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement according to parts by weight;
step b, mixing materials: b, placing the ingredients in the step a into a stirrer, adding 30-40 parts of aluminum dihydrogen phosphate, 5-10 parts of silica sol, 3-8 parts of yellow dextrin and 3-5 parts of a waterproof agent according to parts by weight, and uniformly mixing;
step c, ageing: b, placing the uniformly mixed materials in the step b in a sealed space for ageing for 10-24 hours;
step d, forming: c, pressing and forming the material subjected to ageing in the step c;
step e, maintenance: d, maintaining the blank formed in the step d;
step f, drying: drying the blank cured in the step e until the water content is less than 0.5%, and obtaining a semi-finished product after drying;
step g, film covering: and f, covering an aluminum foil or a tin foil outside the surface of the semi-finished product produced in the step f, wherein the aluminum foil or the tin foil is bonded through heat-resistant glue.
Further, the water repellent is an organosilicon water repellent.
Further, the specification of the vermiculite is flake vermiculite, the particle size of the flake vermiculite is less than or equal to 1.5mmm, the particle size of floating beads is 20-40 meshes, the particle size of clay powder is 120-250 meshes, the particle size of alumina powder is 160-320 meshes, the particle size of silica micropowder is 180-1000 meshes, the particle size of perlite is less than or equal to 1mm, and the specification of aluminate cement is CA-80.
Further, the curing temperature is 15-60 ℃, and curing is carried out for 3-7 days.
Further, the drying temperature is 200-300 ℃.
Compared with the prior art, the invention can at least achieve one of the following beneficial effects:
1. the corrosion resistance is remarkable, and the structure is firm; flaky vermiculite is used as a main raw material, so that a cross structure is formed inside the product in the forming process, and the corrosion resistance is improved.
2. The strength is high; the mixed binding agent (aluminum dihydrogen phosphate, silica sol and yellow dextrin) is adopted, and can be combined with the matrix raw material at normal temperature to generate stronger strength.
3. The heat insulation performance is good; the vermiculite with the flaky structure reduces through air holes in the product, and can effectively reduce heat transfer.
4. The high-temperature shrinkage rate is small; the expansion agent (perlite) is added, so that the whole shrinkage of the product is small at a high temperature, and the product can be used after being dried at a low temperature.
5. Energy is saved; on one hand, the heat conductivity coefficient of the product is very low, so that the heat dissipation energy consumption in an application scene can be reduced; on the other hand, the product is a non-fired product, and the energy consumption of firing is saved in the preparation and processing process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The low heat conduction heat preservation method is to cover aluminum foil or tin foil on the surface of the low heat conduction heat preservation material and reduce the actual thickness of the heat preservation material.
The heat insulation performance of the heat insulation material can be improved, particularly, the heat conductivity coefficient is reduced by 30-60% within the range of 400-600 ℃, meanwhile, the thickness of the heat insulation material can be reduced on the premise of ensuring the heat insulation performance, and the cost is saved.
The low-heat-conduction heat-insulation material comprises the following components in parts by weight: 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 8-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement.
Further, the specification of the vermiculite is flake vermiculite, the particle size of the flake vermiculite is less than or equal to 1.5mmm, the particle size of floating beads is 20-40 meshes, the particle size of clay powder is 120-250 meshes, the particle size of alumina powder is 160-320 meshes, the particle size of silica micropowder is 180-1000 meshes, the particle size of perlite is less than or equal to 1mm, and the specification of aluminate cement is CA-80.
In the invention:
typical but non-limiting parts by weight of vermiculite are for example: 40 parts, 45 parts, 50 parts, 58 parts or 60 parts;
after the vermiculite is heated to 200-300 ℃, vermicular peeling can be generated along the C axis of the crystal of the vermiculite, and a cross structure is formed in the vermiculite after drying and forming, so that the structural firmness is improved, and the erosion resistance is improved.
