CN103864454A - Method for producing autoclaved aerated concrete building block by using desulfurized fly ash - Google Patents
Method for producing autoclaved aerated concrete building block by using desulfurized fly ash Download PDFInfo
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- CN103864454A CN103864454A CN201210536350.0A CN201210536350A CN103864454A CN 103864454 A CN103864454 A CN 103864454A CN 201210536350 A CN201210536350 A CN 201210536350A CN 103864454 A CN103864454 A CN 103864454A
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- building block
- fly ash
- concrete building
- aerated concrete
- desulfurized
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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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention discloses a method for producing an autoclaved aerated concrete building block by using desulfurized fly ash, wherein the raw materials comprise, by weight, 525-675 parts of ordinary fly ash, 450-600 parts of desulfurized fly ash, 180-255 parts of quick lime, 45-120 parts of carbide slag, 75 parts of cement, 840-870 parts of water, and 0.98 part of aluminum powder. The preparation method comprises: (1) carrying out a crushing treatment on various raw materials; (2) adding water to the raw materials, and stirring into a material slurry; (3) carrying out casting and primary curing; and (4) conveying the building block into an autoclave to carry out steam curing. According to the present invention, the desulfurized fly ash is adopted as the main raw material to produce the autoclaved aerated concrete building block and prepare the product meeting the corresponding index requirements, such that the resource utilization approach of the desulfurized fly ash is wide and broad, the influence of the desulfurized fly ash on the environment is reduced, the raw material cost of the product is reduced, and a certain economic benefit is provided so as to release the supply limitation problem of the novel wall raw materials and provide scientific guidance for application of the solid wastes in the novel wall.
Description
(1) technical field
The present invention relates to a kind of autoclave aerated concrete building block, specifically taking desulfurized powder coal ash as main material production autoclave aerated concrete building block and method thereof.
(2) background technology
Enter 21 century, along with the continuous growth of population and the mankind are to excessively the asking for of natural resources, it is exhausted that various resources are tending towards.Particularly, in building trade, how to utilize industrial residue for raw materials for production, prepare novel wall material energy-conservation, that joint is native, profit is useless, become people's main research in recent years.So, a collection of novel wall material, as autoclave aerated concrete building block, polystyrene sandwich panel, structural clay tile etc. arise at the historic moment, wherein autoclave aerated concrete building block with the performances such as its light weight, the useless joint of profit soil, heat insulating, sound-adsorbing sound-insulating hung become current walling develop in one of the material of tool potentiality.Autoclave aerated concrete building block is conventionally taking ordinary fly ash, unslaked lime, gypsum and cement etc. as main raw material, through stirring, cast, foaming, quietly stop, cutting and high-pressure steaming and cultivating make the material with thermal and insulating performance.
Along with the development of national economy and the raising of people's level of understanding, China has progressively proposed the scheme of total utilization of PCA and resource utilization, and commercial road has also been gone in the utilization of flyash.A large amount of SO, in collecting flyash, have also discharged in air in coal-burning power plant
2gas, must cause pollution to atmosphere and the threat of people ' s health like this.Environmental administration requires the waste gas that coal-burning power plant produces must remove SO wherein before discharge for this reason
2gas.The Wingdale that power plant's sulphur removal is calcium base absorption base is often sprayed onto firing space top, and Wingdale moment burning subsequently generates CaO, newly-generated CaO and SO
2carry out sulfation reaction and generate CaSO
4, and collect in fly-ash separator with flying dust, the solid waste of collecting is called desulfurized powder coal ash.Desulfurized powder coal ash, is difficult to effectively utilize at composition, have larger differently in nature from ordinary fly ash at present; If just stack simply desulfurized powder coal ash, not only will take a large amount of soils, also can cause serious secondary pollution to environment.Therefore there is again new problem and a difficult problem
---the comprehensive utilization of desulfurized powder coal ash.
At present, carbide slag is mainly derived from the production of the Chemicals such as polyvinyl chloride (PVC), acetylene, polyvinyl alcohol.Carbide slag is in carbide-feed generator, and calcium carbide is hydrolyzed and the trade waste of generation, the residue after namely calcium carbide hydrolysis, and main chemical compositions is Ca (OH)
2(massfraction is more than 90%), also contains SiO in addition
2, Al
2o
3, Fe
2o
3, CaSO
4deng, chemical composition and slaked lime are basic identical.Carbide slag is strong basicity, therefore serious environment pollution.Carbide slag is as can not get appropriate processing, and directly air storage, will take a large amount of soils, and pollutes neighbouring soil and water body.Therefore, carry out the comprehensive utilization of carbide slag, can not only obtain economic benefit, also there is good environment and social benefit.
