CN114057457A - Process for preparing calcium silicate board by using residue of aluminum extraction from fly ash - Google Patents
Process for preparing calcium silicate board by using residue of aluminum extraction from fly ash Download PDFInfo
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- CN114057457A CN114057457A CN202111398186.7A CN202111398186A CN114057457A CN 114057457 A CN114057457 A CN 114057457A CN 202111398186 A CN202111398186 A CN 202111398186A CN 114057457 A CN114057457 A CN 114057457A
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- calcium silicate
- silicate board
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- 239000000378 calcium silicate Substances 0.000 title claims abstract description 60
- 229910052918 calcium silicate Inorganic materials 0.000 title claims abstract description 60
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000010881 fly ash Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 21
- 238000000605 extraction Methods 0.000 title claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000002699 waste material Substances 0.000 claims abstract description 29
- 239000006004 Quartz sand Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 12
- 238000000746 purification Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 29
- 238000001035 drying Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000010425 asbestos Substances 0.000 claims description 10
- 229910052895 riebeckite Inorganic materials 0.000 claims description 10
- 229920002522 Wood fibre Polymers 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 239000002025 wood fiber Substances 0.000 claims description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 7
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000004537 pulping Methods 0.000 claims description 7
- 238000001238 wet grinding Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 4
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000011863 silicon-based powder Substances 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000003993 interaction Effects 0.000 abstract description 3
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 238000009413 insulation Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000035939 shock Effects 0.000 abstract 1
- 238000007688 edging Methods 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- UGGQKDBXXFIWJD-UHFFFAOYSA-N calcium;dihydroxy(oxo)silane;hydrate Chemical compound O.[Ca].O[Si](O)=O UGGQKDBXXFIWJD-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- MKTRXTLKNXLULX-UHFFFAOYSA-P pentacalcium;dioxido(oxo)silane;hydron;tetrahydrate Chemical compound [H+].[H+].O.O.O.O.[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O MKTRXTLKNXLULX-UHFFFAOYSA-P 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/52—Sound-insulating materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a process for preparing a calcium silicate board by using fly ash aluminum extraction residues. This technology of aluminium residue preparation calcium silicate board is carried to fly ash, can further guarantee the purity and the performance of whole calcium silicate board through the scheme to quartz sand purification process, make the effect of interaction between its different materials compacter, processing scheme through adopting specific temperature and pressure more helps agreeing with and promoting between the different materials, carry out recycle's scheme to the waste material, continue its form through with board powder or board granule and prepare new calcium silicate board, show the support that has reduced the enterprise and the production of waste material, promote the comprehensive properties of calcium silicate board simultaneously, satisfy the user demand in market, improve calcium silicate board's fire prevention, give sound insulation, thermal-insulated and shock resistance.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a process for preparing a calcium silicate board by using fly ash aluminum extraction residues.
Background
The calcium silicate board is used as a novel green environment-friendly building material, has the advantages of excellent fireproof performance, moisture resistance and super-long service life besides the functions of the traditional gypsum board, and is widely applied to suspended ceilings and partition walls of industrial and commercial engineering buildings, home decoration, lining boards of furniture, lining boards of billboards, shed boards of warehouses, network floors, tunnel and other indoor engineering wall boards;
along with the improvement of life quality of people, the requirements on building materials of houses and buildings are higher and higher, and calcium silicate boards have a wider development prospect as new materials in the current life process, but the problems that the calcium silicate boards produced by some current manufacturers have poorer comprehensive performance and generate certain waste materials in the manufacturing process, so that energy is wasted and the supporting cost of enterprises is increased are solved.
Disclosure of Invention
The invention aims to provide a process for preparing a calcium silicate board by using fly ash aluminum extraction residues, which at least solves the problems that the calcium silicate board provided by the prior art is poor in comprehensive performance and generates certain waste materials in the manufacturing process, so that energy waste is caused, and the supporting cost of enterprises is increased.