Typical but non-limiting parts by weight of the floating beads are for example: 5 parts, 8 parts, 10 parts, 12 parts or 15 parts;
the floating beads can improve the strength and the heat insulation performance of the material and reduce the heat conductivity.
Typical but non-limiting parts by weight of the clay powder are for example: 3 parts, 4 parts, 5 parts, 6 parts or 8 parts;
the clay powder has good binding performance and plasticity, and is convenient for the molding stability of the material after drying.
Typical but non-limiting parts by weight of alumina powder are for example: 5 parts, 6 parts, 7 parts, 8 parts or 10 parts;
the alumina powder has good high-temperature resistance, and can be used as a reinforcing and toughening material of the heat-insulating material to improve compactness, smoothness, cold and hot fatigue, fracture toughness and the like.
Typical but non-limiting parts by weight of the silica fume are, for example: 8 parts, 10 parts, 12 parts, 13 parts or 15 parts;
the silica powder can reduce the phenomena of precipitation and delamination in the process of stirring the materials, and simultaneously enhances the compressive strength and the wear resistance of a condensate and increases the flame retardant property; the material has the effects of filling air holes and sealing air holes, and can improve the overall performance of the material.
Typical but non-limiting parts by weight of perlite are for example: 10 parts, 11 parts, 13 parts, 14 parts or 15 parts;
the expanded perlite is beneficial to forming a good crystal phase structure by various materials in the later-stage material drying and forming process so as to improve the performance of the material.
Typical but non-limiting parts by weight of aluminate cement are for example: 3 parts, 4 parts, 5 parts, 6 parts or 8 parts;
the corrosion-resistant heat-insulating material is prepared by taking scaly vermiculite with good corrosion resistance as a base material and combining a plurality of binding agents, and has the following remarkable effects:
the corrosion resistance is remarkable, and the structure is firm; flaky vermiculite is used as a main raw material, so that a cross structure is formed inside the product in the forming process, and the corrosion resistance is improved.
The strength is high; the mixed binding agent (aluminum dihydrogen phosphate, silica sol and yellow dextrin) is adopted, and can be combined with the matrix raw material at normal temperature to generate stronger strength.
The heat insulation performance is good; the vermiculite with the flaky structure reduces through air holes in the product, and can effectively reduce heat transfer.
The high-temperature shrinkage rate is small; the expansion agent (perlite) is added, so that the whole shrinkage of the product is small at a high temperature, and the product can be used after being dried at a low temperature.
The processing method of the low-heat-conduction heat-insulation material sequentially comprises the following steps of:
step a, batching: selecting 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 8-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement according to parts by weight;
step b, mixing materials: b, placing the ingredients in the step a into a stirrer, adding 30-40 parts of aluminum dihydrogen phosphate, 5-10 parts of silica sol, 3-8 parts of yellow dextrin, 3-5 parts of a waterproof agent and 5-15 parts of water according to parts by weight, and uniformly mixing;
step c, ageing: b, placing the uniformly mixed materials in the step b in a sealed space for ageing for 10-24 hours;
step d, forming: c, pressing and forming the material subjected to ageing in the step c;
step e, maintenance: d, maintaining the blank formed in the step d;
step f, drying: and e, drying the blank cured in the step e until the water content is less than 0.5%, and obtaining a finished product after drying.
In step b of the present invention:
typical but not limiting percentages by mass of aluminium dihydrogen phosphate are for example: 30 parts and 33 parts; 35 parts, 38 parts or 40 parts;
the aluminum dihydrogen phosphate is used as the adhesive, forms high bonding strength with other materials, has high folding resistance, compression resistance and hydration resistance after being baked at high temperature, does not soften even being soaked or boiled in water, and improves the strength and the corrosion resistance of the material.
