CN105290412A - Atomizing method and device for preparing superfine near-spherical low-oxygen metal powder - Google Patents
Atomizing method and device for preparing superfine near-spherical low-oxygen metal powder Download PDFInfo
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Abstract
The invention discloses an atomizing method and device for preparing superfine near-spherical low-oxygen metal powder. The method includes the step that molten metal liquid flow is broken into liquid drops through high-pressure gas; the liquid drops are broken multiple times through high-pressure water to form finer liquid drops and contract to be in a near-spherical shape in an atomizing cylinder in the flying process; and finally, the liquid drops are solidified to be the superfine near-spherical low-oxygen metal powder. According to the device, compared with traditional gas atomization, the breaking function of high-pressure water is added, and powder is finer in size; due to the fact that the breaking effect of gas is added, the amount of atomizing water is greatly reduced, the contracting process of powder is prolonged, and the degree of sphericility is better than that in traditional water atomization; and in addition, the whole atomization process is conducted in inert protective gas, and therefore the oxygen content of powder is reduced. Furthermore, the technology is advanced and reliable, the technology device is simple, continuity is high, production cost is low, product performance is stable, and the atomizing method and device are suitable for industrial production and can be widely applied to the metal injection molding industry.
Description
Technical field
The present invention relates to metal powder material preparing technical field, specifically relate to a kind of atomization method and the equipment of preparing ultra-fine subsphaeroidal hypoxemia metal dust, prepared powder is suitable for metal injection moulding and uses.
Background technology
Metal powder material is generally by the preparation of reducing process, mechanical crushing method, electrolysis and atomization method, wherein atomization due to production capacity large, uniform composition, applied range and become the major way of powder production.Atomization is smashed into droplet by air-flow at a high speed or current by from leaking the molten metal bath stream flowed out in eye and in flight course, be cooled to the method for metal dust, and the former is referred to as aerosolization method, and the latter is referred to as water atomization.
The powder that aerosolization method is produced generally has that good sphericity, oxygen content are low, tap density high, is suitable for Ti, the production of the easy oxidation metals such as Al and alloy powder.But there is certain difficulty, because low as the inert gas energy of atomizing medium in aerosolization in preparation superfines.In addition the cost of inert gas is relatively high, causes gas-atomised powders expensive.
The powder that water atomization is produced generally has the features such as pattern is irregular, fine size, tap density are low, and the steam produced in atomization process easily and metal reaction, causes the oxygen content of water atomized powder higher.But because the kinetic energy of water under high pressure is large, water atomization is suitable for producing lemel in enormous quantities.
Along with the development of metal injection moulding, for ultra-fine (referring generally to meso-position radius D50 < 10 μm), subsphaeroidal (General Requirements tap density > 4.5g/cm3), the metal dust demand of low oxygen content (General Requirements oxygen content is lower than 5000ppm) constantly increases.
The technical process of metal injection moulding be first by metal dust and high-molecular organic material such as various wax and thermoplastic resin through mixing formation feeding, feeding is shaped in a mold by injection machine, finally removes bonding agent, sinters required goods into.Powder morphology is subsphaeroidal, can increase the mobility of feeding in injection moulding process.Tap density is the one reflection of powder morphology, when tap density height, can think that the mobility of feeding can be better.In order to the dimensional accuracy of the mobility and goods that ensure feeding, in injection moulding, the volume of bonding agent is generally 35%-50%.Because bonding agent will be removed totally in final link, therefore the size of goods will be shunk.Remove time consideration for dimensional accuracy and bonding agent, the content of bonding agent is more few better.In order to ensure that the mobility of feeding then requires that the tap density of powder is high.
Because thin powder contact point in sintering process is more, can obtain high sintered density, the powder size that therefore injection moulding is used is comparatively thin, and general D50 < 10 μm is suitable.
The oxygen content of powder is difficult to removing in sintering process, can form being mingled with of nonmetallic phase in goods, and therefore the oxygen content in power needs of injection moulding are more low better.
Aerosolization method can obtain the subsphaeroidal of appropriate injection shaping use, low oxygen content powder, but its fine powder recovery rate is few, causes cost increase.Water atomization can be mass-produced inexpensive metal powder, but due to pattern irregular, the requirement of feeding mobility can only be reached by the ratio increasing bonding agent.Both all limits the development of metal injection moulding.