In order to achieve the purpose, the invention provides the following technical scheme: a process for preparing a calcium silicate board from fly ash aluminum extraction residues comprises the following steps:
step one, quartz sand purification process: grinding and cleaning quartz sand prepared in advance to remove part of impurities, then carrying out wet grinding pulping on the quartz sand, and mixing silicon micro powder in the middle to obtain a mixture A;
step two, wood fiber preparation: diluting and defibering the deionized water and the wood fiber by a counter-flow stirrer to obtain a slurry mixture B, and sending the slurry mixture B into a slurry storage machine for later use;
step three, a primary mixing procedure: pre-mixing the mixture A and the mixture B obtained in the first step and the second step;
step four, a remixing procedure: adding fly ash, cement and slaked lime into the mixture prepared in the third step to obtain a mixture C;
step five, a waste recycling process: carrying out multi-section crushing processing on leftover materials and waste materials produced by the silicic acid cover plate to prepare recyclable plate powder or plate particles;
step six, completing the preparation of the calcium silicate board: and (3) forming the mixture C into a slab, compacting and drying, paving the asbestos and the slurry-like mixture C on the surface of the mixture C in the intermediate stage of the drying of the mixture C for making the slab, and continuing to compact and dry.
Preferably, the iron material is adsorbed by magnetic force during the polishing and cleaning processes of the quartz sand.
Preferably, the ratio of the quartz sand to the silicon micropowder is 3: 1.2.
Preferably, the silicon powder particles obtained after the wet grinding and pulping are smaller than the particle size of the silicon micropowder.
Preferably, the process for preparing the calcium silicate board by using the fly ash aluminum extraction residue further comprises the following steps: steam curing: and (4) transferring the plate into an autoclave for autoclaving after demoulding.
Preferably, before the autoclave curing process, the autoclave needs to be vacuumized to-0.4 to-0.5 MPa.
Preferably, the mixing temperature in the third step is 80 to 90 ℃.
Preferably, the temperature of the autoclave in the autoclave curing process is 180-.
The process for preparing the calcium silicate board by using the fly ash aluminum extraction residues has the beneficial effects that:
1. according to the invention, the purity and performance of the whole calcium silicate plate can be further ensured through the scheme of the quartz sand purification process, and the condition that the calcium silicate plate is unstable in property or cracks caused by impurities is prevented, wherein the micro silicon powder and the quartz sand with different particle sizes are used as base materials, so that the strength of the device can be increased, and the interaction effect between different materials is more compact.
2. The scheme of adding various mixtures, fly ash, cement and slaked lime in steps of the invention makes the whole process flow of the device more clear and definite, wherein the matching and promotion among different materials are more facilitated by adopting the processing scheme of specific temperature and pressure.
3. The method has the advantages that a large amount of waste materials exist in the application of the calcium silicate board or the calcium silicate board at present, part of the waste materials can be generated in the production stage of a factory, the production finished products of enterprises can be improved by discarding the finished product leftover materials or the waste materials, and meanwhile, the treatment process and equipment of the corresponding waste materials need to be equipped.
Drawings
FIG. 1 is a process flow chart of preparing calcium silicate board from residue of aluminum extraction from fly ash.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present invention provides a technical solution: in order to achieve the purpose, the invention provides the following technical scheme: a process for preparing a calcium silicate board from fly ash aluminum extraction residues comprises the following steps:
s1, quartz sand purification process: grinding and cleaning quartz sand prepared in advance to remove part of impurities, then carrying out wet grinding pulping on the quartz sand, and mixing silicon micro powder in the middle to obtain a mixture A;
s2, preparation of wood fibers: diluting and defibering the deionized water and the wood fiber by a counter-flow stirrer to obtain a slurry mixture B, and sending the slurry mixture B into a slurry storage machine for later use;
s3, primary mixing: pre-mixing the mixture A and the mixture B obtained in the step S1 and the step S2;
s4, remixing step: adding fly ash, cement and slaked lime to the mixture prepared in step S3 to obtain a mixture C;
s5, a waste recycling process: carrying out multi-section crushing processing on leftover materials and waste materials produced by the silicic acid cover plate to prepare recyclable plate powder or plate particles;
s6, completing the preparation of the calcium silicate board: and (3) forming the mixture C into a slab, compacting and drying, paving the asbestos and the slurry-like mixture C on the surface of the mixture C in the intermediate stage of the drying of the mixture C for making the slab, and continuing to compact and dry.
In the embodiment, the purity and performance of the whole calcium silicate board can be further ensured by the scheme of the quartz sand purification process, the condition that the calcium silicate board is unstable in property or cracks caused by impurities is prevented, wherein silica fume and quartz sand with different particle sizes are used as base materials, the strength of the device can be increased, the interaction effect between different materials is more compact, in addition, the stability of the produced product and the effects of construction convenience, strength increase, surface adhesive force enhancement and the like can be improved based on paper pulp added in the preparation of wood fibers, the product cracking is further prevented, meanwhile, certain water retention performance is realized, the product prepared by the process has certain water absorption, when the use environment is wet, the product can properly absorb the water in the environment, when the environment is dry, the device has the advantages that the device can release stored water to the ambient air, the effect of improving the water in the environment is achieved, the scheme of adding the mixture A, the mixture B, the fly ash, the cement and the slaked lime in steps is adopted, the whole process flow of the device is clearer and more definite, and the processing scheme at 80-90 ℃ is more favorable for the mixture C.
