CN107663040B - Iron tailing sand nanometer micropore thin layer sound absorption material and preparation method thereof - Google Patents
Iron tailing sand nanometer micropore thin layer sound absorption material and preparation method thereof Download PDFInfo
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- CN107663040B CN107663040B CN201710911080.XA CN201710911080A CN107663040B CN 107663040 B CN107663040 B CN 107663040B CN 201710911080 A CN201710911080 A CN 201710911080A CN 107663040 B CN107663040 B CN 107663040B
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
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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
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
- C04B38/0041—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter the particulate matter having preselected particle sizes
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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
Abstract
The invention belongs to the technical field of sound absorption materials, and discloses an iron tailing sand nanometer micropore thin layer sound absorption material and a preparation method thereof, wherein iron tailing sand is washed by water to remove dust, and is screened after being dried; preparing an aqueous solution of the tailing sand particles obtained by screening, adding a polyethylene glycol reagent, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material; introducing into a nano sand mill for milling to obtain nano-scale tailing powder slurry; separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings; and (3) putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot press molding to obtain the tailing sand nano micropore thin layer sound absorbing material. The iron tailing sand nanometer micropore thin layer sound absorption material has excellent comprehensive performance in all aspects; the pore diameter is nano, only a thin layer is needed, the sound absorption can be high, the occupied laying space is small, the bearing is reduced, the preparation process is simple, the pores are communicated, the secondary pollution is avoided, the fire resistance and the flame retardance are realized, and meanwhile, a new way for recycling a large amount of waste iron tailing sand is obtained.
Description
Technical Field
The invention belongs to the technical field of sound absorption materials, and particularly relates to an iron tailing sand nanometer micropore thin layer sound absorption material and a preparation method thereof.
Background
The rapidly developed high-rise building puts higher demands on light weight, high strength and reduced volume occupancy of the partition wall, and therefore, the development of thin and light-weight sound absorption and insulation materials for buildings has become a leading research hotspot in the field of environmental noise control. The sound absorption design requirements in many narrow spaces and cabins also put higher demands on the lightness and thinness of sound absorption materials. The development of novel porous sound absorption materials becomes a trend of sound absorption and noise reduction environment functional material development, and has great significance for improving the volume rate of high-rise building houses and reducing bearing. However, the conventional sound absorbing materials such as the ultra-fine glass fiber wool and the polyurethane foam material require a thick layer (more than 100 mm) to achieve the desired sound absorbing effect, and therefore, occupy a certain space. The research of the porous material relates to a plurality of industries and disciplines, such as mechanics, materials, acoustics and the like, the application of the porous material covers the fields of mechanics, spaceflight, aviation, environment, construction, energy and the like, and the porous material causes the wide discussion and research of scholars at home and abroad in recent years; the aperture of the traditional porous sound absorption material corresponding to high sound absorption coefficient is about 0.8mm, which is because the aperture of the traditional porous material preparation technology is at least stopped at millimeter level.
In summary, the problems of the prior art are as follows: 1. the pore diameter of the existing porous sound absorption material is millimeter level, so that the expected sound absorption effect can be achieved only by needing to be laid thickly (more than 100 mm), certain space is occupied, and the nanometer porous sound absorption material and the preparation technology thereof are not available at home and abroad at present; 2. in order to ensure that the nanometer particle pores required by sound absorption are formed and are fully communicated, the related preparation technology is not reported, and the hardness of the iron tailing sand nanometer particles can just meet the requirements; 3. the large amount of waste iron tailing sand urgently needs more new recycling utilization ways, particularly new material functions are endowed and the technology for improving the technical content is not reported, and the report that the nano micropore sound absorption material for controlling the noise pollution is prepared by nano-sizing iron tailing sand particles is the same as the report that the nano micropore sound absorption material for controlling the noise pollution is prepared by nano-sizing the iron tailing sand particles.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an iron tailing sand nanometer micropore thin layer sound absorption material and a preparation method thereof.