The patent No. is that the Chinese patent of ZL99254400.9 discloses a kind of high-pressure water atomized powder making device, and this device uses 60MPa water under high pressure to be atomized, and the powder of gained is cerioid and irregularly shaped, is applied in injection moulding the mobility being unfavorable for feeding.The patent No. is that the Chinese patent of ZL201320565703.X discloses a kind of powder metallurgy high-pressure water atomized powder making device, by adding the second atomizer, the low-pressure inert gas ejected from second nozzle-neon is to reduce the oxidation of metal and alloy, reduce the oxygen content of powder, and atomization hydraulic pressure used is only 10-12MPa, the powder of preparation, cannot obtain sufficient superfines.The patent No. is that the Chinese patent of ZL201220006798.7 discloses a kind of high efficient gas and liquid two layers flow water atomization pulverization nozzle, be that the gas that nozzle internal layer passes into certain pressure forms ring-like laminar flow air film, this ring-like laminar flow air film surrounds liquid fluidization tower, make it not by ambient gas disturbance,-325 obtained order powder are 65%, for partially thick injection moulding, impact uses.Application number is the preparation method that the Chinese invention patent application of 201310304846.X discloses a kind of minute spherical powder of stainless steel, by setting up stable argon plasma, regulate plasma parameter, thus the irregular stainless steel powder raw material of water atomization is heated, be separated after cooling curing and obtain minute spherical powder of stainless steel, but such a process increases last handling process, cost significantly rises.Application number be 201110323793.7 Chinese invention patent application disclose the atomization of a kind of high-pressure water and prepare the method for low oxygen content fine diamond goods pre-alloyed powder, but the method is mainly for diamond matrix powder.
Summary of the invention
For the problems referred to above, the invention provides that a kind of preparation technology is reasonable, continuity is strong, production cost is low, and properties of product are stablized, and is suitable for atomization method and the equipment of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation of suitability for industrialized production.
To achieve the above object of the invention, the present invention prepares the atomization method of ultra-fine subsphaeroidal hypoxemia metal dust, said method comprising the steps of:
Raw material metal is put into intermediate frequency furnace melting by S1, and uses double deoxidizer deoxidation to remove the gred;
The molten metal of melting is toppled in the atomization bottom pour ladle of atomization plant by S2, and the leakage eye under the suction function that molten metal produces at gravity and high pressure draught, High-Pressure Water bottom bottom pour ladle is to subscribe flow velocity inflow nebulization region;
Metal liquid stream described in S3 becomes molten drop under the atomizing of gases at high pressure, and molten drop is formed as fine droplets by the fragmentation of repeatedly water under high pressure;
Fine droplets described in S4 is subsphaeroidal along being constantly shrunk in atomizing cup dropping process, falls into atomizing cup bottom water and cools;
S5 is separated cooling the powder obtained by pigment, and loads vacuum drier, carries out drying.
Particularly, described double deoxidizer is calcium-silicon, calcium silicomangan and/or pure silicon.
Preferably, in described step S1 in raw material metal fusion process, the degree of superheat of metal is 100 ~ 200 DEG C.
Preferably, in described step S2, molten metal flows into the reservation flow velocity of nebulization region is 8 ~ 20kg/min.
Preferably, described gases at high pressure are inert gas, and the pressure of described gases at high pressure is 0.2 ~ 0.6MPa, and the flow of described gases at high pressure is 1 ~ 3m3/min.
Preferably, the pressure of described water under high pressure is 80 ~ 120MPa, and the flow of described water under high pressure is 35 ~ 75L/mim.
Further, the water level in described atomization cylindrical shell is controlled by Pulp pump, and in described atomization cylindrical shell, the distance of the cooling water surface is put in atomization is bottom 3 ~ 5m.
To achieve the above object of the invention, the present invention prepares the atomization plant of ultra-fine subsphaeroidal hypoxemia metal dust, this equipment is used in the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of above-mentioned preparation, described equipment comprises atomization bottom pour ladle 1, be arranged on the gases at high pressure atomization spray dish 2 on atomization bottom pour ladle 1 bottom surface, be arranged on gases at high pressure atomization spray and coil hydraulic atomized spray dish 3 on 2 bottom surfaces, be arranged on the powder collecting pot 5 that hydraulic atomized spray is coiled the atomizing cup 4 on 3 bottom surfaces and is positioned at below atomizing cup 4, wherein said gases at high pressure atomization spray dish 2, a passage be interconnected 6 is provided with in hydraulic atomized spray dish 3 and atomizing cup 4, nebulization region is formed in this passage 6, and this passage 6 is connected with the leakage eye arranged bottom atomization bottom pour ladle 1, described gases at high pressure atomization spray dish 2 is provided with ring-crack ventilation gases at high pressure nozzle 21, described hydraulic atomized spray dish 3 is circumferentially placed with at least two group hydraulic sprays, often organize hydraulic spray to comprise two respectively and coil the symmetrically arranged hydraulic spray 7 of 3 central shaft along hydraulic atomized spray, the water that each hydraulic spray 7 sprays is fan-shaped arrangement.
