CN114276112A - Preparation method of autoclaved aerated concrete block - Google Patents
Preparation method of autoclaved aerated concrete block Download PDFInfo
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- CN114276112A CN114276112A CN202210079838.9A CN202210079838A CN114276112A CN 114276112 A CN114276112 A CN 114276112A CN 202210079838 A CN202210079838 A CN 202210079838A CN 114276112 A CN114276112 A CN 114276112A
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- 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
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Abstract
The invention relates to the field of autoclaved aerated concrete blocks, in particular to a preparation method of an autoclaved aerated concrete block. The method comprises the following steps: according to the quartz tailings: fly ash: gypsum: quick lime: weighing raw materials according to the mass ratio of (35-55) to (15-35) to (3-6) to (14-17) to 10; adding water according to the water-material ratio (0.44-0.52) and stirring; adding a certain amount of aluminum powder paste and an additive; and pouring the mixed slurry into a mold, and performing autoclaved curing. The cement is neutral sodium salt alkali slag cement, and the additive is silicone oil. The improved building block preparation method replaces part of fly ash with quartz tailings raw materials, solves the problem that the quartz tailings waste is difficult to treat at present, and reduces the raw material cost of the building block; the neutral sodium salt alkali slag cement is used for replacing Portland cement in the prior art, so that the discharge amount of carbon dioxide is reduced, and the environment protection is facilitated.
Description
Technical Field
The invention relates to the field of autoclaved aerated concrete blocks, in particular to a preparation method of an autoclaved aerated concrete block.
Background
The steam pressure aerated concrete is a novel porous light energy-saving building material and has the characteristics of environmental protection, earthquake resistance, heat preservation, sound insulation and the like. The new wall material has important role of autoclaved aerated concrete, the main raw materials of the new wall material are gypsum, cement, fly ash and the like, the dry density of the product is about one fifth to one third of the mass of concrete and clay brick, and the dry density of the product is lower than that of most materials such as light aggregate concrete and the like. Therefore, the building wall body adopts the autoclaved aerated concrete, so that the dead weight of a building can be effectively reduced, and the sizes of structures such as beams and columns of the building are reduced, thereby realizing the effective saving of building cost and materials.
In the prior art, fly ash is mostly adopted to provide silicon dioxide for aerated concrete, and the cost of raw materials is high. In the process of mining and processing quartz ores, a large amount of quartz tailings can be generated in China every year, the quartz tailings cannot be effectively treated, a large amount of land resources are occupied, a large amount of silicon dioxide resources are wasted, and the environment is greatly polluted. The content of silicon dioxide in the quartz tailings is high, so that the cost of raw materials can be greatly reduced if the quartz tailings can be applied to the production of aerated concrete blocks. In addition, the production of portland cement requires the consumption of large amounts of fuel and the amplification of carbon dioxide, with 5% to 8% of the annual carbon emissions worldwide contributing to the process of producing cement. Therefore, finding a method for reducing the consumption of cement in the autoclaved aerated concrete block is particularly important for protecting the environment, saving energy and reducing emission.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a preparation method of an autoclaved aerated concrete block, the improved preparation method of the block replaces part of fly ash with quartz tailings, solves the problem that the quartz tailings are difficult to treat at present, and reduces the raw material cost of the block; the neutral sodium salt alkali slag cement is used for replacing Portland cement in the prior art, so that the discharge amount of carbon dioxide is reduced, and the environment protection is facilitated.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of an autoclaved aerated concrete block comprises the following steps:
step S1, according to quartz tailings: fly ash: gypsum: quick lime: weighing raw materials according to the mass ratio of (35-55) to (15-35) to (3-6) to (14-17) to 10 of cement, and uniformly stirring the raw materials in a stirrer to obtain a mixed material; wherein the mass sum of the quartz tailings and the fly ash accounts for 70 percent of the total mass of the raw materials, and the mass sum of the gypsum and the quicklime accounts for 20 percent of the total mass of the raw materials;
step S2, adding water into the mixed material obtained in the step S1 according to the water-material ratio (0.44-0.52), and uniformly stirring to obtain mixed slurry;
s3, adding a certain amount of aluminum paste and additives into the mixture obtained in the step S2, and continuously stirring to obtain mixed slurry;
and S4, pouring the mixture slurry obtained in the step S3 into a mold, standing and maintaining for 4 hours in an environment at 50 ℃, removing the mold, and then putting the mold into an autoclave for autoclave curing to obtain the finished autoclaved aerated concrete block.
