CN104310787A - Preparation method of fly ash artificial hollow floating beads - Google Patents
Preparation method of fly ash artificial hollow floating beads Download PDFInfo
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- CN104310787A CN104310787A CN201410508504.4A CN201410508504A CN104310787A CN 104310787 A CN104310787 A CN 104310787A CN 201410508504 A CN201410508504 A CN 201410508504A CN 104310787 A CN104310787 A CN 104310787A
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Abstract
The invention relates to a preparation method of fly ash artificial hollow floating beads, which comprises the following steps: mixing fly ash powder with water, a stabilizer and a foaming agent, and carrying out ball milling to obtain a high-solid-content fly ash slurry; adding the fly ash slurry into a spray granulating apparatus, atomizing to form spherical slurry liquid drops, spraying into a forming chamber, and quickly dehydrating and drying to form the spherical powder coal ash precursor; making the spherical powder coal ash precursor into hollow spheres by a bead forming furnace; and collecting the heating product by the bead forming furnace, and separating out the hollow floating beads by a floatation process. By preparing the hollow floating beads mainly from the fly ash by a spray granulating process, the preparation method can solve the problem of shortage of natural hollow floating beads in the market, can also solve the problems of piling and pollution of waste in coal plants, reutilizes the resources, and can create huge economic benefit and social benefit.
Description
Technical field
The present invention relates to light-weight inorganic filler, i.e. hollow float bead, this filler is widely used in the fields such as Cementing, chemical industry, shipbuilding, space flight and aviation, radiotelegraphy, is especially useful in Cementing and alleviates additive for light weight cement.
Background technology
Hollow float bead is a kind of Powdered Ultralight ceramic of micron order ball of hollow, because of excellent performance, be described as " king of matrix material ", " space material of New Times ", " magic powder ", it is the main flow kind of 21st century high end composites, be particularly developed country's new type functional industrial filler of being used widely in the whole world in the last few years, have that quality is light, intensity is high, heat-insulation and heat-preservation, good fluidity, many uniquenesses such as corrosion-resistant feature.Thus the field such as widespread use Cementing, aerospace, machinery, physics, chemistry, electrical isolation and military affairs.Within 1973, in pittsburgh,U.S.A international lime-ash meeting, bit doctor Hua (Beclow) discusses the possibility extracting hollow float bead from flyash, and its premium properties.
The U.S. flies Lyntech Corporation (US) 10177 South 77th East Avenue Tulsa, Oklahoma 74133 U.S. and just sets about development powder coal ash hollow float bead thus, and commercially sells with the form of commodity.Because abundant raw material, turn waste into wealth, the advantage such as cheap, become best-selling product.China's hollow float bead development is substantially from late nineteen seventies, for promoting the development of hollow float bead, file (such as " state's economy and trade money [1996] 809 " file) encourage growth hollow float bead was once repeatedly assigned by country, and gave preferential policy.Some producers producing hollow float bead are also born in succession.Especially in recent years, further enhancing hollow float bead is familiar with along with people and the develop rapidly of modern industry, the continuous enhancing of people's environmental consciousness, the investigation and application of fly ash hollow drift pearl just more and more causes attracting attention of common people, this imply that hollow float bead has wide future in field of compound material from now on.
Hollow float bead major part used in the market extracts hollow float bead from the flyash after the burning of fuel-burning power plant.But the content of hollow float bead is less than 1% of flyash; Add again the state that thermal power plant is on the rise to ecological environmental pollution, country increases renovation dynamics, has closed down most of thermal power plant that environment is not up to standard, so the source of natural hollow float bead is fewer and feweri, but the market requirement is very powerful.In addition, China is due to coal-burning power plant's generating within significant period of time, and have accumulated more than one hundred million tons of flyash, therefore the process of flyash and recycling problem receive the concern of entire society, also become the vital task that China and even the whole world face.
Summary of the invention
The object of the invention is the process and the recycling problem that solve flyash, prepares artificial hollow float bead.
