CN105198308B - A kind of preparation method of light calcium silicate plate - Google Patents
A kind of preparation method of light calcium silicate plate Download PDFInfo
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- CN105198308B CN105198308B CN201410308051.0A CN201410308051A CN105198308B CN 105198308 B CN105198308 B CN 105198308B CN 201410308051 A CN201410308051 A CN 201410308051A CN 105198308 B CN105198308 B CN 105198308B
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Abstract
The invention discloses a kind of preparation method of light calcium silicate plate, comprise the following steps:1) Feedstock treating：Sodium calcium silicate raw material and sig water are mixed to get mixed slurry, and the mixed slurry carries out basic hydrolysis, and after hydrolysis is finished, separation of solid and liquid obtains solid silicic acid calcium slag；The sodium calcium silicate raw material includes the one or more in flyash, red mud, gangue, diatomite and bentonite；2) mixed material is prepared, and is mixed with water；The mixed material includes calcium silicates slag and reinforcing fiber；The reinforcing fiber is paper fiber or cotton fiber；3) reinforcing fiber loosen with mixed material it is well mixed after, carry out separation of solid and liquid and obtain filter cake；4) filter cake is pressed into plate, the article removal after shaping produces wet base.Calcium silicate board prepared by the present invention has density small, and intensity is high, is unlikely to deform, the premium properties of fire-proof and thermal-insulation.The higher value application of the high silicon raw materials such as the achievable flyash of the present invention, it is simple and environmentally-friendly；Technique, economy and facility are steamed without pressure.
Description
Technical field
The present invention relates to a kind of preparation method of calcium silicate board, more particularly to a kind of preparation of the calcium silicate board of lightweight is newly square
Method, belongs to building material field.
Background technology
The development trend of building materials industry is production lightweight, high-strength, energy-conserving and environment-protective construction materials, with building for high-strength light
The deadweight that material reduces building is built, mechanization and the assembling level of construction is improved.Calcium silicate board as novel environment friendly building materials,
With fire prevention, moistureproof, durable, deformation rate it is low, it is heat-insulated the features such as.
At present, traditional calcium silicate board is with siliceous material, calcareous material and adds reinforcing fiber and additive, through overmulling
Close slurrying, into base, autoclave at high temperature conserve etc. process be made, such as patent document CN101279831 disclose a kind of calcium silicates and
Its preparation method, patent document CN1884180 discloses a kind of asbestos-free calcium silicate board and preparation method thereof.
Current industrial calcium silicate board is middle-high density mostly, and its density is in 1.1g/cm3More than, it is close than low
There is larger deficiency in terms of sound insulation, heat-insulation and heat-preservation, construction in the light calcium silicate plate of degree.And existing low-density calcium silicate board
Its density is general in 0.6-0.9g/cm3Between, the SiO in production process in siliceous material2With the CaO in calcareous material through hydro-thermal
Synthetic reaction generates tobermorite crystal, typically will be through secondary steam-cured, and cost of material, energy consumption and manufacturing cost are higher, such
Preparation method can be found in patent document CN103449773A, its disclosed a kind of light calcium silicate plate and preparation method thereof；Patent
Document CN102584116A, it discloses a kind of Asbestos-free light calcium silicate board.
Patent document CN1350993A discloses the manufacture method as a kind of lightweight calcium silicates, and this method can be made density and exist
0.8-1.0g/cm3Calcium silicates version, but it still needs high-temperature steam curing link；Patent document CN103449773 discloses one
The preparation method of the asbestos-free light calcium silicate plate of low-density and high-strength is planted, will be light but still include in the preparation method
Steam-cured process in matter calcium silicate board base substrate feeding still kettle, process is relatively complicated.
The content of the invention
Present invention aims at providing that a kind of density is low, intensity is high, be unlikely to deform, the calcium silicate board of heat-insulating, fire-preventing and its system
Preparation Method.
Primary raw material used in the inventive method includes sodium calcium silicate, and the calcium silicates sodium is by flyash, red mud, coal
The raw material of the high silicon dioxide contents such as spoil, diatomite, bentonite is obtained through chemical conversion, and this sodium calcium silicate is through hydrothermal decomposition
Reaction obtains a kind of calcium silicates slag, such a microcosmic crystal structure of calcium silicates and morphology controllable, with cement, flyash, gypsum, stone
English, reinforcing fiber etc. mix, suppress and calcium silicate board is made according to a certain ratio, and compacting link therein is without steam pressure step.