Typical but non-limiting percentages by mass of silica sol are for example: 5 parts, 6 parts, 8 parts, 9 parts or 10 parts;
the silica sol is used as an adhesive, so that the plasticity in the manufacturing process can be improved, and the high temperature resistance, aging resistance and other performances of the material can be improved.
Typical but not limiting mass percentages of yellow dextrins are for example: 3 parts, 4 parts, 6 parts, 7 parts or 8 parts;
the yellow dextrin solution can improve the plasticity of the mixed materials and is convenient for forming.
Typical but not limiting mass percentages of water repellents are for example: 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts;
the water-proofing agent is an organic silicon water-proofing agent (purchased from Henan Cor Liao Gao New materials Co., Ltd.), can play a role of a water-reducing agent and a reinforcing agent, and prevents liquid materials from being immersed, so that the corrosion resistance of the material is improved.
Step c, ageing: b, placing the uniformly mixed materials in the step b in a sealed space for ageing for 10-24 hours;
in step c of the present invention:
typical but non-limiting ageing times are for example: 10 hours, 15 hours, 18 hours, 20 hours, or 24 hours.
So that the distribution of various components in the material is more uniform, and the forming performance of the material can be improved.
And f, drying: the drying temperature is 200-300 ℃;
in step f of the present invention:
typical but non-limiting drying temperatures are for example: 200 degrees celsius, 225 degrees celsius, 250 degrees celsius, 275 degrees celsius, or 300 degrees celsius.
The processing of the material can be finished by adopting the matching of various corresponding raw materials and drying in a relatively low-temperature environment; the product is a baking-free product, and the energy consumption of baking is saved in the preparation and processing process. The production cost and the later maintenance cost of the electrolytic cell are combined, the thermal insulation material is used as the thermal insulation layer of the electrolytic cell, the total cost is saved by 25-34%, and the energy consumption is saved by more than 30%.
In the early stage, the temperature is raised at a low temperature stage at a low temperature rate, so that the uniformity of the temperature of the dry blank can be improved, the cracking phenomenon caused by uneven temperature in the early stage is avoided, the temperature is raised to a larger extent in the later stage after the moisture is basically dried, the porosity can be reduced, the microcrystal forming effect between materials is improved, and the drying quality is improved.
Preferably, in the mixing material in the step b, the powder with smaller particle size is mixed firstly, and then the material with larger particle size is mixed, which is equivalent to reducing the mixing time of the granules, and can reduce the phenomena of sedimentation and delamination generated in the stirring process of the powder and the granules.
Preferably, in the step c, the uniformly mixed material in the step b is placed in a plastic woven bag for sealing, and then ageing is carried out for 10-24 hours. Arrange the material in the plastic woven bag and seal up the predicament material, can place the braided bag stack on the one hand, save space, on the other hand, after the predicament material of being convenient for, directly pour the material into mould, convenient and fast through the braided bag.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (8)

1. The low heat conduction heat preservation method is characterized in that: and covering aluminum foil or tin foil on the surface of the low-heat-conduction heat-insulation material, and reducing the actual thickness of the heat-insulation material.
2. Low heat conduction insulation material, its characterized in that: according to the parts by weight, the composition comprises: 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 8-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement.
3. The low thermal conductivity thermal insulation material according to claim 2, wherein: the specification of the vermiculite is flake vermiculite, the particle size of the flake vermiculite is less than or equal to 1.5mmm, the particle size of floating beads is 20-40 meshes, the particle size of clay powder is 120-250 meshes, the particle size of alumina powder is 160-320 meshes, the particle size of silica micropowder is 180-1000 meshes, the particle size of perlite is less than or equal to 1mm, and the specification of aluminate cement is CA-80.
