CN104177119A - Preparation method of heat insulating porous ceramic made from light coal ash - Google Patents
Preparation method of heat insulating porous ceramic made from light coal ash Download PDFInfo
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Abstract
The invention relates to a preparation method of a heat insulating porous ceramic made from light coal ash. The preparation method comprises the following steps: (1) taking coal ash, ground glass, a dispersant and a foam stabilizer, and adding water to stir and ball-mill to obtain primary slurry; (2) preparing agar-containing stable ceramic slurry; (3) adding a surfactant and stirring and foaming to obtain foam slurry; (4) pouring the foam slurry into a die, and curing at room temperature; (5) demoulding and drying to obtain a porous ceramic blank; and (6) sintering the porous ceramic blank at a low temperature to obtain the porous ceramic. According to the preparation method provided by the invention, coal ash is utilized to the maximum extent. In addition, agar which is free from environmental pollution is decomposed as a gel, and the dosage of the agar can be reduced to 0.1wt%, so that the porous ceramic meets the low-carbon environment-friendly policy. The porosity of the porous ceramic prepared by the method is 88-91%, the density is 0.24-0.31g/cm<3>, the heat conductivity coefficient is 0.051-0.072W/(m.K) and the compressive strength is 0.4-1.0MPa.
Description
Technical field
The invention belongs to novel light lagging material technical field, that be specifically related to is a kind of preparation method of light flyash heat insulating porous ceramics.
Background technology
The present economy of China is in the period of high speed development, and the energy and environmental issue become increasingly conspicuous, and is just meeting the current strategy of sustainable development at the architectural energy-conserving and environment-protective strategy that carries out.Due to relation between supply and demand, the development of China's lagging material is extremely rapid.The advantages such as porous ceramics is little with its volume density, void content large, lower thermal conductivity, as heat preserving and insulating material, have huge development and application prospect in daily life and in producing.
When porous ceramics is used as heat preserving and insulating material, in guaranteed performance excellence, also need to consider its raw material sources and preparation technology.Than other ceramic raw materials, flyash easy-sintering generates mullite ceramic, and with low cost, to utilization of waste material, improve the aspects such as environment and have special potential using value.Therefore, utilize flyash solid waste, research and develop a kind of production cost low, have the environment-friendly type refractory materials of lightweight, insulation, heat insulating function concurrently simultaneously, realize comprehensive utilization of resources, both can solve problem of environmental pollution, make again resource be utilized effectively, no matter be social benefit or economic benefit, be all with a wide range of applications.Nowadays the main preparation technology of porous ceramics has: microwave heating, interpolation pore-forming material, sol-gel processing, organic foam coating, particle packing, foaming etc.The people such as Li Shaorong prepare porous ceramics taking organic resin foam microspheres as pore-forming material, its aperture is evenly, size is controlled, but organic pore-forming agents while burnouting the gas of discharge pollute the environment, and do not meet environmental protection policy; The people such as Wu Yongbin prepare porous ceramic composite with protein foaming, do not produce the objectionable impurities of contaminate environment, but more protein adds and a large amount of gases of the discharge of finally burnouting, and do not meet low-carbon environment-friendly policy.
Summary of the invention
Object of the present invention, provides taking flyash as raw material, utilizes the preparation method of the heat insulating porous ceramics of the curing a kind of low cost combining of mechanical stirring foaming and agar gel, lightweight, high porosity, lower thermal conductivity.
The preparation method of light flyash heat insulating porous ceramics comprises raw material powder coal ash 30～40wt%, agar powder 0.1～0.5wt%, suds-stabilizing agent 0.15～0.2wt%, dispersion agent 0.1～0.15wt%, the glass powder 0～4wt% of following mass percent, whipping agent 0.3～0.5wt% and water 54.65～64.75wt%;
Described suds-stabilizing agent is Sodium hexametaphosphate 99, and described dispersion agent is sodium polyacrylate, and described whipping agent is sodium lauryl sulphate or Sodium dodecylbenzene sulfonate;
Preparation manipulation step is:
(1) by flyash, glass powder, dispersion agent and suds-stabilizing agent, add water and stir rear ball milling, obtain elementary slurry;
(2) preparation is containing the stable ceramic size of agar;
(3) add tensio-active agent, stir the foamed slurry that foams to obtain;
(4) foamed slurry is poured in mould into self-vulcanizing;
(5) demoulding is dried to obtain porous ceramics green compact;
(6) by porous ceramics green compact sintering in low-temperature sintering stove, obtain porous ceramics.