Further, the circumferential weld width L of described ring-crack ventilation gases at high pressure nozzle 21 is 1 ~ 5mm, and angle ω is 45 ~ 75 °.
Further, the diameter d of described each high pressure water atomization nozzle is 0.5 ~ 1.0mm, angle ψ between two high pressure water atomization nozzles that position is corresponding is 25 ~ 65 °, and the water under high pressure being positioned at ejection on same high-pressure water nozzle 7 is covering of the fan distribution, and covering of the fan included angle is 5 ~ 35 °.
beneficial effect:
Compared with existing correlation technique, the present invention has following beneficial effect:
The metal liquid stream of melting is first broken into drop by gases at high pressure owing to have employed by the present invention, drop forms more tiny drop through the multiple fragmentation of water under high pressure again, and be shrunk to subsphaeroidal in the process of flying in atomizing cup, finally solidify out into the atomization method of powder, this atomization method is compared with traditional aerosolization method, add the fragmentation of water under high pressure, powder size is more tiny, this atomization method is compared with traditional water atomization process simultaneously, owing to adding the precrushing effect of gas, the atomization water yield used greatly reduces, the contraction process of powder extends, therefore sphericity is better than traditional water atomization, and carry out in inert protective gas in whole atomization process, reduce the oxygen content of powder, and the jet position of intersecting point of several groups of high pressure water atomization nozzles in this method is different, therefore drop is through multiple fragmentation, reach the object that granularity is tiny.Therefore, the fine powder recovery rate prepared by this method is high, and powder size D50 is 8 ~ 10 μm, recovery rate > 60%; And powder morphology is subsphaeroidal, tap density is high, and powder size D50 is 8 ~ 10 μm of tap density > 4.6g/cm3; Meanwhile, oxygen content in power is low, and oxygen content in power < 4000ppm receives to obtain in institute.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view that the present invention prepares the atomization plant of ultra-fine subsphaeroidal hypoxemia metal dust;
Fig. 2 is the structural representation that the present invention prepares the high-pressure water nozzle of the atomization plant of ultra-fine subsphaeroidal hypoxemia metal dust;
Fig. 3 is that the outturn sample SEM of the embodiment of the present invention 1 schemes;
Fig. 4 is the outturn sample particle size distribution figure of the embodiment of the present invention 1;
Fig. 5 is that the outturn sample SEM of the embodiment of the present invention 2 schemes;
Fig. 6 is the outturn sample particle size distribution figure of the embodiment of the present invention 2;
Fig. 7 is that traditional water atomization outturn sample SEM schemes;
Fig. 8 is traditional water atomization outturn sample particle size distribution figure.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention will be further described.
Embodiment 1
As Figure 1-Figure 2, the present embodiment prepares the atomization plant of ultra-fine subsphaeroidal hypoxemia metal dust, comprise atomization bottom pour ladle 1, be arranged on the gases at high pressure atomization spray dish 2 on atomization bottom pour ladle 1 bottom surface, be arranged on gases at high pressure atomization spray and coil hydraulic atomized spray dish 3 on 2 bottom surfaces, be arranged on the powder collecting pot 5 that hydraulic atomized spray is coiled the atomizing cup 4 on 3 bottom surfaces and is positioned at below atomizing cup 4, wherein gases at high pressure atomization spray dish 2, a passage be interconnected 6 is provided with in hydraulic atomized spray dish 3 and atomizing cup 4, nebulization region is formed in this passage 6, and this passage 6 is connected with the leakage eye arranged bottom atomization bottom pour ladle 1, and the water level in atomizing cup 4 body uses Pulp pump to control, on gases at high pressure atomization spray dish 2, be provided with ring-crack ventilation gases at high pressure nozzle 21 simultaneously, and the circumferential weld width L of this ring-crack ventilation gases at high pressure nozzle 21 is 1 ~ 5mm, angle ω is 45 ~ 75 °, and on hydraulic atomized spray dish 3, be circumferentially placed with at least two group high-pressure water nozzles, often organize high-pressure water nozzle to coil the symmetrically arranged hydraulic spray 7 of 3 central shaft by two along hydraulic atomized spray respectively and form, the water under high pressure that each hydraulic spray 7 sprays is covering of the fan distribution, the diameter d of nozzle is 0.5 ~ 1.0mm, and the high pressure water atomization nozzle one_to_one corresponding in position on two of symmetry hydraulic sprays 7, and the angle ψ between two high pressure water atomization nozzles that position is corresponding is 25 ~ 65 °, as shown in Figure 1, angle ψ sets gradually as ψ 1 from top to bottom, ψ 2, ψ 3, ψ n, and ψ 1 > ψ 2 > ψ 3 > ... > ψ n, and as shown in Figure 2, covering of the fan included angle between adjacent two high pressure water atomization nozzles on same high-pressure water nozzle 7 is 5 ~ 35 °.
