CN105819475A - Radiofrequency plasma synthetic method for extracting alumina from aluminum residues - Google Patents
Radiofrequency plasma synthetic method for extracting alumina from aluminum residues Download PDFInfo
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- CN105819475A CN105819475A CN201510006538.8A CN201510006538A CN105819475A CN 105819475 A CN105819475 A CN 105819475A CN 201510006538 A CN201510006538 A CN 201510006538A CN 105819475 A CN105819475 A CN 105819475A
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- aluminum slag
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Abstract
The invention relates to a radiofrequency plasma synthetic method for extracting alumina from aluminum residues. The method is characterized in that a thermal plasma technology is used for constructing a radiofrequency plasma synthesis apparatus as a high-temperature heat source, through processing of the thermal plasma and high temperature purifying of the aluminum residues, thereby the alumina is extracted from the aluminum residues to obtain the alumina ceramic powder, at the same time, the aluminum residues can be processed, alumina is produced, and the aluminum residues can be transited to merchantable products. The radiofrequency plasma synthesis apparatus comprises a powder feeder, a radio frequency generator, a thermal plasma source, a reaction chamber, a powder collection unit and a vacuum pump.
Description
Technical field
The present invention is related to a kind of radiofrequency plasma synthetic method, especially relate to a kind of by the process of thermoelectricity slurry and high temperature purification aluminum slag, from aluminum slag, extract aluminium oxide, to obtain alumina ceramic powder, refer in particular to process aluminum slag simultaneously and produce aluminium oxide, make aluminum slag be converted into the method that can sell product.
Background technology
Typically by reclaiming the flow process reclaiming aluminum in aluminium scrap (Aluminiumscrap), as shown in Figure 6.Molten aluminum (Moltenaluminum) and fine particles (Fineparticle) is generated in the metallurgy of aluminium (Aluminiummetallurgy) period, this molten aluminum casting (Cast) is in a mold to obtain aluminium ingot (Ingot) or alloy (Alloy), and will produce scum silica frost (Dross) with furnace air when molten metal surface reacts；And this fine particles is defined as aluminum slag (Aluminumresidues) by air pollution control system, the dust-collector (Incineratorash) collected such as bag collector, and this scum silica frost and dust-collector.Therefore, in aluminium scrap fusion process, aluminum slag is made up of with aluminium nitride the oxide of aluminium oxide, aluminium alloy and a small amount of addition element.
In TaiWan, China, aluminum regenerative process, the quantity survey of scum silica frost will be more than 200,000 tons/year, and major part aluminum slag is disposed at general cause waste landfill field or illegally saves as main.Owing to general cause waste landfill field and storage area have it to limit at TaiWan, China, and it is the most insufficient with storage area to bury place, and the even handling because of some landfill site is too high, causes and throws aside that to throw out phenomenon without care the most frequent；Therefore, above-mentioned carried be not intended as process aluminum slag optimal solution.It is mainly composed of aluminium oxide (Al due to aluminum slag2O3, account for 75%～92%), remaining is then aluminum (Al), aluminium nitride (AlN) and aluminium carbide (ALC), when aluminum slag contacts with dampness or water, can discharge harmful gas astatically, such as ammonia (NH3), methane (CH4) and hydrogen (H2)；Therefore, aluminum slag is also classified as danger wastes, if being disposed in general cause waste landfill field, then may result in serious problem of environmental pollution, damages ecology.
AlN+3H2O→Al(OH)3+NH3↑pH<8
AlN+4H2O→Al(OH)3+NH4OHpH>8
Al4C3+12H2O→4Al(OH)3+3CH4↑
2Al+2H2O+4OH-→2Al(OH)3+H2↑
It is garbage in view of substantial amounts of aluminum slag can be produced from the removal process producing aluminum or aluminum, the most suitable a kind of recovery technology truly has its needs to aluminum slag, but to so far, any effective technology is not the most found in the process of aluminum slag, therefore, the most user cannot to meet user required when actually used.
Summary of the invention
Present invention is primarily aimed at, overcome the problems referred to above that known skill met with and provide application thermoelectricity slurry technology to build one radiofrequency plasma synthesizer as high temperature heat source, processed and high temperature purification aluminum slag by thermoelectricity slurry, aluminium oxide is extracted from aluminum slag, to obtain alumina ceramic powder, use and reach process aluminum slag simultaneously and produce aluminium oxide, make aluminum slag be converted into the method that can sell product.