Further, the content of silicon dioxide in the quartz tailings in the step S1 is not less than 95% (mass percent), and the water content is not more than 6% (mass percent); the content of the calcium sulfate dihydrate in the gypsum is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.9 percent; after calcined, the calcium oxide content of the quicklime powder is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.5 percent.
Further, the cement in the step S1 is neutral sodium salt alkali slag cement.
Further, the mass of the aluminum powder paste in the step S3 is 0.05-0.1% of the total mass of the mixed material in the step S1, the content of active aluminum in the aluminum powder paste is not less than 90%, and the residue of 200-mesh sieve is 3%. .
Further, the additive in the step S3 is silicone oil, and the mass of the silicone oil is 0.02-0.03% of the total mass of the mixed materials in the step S1.
Further, in step S4, the autoclave is maintained by vacuumizing for 0.5h, heating and pressurizing for 1h, maintaining the temperature and pressure for 6h, and reducing the pressure for 2h, wherein the temperature is controlled to be 190-200 ℃ and the pressure is 1.2 MPa.
Compared with the prior art, the invention has the beneficial effects that:
(1) the content of silicon dioxide in the quartz tailings is high, and the quartz tailings are used for replacing a part of fly ash, so that the problem that the quartz tailings waste is difficult to treat at present is solved, and the raw material cost of the building block is reduced; in the raw material ratio, the weight increase of the fly ash can reduce the volume weight of the autoclaved aerated concrete block, so that the autoclaved aerated concrete blocks with different volume weights can be obtained by adjusting the mass ratio of the quartz tailings and the fly ash, and the product types are richer.
(2) The neutral sodium salt alkali slag cement is alkali slag cement which takes slag as a main excitation object, sodium sulfate as an excitant and mineral admixtures such as composite portland cement, fly ash and the like as a regulator. The production process does not need high-temperature calcination, does not substantially discharge carbon dioxide, can also consume a large amount of industrial waste, and reduces the pollution of the industrial waste to the environment. Therefore, the cement in the prior art is replaced by the neutral sodium salt alkali slag cement, which is more beneficial to environmental protection.
(3) In the production of aerated concrete blocks, the slaking speed of quicklime has great influence on the pouring stability of aerated concrete, and the quicklime in the production of the aerated concrete is preferably 9-15 min. After the silicone oil is added into the raw materials, the digestion speed of the quicklime can be effectively prolonged, and the pouring stability is better.
Drawings
FIG. 1 is a schematic diagram of the process steps of the preparation method of an autoclaved aerated concrete block.
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.
A preparation method of an autoclaved aerated concrete block comprises the following steps:
step S1, according to quartz tailings: fly ash: gypsum: quick lime: weighing raw materials according to the mass ratio of (35-55) to (15-35) to (3-6) to (14-17) to 10 of cement, and uniformly stirring the raw materials in a stirrer to obtain a mixed material; wherein the mass sum of the quartz tailings and the fly ash accounts for 70 percent of the total mass of the raw materials, and the mass sum of the gypsum and the quicklime accounts for 20 percent of the total mass of the raw materials;
step S2, adding water into the mixed material obtained in the step S1 according to the water-material ratio (0.44-0.52), and uniformly stirring to obtain mixed slurry;
s3, adding a certain amount of aluminum paste and additives into the mixture obtained in the step S2, and continuously stirring to obtain mixed slurry;
and S4, pouring the mixture slurry obtained in the step S3 into a mold, standing and maintaining for 4 hours in an environment at 50 ℃, removing the mold, and then putting the mold into an autoclave for autoclave curing to obtain the finished autoclaved aerated concrete block.
In some embodiments, the silica content in the quartz tailings in the step S1 is not less than 95% (by mass), and the water content is not more than 6% (by mass); the content of the calcium sulfate dihydrate in the gypsum is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.9 percent; after calcined, the calcium oxide content of the quicklime powder is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.5 percent.
In some embodiments, the cement in step S1 is a neutral sodium salt alkali slag cement.
In some embodiments, the mass of the aluminum paste powder in the step S3 is 0.05% to 0.1% of the total mass of the mixture material in the step S1, the content of the active aluminum in the aluminum paste powder is not less than 90%, and the 200-mesh screen residue is 3%. .
In some embodiments, the admixture in the step S3 is a silicone oil, and the mass of the silicone oil is 0.02% to 0.03% of the total mass of the mixed materials in the step S1.
In some embodiments, in step S4, the autoclave is maintained under vacuum for 0.5h, at a constant temperature and pressure for 1h, at a constant pressure for 6h, at a constant temperature and pressure for 2h, at a temperature of 190-200 ℃ and at a constant pressure of 1.2 MPa.
