CN112209647B - Green energy-saving artificial lightweight aggregate and preparation method thereof - Google Patents
Green energy-saving artificial lightweight aggregate and preparation method thereof Download PDFInfo
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- CN112209647B CN112209647B CN202011103706.2A CN202011103706A CN112209647B CN 112209647 B CN112209647 B CN 112209647B CN 202011103706 A CN202011103706 A CN 202011103706A CN 112209647 B CN112209647 B CN 112209647B
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- aggregate
- steel slag
- carbon dioxide
- slag powder
- lightweight aggregate
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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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
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of green energy-saving artificial lightweight aggregate. The method comprises the following steps: selecting fine-ground converter steel slag powder as raw material(ii) a Putting the steel slag powder into granulation equipment; introducing carbon dioxide into the granulation equipment to reach a certain concentration; providing granulation water at a certain speed and carrying out artificial aggregate molding to obtain an aggregate blank; and collecting the obtained aggregate blank, and putting the aggregate blank into an environment with the humidity of 50-95% or a carbon dioxide curing environment box for subsequent curing. The artificial lightweight aggregate prepared by the method has the porosity of 20-50 percent and the bulk density of 600-1000kg/m3But is not limited to various heat insulating materials and decorative materials. The method does not need a foaming agent and high-temperature calcination, is simple and easy to implement, has low cost, can fix carbon dioxide, reduce carbon emission, is green and environment-friendly, provides a novel production method for preparing the lightweight aggregate for the artificial sandstone aggregate industry, and has important significance.
Description
Technical Field
The invention belongs to the field of green building materials, and particularly relates to a green energy-saving artificial lightweight aggregate and a preparation method thereof.
Background
The light aggregate is spherical in appearance, hard in surface, rough and porous in the interior, and has the main physical performance characteristics of low density and high porosity. The lightweight aggregate is used for replacing common aggregate in the concrete, so that the quality of a building can be effectively reduced, the heat preservation and insulation and sound absorption and noise reduction capabilities are improved, and the additional value is higher. At present, the lightweight aggregate is widely applied to the building industry, including fabricated building structural members, high-rise building heat-insulation building blocks and the like, and is also used for preparation of sponge urban water seepage and storage materials, wetland floating bed green plant cultivation and the like. The traditional lightweight aggregate comprises ceramsite, expanded perlite, expanded vermiculite and the like, the preparation process relates to the use of clay, shale, perlite, vermiculite and other materials and a high-temperature calcination technology, and the energy consumption is high.
The steel slag is a byproduct in the steel industry and is rich in elements such as calcium, silicon, iron, magnesium and the like. The mineral aggregate has the problems of volume stability, can harm the structural safety of buildings when being directly used as concrete aggregate, and simultaneously has low hydration activity of the contained minerals, so that the mineral aggregate cannot be used as an auxiliary cementing material to be applied to the building industry. Researches in recent years prove that the activity of the steel slag can be efficiently excited by accelerated carbonization, and a large amount of calcium and magnesium minerals contained in the steel slag can rapidly react with carbon dioxide to release a large amount of heat and generate a reaction product with cementing capacity.
Disclosure of Invention
The invention provides an environment-friendly and energy-saving artificial lightweight aggregate and a preparation method thereof, aiming at the problems that the common lightweight aggregate consumes more natural resources, has high energy consumption in the preparation process, large carbon emission and the like. The invention takes the solid waste (fine converter slag powder) in the steel industry as the raw material, and realizes the preparation of the green and energy-saving lightweight aggregate by applying the accelerated carbonization technology in the granulation process. The process does not need additional foaming materials, only needs to increase the water consumption in the traditional granulation process, and produces the porous aggregate by the way that a great deal of heat is released through the carbonization reaction between the converter steel slag powder and the carbon dioxide so as to evaporate the bonding water in the aggregate blank.