The porosity of described porous ceramics is 88～91wt%, and density is 0.24～0.31g/cm
3, thermal conductivity is 0.051～0.072 W/ (mK), ultimate compression strength is 0.4～1.0MPa.The porosity of porous ceramics prepared by the present invention is 88～91wt%, and density is 0.24～0.31g/cm
3, thermal conductivity is 0.051～0.072 W/ (mK), ultimate compression strength is 0.4～1.0MPa.
Compared with existing porous ceramics heat preserving and insulating material, advantage of the present invention is:
1, the porous ceramics that prepared by the present invention has uniform spherical honeycomb porous structure unit, and hole wall is interconnected with hole window, and porosity can reach more than 88%, and sample surfaces is regular, forming;
2, the present invention adopts frothy gel injection molding preparation technology, and stirring foaming technique is combined with slip-casting shaping process, and it is simple that this technique has degreasing process, feature with short production cycle, and the hole rounding of prepared porous ceramics, strength ratio is higher;
3, the porous ceramics raw material that prepared by the present invention is flyash solid waste, other are indium addition thing, after sintering, finished product component almost comes from flyash completely, can utilize to greatest extent solid waste, both solved problem of environmental pollution, make again resource be utilized effectively, this is with a wide range of applications; In addition adopt agar as gelifying agent, consumption considerably less (can be low to moderate 0.1wt%), and can emit a small amount of carbonic acid gas and water by after-flame when sintering, and do not have other to pollute nuisance, meet low-carbon environment-friendly policy.
Brief description of the drawings
Fig. 1 is the surface picture figure of embodiment 3 finished product, the upper surface photo figure that wherein Fig. 1 (a) is finished product, the lower surface photo figure that Fig. 1 (b) is finished product.
Fig. 2 is the micro-structure diagram (scanning electronic microscope) of embodiment 3 finished product sections, and wherein Fig. 2 (a) is the scanning electron microscope diagram of 50 times, and Fig. 2 (b) is the scanning electron microscope diagram of 200 times.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Raw materials used in following examples: flyash is thin ash, crosses 100 mesh sieves; Be taken from fuel-burning power plant, Hefei, main component is Al
2o
3and SiO
2; The main component of glass powder is SiO
2and CaO, specifically adopt discarded glass through ball milling 24h, cross 100 mesh sieves; Agar powder (purifying, biochemical reagents) is Chemical Reagent Co., Ltd., Sinopharm Group's production; Sodium hexametaphosphate 99 (PAAS), sodium lauryl sulphate (K12), Sodium dodecylbenzene sulfonate (SDBS) are Chemical Reagent Co., Ltd., Sinopharm Group and produce; The molecular weight MW of the sodium polyacrylate (SHMP) of high molecular is 500～8,000,000, is purchased from Aladdin reagent (China) company limited.
Embodiment 1
Feed composition weight percent is: flyash 35wt%, agar powder 0.3wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 64.05wt%.
The concrete operation step of preparing heat insulating porous ceramics is as follows:
(1) press above-mentioned raw materials proportioning, 57.47g flyash, 0.16gPAAS, 0.25g SHMP and 72.53g water are added to ball mill, drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.38g agar powder is joined in 25g water, under 90 DEG C of conditions of temperature, dissolve and obtain the agar water-sol; Get elementary slurry 95g, elementary slurry is bathed to preheating at temperature 60 C Water Under, add the agar water-sol, under low speed 400 rpm conditions, agitator stirs and makes it fully to mix for about about two minutes, the uniform and stable ceramic size that acquisition solid content is 35wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, under 1800 rpm conditions, agitator stirs fully foaming in about 5 minutes at a high speed, and slurry will produce a large amount of foams, and volume is about 3 times of former slurry, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtain base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 90.64%, and density is 0.2561 g/cm
3, thermal conductivity is 0.0546 W/ (mK), ultimate compression strength is 0.56MPa.
Embodiment 2
Feed composition weight percent is: flyash 40wt%, agar powder 0.3wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 59.05wt%.