In order to reach above-mentioned purpose, the invention provides the preparation method of a kind of flyash artificial hollow drift pearl, comprising the following steps: flyash powder being mixed with water, stablizer, whipping agent and ball milling, prepare the flyash slurry of high solid loading; Described flyash slurry is added in Spray granulation equipment, makes it be atomized and form spherical slurry drop, and spray in forming room, make its drying of drying out fast, form spherical powder coal ash presoma; Described spherical powder coal ash presoma is passed through into the hollow nodularization of pearl stove; And heat the product-collecting obtained get off passing through into pearl stove, then isolate hollow float bead by floating method.
In some embodiments, the mean density 0.6 ~ 0.7g/cm of hollow float bead prepared by the method
3, intensity is 20 ~ 30MPa, and particle diameter is 10 μm-300 μm.
In some embodiments, after ball milling, described flyash size controls be less than 2 μm, and slurry solid content is greater than 30%.
In some embodiments, described stablizer is polyvinyl alcohol, polyoxyethylene, methylcellulose gum, the water-soluble high-molecular materials such as carboxymethyl cellulose, and consumption controls within 1% of slurry gross weight.
In some embodiments, described whipping agent be inorganic or organic water soluble material as ammonium sulfate, urea, sodium carbonate, Triton, gallic acid third lipoprotein, water soluble starch etc. one or more, within its content controls 2% of flyash weight in the slurry.
In some embodiments, the temperature of mist projection granulating controls at 200-300 DEG C, and granulation particle size range is between 5-100 μm.
In some embodiments, hollow nodularization temperature is 1000 DEG C ~ 1400 DEG C.
Preparation method of the present invention adopts flyash to be main raw material, Spray granulation method is utilized to prepare hollow float bead, not only can solve natural hollow float bead market short supply state, and stacking and the pollution problem of coal fired plant waste can also be solved, resource is recycled, huge economic interests and social benefit will be createed.
Below in conjunction with accompanying drawing, the description of purport of the present invention is described by example, to know other aspects of the present invention and advantage.
Accompanying drawing explanation
By reference to the accompanying drawings, by detailed description hereafter, above-mentioned and other feature and advantage of the present invention more clearly can be understood, wherein:
Fig. 1 is the schema of the preparation method according to the embodiment of the present invention;
Fig. 2 is class spherical precursor powder light micrograph;
Fig. 3 a is thermal power plant's fly ash hollow drift bead optical Photomicrograph; And
Fig. 3 b is artificial hollow of the present invention drift bead optical Photomicrograph.
Embodiment
See the accompanying drawing of the specific embodiment of the invention, hereafter in more detail the present invention will be described.But the present invention can realize in many different forms, and should not be construed as by the restriction in the embodiment of this proposition.On the contrary, it is abundant and complete open in order to reach for proposing these embodiments, and makes those skilled in the art understand scope of the present invention completely.
First describe the preparation method according to the embodiment of the present invention in detail with reference to accompanying drawing.
Fig. 1 shows the schema of the preparation method according to the embodiment of the present invention.
As described in Figure 1, preparation method's step of a kind of flyash artificial hollow drift pearl of the present invention comprises following four steps:
Step one, mixing and ball milling: mixed with water, stablizer, whipping agent by flyash powder and ball milling, after ball milling, flyash size controls within 2 μm, and its solid content of flyash slurry preparing high solid loading controls at 30-60%.
Carrying out mixing and ball milling, first needing flyash crushing and grinding, to form flyash powder.In addition, after mixing and ball milling, can will leave in pulp storing tank and stablize by flyash slurry.
Step 2, mist projection granulating: add in Spray granulation equipment by stable flyash slurry, makes it be atomized and forms spherical slurry drop, and spray in forming room, make its drying of drying out fast, forms spherical powder coal ash presoma.Its mist projection granulating should select granulation outcome centrifugal or press atomization tablets press preferably, and the inlet temperature of sponging granulator controls at 200-300 DEG C, and granulation particle size range is between 5-100 μm, and optimum particle size range is at 20-50 μm.
