CN111253138A - Production process of autoclaved aerated concrete block - Google Patents
Production process of autoclaved aerated concrete block Download PDFInfo
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- CN111253138A CN111253138A CN202010072910.6A CN202010072910A CN111253138A CN 111253138 A CN111253138 A CN 111253138A CN 202010072910 A CN202010072910 A CN 202010072910A CN 111253138 A CN111253138 A CN 111253138A
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- Prior art keywords
- gypsum
- aerated concrete
- autoclaved aerated
- slurry
- production process
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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
- C04B28/14—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 calcium sulfate cements
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
-
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to the technical field of comprehensive utilization of fly ash, in particular to a production process of an autoclaved aerated concrete block. The method comprises the following steps: adding water, fly ash and RGM reinforcing agent into a pulping stirrer, and stirring to prepare pulp; feeding the slurry into a pouring stirring tank, adding lime and aluminum powder, stirring uniformly, and pouring the slurry into a mold box; moving the mold box with the poured slurry to a static curing room for static gas generation; after the rest gas generation is finished, the die box and the green body are conveyed to a cutting machine by a travelling crane for cutting; and (4) grouping the cut building block blanks by using a travelling crane, and then sending the grouped building block blanks into an autoclave to obtain finished autoclaved aerated concrete building block products. The process disclosed by the invention not only reduces the cost and improves the efficiency and the quality, but also utilizes a large amount of solid wastes such as red mud, desulfurized gypsum, red gypsum and the like, changes waste into valuable through comprehensive utilization, and solves the problem of environmental protection and solid waste treatment in the industries.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of fly ash, in particular to a production process of an autoclaved aerated concrete block.
Background
The autoclaved aerated concrete block is a porous concrete product prepared by taking fly ash, lime, cement, gypsum, slag and the like as main raw materials, adding a proper amount of a gas former, a regulator and a bubble stabilizer, and carrying out the processes of burdening, stirring, pouring, standing, cutting, high-pressure steam curing and the like.
The traditional autoclaved aerated concrete block production process has the following defects: 1. the consumption of lime and cement is large, and the cost is high; 2. the rest time is long, and the production efficiency is low; 3. the average strength of the product discharged from the kettle is low.
Disclosure of Invention
The invention aims to provide a production process of an autoclaved aerated concrete block to solve the technical problem.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the production process of the autoclaved aerated concrete block is characterized by comprising the following steps of: the method comprises the following steps:
1. pulping: adding water, fly ash and RGM reinforcing agent into a pulping stirrer, stirring for 30 minutes, and heating the pulping temperature to 45 ℃ by using steam when the measured diffusion degree of the pulp reaches 21-22 cm;
2. pouring: sending the slurry prepared in the step 1 into a pouring stirring tank by using a slurry pump, adding lime and aluminum powder into the pouring stirring tank, uniformly stirring, and pouring the slurry into a mold box;
3. standing: moving the mold box with the poured slurry to a resting room for standing and gas generation, wherein the temperature of the resting room is kept at 50 +/-5 ℃, and the standing and gas generation time is 80-90 minutes;
4. cutting: after the static curing and gas evolution are finished, the blank body reaches the cutting hardness, and then the die box and the blank body are conveyed to a cutting machine by a travelling crane for cutting;
5. steaming and pressing: and (3) grouping the cut building block blanks by using a travelling crane, then sending the blocks into an autoclave, and carrying out autoclave for 5-6 hours by using steam with the pressure of 0.9-1.2MPa and the temperature of 175-195 ℃ to obtain the finished product of the autoclaved aerated concrete building block.
Further, the RGM enhancer is a mixture of red mud and gypsum, wherein the weight percentage of the red mud is 34%, and the weight percentage of the gypsum is 66%.
Preferably, the gypsum is one or more of white gypsum, desulfurized gypsum and red gypsum.
Preferably, the red mud and the gypsum are filtered to remove particles with the diameter of more than 0.5cm, and then are fully and uniformly mixed to prepare the RGM reinforcing agent.