According to national energy-saving environmental protection production requirement and the relevant policies to industrial residue comprehensive utilization, to carry out and adopt desulfurized powder coal ash, carbide slag etc. to produce autoclave aerated concrete building block, thereby make that autoclave aerated concrete building block is turned waste into wealth, light weight, the fine quality such as energy-conservation, make it there is good economic benefit and wide application prospect, for the energy-conservation and All-round, Coordinated and Sustainable Development of entire society contributes.
Successfully utilize large volume desulfurized powder coal ash, carbide slag etc. to produce autoclave aerated concrete building block, can alleviate the in short supply of autoclave aerated concrete building block starting material ordinary fly ash and unslaked lime, because research ordinary fly ash is for the production of the comparative maturity of technology of autoclave aerated concrete building block, still along with SO gets rid of to coal-burning power plant's waste gas in country
2forbidding of gas, increasing Installation in Plant desulfurizer, the output of Here it is ordinary fly ash constantly reduces, desulfurized powder coal ash amount is more and more, give desulfurized powder coal ash less for the production of autoclave aerated concrete building block research, in addition the calcium carbide waste slag in chemical plant is close with unslaked lime composition, has breakthrough invention therefore carry out the technical study of the solid waste production autoclave aerated concrete building blocks such as desulfurized powder coal ash, carbide slag simultaneously.
The technical information of some close aspects was also disclosed in Chinese patent application, if patent publication No. is that CN101353266, name are called " utilizing calcium carbide waste slag for raw material production gas concrete technique "; Patent publication No. be CN102060496, name be called " a kind of preparation method of rock ballast powder aerated concrete ", with desulfurated plaster, ballast powder, cement, lime, ground granulated blast furnace slag etc. for preparing air-entrained concrete building block; Patent publication No. is that CN101581131, name are called " a kind of non-autoclaved aerated concrete building block and manufacture method ", and the raw materials of the air-entrained concrete building block of development is ordinary Portland cement, flyash, fine grinding quicklime powder, desulfurated plaster and whipping agent.Document " utilizes flyash and carbide slag to produce air-entrained concrete building block " to have studied the research with ordinary fly ash and calcium carbide waste slag production building block, with desulfurized powder coal ash in the present invention be not same substance; The raw materials for production of document " sintering flue gas desulfurization ash is prepared the research of autoclave aerated concrete building block " are desulphurize fly ash, ordinary fly ash, grain slag, cement, aluminium powder, water material, caustic soda; Document " sintering desulfuration ash is prepared the research of autoclave aerated concrete building block " is mixed again ordinary fly ash, grain slag, cement, aluminium powder by desulphurize fly ash and is prepared autoclave aerated concrete building block.From the above, prepare autoclave aerated concrete building block taking carbide slag, desulfurized powder coal ash, ordinary fly ash, lime as starting material, also there is no at present scholar's research technique, this invention more can utilize industrial residue to greatest extent, creates good economic benefit, environmental benefit and social benefit.From the above, prepare autoclave aerated concrete building block taking carbide slag, desulfurized powder coal ash, ordinary fly ash, lime as starting material, more can utilize to greatest extent industrial residue, create good economic benefit, environmental benefit and social benefit.
(3) summary of the invention
The object of the invention is, in order to solve a large amount of also problems of serious environment pollution of stacking of the solid waste such as carbide slag and desulfurized powder coal ash, provides and has utilized desulfurized powder coal ash for main material production autoclave aerated concrete building block and method thereof.
The present invention is realized by following technical scheme, described autoclave aerated concrete building block, is made up of the raw material of following parts by weight: 0.98 part of ordinary fly ash 525 ~ 675, desulfurized powder coal ash 450 ~ 600, unslaked lime 180 ~ 255, carbide slag 45 ~ 120, cement 75, water 840 ~ 870, aluminium powder.
The preparation method of autoclave aerated concrete building block:
(1) first above-mentioned various raw materials are carried out to pulverization process, aluminium powder is prepared into suspension.
(2) in the manned situation of various material metering rear molds, raw material adds water and stirs into slip, before slurry cast, about half a minute, adds aluminium powder suspension.
(3) cast rear mold pushes and just supports chamber, and temperature control also keeps one section of curing time, cuts into piece after just forming type.
(4) finally above-mentioned building block is sent in autoclave steam-cured.
In step (2), the temperature of injected water is 60～65 DEG C as mentioned above.
The temperature of just supporting as mentioned above chamber in step (3) is controlled between 55～65 DEG C, and curing time is 150min～180min.
As mentioned above in step (4), in autoclave, carry out syllogic steam curing conservation, boost: 0～1.1MPa, pressure rising time 2.5h; Constant voltage: 1.1MPa, constant voltage time 5.5h; Step-down: 1.1MPa～0, step-down time 2h.