Step 3, hollow nodularization: spherical precursor powder good for mist projection granulating is put into feed hopper, and opening for feed is located at burner base, enters quirk by feeding-passage and state of combustion air-flow converges, and combustion gas is sprayed by nozzle by blast tube.The flow direction of spherical precursor powder is consistent with the flow direction of combustion gas flowing, flyash presoma powder in burned flame after melting under the effect of end induced draft fan, can only also cool rapidly by vertical upflow, thus avoid the microballon of melting and furnace wall or other devices to collide, thus improve the bead yield rate of microballon, the temperature of balling furnace is 1000 DEG C ~ 1400 DEG C;
Step 4, collects sorting: heat the product-collecting obtained get off passing through into pearl stove, then isolate hollow float bead by floating method, bead floating device can select gravity settling floating method to carry out dry separation, and also used water is as the liquid float method of floating medium.
Mean density 0.6 ~ the 0.7g/cm3 of the hollow float bead prepared by present method, intensity is 20 ~ 30MPa, and particle diameter is 10 μm-300 μm.
Refer now to Fig. 2 and 3, describe the embodiment of method produced according to the present invention in detail.
Embodiment:
The first step stable and uniform slurry configures: by flyash 20kg, add water 20kg, 500g sodium carbonate, 100g ammonium sulfate and 200g methylcellulose gum are mixed with water slurry liquid material, then under 3 normal temperature and normal pressure, adopt high speed ball mill to be mixed by its abundant ball milling, in ball milling disposed slurry, solid particulate controls be not more than 2 microns, and its solid content is 50%.
Second step micron order class spherical precursor preparation: the slurries the homogenized the first step obtained are transported in atomizer moisture eliminator, feeding amount is 100kg/h, drying temperature is 250 DEG C, obtains the spherical precursor powder of class of 20 ~ 80 microns as shown in Figure 2.
The preparation of the 3rd step hollow float bead: the micron order class spherical precursor powder of gained in second step is entered one with the speed of 8kg/h and is specifically designed in microballon balling furnace and carries out hollow nodularization, nodularization temperature controls within the scope of 1200 DEG C ~ 1300 DEG C, the nodularization time is 0.3 second, through hollow nodularization powder through collector collect after, hollow float bead is sub-elected by floating method, the pattern of the hollow float bead sub-elected is as Fig. 3 b, Fig. 3 a is thermal power plant's fly ash hollow drift pearl photo, the particle diameter of hollow float bead concentrates between 30 ~ 150 μm substantially, its floatability is 98%, density is 0.68g/cm
3, it is 28MPa that by volume calculating crushing accounts for volume 20% hollow float bead crushing strength, and thermal power plant's fly ash hollow drift pearl crushing strength is generally at about 20MPa.
Preparation method of the present invention adopts flyash to be main raw material, Spray granulation method is utilized to prepare hollow float bead, not only can solve natural hollow float bead market short supply state, and stacking and the pollution problem of coal fired plant waste can also be solved, resource is recycled, huge economic interests and social benefit will be createed.
More than describe preferred embodiment of the present invention in detail.Should be appreciated that those of ordinary skill in the art just design according to the present invention can make many modifications and variations without the need to creative work.All technician in the art, all should by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (7)
1. a preparation method for flyash artificial hollow drift pearl, is characterized in that, comprise the following steps:
A flyash powder mixes with water, stablizer, whipping agent and ball milling by (), prepare the flyash slurry of high solid loading;
B described flyash slurry adds in Spray granulation equipment by (), make it be atomized and form spherical slurry drop, and spray in forming room, make its drying of drying out fast, forms spherical powder coal ash presoma;
C described spherical powder coal ash presoma is passed through into the hollow nodularization of pearl stove by (); And
D () is heated the product-collecting obtained get off being passed through into pearl stove, then isolate hollow float bead by floating method.
2. preparation method as claimed in claim 1, is characterized in that, the mean density 0.6 ~ 0.7g/cm of hollow float bead prepared by the method
3, intensity is 20 ~ 30MPa, and particle diameter is 10 μm-300 μm.
3. preparation method as claimed in claim 2, it is characterized in that, after ball milling, described flyash size controls be less than 2 μm, and slurry solid content is greater than 30%.