The preparation method for the calcium silicate board that the present invention is provided, comprises the following steps:
Step 1)：Feedstock treating：Sodium calcium silicate raw material and sig water in mass ratio 1:10-1:30 are mixed to get compound
Slurry, the mixed slurry carries out basic hydrolysis, and after hydrolysis is finished, separation of solid and liquid obtains solid silicic acid calcium slag；The silicic acid
Sodium calcium raw material includes the one or more in flyash, red mud, gangue, diatomite and bentonite.
It is preferred that, NaOH concentration is 1-50g/L in the sig water.
It is preferred that, the mixed slurry is hydrolyzed for 70-250 DEG C in temperature, and hydrolysis time can select 4-40h.Reaction
During slurry is stirred, to after reaction slurry carry out filtration washing, obtain calcium silicates slag.
Step 2)：Mixed material is prepared, and is mixed with water；The mixed material includes calcium silicates slag and enhancing is fine
Dimension；The mass fraction of the calcium silicates slag is 50-90wt%, and the reinforcing fiber is paper fiber or cotton fiber.
It is preferred that, the mixed material also includes cement 0-20wt%；Flyash 0-20wt%；Gypsum 0-20wt%；Stone
English 0-20wt% and bentonite 0-3wt%.
It is preferred that, when the reinforcing fiber is paper fiber, the content of paper fiber is 3-20wt%；The reinforcing fiber is cotton
During fiber, the content of the cotton fiber is 3-15wt%.
Step 3)：The reinforcing fiber loosen with mixed material it is well mixed after, carry out separation of solid and liquid and obtain filter cake.
It is preferred that, mixture temperature is 20-90 DEG C, fiber to be reinforced fully loosen and material it is well mixed after, to slurry
Carry out solid-liquor separation.
Step 4)：Filter cake is pressed into plate, the article removal after shaping produces wet base.
It is preferred that, pressure is 20-60MPa during compacting, and pressure is held time 5-120min.
It is furthermore preferred that methods described also includes：
Step 5)：The wet base of gained is rested 1-48h, is then dried at 70-130 DEG C to moisture content and is less than 10wt%,
Calcium silicate board finished product is made.
Present invention also offers the calcium silicate board prepared using the above method.
The calcium silicate board that the present invention is provided has following obvious beneficial effect：
1) primary raw material of the present invention is different from traditional calcium silicate board raw materials for production, is with flyash, red mud, coal
The high silicon raw material such as spoil is raw material through the sodium calcium silicate obtained by chemical conversion.Sodium calcium silicate obtains a kind of calcium silicates through hydrothermal decomposition
Slag, to prepare calcium silicate board.With traditional calcareous material compared with siliceous material synthetic reaction, raw material is simple, energy saving economy.
2) present invention reduces the autoclave at high temperature maintaining process of traditional mode of production calcium silicate board during calcium silicate board is prepared,
Shorten Making programme.Further, since raw material sources are extensively, operation is easy, economic and environment-friendly.
3) the calcium silicate article microscopic appearance used in the present invention is controllable, can be the bar-shaped or spherical knot of flakey overlap joint
Structure or threadiness winding spherical structure, under a certain pressure the calcium silicate crystals of different structure with quartz, flyash
Deng aggregate cross-lapping, and form in the presence of reinforcing fiber closely knit base substrate.
4) calcium silicate board provided by the present invention be that a kind of density is low, intensity is high, be unlikely to deform, the high-quality plate of heat-insulating, fire-preventing
Material.Calcium silicate board density is in 0.6-1.0g/cm3Scope, rupture strength is in more than 8MPa.
The present invention is, using sodium calcium silicate as raw material, calcium silicates, this calcium silicates and cement, fine coal to be obtained through hydrothermal decomposition
Ash, reinforcing fiber etc. are mixed, suppressed according to a certain ratio, prepare calcium silicate board.The present invention makes full use of valuable group of above-mentioned raw materials
Point, the higher value application of the high silicon raw materials such as flyash can be achieved.
Brief description of the drawings
Fig. 1, the present invention process chart.
Embodiment
Embodiment 1
Referring to Fig. 1, flyash obtains the solid slag using sodium calcium silicate as main component after chemical conversion, its main component
For 18.62% Na2O, 31.24% SiO2With 33.56% CaO.The solid slag is pressed with NaOH concentration for 1g/L sig water
1：30 mass ratioes are mixed, and Dynamic Hydrothermal decomposition reaction, 250 DEG C of reaction temperature, reaction time 4h are then carried out in a kettle..Instead
Slurry after answering carries out filtration washing, produces a kind of calcium silicates slag.Prepare each component formula (mass ratio) of calcium silicate board：It is made
Calcium silicates slag dry weight 70wt%, cement 20wt%, paper fiber 10wt%.Accurately weigh to add water to mix at 90 DEG C after each material and stir
Mix, treat fiber reinforced cement composite, batch mixing is uniform, after to slurry solid-liquor separation, filter cake is carried out being pressed into plate with the mould specified.Briquetting pressure
60MPa, briquetting pressure is held time 5min.It is stripped after shaping, wet base is rested 48h, then in 70 DEG C of dry 24h.Finally it is made
Calcium silicate board finished product density be 0.86g/cm3, rupture strength is 8.36MPa.