Superiority of the present invention is: adopt desulfurized powder coal ash, carbide slag etc. to produce autoclave aerated concrete building block, according to the physical property of desulphurize fly ash, carbide slag and chemical composition, carry out new formulating of recipe, process modification, reach and prepare the product that meets corresponding index requirement.Thereby make the recycling approach of desulfurized powder coal ash, carbide slag become wider, not only reduce their impacts on environment, but also can reduce the material cost of product, produce certain economic benefit.This not only can alleviate the problem of new wall material raw material supply anxiety, and the guidance of science is provided for the application of these solid waste in new wall material simultaneously.
Be mixed with autoclave aerated concrete building block according to aforementioned proportion and have following advantage:
(1) the use desulfurized powder coal ash of the large volume of energy, has alleviated ordinary fly ash problem in short supply;
(2) mix desulfurized powder coal ash and carbide slag part simultaneously replace ordinary fly ash and unslaked lime, not only utilized solid waste, also saved the consumption of unslaked lime, produced certain economic benefit;
(3) being mixed with in desulfurized powder coal ash and carbide slag slip, aluminium powder volume brings up to 0.065%, and product unit weight is reduced, and air hole structure optimization, intensity raise;
(4), by verification experimental verification, quality product requires to have reduced to the activity index of unslaked lime;
(5) yield rate of product is brought up to more than 96%, and base substrate air cleft has not almost had, and is mainly that air cleft is many because intensity is low originally, mostly is a minimum damage layer;
(6) intensity of product and unit weight are all better than the performance of air-entrained concrete building block in international standard;
(7) outward appearance of product is blue.
Adopting carbide slag and desulfurized powder coal ash to produce after autoclave aerated concrete building block, also there is following variation in production technique:
(1) steam pressure pressure drops to 1.1MPa by 1.2MPa, and the constant temperature and pressure time drops to 5.5h by 8h;
(2) build temperature and reduced by 4～6 DEG C, drop to 55～65 DEG C;
(3) quietly stop time lengthening, extended to 150min～180min by 90min～120min.
(4) the increasing temperature and pressure time drops to 2.5h by original 3h.
(4) embodiment
Embodiment 1: with original production technique production air-entrained concrete building block of the present invention.
Take off the raw material of row part by weight: ordinary fly ash 675g, desulfurized powder coal ash 450g, unslaked lime (activity index is 45) 180g, carbide slag 120g, cement 75g, water 840g, aluminium powder 0.98g carry out pulverization process.In the manned situation of mould, inject the water of 60 DEG C, various materials are carried out to slip stirring (aluminium powder adds water treatment separately), before material cast, about half a minute, add aluminium powder suspension.Cast rear mold pushes just supports chamber, and the room temperature of curing room is 60 DEG C, and curing time is 150min.After just forming type, cut into the building block that is of a size of 100mm × 100mm × 100mm, then send in autoclave steam-cured.In autoclave, curing condition is for boosting: 0～1.2MPa, pressure rising time 3h, constant voltage: 1.2MPa, constant voltage time 8h; Step-down: 1.2MPa～0, step-down time 3h.
Embodiment 2: raw materials used weight is: ordinary fly ash 600g, desulfurized powder coal ash 525g, unslaked lime 255g(activity index are 45), carbide slag 45g, cement 75g, water 840g, aluminium powder 0.98g.Its step as described in Example 1.Be wherein 60 DEG C to injecting water temperature in raw material, slip curing room room temperature is 60 DEG C, and curing time is 150min.After block forming in autoclave curing condition for boosting: 0～1.1MPa, pressure rising time 2.5h; Constant voltage: 1.1MPa, constant voltage time 5.5h; Step-down: 1.1MPa～0, step-down time 2h.
Embodiment 3: raw materials used weight is: ordinary fly ash 525g, desulfurized powder coal ash 600g, unslaked lime 225g(activity index are 65), carbide slag 75g, cement 75g, water 840g, aluminium powder 0.98g.Its step as described in Example 1.Be wherein 65 DEG C to injecting water temperature in raw material, slip curing room room temperature is 65 DEG C, and curing time is 180min.After block forming in autoclave curing condition for boosting: 0～1.1MPa, pressure rising time 2.5h; Constant voltage: 1.1MPa, constant voltage time 5.5h; Step-down: 1.1MPa～0, step-down time 2h.
Embodiment 4: raw materials used weight is: ordinary fly ash 600g, desulfurized powder coal ash 525g, unslaked lime 180g(activity index are 65), carbide slag 120g, cement 75g, water 870g, aluminium powder 0.98g.Its step as described in Example 1.Wherein injecting water temperature is 65 DEG C, and slip curing room room temperature is 65 DEG C, and curing time is 180min.After block forming in autoclave curing condition for boosting: 0～1.1MPa, pressure rising time 2.5h; Constant voltage: 1.1MPa, constant voltage time 5.5h; Step-down: 1.1MPa～0, step-down time 2h.