4. The processing method of the low-heat-conduction heat-insulation material is characterized by comprising the following steps of: the method sequentially comprises the following steps: step a, batching: selecting 40-60 parts of vermiculite, 5-15 parts of floating beads, 3-8 parts of clay powder, 5-10 parts of alumina powder, 8-15 parts of silica micropowder, 10-15 parts of perlite and 3-8 parts of aluminate cement according to parts by weight; step b, mixing materials: b, placing the ingredients in the step a into a stirrer, adding 30-40 parts of aluminum dihydrogen phosphate, 5-10 parts of silica sol, 3-8 parts of yellow dextrin and 3-5 parts of a waterproof agent according to parts by weight, and uniformly mixing; step d, forming: c, pressing and forming the material mixed in the step b; step e, maintenance: d, maintaining the blank formed in the step d; step f, drying: drying the blank cured in the step e until the water content is less than 0.5%; obtaining a semi-finished product after drying; step g, film covering: and f, covering an aluminum foil or a tin foil outside the surface of the semi-finished product produced in the step f, wherein the aluminum foil or the tin foil is bonded through heat-resistant glue.
5. The method for processing the erosion resistant heat insulating material for the electrolytic cell as set forth in claim 3, wherein: the waterproof agent is an organosilicon waterproof agent.
6. The method for processing the erosion resistant heat insulating material for the electrolytic cell as set forth in claim 3, wherein: the specification of the vermiculite is flake vermiculite, the particle size of the flake vermiculite is less than or equal to 1.5mmm, the particle size of floating beads is 20-40 meshes, the particle size of clay powder is 120-250 meshes, the particle size of alumina powder is 160-320 meshes, the particle size of silica micropowder is 180-1000 meshes, the particle size of perlite is less than or equal to 1mm, and the specification of aluminate cement is CA-80.
7. The method for processing the erosion resistant heat insulating material for the electrolytic cell as set forth in claim 3, wherein: and curing for 3-7 days at the curing temperature of 15-60 ℃.
8. The method for processing the erosion resistant heat insulating material for the electrolytic cell as set forth in claim 3, wherein: the drying temperature is 200-300 ℃.
CN202111552511.0A 2021-12-17 2021-12-17 Low-heat-conduction heat preservation method, low-heat-conduction material and preparation method thereof Pending CN114149231A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201824599U (en) * 2010-09-01 2011-05-11 南京恒翔保温材料制造有限公司 Novel aluminium foil and rock wool board
CN104311040A (en) * 2014-04-03 2015-01-28 郑州金瑜隆隔热材料有限公司 Powder for preparing magnesium-silicon hard insulation board, magnesium-silicon hard insulation board and preparation method thereof
CN204185948U (en) * 2014-04-30 2015-03-04 安英居 Composite insulation boards
CN204313651U (en) * 2014-12-03 2015-05-06 济南大学 A kind of kiln silico-calcium/aluminum foil composite heat insulation board
CN205399701U (en) * 2016-02-26 2016-07-27 佛山市呈阳新材科技有限公司 Environment -friendly tectorial membrane heated board
CN108751966A (en) * 2018-07-03 2018-11-06 贵州大学 A kind of technique of ardealite and the hard heat-insulated plate coproduction acid of red mud furnace lining

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201824599U (en) * 2010-09-01 2011-05-11 南京恒翔保温材料制造有限公司 Novel aluminium foil and rock wool board
CN104311040A (en) * 2014-04-03 2015-01-28 郑州金瑜隆隔热材料有限公司 Powder for preparing magnesium-silicon hard insulation board, magnesium-silicon hard insulation board and preparation method thereof
CN204185948U (en) * 2014-04-30 2015-03-04 安英居 Composite insulation boards
CN204313651U (en) * 2014-12-03 2015-05-06 济南大学 A kind of kiln silico-calcium/aluminum foil composite heat insulation board
CN205399701U (en) * 2016-02-26 2016-07-27 佛山市呈阳新材科技有限公司 Environment -friendly tectorial membrane heated board
CN108751966A (en) * 2018-07-03 2018-11-06 贵州大学 A kind of technique of ardealite and the hard heat-insulated plate coproduction acid of red mud furnace lining

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