Secondary objective of the present invention is, a kind of life cycle increasing secondary resource is provided, it is to avoid the inappropriate process of trade waste and to environmental effects, and the demand of import Main Resources can be reduced, natural resources exploitation is avoided to utilize, and then the method reducing CO2 emissions.
To achieve these objectives, a kind of radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag of the present invention, it is including at least step: (A) provides a radiofrequency plasma synthesizer, and it comprises a powder feeder；One r-f generator, is located in a matching box and is installed on a pedestal, being coupled to an induction coil via a match circuit；One hot plasma source, its one end is connected with this powder feeder, and the other end is arranged on this pedestal, has this induction coil；One reative cell, is connected with this hot plasma source other end；One powder collector unit, is connected with this reative cell；And a vacuum pump, it is connected with this powder collector unit；(B) provide a pending aluminum slag, by this aluminum slag by this powder feeder, enter in this reative cell under carrier gas transmission effect；(C) this reative cell is with this vacuum pump evacuation; by this aluminum slag under vacuum environment; it is passed through protective gas and reacting gas; this r-f generator is used to produce RF energy to this hot plasma source; RF energy is made to produce an alternating electromagnetic field by this induction coil; and a thermoelectricity slurry flame can be formed after maintaining discharge space and reach the process of the thermoelectricity slurry to this aluminum slag and react with high temperature purification, from this aluminum slag, extract aluminium oxide, to obtain alumina ceramic powder；And (D) collects the alumina ceramic powder of the bulky grain discharged, little granule and fine particulate with this powder collector unit.
In the above embodiment of the present invention, this aluminum slag is scum silica frost (Dross) or dust-collector (Incineratorash).
In the above embodiment of the present invention, this r-f generator provides the plasma-based power of 1KW～10MW.
In the above embodiment of the present invention, this r-f generator can produce the radiofrequency plasma of 1MHz～500MHz.
In the above embodiment of the present invention, this hot plasma source can be high frequency plasma-based torch, direct current plasma-based torch or burner.
In the above embodiment of the present invention, the number of turn of this induction coil is 2～6.
In the above embodiment of the present invention, this hot plasma source operates at a temperature of 500 DEG C～5000 DEG C.
In the above embodiment of the present invention, this hot plasma source is mainly made up of a feedstock valve, a quartz ampoule, sleeve and a reaction gas inlet.
In the above embodiment of the present invention, this powder collector unit includes first conduit being connected with this reative cell, second conduit being connected with this first conduit and a chimney filter being connected with this second conduit, makes bulky grain, the little granule alumina ceramic powder with fine particulate respectively via the collection of this first conduit, the second conduit and chimney filter and discharge.
In the above embodiment of the present invention, this chimney filter is provided with a filter screen, makes the alumina ceramic powder of fine granularity be stopped by this filter screen and be discharged by this second conduit.
In the above embodiment of the present invention, this vacuum pump is connected with the chimney filter of this powder collector unit, in order to extract the alumina ceramic powder forming little granule and fine particulate in this reative cell.
In the above embodiment of the present invention, this reacting gas is oxygen, and this carrier gas and protective gas are argon.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of Borolon ceramic powders of the present invention.
Fig. 2 is radiofrequency plasma synthesizer schematic diagram of the present invention.
Fig. 3 is reactor of the present invention-hot plasma source schematic diagram.
Fig. 4 is the present invention grading curve schematic diagram with 3.5KW synthetic powder.
Fig. 5 is the X-ray diffraction schematic diagram of synthetic powder of the present invention.
Fig. 6 is typically by reclaiming the schematic flow sheet reclaiming aluminum in aluminium scrap.
Reference numerals compares:
Powder feeder 1；
R-f generator 2；
Matching box 21；
Pedestal 22；
Match circuit 23；
Hot plasma source 3；
Induction coil 31；
Quartz ampoule 32；
Sleeve pipe 33；
Reaction gas inlet 34；
Reative cell 4；
Powder collector unit 5；
First conduit 51；
First collecting box 511；
Second conduit 52；
Second collecting box 521；
Chimney filter 53；
3rd collecting box 531；
Vacuum pump 6；
Step S11～S14.