The invention is realized in such a way that a preparation method of the iron tailing sand nanometer micropore thin layer sound absorption material comprises the following steps:
washing iron tailing sand with water to remove ash soil, and screening after air drying to obtain tailing sand particles with the particle size of less than 89 mu m;
step two, preparing an aqueous solution of tailing sand particles obtained by screening according to the proportion of 10-30% of solid content, adding 2-3% of polyethylene glycol reagent into the aqueous solution, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material;
introducing the prepared grinding raw material into a nano sand mill, and grinding for 120 minutes by virtue of high-speed collision, friction and shearing actions generated by zirconium beads and a zirconia ceramic grinding rotor to obtain nano-scale tailing powder slurry;
step four, separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings;
and fifthly, putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot press molding to obtain the tailing sand nano micropore thin layer sound absorption material, wherein the hot press pressure is 0.2-1 MPa, the hot press temperature is 20-60 ℃, and the hot press time is 20-30 minutes.
Further, screening the dried tailing sand particles with the particle size of less than 89 mu m by using a 170-mesh screen; the large particles screened off can be sieved after being reground by means of a ball mill.
Further, the nanoscale in the third step is tailing powder slurry with the particle size of less than 900 nm;
the invention also aims to provide the iron tailing sand nano micropore thin layer sound absorption material prepared by the preparation method of the iron tailing sand nano micropore thin layer sound absorption material.
Another object of the present invention is to provide a sound absorbing structure prepared from the iron tailing sand nano microporous thin layer sound absorbing material.
The invention has the advantages and positive effects that: the pore size of the porous sound absorption material is expanded to a nanometer level from the traditional millimeter level breakthrough, the particle size and the pore diameter are both smaller than 900nm, the thin layer can absorb sound highly, the iron tailing sand nanometer micropore thin layer with the thickness of 10mm can achieve the sound absorption effect (the average sound absorption coefficient is more than 0.4) that the traditional porous material needs the thickness of 100mm, and the occupied space is 1/10 of the traditional porous material or even less. Because the tailing sand is milled by a ball mill, the total energy consumption for preparing the nano particles can be reduced by half. The preparation process is simple and has no secondary pollution because the nano particles are prepared by physical action.
The iron tailing sand nanometer micropore thin layer sound absorption material has excellent comprehensive performance in all aspects; the aperture is nano, only a thin layer (10mm) is needed, the sound absorption can be high (the average sound absorption coefficient is more than 0.4), the occupied space is small (1/10 of the traditional porous material) and the bearing is reduced, the preparation process is simple, the holes are communicated, the secondary pollution is avoided, the fire resistance and the flame retardance are realized, and meanwhile, a new way for recycling the large amount of waste iron tailing sand is obtained.
The invention finds that the pore diameter of the porous material with the spherical pores which are communicated with each other is smaller, the number of the pores contained in unit thickness is larger, and the sound absorption coefficient is higher, so that the nano-scale porous material can absorb sound highly only by a thin layer, and the pore size of the porous sound absorption material is expanded from the traditional millimeter level breakthrough to the nano level, thereby obtaining a new thin layer of high sound absorption material and recycling the iron tailing sand. The design idea basis of selecting the iron tailing sand discarded in the mine as the raw material for preparing the nano particles is as follows: 1. SiO in iron tailing sand2The silicon dioxide nano particles are main components (the mass percentage is about 67 percent), and the silicon dioxide nano particles are hard, so that the full communication and uniformity of nano micropores among the particles can be ensured; 2. the iron tailing sand is crushed by a ball mill in the prior mineral separation process, has the granularity of mainly 0.05-0.25 mm and is in the shape of fine-grain powder sand, so that the energy consumption of subsequent processing can be saved, and the preparation of nano-scale powder slurry by further grinding is facilitated; 3. the iron tailings sand is rich and cheap as a raw material source, and has huge social and environmental benefits when being reused, the tailings sand, coal gangue, fly ash and smelting slag generated in the development and utilization process of mineral resources become industrial solid wastes with the largest discharge amount in China, the quantity of the industrial solid wastes reaches more than 80 hundred million tons, the industrial solid wastes approximately account for 80 percent of the total quantity, and the quantity of the tailings sand discharged every year is increased at the speed of more than 5 hundred million tons; 4. it has no secondary pollution and flame retardancy.
