CN100469494C - Production facility and production method for atomized producing ball-shaped magnesite powder - Google Patents
Production facility and production method for atomized producing ball-shaped magnesite powder Download PDFInfo
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- CN100469494C CN100469494C CNB2006100994949A CN200610099494A CN100469494C CN 100469494 C CN100469494 C CN 100469494C CN B2006100994949 A CNB2006100994949 A CN B2006100994949A CN 200610099494 A CN200610099494 A CN 200610099494A CN 100469494 C CN100469494 C CN 100469494C
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Abstract
The invention relates to a device for producing atomized ball magnesium powder. Wherein, it comprises vacuum smelting furnace connected to vacuum system; circulate water cooling system connected to the furnace, pressure balance pot and the water cooler of atomizer; a limit distributor at the atomizer and a thermal-insulated pot with plug rod; the distributor is a metal with through hole at center, while its wall has radial gas inlet and a gas channel under the inlet; the end of gas channel is through to the end of through hole, to connect the material outlet of atomizer; the material outlet of atomizer via tube is connected to eccentric classifier, cyclone classifier, deduster and eccentric fan; another tube of deduster is connected to the eccentric fan of balance pot; the pot via tube is connected to gas bottle, and connected to vacuum system via another tube. The inventive magnesium powder has high density and better ball shape.
Description
Technical field
The present invention relates to a kind of production technology and special equipment of magnesium powder, more particularly relate to a kind of production technology and special equipment thereof of the ball-shaped magnesite powder that atomizes.
Background technology
Metal dust, especially magnesium powder, in industrial circles such as powder metallurgy, steel-making, chemical industry, pottery, electronics and military project, be widely used, it is except that making various mechanical parts and relevant material, also can directly apply to many places, for example as pigment, additive, catalyst, printing ink, fire-lighter, welding rod, coating, duplicating carrier and agricultural or the like.Especially spherical submicron metal, because of it has higher apparent density and higher activity, so in munitions industry than irregular powder with preferential employing, as ball-shaped magnesite powder used in the firebomb.
The method of producing the magnesium powder at present has mechanical crushing method and centrifugal atomizing method, mechanical crushing method is exactly to produce magnesium chips by milling machine, magnesium chips is transported in the eddy current magnesium powder machine of at a high speed rotation, magnesium chips is constantly friction mutually, collision in the high-speed eddy machine, grinds off corner angle and curls and form hollow powder.This magnesium powder is rough, out-of-shape, and activity and apparent density are low, and size distribution is at the 20-150 order.
The centrifugal atomizing method is that melt metal magnesium liquid is atomized into ball-shaped magnesite powder by the centrifugal turntable of rotation at a high speed under argon shield.
Name is called " method of producing ultrafine spherical magnesium powder ", and the Chinese patent of patent No. ZL02123552.X discloses a kind of method of producing ultrafine spherical magnesium powder, comprises magnesium ingot raw material handling impurity, is fused into magnesium liquid, magnesium liquid is atomized, separates; It is characterized in that the described atomizing of magnesium liquid is meant adopted the centrifugal atomizing method in atomization tank, comprise step: a. is with magnesium liquid heated at constant temperature, and the maintenance constant speed; B. with the centrifugal droplet that gets rid of into of the magnesium liquid of constant temperature constant speed; C. droplet is cooled to powder by inert gas, described inert gas is cooled to powder to be separated and is meant that the argon gas sealing and circulating is cooled to powder and separates.
Adopt the magnesium powder smooth surface of method for preparing, active and apparent density height, but meso-position radius d
50=45 μ m (wherein the following powder of 325 orders accounts for 40%) are only near 40%; and yield poorly; the energy consumption of unit product height can't long-time continuous production, and only use argon gas as protective gas; magnesium powder surface does not have passivation layer; activity is very high, occurs thinner magnesium powder aborning once contacting with air, is exposed to airborne magnesium granules and carries out oxidation reaction with oxygen immediately; emit big calorimetric, easily cause burning and blast.
Summary of the invention
The objective of the invention is to overcome the existing technology of magnesium powder and the defective that there is unsafe factor in equipment of producing, thereby provide a kind of can long-time continuous production, the production method of safe and reliable atomizing ball-shaped magnesite powder, and provide a kind of magnesium powder yield height, special equipment that energy consumption of unit product is low of can making.