The concrete operation step of preparing heat insulating porous ceramics is as follows:
By 67.20g flyash, 0.17gPAAS, 0.25gSHMP and 72.80g water add ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.38g agar powder is added in 20g water, under 90 DEG C of conditions of temperature, dissolve and obtain the agar water-sol; Get elementary slurry 100g, elementary slurry is bathed to preheating at temperature 60 C Water Under, add the agar water-sol, under low speed 400 rpm conditions, agitator stirs and makes it fully to mix for about about two minutes, the uniform and stable ceramic size that acquisition solid content is 40wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, under 1800 rpm conditions, agitator stirs fully foaming in about 5 minutes at a high speed, and slurry will produce a large amount of foams, and volume is about 2.7 times of former slurry, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtain base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 88.92%, and density is 0.3035 g/cm
3, thermal conductivity is 0.0630 W/ (mK), ultimate compression strength is 0.78MPa.
Embodiment 3
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 64.15wt%.
The concrete operation step of preparing heat insulating porous ceramics is as follows:
By 57.47g flyash, 0.16gPAAS, 0.25gSHMP and 72.53g water add ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, under 90 DEG C of conditions of temperature, dissolve and obtain the agar water-sol; Get elementary slurry 95g, elementary slurry is bathed to preheating at 55 DEG C of Water Unders of temperature, add the agar water-sol, under low speed 400 rpm conditions, agitator stirs and makes it fully to mix for about about two minutes, the uniform and stable ceramic size that acquisition solid content is 35wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, under 1800 rpm conditions, agitator stirs fully foaming in about 5 minutes at a high speed, and slurry will produce a large amount of foams, and volume is about 3.1 times of former slurry, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtain base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 91.1%, and density is 0.2438 g/cm
3, thermal conductivity is 0.0518 W/ (mK), ultimate compression strength is 0.52MPa.Fig. 1 is the surface picture figure of finished product, the upper surface photo figure that wherein Fig. 1 (a) is finished product, and the lower surface photo figure that Fig. 1 (b) is finished product, known sample surfaces is regular, forming; Fig. 2 is the micro-structure diagram (scanning electronic microscope) of finished product section, and wherein Fig. 2 (a) is the scanning electron microscope diagram of 50 times, and Fig. 2 (b) is the scanning electron microscope diagram of 200 times.The porous ceramics that can find out preparation has uniform spherical honeycomb porous structure unit, and hole wall is interconnected with hole window.
Embodiment 4
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, glass powder 2wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 62.15wt%.
The concrete operation step of preparing heat insulating porous ceramics is as follows:
By 72.53g water, 57.47g flyash, 0.16gPAAS, 0.25gSHMP, 3.30g glass powder and 72.53g water add ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, under 90 DEG C of conditions of temperature, dissolve and obtain the agar water-sol; Get elementary slurry 95g, elementary slurry is bathed to preheating at 55 DEG C of Water Unders of temperature, add the agar water-sol, under low speed 400 rpm conditions, agitator stirs and makes it fully to mix for about about two minutes, the uniform and stable ceramic size that acquisition solid content is 37wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, under 1800 rpm conditions, agitator stirs fully foaming in about 5 minutes at a high speed, and slurry will produce a large amount of foams, and volume is about 3 times of former slurry, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtain base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 90.35%, and density is 0.2589 g/cm
3, thermal conductivity is 0.0581 W/ (mK), ultimate compression strength is 0.70MPa.
Embodiment 5
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, glass powder 2wt%, whipping agent Sodium dodecylbenzene sulfonate (SDBS) 0.5wt%, water 62.05wt%.
The concrete operation step of preparing heat insulating porous ceramics is as follows:
57.47g flyash, 0.16gPAAS, 0.25gSHMP, 3.30g glass powder and 72.53g water are added to ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, under 90 DEG C of conditions of temperature, dissolve and obtain the agar water-sol; Get elementary slurry 95g, elementary slurry is bathed to preheating at 55 DEG C of Water Unders of temperature, add the agar water-sol, under low speed 400 rpm conditions, agitator stirs and makes it fully to mix for about about two minutes, the uniform and stable ceramic size that acquisition solid content is 37wt%; (3) in ceramic size, add the whipping agent SDBS of ceramic size 0.5wt%, under 1800 rpm conditions, agitator stirs fully foaming in about 5 minutes at a high speed, and slurry will produce a large amount of foams, and volume is about 3 times of former slurry, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in tetrafluoroethylene mould, under room temperature, gel solidification 24 h, obtain base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1000 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 90.14%, and density is 0.2605 g/cm
3, thermal conductivity is 0.0592 W/ (mK), ultimate compression strength is 0.72MPa.