The technical solution of the present invention is further explained by the following specific examples.
The first embodiment is as follows:
step S1, according to quartz tailings: fly ash: gypsum: quick lime: weighing raw materials according to the mass ratio of 35:35:3:17:10 of the cement, and uniformly stirring the raw materials in a stirrer to obtain a mixed material. The content of silicon dioxide in the quartz tailings is not lower than 95 percent (mass percentage), and the water content is not higher than 6 percent (mass percentage); the content of the calcium sulfate dihydrate in the gypsum is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.9 percent; after calcined, the calcium oxide content of the quicklime powder is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.5 percent. The cement is neutral sodium salt alkali slag cement
Step S2, adding water into the mixed material obtained in the step S1 according to the water-material ratio of 0.44, and uniformly stirring to obtain mixed slurry;
and S3, adding a certain amount of aluminum paste and additives into the mixture obtained in the step S2, and continuously stirring to obtain mixed slurry. The mass of the aluminum powder paste is 0.05% of the total mass of the mixed materials in the step S1, the content of active aluminum in the aluminum powder paste is not less than 90%, and the 200-mesh screen residue is 3%. The additive is silicone oil, and the mass of the silicone oil is 0.02% of the total mass of the mixed materials in the step S1.
And S4, pouring the mixture slurry obtained in the step S3 into a mold, standing and maintaining for 4 hours in an environment at 50 ℃, removing the mold, and then putting the mold into an autoclave for autoclave curing to obtain the finished autoclaved aerated concrete block. The curing system in the autoclave reaction kettle comprises vacuumizing for 0.5h, heating and boosting for 1h, keeping the temperature and the pressure constant for 6h, and reducing the pressure for 2h, wherein the temperature is controlled to be 190-200 ℃, and the pressure constant is 1.2 MPa.
Example two:
step S1, according to quartz tailings: fly ash: gypsum: quick lime: weighing raw materials according to the mass ratio of 55:15:6:14:10 of the cement, and uniformly stirring the raw materials in a stirrer to obtain a mixed material. The content of silicon dioxide in the quartz tailings is not lower than 95 percent (mass percentage), and the water content is not higher than 6 percent (mass percentage); the content of the calcium sulfate dihydrate in the gypsum is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.9 percent; after calcined, the calcium oxide content of the quicklime powder is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.5 percent. The cement is neutral sodium salt alkali slag cement.
And S2, adding water into the mixed material obtained in the step S1 according to the water-material ratio of 0.52, and uniformly stirring to obtain mixed slurry.
And S3, adding a certain amount of aluminum paste and additives into the mixture obtained in the step S2, and continuously stirring to obtain mixed slurry. The mass of the aluminum powder paste is 0.1% of the total mass of the mixed materials in the step S1, the content of active aluminum in the aluminum powder paste is not less than 90%, and the 200-mesh screen residue is 3%. The additive is silicone oil, and the mass of the silicone oil is 0.03% of the total mass of the mixed materials in the step S1.
And S4, pouring the mixture slurry obtained in the step S3 into a mold, standing and maintaining for 4 hours in an environment at 50 ℃, removing the mold, and then putting the mold into an autoclave for autoclave curing to obtain the finished autoclaved aerated concrete block. The curing system in the autoclave reaction kettle comprises vacuumizing for 0.5h, heating and boosting for 1h, keeping the temperature and the pressure constant for 6h, and reducing the pressure for 2h, wherein the temperature is controlled to be 190-200 ℃, and the pressure constant is 1.2 MPa.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. The directional indicators such as front, back, left, right, end, front, etc. are only used for describing the structure, but not for limitation. 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 (6)
1. The preparation method of the autoclaved aerated concrete block is characterized by comprising the following steps:
step S1, according to quartz tailings: fly ash: gypsum: quick lime: weighing raw materials according to the mass ratio of (35-55) to (15-35) to (3-6) to (14-17) to 10 of cement, and uniformly stirring the raw materials in a stirrer to obtain a mixed material; wherein the mass sum of the quartz tailings and the fly ash accounts for 70 percent of the total mass of the raw materials, and the mass sum of the gypsum and the quicklime accounts for 20 percent of the total mass of the raw materials;
step S2, adding water into the mixed material obtained in the step S1 according to the water-material ratio (0.44-0.52), and uniformly stirring to obtain mixed slurry;
s3, adding a certain amount of aluminum paste and additives into the mixture obtained in the step S2, and continuously stirring to obtain mixed slurry;
and S4, pouring the mixture slurry obtained in the step S3 into a mold, standing and maintaining for 4 hours in an environment at 50 ℃, removing the mold, and then putting the mold into an autoclave for autoclave curing to obtain the finished autoclaved aerated concrete block.