The atomization method of the atomization plant of the ultra-fine subsphaeroidal hypoxemia metal dust of the preparation described in the present embodiment, comprises the following steps:
Raw material metal is put into intermediate frequency furnace melting by S1, the degree of superheat of metal is 100 ~ 200 DEG C, and use the deoxidation of specific complex deoxidier to remove the gred, improve the purity of metal bath, and the double deoxidizer used is one or several combinations in calcium-silicon or calcium silicomangan or pure silicon;
The molten metal of melting is toppled in the atomization bottom pour ladle of atomization plant by S2, leakage eye under the suction function that molten metal produces at gravity and high pressure draught, High-Pressure Water bottom bottom pour ladle flows into nebulization region, and the flow velocity that molten metal flows into nebulization region is 8 ~ 20kg/min;
S3 metal liquid stream becomes molten drop under the atomizing of gases at high pressure, and molten drop is formed as fine droplets by the fragmentation of repeatedly water under high pressure; Wherein, the gases at high pressure of use are inert gas, and its pressure is 0.2 ~ 0.6MPa, and flow is 1 ~ 3m3/min; The pressure of the water under high pressure used is 80 ~ 120MPa, and flow is 35 ~ 75L/mim;
S4 fine droplets is subsphaeroidal along being constantly shrunk in atomizing cup dropping process, falls into powder collecting pot water and cools; And be atomized water level in cylindrical shell and use Pulp pump to control, the distance that the cooling water surface is put in its atomization is bottom 3 ~ 5m;
S5 is separated cooling the powder obtained by pigment, and loads vacuum drier, packing and storing after classified detection.
Particularly, the present embodiment is specifically described to prepare ultra-fine subsphaeroidal hypoxemia austenite 316L powder of stainless steel.
Take 316L ingredient composition by weight percentage: Fe:65%, Cr:18%, Ni:14%, Mo:3%.Gross weight 100kg, join in mid-frequency melting furnace fusing of heating, treat alloy melting, use specific complex deoxidier deoxidation slagging-off, and measuring tempeature is when being 1650 DEG C, molten metal bath is poured in atomization bottom pour ladle 1, molten metal flows into atomization zoning by the leakage eye bottom atomization bottom pour ladle, controlling metal liquid stream speed is 10kg/min, inert atomizing gas selects nitrogen, pressure is 0.45MPa, flow is 2.5m3/mim, the circumferential weld width L of ring-crack ventilation gases at high pressure nozzle 21 is 2mm, gas jet apex angle ω is 60 °, high pressure water atomization nozzle on each high-pressure water nozzle 7 is all set to two, and be all placed in the below of ring-crack ventilation gases at high pressure nozzle 21, on same high-pressure water nozzle 7, the water under high pressure of ejection is covering of the fan distribution, covering of the fan included angle is 25 °, and high pressure water atomization nozzle diameter d be 0.8mm, angle ψ 1 between two high pressure water atomization nozzles that position is relative is 40 °, ψ 2 is 30 °, the atomized water pressure used is 0MPa, flow is 70L/mim.Use Pulp pump to control water level in atomizing cup 4 body, its be atomized bottom a little to the distance in powder collecting pot 5 inner cooling water face be 4m.316L metal liquid stream is by the fragmentation of gases at high pressure and water under high pressure, and through being shrunk to spherical powder (as shown in Figure 3), tap density height is 4.71g/cm3.Meanwhile, the oxygen content of powder is low, is 3200ppm.Further, as shown in Figure 4, the granularity D50 of the powder of acquisition is 8.067 μm, and recovery rate is 65%.