4. preparation method as claimed in claim 1, it is characterized in that, described stablizer is polyvinyl alcohol, polyoxyethylene, methylcellulose gum, the water-soluble high-molecular materials such as carboxymethyl cellulose, and consumption controls within 1% of slurry gross weight.
5. the preparation method according to claim 1, it is characterized in that, described whipping agent be inorganic or organic water soluble material as ammonium sulfate, urea, sodium carbonate, Triton, gallic acid third lipoprotein, water soluble starch etc. one or more, within its content controls 2% of flyash weight in the slurry.
6. the preparation method according to claim 1, is characterized in that, the temperature of mist projection granulating controls at 200-300 DEG C, and granulation particle size range is between 5-100 μm.
7. the preparation method according to claim 1, is characterized in that, hollow nodularization temperature is 1000 DEG C ~ 1400 DEG C.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271647A (en) * | 2015-11-05 | 2016-01-27 | 中国建材国际工程集团有限公司 | Method for preparing hollow glass beads through waste glass |
| CN106810087A (en) * | 2015-11-30 | 2017-06-09 | 北京有色金属研究总院 | A kind of process of surface treatment of coal fly ash hollow micro bead |
| CN106830982A (en) * | 2017-03-21 | 2017-06-13 | 兰州理工大学 | A kind of method for preparing hollow ceramic microspheres |
| CN107556029A (en) * | 2017-10-12 | 2018-01-09 | 郑承德 | A kind of cenosphere and preparation method thereof |
| CN113735644A (en) * | 2021-09-14 | 2021-12-03 | 黑龙江省世纪云天国际贸易有限公司 | Special lodging-resistant fertilizer for rice for improving root system activity and preparation method thereof |
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| US4677022A (en) * | 1986-01-24 | 1987-06-30 | Potters, Industries, Inc. | Process for making lightweight body suitable for use as an additive in an article of manufacture, such lightweight body itself, and composite containing same |
| CN1736912A (en) * | 2005-07-11 | 2006-02-22 | 张伟 | Hollow microbead preparation method |
| US20080096018A1 (en) * | 2005-12-08 | 2008-04-24 | James Hardie International Finance B.V. | Engineered low-density heterogeneous microparticles and methods and formulations for producing the microparticles |
| CN101870588A (en) * | 2009-04-21 | 2010-10-27 | 河北勇龙邦大新材料有限公司 | Method and device for preparing hollow ceramic microspheres |
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2014
- 2014-09-28 CN CN201410508504.4A patent/CN104310787A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4677022A (en) * | 1986-01-24 | 1987-06-30 | Potters, Industries, Inc. | Process for making lightweight body suitable for use as an additive in an article of manufacture, such lightweight body itself, and composite containing same |
| CN1736912A (en) * | 2005-07-11 | 2006-02-22 | 张伟 | Hollow microbead preparation method |
| US20080096018A1 (en) * | 2005-12-08 | 2008-04-24 | James Hardie International Finance B.V. | Engineered low-density heterogeneous microparticles and methods and formulations for producing the microparticles |
| CN101870588A (en) * | 2009-04-21 | 2010-10-27 | 河北勇龙邦大新材料有限公司 | Method and device for preparing hollow ceramic microspheres |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271647A (en) * | 2015-11-05 | 2016-01-27 | 中国建材国际工程集团有限公司 | Method for preparing hollow glass beads through waste glass |
| CN106810087A (en) * | 2015-11-30 | 2017-06-09 | 北京有色金属研究总院 | A kind of process of surface treatment of coal fly ash hollow micro bead |
| CN106830982A (en) * | 2017-03-21 | 2017-06-13 | 兰州理工大学 | A kind of method for preparing hollow ceramic microspheres |
| CN106830982B (en) * | 2017-03-21 | 2020-04-17 | 兰州理工大学 | Method for preparing hollow ceramic microspheres |
| CN107556029A (en) * | 2017-10-12 | 2018-01-09 | 郑承德 | A kind of cenosphere and preparation method thereof |
| CN113735644A (en) * | 2021-09-14 | 2021-12-03 | 黑龙江省世纪云天国际贸易有限公司 | Special lodging-resistant fertilizer for rice for improving root system activity and preparation method thereof |
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Application publication date: 20150128 |