The invention nanocrystallizes iron tailing sand particles and prepares the iron tailing sand particles into the nano microporous sound absorption material, is a brand new way for recycling the iron tailing sand, becomes a new material for controlling noise pollution, and has not been reported at home and abroad. Completely different from the existing iron tailing sand treatment modes (such as tailing sand backfilling, tailing sand brick making, tailing sand microcrystalline glass making and the like). Meanwhile, the nano micropore sound absorption technology and material are not reported.
Drawings
Fig. 1 is a flow chart of a method for preparing a nano microporous thin layer sound absorption material of iron tailing sand according to an embodiment of the invention.
Fig. 2 is a schematic diagram of sound absorption frequency characteristics of a tailing sand nano-microporous thin layer sound absorption material provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following detailed description of the principles of the invention is provided in connection with the accompanying drawings.
As shown in fig. 1, a method for preparing a nano microporous thin layer sound absorption material from iron tailings includes the following steps:
s101: washing iron tailing sand with water to remove dust, airing, and screening with a 170-mesh screen to obtain tailing sand particles with the particle size of less than 89 mu m; the screened large particles can be screened after being reground by a ball mill;
s102: preparing an aqueous solution of tailing sand particles obtained by screening according to the proportion of 10-30% of solid content, adding 2-3% of polyethylene glycol reagent (LR grade) into the aqueous solution, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material;
s103: introducing the prepared grinding raw material into a nano sand mill, and grinding for 120 minutes by virtue of high-speed collision, friction and shearing action generated by zirconium beads and a zirconia ceramic grinding rotor to obtain nano-scale (the particle size is less than 900nm) tailing powder slurry;
s104: separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings;
s105: and (3) putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot-press molding to obtain the tailing sand nano micropore thin layer sound absorbing material, wherein the hot-press pressure is 0.2-1 MPa, the hot-press temperature is 20-60 ℃, and the hot-press time is 20-30 minutes.
The application of the principles of the present invention will now be further described with reference to the following examples.
Example 1:
the method comprises the following steps: washing iron tailing sand with water to remove dust, airing, and screening with a 170-mesh screen to obtain tailing sand particles with the particle size of less than 89 mu m; the screened large particles can be screened after being reground by a ball mill;
step two: preparing an aqueous solution of tailing sand particles obtained by screening according to the proportion of 10 percent of solid content, adding 2 percent of polyethylene glycol reagent (LR grade) into the aqueous solution, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material;
step three: introducing the prepared grinding raw material into a nano sand mill, and grinding for 120 minutes by virtue of high-speed collision, friction and shearing action generated by zirconium beads and a zirconia ceramic grinding rotor to obtain nano-scale (the particle size is less than 900nm) tailing powder slurry;
step four: separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings;
step five: and (3) putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot-press molding to obtain the tailing sand nano micropore thin layer sound absorbing material, wherein the hot-press pressure is 0.8MPa, the hot-press temperature is 40 ℃, and the hot-press time is 20 minutes.
Example 2:
the method comprises the following steps: washing iron tailing sand with water to remove dust, airing, and screening with a 170-mesh screen to obtain tailing sand particles with the particle size of less than 89 mu m; the screened large particles can be screened after being reground by a ball mill;
step two: preparing an aqueous solution of tailing sand particles obtained by screening according to the proportion of 20 percent of solid content, adding a 3 percent polyethylene glycol reagent (LR grade) into the aqueous solution, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material;
step three: introducing the prepared grinding raw material into a nano sand mill, and grinding for 120 minutes by virtue of high-speed collision, friction and shearing action generated by zirconium beads and a zirconia ceramic grinding rotor to obtain nano-scale (the particle size is less than 900nm) tailing powder slurry;
step four: separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings;
step five: and (3) putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot-press molding to obtain the tailing sand nano micropore thin layer sound absorbing material, wherein the hot-press pressure is 1MPa, the hot-press temperature is 50 ℃, and the hot-press time is 25 minutes.