The green energy-saving artificial lightweight aggregate provided by the invention takes the steel slag as the only solid material, the particle size distribution of the steel slag is 1.18-20 mm, the porosity is 20-50%, and the loose bulk density is 1000kg/m3。
The invention relates to a preparation method of green energy-saving artificial lightweight aggregate, which comprises the following steps:
step one, using finely ground converter steel slag powder as a raw material for preparing aggregate, and controlling the average particle size of steel slag powder particles to be 1-100 mu m;
step two, putting the steel slag powder in the step one into a granulation device, and introducing carbon dioxide gas until the concentration of the carbon dioxide in the granulation device reaches 20% -100%, so as to form a gas-solid blending environment mainly containing the steel slag powder and the carbon dioxide;
step three, according to water: preparing granulation water according to the standard that the mass ratio of the steel slag powder is 0.2: 1-0.5: 1, and introducing the granulation water into the granulation environment in the second step in the form of atomized water beads at the speed of 50 mL/min-100 mL/min to form a steel slag powder-carbon dioxide-water blending environment;
fourthly, operating granulation equipment in the blending environment of the steel slag powder, the carbon dioxide and the water in the third step to obtain an artificial aggregate blank;
fifthly, placing the artificial aggregate blank obtained in the fourth step in an environment with the temperature of 20-40 ℃, the relative humidity of 50-95% and the carbon dioxide concentration of 0-100% for subsequent curing for 1-4 d to obtain artificial lightweight aggregate;
the invention has the beneficial effects that:
1. the main raw material of the green energy-saving artificial lightweight aggregate is steel slag which is a waste in the steel industry, and the steel slag can be fully digested and piled up to promote the large-scale utilization of the steel slag; meanwhile, the accelerated carbonization technology is adopted, so that carbon dioxide can be captured, the carbon footprint of the aggregate is reduced, and the method is green and environment-friendly.
2. Described in the inventionThe preparation method of the green energy-saving artificial lightweight aggregate can control the bulk density of the obtained aggregate to be 500-1000kg/m3Meanwhile, the method is simple, has low requirement on equipment, does not use a high-temperature calcination technology, and saves energy.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The green energy-saving artificial lightweight aggregate and the preparation method thereof of the embodiment specifically comprise the following steps:
step one, using fine converter steel slag powder with the average grain size of 6 mu m as a raw material for preparing aggregate;
step two, putting the steel slag powder in the step one into a granulation device, and introducing carbon dioxide gas until the concentration of the carbon dioxide in the granulation device reaches 20%, so as to form a gas-solid blending environment of the steel slag powder and the carbon dioxide;
step three, according to water: preparing granulation water according to the standard that the mass ratio of the steel slag powder is 0.3:1, and introducing the granulation water into the granulation environment in the second step in the form of atomized water drops at the speed of 50mL/min to form a steel slag powder-carbon dioxide-water blending environment;
fourthly, operating granulation equipment in the blending environment of the steel slag powder, the carbon dioxide and the water in the third step to obtain an artificial aggregate blank;
and step five, placing the artificial aggregate blank obtained in the step four in an environment with the temperature of 20 ℃, the relative humidity of 95% and the carbon dioxide concentration of 0% for subsequent curing for 1d to obtain the artificial lightweight aggregate.
The obtained aggregate has particle size of 1.18-20 mm, porosity of 40%, and bulk density of 800kg/m3。
Example 2
The green energy-saving artificial lightweight aggregate and the preparation method thereof of the embodiment specifically comprise the following steps:
step one, using fine converter steel slag powder with the average grain size of 20 mu m as a raw material for preparing aggregate;
step two, putting the steel slag powder in the step one into a granulation device, and introducing carbon dioxide gas until the concentration of the carbon dioxide in the granulation device reaches 50%, so as to form a gas-solid blending environment of the steel slag powder and the carbon dioxide;
step three, according to water: preparing granulation water according to the standard that the mass ratio of the steel slag powder is 0.4:1, and introducing the granulation water into the granulation environment in the second step in the form of atomized water drops at the speed of 80mL/min to form a steel slag powder-carbon dioxide-water blending environment;
fourthly, operating granulation equipment in the blending environment of the steel slag powder, the carbon dioxide and the water in the third step to obtain an artificial aggregate blank;
and step five, placing the artificial aggregate blank obtained in the step four in an environment with the temperature of 20 ℃, the relative humidity of 70% and the carbon dioxide concentration of 20% for subsequent curing for 4d to obtain the artificial lightweight aggregate.