Embodiment 2
The present embodiment adopts the Apparatus and method for identical with embodiment 1, but particularly, the present embodiment is specifically described to prepare ultra-fine subsphaeroidal hypoxemia 17-4PH powder of stainless steel.
Take 17-4PH ingredient composition by weight percentage: Fe:75.8%, Cr:16%, Ni:4%, Cu:4%, Nb:0.2%.Gross weight 100kg, join in mid-frequency melting furnace fusing of heating, treat alloy melting, use specific complex deoxidier deoxidation slagging-off, and measuring tempeature is when being 1650 DEG C, molten metal bath is poured in atomization bottom pour ladle 1, molten metal flows into nebulization region by the leakage eye bottom atomization bottom pour ladle 1, controlling metal liquid stream speed is 10kg/min, inert atomizing gas selects nitrogen, pressure is 0.4MPa, flow is 2m3/mim, the circumferential weld width L of ring-crack ventilation gases at high pressure nozzle 21 is 2mm, gas jet apex angle ω is 60 °, high pressure water atomization nozzle on each high-pressure water nozzle 7 is all set to two, and be all placed in the below of ring-crack ventilation gases at high pressure nozzle 21, on same high-pressure water nozzle 7, the water under high pressure of ejection is covering of the fan distribution, covering of the fan included angle is 15 °, and the diameter d of high pressure water atomization nozzle is 0.8mm, angle ψ 1 between two high pressure water atomization nozzles that position is relative is 45 °, ψ 2 is 35 °, the atomized water pressure used is 0MPa, flow is 70L/mim.Use Pulp pump to control water level in atomizing cup 4 body, its be atomized bottom a little to the distance in powder collecting pot 5 inner cooling water face be 4m.17-4PH metal liquid stream is by the fragmentation of gases at high pressure and water under high pressure, and through being shrunk to spherical powder (as shown in Figure 5), tap density height is 4.63g/cm3.Meanwhile, the oxygen content of powder is low, is 3400ppm.Further, as shown in Figure 6, the granularity D50 of the powder of acquisition is 8.317 μm, and recovery rate is 63%.
As shown in Figure 7, for traditional water atomization outturn sample SEM schemes; As shown in Figure 8, be traditional water atomization outturn sample particle size distribution figure.No matter be can clearly be seen that by these two figure, compared with powder prepared by its powder prepared and the present invention, be on pattern, or in granularity, or all there is larger difference in recovery rate.And the present invention is owing to adding the precrushing effect of gas; the atomization water yield used greatly reduces, and the contraction process of powder extends, and therefore sphericity is better than traditional water atomization; and carry out in inert protective gas in whole atomization process, reduce the oxygen content of powder.
Embodiment 3
The present embodiment prepares the atomization method of ultra-fine subsphaeroidal hypoxemia metal dust, said method comprising the steps of:
Raw material metal is put into intermediate frequency furnace melting by S1, and wherein the degree of superheat of metal is 100 ~ 200 DEG C, uses double deoxidizer deoxidation slagging-off;
The molten metal of melting is toppled in the atomization bottom pour ladle of atomization plant by S2, and the leakage eye under the suction function that molten metal produces at gravity and high pressure draught, High-Pressure Water bottom bottom pour ladle flows into nebulization region with 8 ~ 20kg/min flow velocity; Wherein said gases at high pressure are inert gas, and its pressure is 0.2 ~ 0.6MPa, and flow is 1 ~ 3m3/min; The pressure of described water under high pressure is 80 ~ 120MPa, and the flow of described water under high pressure is 35 ~ 75L/mim.
Metal liquid stream described in S3 becomes molten drop under the atomizing of gases at high pressure, and molten drop is formed as fine droplets by the fragmentation of repeatedly water under high pressure;
Fine droplets described in S4 is subsphaeroidal along being constantly shrunk in atomizing cup dropping process, falls into atomizing cup bottom water and cools;
S5 is separated cooling the powder obtained by pigment, and loads vacuum drier, carries out drying.
In the various embodiments described above, described double deoxidizer is calcium-silicon, calcium silicomangan and/or pure silicon.
In the various embodiments described above, the water level in described atomization cylindrical shell is controlled by Pulp pump, and in described atomization cylindrical shell, the distance of the cooling water surface is put in atomization is bottom 3 ~ 5m.