Embodiment 2
It is solid slag of the raw material through chemical conversion preparation using sodium calcium silicate as main component using red mud, its main component is
14.58% Na2O, 29.74% SiO2With 31.05% CaO.The solid slag is pressed with NaOH concentration for 10g/L sig water
1：15 mass ratioes are mixed, and Dynamic Hydrothermal decomposition reaction, 160 DEG C of reaction temperature, reaction time 6h are then carried out in a kettle..Instead
Slurry after answering carries out filtration washing, produces a kind of calcium silicates slag.Prepare each component formula (mass ratio) of calcium silicate board：It is made
Calcium silicates slag dry weight 50wt%, flyash 20wt%, gypsum 20wt%, cotton fiber 7wt%, bentonite 3wt%.It is accurate to weigh respectively
Add water and mixed at 70 DEG C after material, treat fiber reinforced cement composite, batch mixing is uniform, after to slurry solid-liquor separation, filter cake is with specifying
Mould carries out being pressed into plate.Briquetting pressure 20MPa, briquetting pressure is held time 120min.It is stripped after shaping, wet base is rested 24h,
Then in 130 DEG C of dry 8h.Last obtained calcium silicate board finished product unit weight is 0.95g/cm3, and rupture strength is 8.75MPa.
Embodiment 3
It is solid slag of the raw material through chemical conversion preparation using sodium calcium silicate as main component using bentonite, its main component is
17.39% Na2O, 32.63% SiO2With 34.19% CaO.The solid slag is pressed with NaOH concentration for 50g/L sig water
1：10 mass ratioes are mixed, and Dynamic Hydrothermal decomposition reaction, 70 DEG C of reaction temperature, reaction time 40h are then carried out in a kettle..Instead
Slurry after answering carries out filtration washing, produces a kind of calcium silicates slag.Prepare each component formula (mass ratio) of calcium silicate board：It is made
Calcium silicates slag dry weight 90wt%, cement 4wt%, paper fiber 3wt%, cotton fiber 3wt%.Added water after accurately weighing each material 20
Mixed at DEG C, treat fiber reinforced cement composite, batch mixing is uniform, after slurry solid-liquor separation, filter cake are pressed into the mould specified
Plate.Briquetting pressure 25MPa, briquetting pressure is held time 80min.It is stripped after shaping, wet base is rested 10h, then in 100 DEG C of dryings
18h.Last obtained calcium silicate board finished product density is 0.79g/cm3, and rupture strength is 8.42MPa.
Embodiment 4
It is solid slag of the raw material through chemical conversion preparation using sodium calcium silicate as main component using diatomite, its main component is
20.15% Na2O, 33.16% SiO2With 34.03% CaO.The solid slag is pressed with NaOH concentration for 20g/L sig water
1：20 mass ratioes are mixed, and Dynamic Hydrothermal decomposition reaction, 120 DEG C of reaction temperature, reaction time 15h are then carried out in a kettle..
Reacted slurry carries out filtration washing, produces a kind of calcium silicates slag.Prepare each component formula (mass ratio) of calcium silicate board：Institute
Calcium silicates slag dry weight 60wt% processed, cement 10wt%, quartzy 10wt%, paper fiber 20wt%.Added water after accurately weighing each material
Mixed at 60 DEG C, treat fiber reinforced cement composite, batch mixing is uniform, after slurry solid-liquor separation, filter cake are pressed with the mould specified
Manufactured Board.Briquetting pressure 30MPa, briquetting pressure is held time 40min.It is stripped after shaping, wet base is rested 20h, then at 110 DEG C
Dry 15h.Last obtained calcium silicate board finished product density is 0.82g/cm3, and rupture strength is 9.74MPa.
Embodiment 5
It is that raw material obtains solid slag using sodium calcium silicate as main component, its main component after chemical conversion using silica flour
For 19.73% Na2O, 31.06% SiO2With 33.54% CaO.The solid slag and the sig water that NaOH concentration is 30g/L
By 1：15 mass ratioes are mixed, and Dynamic Hydrothermal decomposition reaction, 100 DEG C of reaction temperature, reaction time are then carried out in a kettle.