The obtained aggregate has particle size of 1.18-9.5 mm, porosity of 49%, and bulk density of 712kg/m3。
Example 3
The green energy-saving artificial lightweight aggregate and the preparation method thereof of the embodiment specifically comprise the following steps:
step one, using finely ground converter steel slag powder with the average particle size of 20 microns as a main raw material for preparing aggregate, simultaneously adding waste concrete powder with the mass fraction of 10% of the steel slag powder as an auxiliary material, and uniformly mixing to form mixed powder;
putting the mixture obtained in the step one into granulation equipment, and introducing carbon dioxide gas until the concentration of the carbon dioxide in the granulation equipment reaches 90% to form a gas-solid blending environment of mixed powder-carbon dioxide;
step three, according to water: preparing granulation water according to the standard that the mass ratio of the mixed powder is 0.5:1, and introducing the granulation water into the granulation environment of the step two in the form of atomized water beads at the speed of 70mL/min to form a mixed powder-carbon dioxide-water blending environment;
fourthly, operating granulation equipment in the blending environment of the steel slag powder, the carbon dioxide and the water in the third step to obtain an artificial aggregate blank;
and step five, placing the artificial aggregate blank obtained in the step four in an environment with the temperature of 20 ℃, the relative humidity of 90% and the carbon dioxide concentration of 100% for subsequent curing for 1d to obtain the artificial lightweight aggregate.
The obtained aggregate has the particle size of 4.75-20 mm, the porosity of 38% and the bulk density of 750kg/m3。
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (6)
1. A preparation method of green energy-saving artificial lightweight aggregate is characterized by comprising the following steps:
step one, using finely ground converter steel slag powder as a raw material for preparing aggregate, and controlling the average particle size of steel slag powder particles to be 1-100 mu m;
step two, putting the steel slag powder in the step one into a granulation device, and introducing carbon dioxide gas until the concentration of the carbon dioxide in the granulation device reaches 20% -100%, so as to form a gas-solid blending environment mainly containing the steel slag powder and the carbon dioxide;
step three, according to water: preparing granulation water according to the standard that the mass ratio of the steel slag powder is 0.2: 1-0.5: 1, and introducing the granulation water into the granulation environment in the second step in the form of atomized water beads at the speed of 50 mL/min-100 mL/min to form a steel slag powder-carbon dioxide-water blending environment;
fourthly, operating granulation equipment in the blending environment of the steel slag powder, the carbon dioxide and the water in the third step to obtain an artificial aggregate blank;
and fifthly, placing the artificial aggregate blank obtained in the fourth step in an environment with the temperature of 20-40 ℃, the relative humidity of 50-95% and the carbon dioxide concentration of 0-100% for subsequent curing for 1-4 d to obtain the artificial lightweight aggregate.
2. The method for preparing green energy-saving artificial lightweight aggregate as claimed in claim 1, wherein: steel slag powder was used as the only solid material.
3. The method for preparing green energy-saving artificial lightweight aggregate as claimed in claim 1, wherein: the particle size of the aggregate is 1.18-20 mm.
4. The method for preparing green energy-saving artificial lightweight aggregate as claimed in claim 1, wherein: the porosity of the aggregate is 20-50%.
5. The method for preparing green energy-saving artificial lightweight aggregate as claimed in claim 1, wherein: the loose bulk density of the aggregate is 500-1000kg/m3。
6. The method for preparing green energy-saving artificial lightweight aggregate as claimed in claim 1, wherein: in the third step, the particle size of the atomized water drops is 1 mu m-1 mm.
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| CN202011103706.2A CN112209647B (en) | 2020-10-15 | 2020-10-15 | Green energy-saving artificial lightweight aggregate and preparation method thereof |
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| CN115259712A (en) * | 2022-08-31 | 2022-11-01 | 霖和气候科技(北京)有限公司 | Preparation method of high-solid waste base-converged carbonized baking-free lightweight aggregate |
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| CN101343155B (en) * | 2008-08-29 | 2011-07-27 | 济南大学 | Regeneration aggregate made of carbonized maintaining castoff |
| JP5569174B2 (en) * | 2010-06-21 | 2014-08-13 | Ｊｆｅスチール株式会社 | Method for recovering iron and phosphorus from steelmaking slag, blast furnace slag fine powder or blast furnace slag cement, and phosphoric acid resource raw material |
| CN106746814B (en) * | 2016-12-16 | 2018-08-21 | 济南大学 | A kind of slag aggregate processing method |
| CN108774041B (en) * | 2018-06-13 | 2020-11-13 | 大连理工大学 | Water permeable brick using artificial carbonized steel slag balls as aggregate and preparation method thereof |
| CN109608150A (en) * | 2019-01-21 | 2019-04-12 | 北京科技大学 | A method of using prepared from steel slag for lightweight carbonization building materials |
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