Embodiment 6
Feed composition weight percent is: flyash 35wt%, agar powder 0.2wt%, suds-stabilizing agent Sodium hexametaphosphate 99 (PAAS) 0.15wt%, dispersion agent sodium polyacrylate (SHMP) 0.1wt%, glass powder 2wt%, whipping agent sodium lauryl sulphate (K12) 0.4wt%, water 62.15wt%.
The concrete operation step of preparing heat insulating porous ceramics is as follows:
57.47g flyash, 0.16gPAAS, 0.25gSHMP, 3.30g glass powder and 72.53g water are added to ball mill, and drum's speed of rotation 180 r/min, Ball-milling Time 24 h, obtain elementary slurry; (2) 0.26g agar powder is added in 25g water, under 90 DEG C of conditions of temperature, dissolve and obtain the agar water-sol; Get elementary slurry 95g, elementary slurry is bathed to preheating at 55 DEG C of Water Unders of temperature, add the agar water-sol, under low speed 400 rpm conditions, agitator stirs and makes it fully to mix for about about two minutes, the uniform and stable ceramic size that acquisition solid content is 37wt%; (3) in ceramic size, add the whipping agent K12 of ceramic size 0.4wt%, under 1800 rpm conditions, agitator stirs fully foaming in about 5 minutes at a high speed, and slurry will produce a large amount of foams, and volume is about 3 times of former slurry, obtains foamed slurry.(4) foamed slurry is poured into (mould lower surface and surrounding scribble a small amount of silicone oil) in silica gel mould, under room temperature, gel solidification 24 h, obtain base substrate.(5) after billet surface moisture evaporate to dryness, carry out the demoulding, move back after mould natural air drying 24 h under room temperature again, obtain porous ceramics green compact.(6) with the temperature rise rate of 2 DEG C/min, green compact are heated to 500 DEG C, at 500 DEG C, are incubated 1h, continued to be heated to 1100 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
The porosity of gained porous ceramics is 89.03%, and density is 0.2686 g/cm
3, thermal conductivity is 0.0593 W/ (mK), ultimate compression strength is 0.81MPa.
Claims (7)
1. the preparation method of a light flyash heat insulating porous ceramics, it is characterized in that: comprise raw material powder coal ash 30～40wt%, agar powder 0.1～0.5wt%, suds-stabilizing agent 0.15～0.2wt%, dispersion agent 0.1～0.15wt%, the glass powder 0～4wt% of following mass percent, whipping agent 0.3～0.5wt% and water 54.65～64.75wt%;
Described suds-stabilizing agent is Sodium hexametaphosphate 99, and described dispersion agent is sodium polyacrylate, and described whipping agent is sodium lauryl sulphate or Sodium dodecylbenzene sulfonate;
Preparation manipulation step is: (1), by flyash, glass powder, dispersion agent and suds-stabilizing agent, adds water and stirs rear ball milling, obtains elementary slurry; (2) preparation is containing the stable ceramic size of agar; (3) add tensio-active agent, stir the foamed slurry that foams to obtain; (4) foamed slurry is poured in mould into self-vulcanizing; (5) demoulding is dried to obtain porous ceramics green compact; (6) by porous ceramics green compact sintering in low-temperature sintering stove, obtain porous ceramics;
The porosity of described porous ceramics is 88～91wt%, and density is 0.24～0.31g/cm
3, thermal conductivity is 0.051～0.072 W/ (mK), ultimate compression strength is 0.4～1.0MPa.
2. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1, is characterized in that: concrete operation step is as follows:
(1) prepare elementary slurry, by flyash, glass powder, dispersion agent, suds-stabilizing agent and water, mixing and ball milling, rotational speed of ball-mill 170～180 r/min, Ball-milling Time 20～24 h, obtain elementary slurry;
(2) preparation is containing agar slurry, elementary slurry is bathed to preheating at 55～60 DEG C of Water Unders of temperature, 25.14g～25.62g agar water-sol is joined in 95g slurry, the concentration of the described agar water-sol is 0.56～2.42wt%, be uniformly mixed, obtaining solid content is the uniform and stable ceramic size of 35wt%;
(3) foam, add the tensio-active agent of ceramic size 0.3～0.5wt% in ceramic size, violent stirring produces a large amount of foams, and intensively stirred rotating speed is 1700～2000 r/min, and churning time 4～6 min, obtain foamed slurry;
(4) gel solidification, pours foamed slurry in mould into, and under room temperature, gel solidification 20～24 h, obtain base substrate;
(5) demoulding is dry, treats billet surface moisture evaporate to dryness, the demoulding, and under room temperature, natural air drying 20～24 h, obtain porous ceramics green compact;
(6) sintering, with the temperature rise rate of 2 DEG C/min, porous ceramics green compact are heated to 500 DEG C, insulation 1h, continued to be heated to 900～1100 DEG C with the temperature rise rate of 5 DEG C/min again, insulation 2h, then makes it be cooled to 500 DEG C with the rate of temperature fall of 5 DEG C/min, naturally cool to room temperature, obtain porous ceramics.
3. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1 and 2, is characterized in that: described flyash is crossed 100 mesh sieves, and described glass powder is by scrap glass ball milling 24h, crosses 100 mesh sieves.
4. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1 and 2, is characterized in that: the molecular weight MW of described sodium polyacrylate is 500～8,000,000.
5. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1 and 2, is characterized in that: the described ball milling of step (1), and the ratio of powder and abrading-ball is 1:3～1:4; For ensureing that powder has sufficient mixing space, the add-on of powder should account for 1/3～1/5 of ball grinder capacity simultaneously.
6. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 2, it is characterized in that: 0.14～0.62g agar powder is joined in 20～25g water and dissolved, at 90～95 DEG C of temperature, stirring and dissolving is even, obtains the agar water-sol of 0.56～2.42wt%.
7. the preparation method of a kind of light flyash heat insulating porous ceramics according to claim 1 and 2, is characterized in that: in step (5), the material of mould therefor is silica gel or tetrafluoroethylene.
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| CN104690018B (en) * | 2015-02-16 | 2017-03-29 | 福建省晋江万利瓷业有限公司 | Ceramic production device cleans the recovery system of material |
| CN104690018A (en) * | 2015-02-16 | 2015-06-10 | 福建省晋江万利瓷业有限公司 | Recovery system for ceramic production equipment cleaning materials |
| CN106518095B (en) * | 2016-09-29 | 2019-03-19 | 中国科学院上海硅酸盐研究所 | A kind of method that surfactant hydrophobic modifiers dispersants prepare foamed ceramics |
| CN106518095A (en) * | 2016-09-29 | 2017-03-22 | 中国科学院上海硅酸盐研究所 | Method for preparing foamed ceramics by surfactant hydrophobic modification of dispersant |
| CN107162391A (en) * | 2017-05-12 | 2017-09-15 | 清华大学 | A kind of preparation method that the regulatable foam glass of micron order air hole structure is prepared by raw material of cullet |
| CN107162391B (en) * | 2017-05-12 | 2020-08-21 | 清华大学 | Preparation method for preparing foam glass with adjustable and controllable micron-sized pore structure by taking waste glass as raw material |
| CN108329051A (en) * | 2017-07-04 | 2018-07-27 | 中国科学院金属研究所 | A kind of superelevation porosity and low green body shrinking percentage Y2SiO5The preparation method of porous ceramics |
| CN108329051B (en) * | 2017-07-04 | 2020-09-18 | 中国科学院金属研究所 | Y with ultrahigh porosity and low blank shrinkage2SiO5Preparation method of porous ceramic |
| CN108558366A (en) * | 2018-01-26 | 2018-09-21 | 中北大学 | A kind of preparation method of high-efficiency water-absorbing water conservation pulverized coal-ash-based porous material |
| CN110423099A (en) * | 2019-07-29 | 2019-11-08 | 盐城工学院 | Three-dimensional netted spinelle-porous cordierite ceramics of high porosity and preparation method thereof |
| CN110423099B (en) * | 2019-07-29 | 2021-11-23 | 盐城工学院 | High-porosity three-dimensional network spinel-cordierite porous ceramic and preparation method thereof |
| CN111499404A (en) * | 2020-04-26 | 2020-08-07 | 中国科学院城市环境研究所 | Method and system for preparing perforated bricks by adopting raw sludge |
| CN112110744A (en) * | 2020-09-10 | 2020-12-22 | 中科院过程工程研究所南京绿色制造产业创新研究院 | Magnetic porous ceramic adsorption material and preparation method and application thereof |
| CN115677377A (en) * | 2021-12-22 | 2023-02-03 | 湖南有色冶金劳动保护研究院有限责任公司 | Preparation method of tailing-based porous ceramic material |
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