It can be understood that, today, there are a lot of waste materials in the application of calcium silicate boards or calcium silicate boards, some of which may be generated in the production stage of the factory, and the rejection of the finished leftover materials or waste materials will improve the finished products of the enterprise, and at the same time, it is necessary to equip the treatment process and equipment of the corresponding waste materials, this scheme adopts the scheme of recycling the waste materials, and prepares new calcium silicate boards by continuing to prepare the calcium silicate boards in the form of board powder or board particles, specifically, the outer sides of the calcium silicate boards prepared by drying the steps S1 to S4 in this scheme through the mixing form of the calcium silicate boards and the mixture C, knot and asbestos molding, and the material is attached to the specific time of the calcium silicate boards prepared by drying the steps S1 to S4 in this scheme, and can be flexibly adjusted according to the actual processing state and the thickness of the asbestos and the water content in the waste materials, and (3) performing secondary forming and drying on the waste material, the asbestos and the mixture C to obtain the base material of the calcium silicate board, sanding and edging the board surface to ensure that the board surface is flat, enhancing the appearance quality, fixing the thickness of the dried board blank by a single-sided or double-sided sanding machine, and performing edge grinding and chamfering treatment on the sanded board by an edging and chamfering machine.
Example two
Referring to fig. 1, the present invention provides a technical solution: in order to achieve the purpose, the invention provides the following technical scheme:
s1, quartz sand purification process: grinding and cleaning quartz sand prepared in advance to remove part of impurities, then carrying out wet grinding pulping on the quartz sand, and mixing silicon micro powder in the middle to obtain a mixture A;
s2, preparation of wood fibers: diluting and defibering the deionized water and the wood fiber by a counter-flow stirrer to obtain a slurry mixture B, and sending the slurry mixture B into a slurry storage machine for later use;
s3, primary mixing: pre-mixing the mixture A and the mixture B obtained in the step S1 and the step S2;
s4, remixing step: adding fly ash, cement and slaked lime to the mixture prepared in the step S3 to obtain a mixture C;
s5, a waste recycling process: carrying out multi-section crushing processing on leftover materials and waste materials produced by the silicic acid cover plate to prepare recyclable plate powder or plate particles;
s6, completing the preparation of the calcium silicate board: mixing the board powder or board particles with asbestos to form a board blank, compacting and drying, attaching the mixture C to the surface of the board blank in the middle stage of compacting and drying of the board blank, and continuing compacting and drying.
In this embodiment, it can be understood that, also for asbestos currently having a large amount of waste in the application of calcium silicate boards or calcium silicate boards, the scheme adopts a scheme of recycling the waste, and is different from the first embodiment in that the calcium silicate board obtained through the preparation process flow of the second embodiment performs a drying treatment on the waste in advance, and continuously prepares the waste in the form of board powder or board particles to obtain a new calcium silicate board, and the new calcium silicate board is positioned in the middle of the new calcium silicate board, performs a drying treatment in advance, and then attaches the material of the mixture C to the outer side of the currently obtained basic calcium silicate board, and adopts a secondary drying manner, wherein the secondary drying manner can ensure the preparation effect of the whole calcium silicate board, and the specific time for attaching the mixture C in the scheme can be flexibly adjusted according to the actual processing state, the thickness of the asbestos, and the water content in the waste, and (3) performing secondary forming and drying on the waste material, the asbestos and the mixture C to obtain the base material of the calcium silicate board, sanding and edging the board surface to ensure that the board surface is flat, enhancing the appearance quality, fixing the thickness of the dried board blank by a single-sided or double-sided sanding machine, and performing edge grinding and chamfering treatment on the sanded board by an edging and chamfering machine.
EXAMPLE III
Referring to fig. 1, the present invention provides a technical solution: in order to achieve the purpose, the invention provides the following technical scheme: a process for preparing a calcium silicate board from fly ash aluminum extraction residues comprises the following steps:
preferably, the iron material is simultaneously adsorbed by magnetic force during the polishing and cleaning processes of the quartz sand.