Detailed description of the invention
Refer to shown in Fig. 1～Fig. 3, the schematic flow sheet of Borolon ceramic powders the most of the present invention, radiofrequency plasma synthesizer schematic diagram of the present invention and reactor of the present invention-hot plasma source schematic diagram.As shown in the figure: the present invention is a kind of radiofrequency plasma synthetic method, it extracts aluminium oxide (Al in aluminum slag (Aluminumresidues)2O3), it is including at least the following step:
(A) radiofrequency plasma synthesizer S11 is provided: providing a radiofrequency plasma synthesizer, it comprises a powder feeder 1；One r-f generator 2, in being located at a matching box 21 and be installed on a pedestal 22, is coupled to an induction coil 31 via a match circuit 23；One hot plasma source 3, its one end is connected with this powder feeder 1, and the other end is arranged on this pedestal 22, has the induction coil 31 that the number of turn is 2～6；One reative cell 4, is connected with this hot plasma source 3 other end；One powder collector unit 5, is connected with this reative cell 4；And a vacuum pump 6, it is connected with this powder collector unit 5；
(B) aluminum slag charging S12: a pending aluminum slag is provided, by this aluminum slag by this powder feeder 1, entering in this reative cell 4 under the transmission effect of carrier gas, wherein, this aluminum slag is scum silica frost (Dross) or dust-collector (Incineratorash)；
(C) alumina ceramic powder S13: this reative cell 4 is extracted with this vacuum pump 6 evacuation; by this aluminum slag under vacuum environment; it is passed through protective gas and reacting gas; this r-f generator 2 is used to produce RF energy to this hot plasma source 3; RF energy is made to produce an alternating electromagnetic field by this induction coil 31; and a thermoelectricity slurry flame can be formed after maintaining discharge space and reach the process of the thermoelectricity slurry to this aluminum slag and react with high temperature purification; aluminium oxide is extracted, to obtain alumina ceramic powder from this aluminum slag；And
(D) alumina ceramic powder S14 is collected: collect the alumina ceramic powder of the bulky grain discharged, little granule and fine particulate with this powder collector unit.In this way, a brand-new radiofrequency plasma synthetic method is constituted by the flow process of above-mentioned exposure.
Above-mentioned r-f generator 2 can provide the plasma-based power of 1KW～10MW, produces the radiofrequency plasma of 1MHz～500MHz；Above-mentioned powder collector unit 5 is as shown in Figure 2, it includes the second conduit 52 and chimney filter 53 being connected with this second conduit 52 that first conduit 51, being connected with this reative cell 4 is connected with this first conduit 51, this chimney filter 53 is provided with a filter screen (not shown), makes bulky grain, the little granule alumina ceramic powder with fine particulate respectively via this first conduit 51, second conduit 52 and chimney filter 53 collection and discharge；Above-mentioned vacuum pump 6 is connected with this chimney filter 53.
Above-mentioned hot plasma source 3 is as shown in Figure 3, this hot plasma source 3 is mainly made up of a feedstock valve (not shown), a quartz ampoule 32, sleeve 33 and a reaction gas inlet 34, and this hot plasma source 3 can be to utilize RF energy excitation ionizing gas molecules to produce one of the high frequency plasma-based torch of plasma-based stream, direct current plasma-based torch or burner.
The present invention carried radiofrequency plasma synthesizer processes aluminum slag with the capacitance foundation of 1.2 kgs/hour and produces aluminium oxide, and in a specific embodiment, the height of this device is about 2100 millimeters.When using, reative cell 4 is evacuated to about 10 with vacuum pump 6-2Torr ear, r-f generator 2 is used to produce 13.56MHz and RF energy that plasma-based power is 5KW to hot plasma source 3, make radio-frequency current pass through one 6 circle induction coils 31 and produce an alternating electromagnetic field, it has perfect adjustment and loading range, discharge space can be maintained and have good reaction zone, a thermoelectricity slurry flame spraying can be formed at a temperature of 500 DEG C～5000 DEG C in reative cell.Aluminum slag is fed into reative cell 4 via powder feeder 1 with the feed rate of 20 gram/minute with the flow of 300SCCM as carrier gas using argon; it is protective gas that this reative cell 4 is passed through argon; there is provided swirl stabilization with the flow tangential admission of 18SLPM, and when aluminum slag is introduced in thermoelectricity slurry flame axial admission oxygen to provide reacting gas as initiation material.Processed and high temperature purification aluminum slag by thermoelectricity slurry, it is thus achieved that high-purity alpha-alumina ceramic powders.Finally, the bulky grain discharged is collected with powder collector unit 5, little granule and the alumina ceramic powder of fine particulate, wherein, the alumina ceramic powder of large grained can directly fall in the first collecting box 511 via this first conduit 51 under its action of gravity, little granule can extract by this vacuum pump 6 further with the alumina ceramic powder of fine particulate, the alumina ceramic powder making fine granularity is intercepted by filter screen and falls in the second collecting box 521 via this second conduit 52, the alumina ceramic powder of fine particulate is then fallen in the 3rd collecting box 531 via this chimney filter 53 by filter screen.Above are only a preferred embodiment, but be not limited thereto, can adjust accordingly according to reality application.