20h.Reacted slurry carries out filtration washing, produces a kind of calcium silicates slag.Prepare each component formula (quality of calcium silicate board
Than)：Made calcium silicates slag dry weight 66wt%, gypsum 9wt%, quartzy 9wt%, cotton fiber 15wt%, bentonite 1wt%.Accurately
Weigh to add water after each material and mixed at 80 DEG C, treat fiber reinforced cement composite, batch mixing is uniform, after slurry solid-liquor separation, filter cake are used
The mould specified carries out being pressed into plate.Briquetting pressure 35MPa, briquetting pressure is held time 30min.It is stripped after shaping, wet base is quiet
1h is supported, then in 80 DEG C of dry 20h.Last obtained calcium silicate board finished product density is 0.84g/cm3, and rupture strength is
9.44MPa。
Claims (6)
1. a kind of preparation method of light calcium silicate plate, comprises the following steps:
1) Feedstock treating：Sodium calcium silicate raw material and sig water in mass ratio 1:10-1:30 are mixed to get mixed slurry, the mixing
Slurry carries out basic hydrolysis, and after hydrolysis is finished, separation of solid and liquid obtains solid silicic acid calcium slag；The sodium calcium silicate raw material includes
One or more in flyash, red mud, gangue, diatomite and bentonite；
2) mixed material is prepared, and is mixed with water；The mixed material includes calcium silicates slag and reinforcing fiber；The silicic acid
The mass fraction of calcium slag is 50-90wt%, and the reinforcing fiber is paper fiber or cotton fiber；The mixed material also includes cement
0-20wt%；Flyash 0-20wt%；Gypsum 0-20wt%；Quartzy 0-20wt% and bentonite 0-3wt%；
3) after the reinforcing fiber is loosened and mixed material is well mixed, carry out separation of solid and liquid and obtain filter cake；
4) filter cake is pressed into plate, the article removal after shaping produces wet base.
2. according to the method described in claim 1, it is characterised in that NaOH concentration is 1-50g/L in the sig water.
3. method according to claim 1 or 2, it is characterised in that the mixed slurry enters water-filling for 70-250 DEG C in temperature
Solution, hydrolysis time is 4-40h.
4. method according to claim 1 or 2, it is characterised in that when the reinforcing fiber is paper fiber, paper fiber contains
Measure as 3-20wt%；When the reinforcing fiber is cotton fiber, the content of the cotton fiber is 3-15wt%.
5. method according to claim 1 or 2, it is characterised in that mixture temperature is 20-90 DEG C.
6. method according to claim 1 or 2, it is characterised in that step 4) compacting when pressure be 20-60MPa, pressure dimension
Hold time 5-120min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107572951B (en) * | 2017-08-30 | 2020-01-03 | 济南大学 | High-density calcium silicate board and preparation method thereof |
| CN109571715B (en) * | 2018-10-12 | 2021-04-02 | 佛山市高明区安承升降装备研究院 | Elevator and preparation method thereof |
| CN113620659A (en) * | 2020-05-08 | 2021-11-09 | 中联环股份有限公司 | Method for preparing non-autoclaved hydrophobic fiber reinforced calcium silicate board by utilizing fly ash |
| CN113247914A (en) * | 2021-04-12 | 2021-08-13 | 南昌大学 | Method for preparing goethite by using fly ash aluminum extraction slag and application |
| CN113372050B (en) * | 2021-07-30 | 2022-04-26 | 浙江碧蓝云鼎控股有限公司 | High-strength calcium silicate board and preparation method thereof |
| CN117263634B (en) * | 2023-10-14 | 2024-06-21 | 河北中科新航建材有限公司 | Preparation method of calcium silicate board and calcium silicate board |
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| CN101219879A (en) * | 2008-01-23 | 2008-07-16 | 山东大学 | Carbon fiber reinforcing calcium silicate heat-preserving heat insulation material and method for producing the same |
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2014
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| CN101219879A (en) * | 2008-01-23 | 2008-07-16 | 山东大学 | Carbon fiber reinforcing calcium silicate heat-preserving heat insulation material and method for producing the same |
| CN103373738A (en) * | 2012-04-19 | 2013-10-30 | 中国科学院过程工程研究所 | Fly ash low-temperature wet activating treatment method |
| CN103539139A (en) * | 2013-11-11 | 2014-01-29 | 内蒙古大唐国际再生资源开发有限公司 | Method for preparing xonotlite by utilizing desiliconized alkali liquor |
Non-Patent Citations (1)
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