Has the advantages that: compared with the traditional production process, the production process has the advantages that:
1. the cost advantage is as follows: the consumption of lime per unit is saved by 5 kg/cube, the consumption of aluminum powder is saved by 15 g/cube, meanwhile, cement is not used, 15 kg/cube of cement is saved, the cost of raw materials can be saved by 10 yuan/cube, the production line of 40 ten thousand cubes of annual production capacity can be saved, and the cost can be saved by 400 ten thousand yuan per year;
2. production efficiency: the rest time is shortened by 20 minutes/module, and the daily yield can be increased by 260m3Can increase yield by 8 ten thousand meters each year3The production efficiency is improved to a great extent;
3. and (3) discharging the steel from the kettle: the average strength of the autoclaved aerated concrete block produced by the process is 1MPa higher than that of the block produced by the traditional process;
4. and (3) environmental protection treatment: a large amount of solid wastes such as red mud generated by alumina enterprises, desulfurized gypsum generated by thermal power plants, red gypsum generated by titanium dioxide enterprises and the like are utilized, and the problem of environmental protection and solid waste treatment in the industries is solved by changing waste into valuable through comprehensive utilization.
Detailed Description
The invention is further described with reference to specific examples.
Example 1:
the production process of the autoclaved aerated concrete block comprises the following steps:
1. pulping: adding 1120 kg of water (specific gravity 40%), 1400 kg of fly ash (specific gravity 50%) and 280 kg of RGM reinforcing agent (specific gravity 10%) into a pulping stirrer, and stirring for 30 minutes; when the measured diffusion degree of the pulp reaches 21-22cm, the pulping temperature is heated to 45 ℃ by using steam.
The RGM reinforcing agent is a mixture of red mud and gypsum, wherein the weight percentage of the red mud is 34%, and the weight percentage of the gypsum is 66%; filtering out particles with the diameter of more than 0.5cm from the red mud and the gypsum, and then fully and uniformly mixing to prepare the RGM reinforcing agent; the gypsum is one or more of white gypsum, desulfurized gypsum and red gypsum.
2. Pouring: sending the slurry prepared in the step 1 into a pouring stirring tank by using a slurry pump, and sequentially adding 280 kg of lime and 2.5 kg of aluminum powder into the pouring stirring tank; after stirring uniformly, the slurry was poured to a volume of 3.5m3In the mould box.
3. Standing: moving the mould box which is poured with the slurry to a resting room for standing and air-forming, wherein the temperature of the resting room is kept at 50 +/-5 ℃, and the standing and air-forming time is 80-90 minutes.
4. Cutting: and (5) after the static curing and gas evolution are finished, after the blank body reaches the hardness of cutting, conveying the die box and the blank body to a cutting machine by using a travelling crane, and cutting according to the specification and the size of the customer requirement.
5. Steaming and pressing: grouping the cut building block blanks by using a travelling crane, then sending the building block blanks into an autoclave, and carrying out autoclave for 5-6 hours by using steam with the pressure of 0.9-1.2MPa and the temperature of 175-195 ℃ to obtain finished products of the autoclaved aerated concrete building blocks; the finished product of the autoclaved aerated concrete block has the kettle-discharging strength of more than 3.5MPa and the volume weight of 625kg/m3Within.
In the pulping process of the production process, the chemical reaction product and the strength enhancing mechanism after the RGM reinforcing agent is added are as follows:
1. red mud (containing NaOH), gypsum (containing CaSO)4·2H2O) → ettringite
During the gelatinization reaction of the autoclaved aerated concrete block, the red mud and the gypsum can promote the generation of ettringite, and when the slurry generates ettringite in the early stage, the ettringite grown in a static culture in a mould box expands in volume and fills pores, so that the slurry is compact and favorable for strength development.
2. Red mud (containing NaOH), fly ash (containing Non-Crystall SiO)2) → geopolymers
Meanwhile, the red mud and the fly ash can promote geopolymerization reaction to generate geopolymer, and the geopolymer has excellent characteristics of high strength, high-temperature durability and the like.