First, the outward appearance of synthesized aluminium oxide verify.The color of aluminum slag itself is Lycoperdon polymorphum Vitt, and the present invention is using aluminum slag as the fine alumina ceramic powder of the high-purity of raw material production, after inputting according to different capacity (1KW～3.5KW), color is converted to white, and along with power bring up to 3.5KW time, the color of synthesized alumina ceramic powder transfers to pure white.
Refer to shown in Fig. 4, for the present invention with the grading curve schematic diagram of 3.5KW synthetic powder.As shown in the figure: verified by synthesized alumina particle distribution.As a example by the particle diameter of 3.5KW synthetic powder is distributed, in figure, particle diameter accounts for the 10% of all Borolon powder particles less than the granule of 3.0 μm；Particle diameter accounts for the 50% of all Borolon powder particles less than the granule of 8.0 μm；And particle diameter accounts for the 90% of all Borolon powder particles less than the granule of 15.6 μm.And the particle diameter of initiation material aluminum slag, d50With d90Diameter be respectively 22.1 μm and 73.5 μm.Therefore, carry out plasma-based synthesis processing procedure with this device can effectively prepare and obtain Fine Ceramic Powder.It addition, represented by volume distributed median, particle accounts for total sample volume percentage ratio in intended size scope, and when it is close to 100%, cumulative volume curve follows the tracks of the cumulative volume of all size ranges.As it can be seen, d10、d50With d90Being to be given by the value of X-axis (diameter), wherein, cumulative volume curve intersects 10%, 50% and 90% in Y-axis.
Refer to shown in Fig. 5, for the X-ray diffraction schematic diagram of synthetic powder of the present invention.As shown in the figure: colors different in figure represents each input power from 1.0KW to 3.5KW.Through X-ray diffraction (X-RayDiffractometer, XRD) display is analyzed, synthesized powder falls at corundum type structure, and the powder of synthesis only includes that aluminium oxide does not has the aluminum metal of remnants, powder synthesized by proof is aluminium oxide really, and along with power increases, synthetic powder has higher intensity.
Following table one is the main component of synthetic powder.This table shows the chemical composition analysis result with powder synthesized by different capacity, and overall its concentration of aluminium oxide is all higher than 95%, and especially when 3.5KW, the concentration of aluminium oxide is 99.95%.
Table one
| 1.0KW | 1.5KW | 2.0KW | 2.5KW | 3.0KW | 3.5KW | |
| Al2O3 | 95.86 | 96.68 | 95.98 | 98.69 | 99.77 | 99.95 |
| K2O | 1.69 | 1.77 | 1.58 | - | - | - |
| CaO | 1 | 0.63 | 0.97 | - | - | - |
| TiO2 | 0.23 | 0.25 | 0.54 | 0.63 | 0.1 | 0.01 |
| Fe2O3 | 1.22 | 0.67 | 0.93 | 0.68 | 0.13 | 0.04 |
Present invention application thermoelectricity slurry technology builds a kind of radiofrequency plasma synthesizer as high temperature heat source, processed and high temperature purification aluminum slag by thermoelectricity slurry, aluminium oxide is extracted from aluminum slag, to obtain alumina ceramic powder, use and reach process aluminum slag simultaneously and produce aluminium oxide, make aluminum slag be converted into vendible product.Therefore, by institute's extracting method of the present invention and device, the life cycle of secondary resource can be increased, and avoid the inappropriate process of trade waste and to environmental effects, and the demand of import Main Resources can be reduced, it is to avoid natural resources exploitation utilizes, and then reduces the discharge capacity of carbon dioxide.
In sum, the present invention is a kind of radiofrequency plasma synthetic method, can be effectively improved various shortcoming, is processed and high temperature purification aluminum slag by thermoelectricity slurry, extracts aluminium oxide (Al from aluminum slag2O3), to obtain alumina ceramic powder, use and reach process aluminum slag simultaneously and produce aluminium oxide, make aluminum slag be converted into and can sell product, and then make the generation of the present invention can more progressive, more practical, more meet user institute palpus, and indeed meeting application for a patent for invention important document, whence proposes patent application in accordance with the law.