Embodiment 5: raw materials used weight is: ordinary fly ash 600g, desulfurized powder coal ash 525g, unslaked lime 200g(activity index are 65), carbide slag 80g, cement 75g, water 850g, aluminium powder 0.98g.Its step as described in Example 1.Be wherein 63 DEG C to injecting water temperature in raw material, slip curing room room temperature is 60 DEG C, and curing time is 165min.After block forming in autoclave curing condition for boosting: 0～1.1MPa, pressure rising time 2.5h; Constant voltage: 1.1MPa, constant voltage time 5.5h; Step-down: 1.1MPa～0, step-down time 2h.
Subordinate list: the properties of autoclave aerated concrete building block
Test knownly by above embodiment, although adopt new production technique to reduce the requirement of reaction, properties still can meet the performance index requirement of GB to B06 building block.
Claims (4)
1. utilize desulfurized powder coal ash to produce the method for autoclave aerated concrete building block, it is characterized in that being formed by the raw material of following portions by weight: 0.98 part of ordinary fly ash 525 ~ 675, desulfurized powder coal ash 450 ~ 600, unslaked lime 180 ~ 255, carbide slag 45 ~ 120, cement 75, water 840 ~ 870, aluminium powder; The preparation method of autoclave aerated concrete building block:
Step 1: first above-mentioned various raw materials are carried out to pulverization process, aluminium powder is prepared into suspension;
Step 2: in the manned situation of various material metering rear molds, raw material adds water and stirs into slip adds aluminium powder suspension about half a minute before slurry cast;
Step 3: cast rear mold pushes just supports chamber, and temperature control also keeps one section of curing time, cuts into piece after just forming type;
Step 4: finally above-mentioned building block is sent in autoclave steam-cured.
2. according to the method for utilizing desulfurized powder coal ash to produce autoclave aerated concrete building block claimed in claim 1, the temperature that it is characterized in that injected water in described step 2 is 60～65 DEG C.
3. according to the method for utilizing desulfurized powder coal ash to produce autoclave aerated concrete building block claimed in claim 1, it is characterized in that the temperature of just supporting chamber in described step 3 is controlled between 55～65 DEG C, curing time is 150min～180min.
4. produce the method for autoclave aerated concrete building block according to the desulfurized powder coal ash that utilizes claimed in claim 1, it is characterized in that in autoclave, carrying out in described step 4 syllogic steam curing conservation, boost phase pressure-controlling is at 0～1.1MPa, pressure rising time 2.5h; Constant-voltage phase pressure-controlling is at 1.1MPa, constant voltage time 5.5h; Buck stage pressure-controlling is in 1.1MPa～0, step-down time 2h.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193391A (en) * | 2014-08-22 | 2014-12-10 | 山东省环能设计院有限公司 | Aerated concrete and preparation method thereof |
| CN104761275A (en) * | 2015-03-03 | 2015-07-08 | 孙德民 | New method for comprehensive treatment of waste desulfurized powder to produce assembled building energy saving and thermal insulation component |
| CN117125949A (en) * | 2023-08-31 | 2023-11-28 | 山东鲁泰装配式装修材料有限公司 | Precoated plate with A-level combustion performance and preparation method thereof |
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| MX2007015256A (en) * | 2007-12-04 | 2009-06-03 | Luis Angel Zuazua Guzman | Formula and process for the manufacture of products made of calcium hydro silicate cellular concrete. |
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2012
- 2012-12-13 CN CN201210536350.0A patent/CN103864454A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2007015256A (en) * | 2007-12-04 | 2009-06-03 | Luis Angel Zuazua Guzman | Formula and process for the manufacture of products made of calcium hydro silicate cellular concrete. |
Non-Patent Citations (1)
| Title |
|---|
| 刘素霞等: ""利用工业废渣生产新型墙体材料的试验研究"", 《新型建筑材料》, no. 11, 30 November 2012 (2012-11-30) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193391A (en) * | 2014-08-22 | 2014-12-10 | 山东省环能设计院有限公司 | Aerated concrete and preparation method thereof |
| CN104761275A (en) * | 2015-03-03 | 2015-07-08 | 孙德民 | New method for comprehensive treatment of waste desulfurized powder to produce assembled building energy saving and thermal insulation component |
| CN117125949A (en) * | 2023-08-31 | 2023-11-28 | 山东鲁泰装配式装修材料有限公司 | Precoated plate with A-level combustion performance and preparation method thereof |
| CN117125949B (en) * | 2023-08-31 | 2024-04-30 | 山东鲁泰装配式装修材料有限公司 | Precoated plate with A-level combustion performance and preparation method thereof |
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Application publication date: 20140618 |