3. Data comparison of the production process of the invention with the conventional production process
| Process for the preparation of a coating | Lime unit consumption | Amount of cement used | Rest time | Average strength of finished product discharged from kettle |
| The process of the invention | 80kg/m3 | 0 | 80-90min | 3.5MPa |
| Conventional process | 85kg/m3 | 15kg/m3 | 100-110min | 2.5MPa |
4. The application of the RGM reinforcing agent is not only beneficial to reducing the cost and improving the efficiency and the quality in the autoclaved aerated concrete block industry, but also more important contributes to utilizing a large amount of solid wastes such as red mud produced by an alumina enterprise, desulfurized gypsum produced by a thermal power plant, red gypsum produced by a titanium dioxide enterprise and the like, changing waste into valuables by comprehensive utilization, and solving the problem of environmental protection and solid waste treatment in the industries.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. The production process of the autoclaved aerated concrete block is characterized by comprising the following steps of: the method comprises the following steps:
(1) pulping: adding water, fly ash and RGM reinforcing agent into a pulping stirrer, stirring for 30 minutes, and heating the pulping temperature to 45 ℃ by using steam when the measured diffusion degree of the pulp reaches 21-22 cm;
(2) pouring: sending the slurry prepared in the step (1) into a pouring stirring tank by using a slurry pump, adding lime and aluminum powder into the pouring stirring tank, and pouring the slurry into a mold box after uniformly stirring;
(3) standing: moving the mold box with the poured slurry to a resting room for standing and gas generation, wherein the temperature of the resting room is kept at 50 +/-5 ℃, and the standing and gas generation time is 80-90 minutes;
(4) cutting: after the static curing and gas evolution are finished, the blank body reaches the cutting hardness, and then the die box and the blank body are conveyed to a cutting machine by a travelling crane for cutting;
(5) steaming and pressing: and (3) grouping the cut building block blanks by using a travelling crane, then sending the blocks into an autoclave, and carrying out autoclave for 5-6 hours by using steam with the pressure of 0.9-1.2MPa and the temperature of 175-195 ℃ to obtain the finished product of the autoclaved aerated concrete building block.
2. The autoclaved aerated concrete block production process according to claim 1, which is characterized in that: the RGM reinforcing agent is a mixture of red mud and gypsum, wherein the weight percentage of the red mud is 34%, and the weight percentage of the gypsum is 66%.
3. The autoclaved aerated concrete block production process according to claim 2, characterized in that: the gypsum is one or more of white gypsum, desulfurized gypsum and red gypsum.
4. The autoclaved aerated concrete block production process according to claim 2, characterized in that: and filtering the red mud and the gypsum to remove particles with the diameter of more than 0.5cm, and then fully and uniformly mixing to obtain the RGM reinforcing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010072910.6A CN111253138A (en) | 2020-01-11 | 2020-01-11 | Production process of autoclaved aerated concrete block |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010072910.6A CN111253138A (en) | 2020-01-11 | 2020-01-11 | Production process of autoclaved aerated concrete block |
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| CN111253138A true CN111253138A (en) | 2020-06-09 |
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| CN202010072910.6A Pending CN111253138A (en) | 2020-01-11 | 2020-01-11 | Production process of autoclaved aerated concrete block |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111763059A (en) * | 2020-07-16 | 2020-10-13 | 上海百奥恒再生资源有限公司 | Process for producing autoclaved aerated concrete blocks by utilizing desulfurized gypsum wastewater |
| CN113603436A (en) * | 2021-09-07 | 2021-11-05 | 上海百奥恒再生资源有限公司 | Comprehensive utilization method of desulfurized gypsum wastewater |
| CN113696306A (en) * | 2021-09-10 | 2021-11-26 | 上海百奥恒再生资源有限公司 | High-efficiency reinforcing process for autoclaved aerated concrete block |
| CN115819068A (en) * | 2022-11-21 | 2023-03-21 | 上海百奥恒新材料有限公司 | Composition and method for preparing autoclaved aerated concrete block |
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| CN110511056A (en) * | 2019-09-05 | 2019-11-29 | 许言言 | A kind of foam concrete block and preparation method thereof |
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Patent Citations (5)
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| KR20150121297A (en) * | 2014-04-17 | 2015-10-29 | 한국건설생활환경시험연구원 | Eco-friendly aggregate decreasing heat and alkalinity, and method for manufacturing the same, concrete composition |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111763059A (en) * | 2020-07-16 | 2020-10-13 | 上海百奥恒再生资源有限公司 | Process for producing autoclaved aerated concrete blocks by utilizing desulfurized gypsum wastewater |
| CN113603436A (en) * | 2021-09-07 | 2021-11-05 | 上海百奥恒再生资源有限公司 | Comprehensive utilization method of desulfurized gypsum wastewater |
| CN113696306A (en) * | 2021-09-10 | 2021-11-26 | 上海百奥恒再生资源有限公司 | High-efficiency reinforcing process for autoclaved aerated concrete block |
| CN115819068A (en) * | 2022-11-21 | 2023-03-21 | 上海百奥恒新材料有限公司 | Composition and method for preparing autoclaved aerated concrete block |
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Application publication date: 20200609 |