The present invention be should be understood that; above-described embodiment; further detailed description has been carried out to object of the present invention, technical scheme and beneficial effect; these are only embodiments of the invention; be not intended to limit the present invention, every within spiritual principles of the present invention, done any amendment, equivalent replacement, improvement etc.; all should be included within protection scope of the present invention, the protection domain that protection scope of the present invention should define with claim is as the criterion.
Claims (10)
1. prepare an atomization method for ultra-fine subsphaeroidal hypoxemia metal dust, it is characterized in that, said method comprising the steps of:
Raw material metal is put into intermediate frequency furnace melting by S1, and uses double deoxidizer deoxidation to remove the gred;
The molten metal of melting is toppled in the atomization bottom pour ladle of atomization plant by S2, and the leakage eye under the suction function that molten metal produces at gravity and high pressure draught, High-Pressure Water bottom bottom pour ladle flows into nebulization region with predetermined flow velocity;
Metal liquid stream described in S3 becomes molten drop under the atomizing of gases at high pressure, and molten drop is formed as fine droplets by the fragmentation of repeatedly water under high pressure;
Fine droplets described in S4 is subsphaeroidal along being constantly shrunk in atomizing cup dropping process, falls into atomizing cup bottom water and cools;
S5 is separated cooling the powder obtained by pigment, and loads vacuum drier, carries out drying.
2. the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 1, is characterized in that, described double deoxidizer is calcium-silicon, calcium silicomangan and/or pure silicon.
3. the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 1, is characterized in that, in described step S1 in raw material metal fusion process, the degree of superheat of metal is 100 ~ 200 DEG C.
4. the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 1, is characterized in that, in described step S2, molten metal flows into the predetermined flow velocity of nebulization region is 8 ~ 20kg/min.
5. the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 1, it is characterized in that, described gases at high pressure are inert gas, and the pressure of described gases at high pressure is 0.2 ~ 0.6MPa, and the flow of described gases at high pressure is 1 ~ 3m3/min.
6. the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 1, is characterized in that, the pressure of described water under high pressure is 80 ~ 120MPa, and the flow of described water under high pressure is 35 ~ 75L/mim.
7. the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 1, it is characterized in that, water level in described atomization cylindrical shell is controlled by Pulp pump, and in described atomization cylindrical shell, the distance of the cooling water surface is put in atomization is bottom 3 ~ 5m.
8. prepare the atomization plant of ultra-fine subsphaeroidal hypoxemia metal dust for one kind, this equipment is used for the atomization method of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation described in above-mentioned arbitrary claim, it is characterized in that, described equipment comprises atomization bottom pour ladle (1), be arranged on gases at high pressure atomization spray dish (2) on atomization bottom pour ladle (1) bottom surface, be arranged on the hydraulic atomized spray dish (3) on gases at high pressure atomization spray dish (2) bottom surface, be arranged on the atomizing cup (4) on hydraulic atomized spray dish (3) bottom surface and be positioned at the powder collecting pot (5) below atomizing cup (4), wherein said gases at high pressure atomization spray dish (2), a passage be interconnected (6) is provided with in hydraulic atomized spray dish (3) and atomizing cup (4), this passage is formed with nebulization region in (6), and the leakage eye that this passage (6) and atomization bottom pour ladle (1) bottom are arranged is connected, described gases at high pressure atomization spray dish (2) are provided with ring-crack ventilation gases at high pressure nozzle (21), described hydraulic atomized spray dish (3) is circumferentially placed with at least two group hydraulic sprays, often organize hydraulic spray and comprise two respectively along the symmetrically arranged hydraulic spray of hydraulic atomized spray dish (3) central shaft (7), the water that each hydraulic spray (7) sprays is fan-shaped arrangement.
9. the atomization plant of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 8, is characterized in that, the circumferential weld width L of described ring-crack ventilation gases at high pressure nozzle (21) is 1 ~ 5mm, and angle ω is 45 ~ 75 °.
10. the atomization plant of the ultra-fine subsphaeroidal hypoxemia metal dust of preparation according to claim 8, it is characterized in that, the diameter d of described each high pressure water atomization nozzle is 0.5 ~ 1.0mm, angle ψ between two high pressure water atomization nozzles that position is corresponding is 25 ~ 65 °, the water under high pressure being positioned at the upper ejection of same high-pressure water nozzle (7) is covering of the fan distribution, and covering of the fan included angle is 5 ~ 35 °.
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