Example 3:
the method comprises the following steps: washing iron tailing sand with water to remove dust, airing, and screening with a 170-mesh screen to obtain tailing sand particles with the particle size of less than 89 mu m; the screened large particles can be screened after being reground by a ball mill;
step two: preparing an aqueous solution of tailing sand particles obtained by screening according to the proportion of 30 percent of solid content, adding a 3 percent polyethylene glycol reagent (LR grade) into the aqueous solution, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material;
step three: introducing the prepared grinding raw material into a nano sand mill, and grinding for 120 minutes by virtue of high-speed collision, friction and shearing action generated by zirconium beads and a zirconia ceramic grinding rotor to obtain nano-scale (the particle size is less than 900nm) tailing powder slurry;
step four: separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings;
step five: and (3) putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot-press molding to obtain the tailing sand nano micropore thin layer sound absorbing material, wherein the hot-press pressure is 0.5MPa, the hot-press temperature is 60 ℃, and the hot-press time is 30 minutes.
The three embodiments are tested by an impedance tube method, and the average sound absorption coefficient of the three embodiments can reach more than 0.4.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A preparation method of the iron tailing sand nanometer microporous thin layer sound absorption material is characterized by comprising the following steps of:
washing iron tailing sand with water to remove ash soil, and screening after air drying to obtain tailing sand particles with the particle size of less than 89 mu m;
step two, preparing an aqueous solution of tailing sand particles obtained by screening according to the proportion of 10-30% of solid content, adding 2-3% of polyethylene glycol reagent into the aqueous solution, and uniformly mixing and stirring for 10 minutes to prepare a grinding raw material;
introducing the prepared grinding raw material into a nano sand mill, and grinding for 120 minutes by virtue of high-speed collision, friction and shearing actions generated by zirconium beads and a zirconia ceramic grinding rotor to obtain nano-scale tailing powder slurry;
step four, separating 90% of water in the tailings by using a centrifugal machine to obtain wet powder of the nano tailings;
and fifthly, putting the wet powder of the nano tailing sand into a tabletting mold box, and performing hot press molding to obtain the tailing sand nano micropore thin layer sound absorption material, wherein the hot press pressure is 0.2-1 MPa, the hot press temperature is 20-60 ℃, and the hot press time is 20-30 minutes.
2. The method for preparing the iron tailing sand nano microporous thin layer sound absorption material as claimed in claim 1, wherein the tailing sand particles with the particle size of less than 89 μm are obtained by screening with a 170-mesh screen after being dried in the air in the first step; the large particles screened off can be sieved after being reground by means of a ball mill.
3. The method for preparing the iron tailing sand nano microporous thin layer sound absorption material as claimed in claim 1, wherein the nano-scale in the third step is tailing powder slurry with the particle size of less than 900 nm.
4. An iron tailings sand nano microporous thin layer sound absorbing material prepared by the method for preparing an iron tailings sand nano microporous thin layer sound absorbing material according to claim 1.
5. A sound absorbing structure made from the iron tailings nano microporous thin layer sound absorbing material of claim 4.
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| CN108977927B (en) * | 2018-05-30 | 2021-04-09 | 南昌航空大学 | Nano tailing sand hollow fiber damping material and preparation method thereof |
| CN112500119A (en) * | 2020-12-16 | 2021-03-16 | 江苏必得科技股份有限公司 | Sound absorption material applied to rail transit and preparation method thereof |
| CN114214977A (en) * | 2021-11-15 | 2022-03-22 | 上海彩滨实业发展有限公司 | Painted pottery sand acoustic board and preparation method thereof |
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| CN101373591A (en) * | 2007-08-23 | 2009-02-25 | 中国科学院声学研究所 | Low-frequency sound-absorbing structure of porous material |
| CN106977225A (en) * | 2017-04-18 | 2017-07-25 | 武汉科技大学 | Iron tailing sintered porous material and preparation method thereof |
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| CN101373591A (en) * | 2007-08-23 | 2009-02-25 | 中国科学院声学研究所 | Low-frequency sound-absorbing structure of porous material |
| CN106977225A (en) * | 2017-04-18 | 2017-07-25 | 武汉科技大学 | Iron tailing sintered porous material and preparation method thereof |
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| Title |
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| 高分子微粒吸声材料的声学特性;周洪 等;《高分子材料科学与工程》;20040531;第20卷(第3期);第190-191页 * |
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