Preferably, the ratio of the quartz sand to the fine silica powder is 3: 1.2.
Preferably, the silicon powder particles obtained after wet grinding and pulping are smaller than the particle size of the silicon micropowder.
As a preferable scheme, the process for preparing the calcium silicate board by using the fly ash aluminum extraction residue further comprises the following steps: steam curing: and (4) transferring the plate into an autoclave for autoclaving after demoulding.
Preferably, the autoclave is evacuated to a pressure of-0.4 to-0.5 MPa before the autoclave curing step.
Preferably, the mixing temperature in the third step is 80 to 90 ℃.
Preferably, the temperature of the autoclave in the autoclave curing step is 180-.
In some examples, it should be noted that the impurity content in the raw materials in the scheme can be significantly reduced by adopting a magnetic impurity removal scheme, the impurity removal period is shortened, the ratio of quartz sand to silica powder is 3:1.2, the fitting effect in various different materials can be met, the improvement of the strength of the whole plate is prompted, the high strength performance of the device is further improved through an autoclave curing process, specifically, the autoclave curing time of the plate in an autoclave is 13-16 hours, preferably, the initial temperature is increased for 2 hours, the middle constant temperature is kept for 8-10 hours, the temperature is reduced for 3-4 hours at the later stage, the silica, the calcium hydroxide and the water in the plate blank are subjected to chemical reaction in the autoclave curing process to generate tobermorite crystals and xonotlite, the quality of the plate after hydration reaction directly influences the strength, the expansion rate and the moisture resistance of the calcium silicate plate, wherein the autoclave is generally required to be vacuumized before autoclave, pumping to-0.48 atmospheric pressure, in addition, before the autoclaved curing process, vacuumizing the autoclave to-0.4 to-0.5 MPa, which is more favorable for saving steam and ensuring uniform heat absorption of the calcium silicate board and avoiding the defects of autoclaved curing, wherein the board blank after the autoclaved curing process can be continuously dried in a tunnel kiln, hot air is circulated in the kiln through an axial flow fan, the board blank is uniformly dried, and finally the finished product calcium silicate board is obtained.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A process for preparing a calcium silicate board from fly ash aluminum extraction residues is characterized by comprising the following steps:
step one, quartz sand purification process: grinding and cleaning quartz sand prepared in advance to remove part of impurities, then carrying out wet grinding pulping on the quartz sand, and mixing silicon micro powder in the middle to obtain a mixture A;
step two, wood fiber preparation: diluting and defibering the deionized water and the wood fiber by a counter-flow stirrer to obtain a slurry mixture B, and sending the slurry mixture B into a slurry storage machine for later use;
step three, a primary mixing procedure: pre-mixing the mixture A and the mixture B obtained in the first step and the second step;
step four, a remixing procedure: adding fly ash, cement and slaked lime into the mixture prepared in the third step to obtain a mixture C;
step five, a waste recycling process: carrying out multi-section crushing processing on leftover materials and waste materials produced by the silicic acid cover plate to prepare recyclable plate powder or plate particles;
step six, completing the preparation of the calcium silicate board: and (3) forming the mixture C into a slab, compacting and drying, paving the asbestos and the slurry-like mixture C on the surface of the mixture C in the intermediate stage of the drying of the mixture C for making the slab, and continuing to compact and dry.
2. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 1, wherein the process comprises the following steps: the quartz sand is polished and is adsorbed to the iron material through magnetic force in the cleaning process.
3. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 1, wherein the process comprises the following steps: the ratio of the quartz sand to the silicon micro powder is 3: 1.2.
4. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 1, wherein the process comprises the following steps: and the silicon powder particles obtained after wet grinding and pulping are smaller than the particle size of the silicon micropowder.
5. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 1, wherein the process comprises the following steps: the process for preparing the calcium silicate board by using the fly ash aluminum extraction residue further comprises the following steps:
steam curing: and (4) transferring the plate into an autoclave for autoclaving after demoulding.
6. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 5, wherein the process comprises the following steps: before the autoclaved curing process, the autoclave needs to be vacuumized to-0.4 to-0.5 MPa.
7. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 1, wherein the process comprises the following steps: and the mixing temperature of the step three is 80-90 ℃.
8. The process for preparing the calcium silicate board from the fly ash aluminum extraction residue as claimed in claim 5, wherein the process comprises the following steps: the temperature of the autoclave in the autoclave curing process is 180 ℃ and 190 ℃, and the constant air pressure is 1.25 MPa.
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