But the above, only present pre-ferred embodiments, when not limiting the scope of the present invention with this；Therefore, all simple equivalence changes made according to claims of the present invention and description and modification, all should still belong in patent covering scope of the present invention.
Claims (10)
1. the radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag, it is characterised in that including at least the following step:
(A) providing a radiofrequency plasma synthesizer, it comprises a powder feeder；One r-f generator, is located in a matching box and is installed on a pedestal, being coupled to an induction coil via a match circuit；One hot plasma source, its one end is connected with this powder feeder, and the other end is arranged on this pedestal, has this induction coil；One reative cell, is connected with this hot plasma source other end；One powder collector unit, is connected with this reative cell；And a vacuum pump, it is connected with this powder collector unit；
(B) provide a pending aluminum slag, by this aluminum slag by this powder feeder, enter in this reative cell under carrier gas transmission effect；
(C) this reative cell is with this vacuum pump evacuation; by this aluminum slag under vacuum environment; it is passed through protective gas and reacting gas; this r-f generator is used to produce RF energy to this hot plasma source; RF energy is made to produce an alternating electromagnetic field by this induction coil; and after maintaining discharge space, form a thermoelectricity slurry flame and reach the process of the thermoelectricity slurry to this aluminum slag and react with high temperature purification, from this aluminum slag, extract aluminium oxide, to obtain alumina ceramic powder；And
(D) alumina ceramic powder of the bulky grain discharged, little granule and fine particulate is collected with this powder collector unit.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterised in that this aluminum slag is scum silica frost or dust-collector.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterised in that this r-f generator provides the plasma-based power of 1KW～10MW.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterized in that, this vacuum pump is connected with the chimney filter of this powder collector unit, in order to extract the alumina ceramic powder forming little granule and fine particulate in this reative cell.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterised in that this hot plasma source is high frequency plasma-based torch, direct current plasma-based torch or burner.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterised in that this reacting gas is oxygen, this carrier gas and protective gas are argon.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterised in that this hot plasma source operates at a temperature of 500 DEG C～5000 DEG C.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterised in that this hot plasma source is mainly made up of a feedstock valve, a quartz ampoule, sleeve and a reaction gas inlet.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 1, it is characterized in that, this powder collector unit includes first conduit being connected with this reative cell, second conduit being connected with this first conduit and a chimney filter being connected with this second conduit, makes bulky grain, the little granule alumina ceramic powder with fine particulate respectively via the collection of this first conduit, the second conduit and chimney filter and discharge.
The radiofrequency plasma synthetic method extracting aluminium oxide in aluminum slag the most according to claim 9, it is characterised in that be provided with a filter screen in this chimney filter, makes the alumina ceramic powder of fine granularity be stopped by this filter screen and be discharged by this second conduit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112516954A (en) * | 2020-11-27 | 2021-03-19 | 常熟理工学院 | Method for preparing nano aluminum-based adsorption material by using aluminum slag |
| WO2022095264A1 (en) * | 2020-11-06 | 2022-05-12 | 太原理工大学 | Bauxite organic matter removal method and device |
| CN115446071A (en) * | 2021-06-09 | 2022-12-09 | 蒋世杰 | Method for recovering overhaul slag ash |
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| US6261484B1 (en) * | 2000-08-11 | 2001-07-17 | The Regents Of The University Of California | Method for producing ceramic particles and agglomerates |
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| US6261484B1 (en) * | 2000-08-11 | 2001-07-17 | The Regents Of The University Of California | Method for producing ceramic particles and agglomerates |
| CN103964709A (en) * | 2013-02-06 | 2014-08-06 | 嘉颉金属股份有限公司 | Recycling method for baghouse aluminum dust and aluminum metal smelting slag |
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| SHENG-FU YANG ET AL.: "Fine Al2O3 Powder Produced by Radio-Frequency Plasma From Aluminum Dross", 《IEEE TRANSACTIONS ON PLASMA SCIENCE》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095264A1 (en) * | 2020-11-06 | 2022-05-12 | 太原理工大学 | Bauxite organic matter removal method and device |
| CN112516954A (en) * | 2020-11-27 | 2021-03-19 | 常熟理工学院 | Method for preparing nano aluminum-based adsorption material by using aluminum slag |
| CN112516954B (en) * | 2020-11-27 | 2023-04-21 | 常熟理工学院 | Method for preparing nano aluminum-based adsorption material by utilizing aluminum slag |
| CN115446071A (en) * | 2021-06-09 | 2022-12-09 | 蒋世杰 | Method for recovering overhaul slag ash |
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