2. The method for preparing the autoclaved aerated concrete block according to claim 1, wherein the method comprises the following steps: the content of silicon dioxide in the quartz tailings in the step S1 is not less than 95% (mass percent), and the water content is not more than 6% (mass percent); the content of the calcium sulfate dihydrate in the gypsum is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.9 percent; after calcined, the calcium oxide content of the quicklime powder is not less than 95 percent (mass percentage), and the residue of the 200-mesh sieve is 9.5 percent.
3. The method for preparing the autoclaved aerated concrete block according to claim 1, wherein the method comprises the following steps: the cement in the step S1 is neutral sodium salt alkali slag cement.
4. The method for preparing the autoclaved aerated concrete block according to claim 1, wherein the method comprises the following steps: the mass of the aluminum powder paste in the step S3 is 0.05-0.1% of the total mass of the mixed material in the step S1, the content of active aluminum in the aluminum powder paste is not less than 90%, and the residue of 200-mesh sieve is 3%.
5. The method for preparing the autoclaved aerated concrete block according to claim 1, wherein the method comprises the following steps: the additive in the step S3 is silicone oil, and the mass of the silicone oil is 0.02-0.03% of the total mass of the mixed material in the step S1.
6. The method for preparing the autoclaved aerated concrete block according to claim 1, wherein the method comprises the following steps: in the step S4, the curing system in the autoclave is that the autoclave is vacuumized for 0.5h, heated and pressurized for 1h, kept at a constant temperature and pressure for 6h, and depressurized for 2h, the temperature is controlled between 190 ℃ and 200 ℃, and the pressure is kept at a constant pressure of 1.2 MPa.
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| CN202210079838.9A CN114276112A (en) | 2022-01-24 | 2022-01-24 | Preparation method of autoclaved aerated concrete block |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105669146A (en) * | 2016-02-02 | 2016-06-15 | 福州大学 | Autoclaved aerated concrete block containing neutral sodium-salt alkali activated slag concrete and preparation method of autoclaved aerated concrete block |
| CN106082904A (en) * | 2016-06-17 | 2016-11-09 | 广州发展环保建材有限公司 | A kind of high-precision building block of steam-pressing aero-concrete and preparation method thereof |
| CN108609988A (en) * | 2018-05-22 | 2018-10-02 | 贵州省建筑材料科学研究设计院有限责任公司 | A method of producing air-entrained concrete building block using processing of fluorspar ores waste residue-quartz tailings |
| CN108774073A (en) * | 2018-05-30 | 2018-11-09 | 安徽筑园景新型建材科技有限公司 | A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder |
| CN108911614A (en) * | 2018-06-27 | 2018-11-30 | 安徽省万帮新型建材科技有限公司 | A method of air entrained concrete is prepared with modified quicklime-gangue and iron tailings |
| CN112573884A (en) * | 2020-11-13 | 2021-03-30 | 福建同利建材科技有限公司 | High-toughness alkali slag granite powder aerated concrete block and preparation method thereof |
-
2022
- 2022-01-24 CN CN202210079838.9A patent/CN114276112A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105669146A (en) * | 2016-02-02 | 2016-06-15 | 福州大学 | Autoclaved aerated concrete block containing neutral sodium-salt alkali activated slag concrete and preparation method of autoclaved aerated concrete block |
| CN106082904A (en) * | 2016-06-17 | 2016-11-09 | 广州发展环保建材有限公司 | A kind of high-precision building block of steam-pressing aero-concrete and preparation method thereof |
| CN108609988A (en) * | 2018-05-22 | 2018-10-02 | 贵州省建筑材料科学研究设计院有限责任公司 | A method of producing air-entrained concrete building block using processing of fluorspar ores waste residue-quartz tailings |
| CN108774073A (en) * | 2018-05-30 | 2018-11-09 | 安徽筑园景新型建材科技有限公司 | A kind of preparation method of the autoclave aerated concrete building block of the silicon oil modified quick lime of addition-calcium carbonate crystal whisker modification blast-furnace cinder |
| CN108911614A (en) * | 2018-06-27 | 2018-11-30 | 安徽省万帮新型建材科技有限公司 | A method of air entrained concrete is prepared with modified quicklime-gangue and iron tailings |
| CN112573884A (en) * | 2020-11-13 | 2021-03-30 | 福建同利建材科技有限公司 | High-toughness alkali slag granite powder aerated concrete block and preparation method thereof |
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Application publication date: 20220405 |