The object of the present invention is achieved like this:
The production equipment of preparation atomizing ball-shaped magnesite powder provided by the invention, comprise a vacuum smelting furnace 4 that is connected with vacuum system 24, the production equipment of described atomized producing ball-shaped magnesite powder also comprises spray chamber 7, cyclone classifier 12, deduster 19, air pressure balance jar 21 and is positioned at the centrifugal blower 20 of described air pressure balance jar 21; It is characterized in that, also comprise circulating water cooling system, dynamically air compensating system, centrifugal classifier 10, the compressor 1 that is connected in series with described air pressure balance jar 21 and surge tank 2, are installed in the restraint-type distributor 6 in the described spray chamber 7 and the insulation crucible 5 of stopper rod 25 is installed; Wherein said restraint-type distributor 6 comprises a metal body 34, at described metal body 34 middle parts one bed thickness, 1～10mm applied corrosion resistant lining 28 is arranged, and its center has through hole as magnesium metal liquid passage 27, and the aperture of its magnesium metal liquid passage 27 is 2～20mm; And radially have the air inlet 29 that diameter is 3～20mm along the sidewall of described distributor body 34, open an air flue 30 at air inlet 29 below tiltedly, communicate with described air inlet 29, this air flue 30 is 20～90 ° with the angle of described magnesium metal liquid passage 27, the end of described air flue 30 extends to the end of magnesium metal liquid passage 27, and the end of this air flue 30 and magnesium metal liquid passage 27 communicates with the discharging opening of described spray chamber 7;
Wherein said vacuum smelting furnace 4 discharging openings insert in the described insulation crucible 5 by the pipeline 411 that has heat-insulation layer, this insulation crucible 5 is installed on the restraint-type distributor 6, and the bottom liquid hole of insulation crucible 5 is aimed at the upper port of magnesium metal liquid passage 27, and they are installed in spray chamber 7 inner tops together; Described stopper rod 25 is against on the bottom liquid hole of insulation crucible 5, and the hoisting mechanism (not shown) that the other end of stopper rod 25 and is used to lift stopper rod 25 is connected; The outlet of described surge tank 2 is communicated with described air inlet 29 by air delivering pipeline 201; The discharging opening of described spray chamber 7 is communicated with the end mouth of centrifugal classifier 10 successively by conveying pipeline road 72, this centrifugal classifier 10 suitable for reading again with described cyclone classifier 12, described deduster 19 and 20 series connection of described centrifugal blower are communicated with, also be provided with the double-tube heat exchanger 8 and first tubular heat exchanger 11 on the conveying pipeline road 72 of described spray chamber 7, this spray chamber 7 suitable for reading is provided with a pipeline 71, this pipeline 71 is communicated with described air pressure balance jar 21 by secondary series heat exchange of heat pipe 9, and the discharging opening of described centrifugal classifier 10 is communicated with the first buffering batch can 13 and first successively and collects batch can 16; The suitable for reading of this centrifugal classifier 10 is communicated with the inlet of described cyclone classifier 12 by transporting pipe 101, first discharging opening of described cyclone classifier 12 is communicated with the second buffering batch can 14 and second successively and collects batch can 17, second discharging opening is communicated with the 3rd buffering batch can 15 and the 3rd successively and collects batch can 18, the upper outlet of this cyclone classifier 12 is communicated with deduster 19 by feeding pipe 121, another root pipeline 122 of this deduster 19 is communicated with the centrifugal blower 20 that is positioned at described air pressure balance jar 21, described air pressure balance jar 21 is connected to gas cylinder group 23 by the gas transmission line 2101 of band valve, and is connected with vacuum system 24 by another root gas pipeline 2102; Described circulating water cooling system is connected to water-cooling heat radiating device (not shown) on double-tube heat exchanger 8, secondary series heat exchange of heat pipe 9, the first tubular heat exchangers 11 and compressor 1, spray chamber 7 and the air pressure balance jar 21 respectively by pipeline; Described dynamic air compensating system comprises argon content watch-dog (not shown) and the nitrogen cylinder 22 that is communicated with described air pressure balance jar 21 by appendix 221.
In above-mentioned technical scheme, be provided with the explosion venting device (not shown) on described vacuum smelting furnace 4, spray chamber 7, the air pressure balance jar 21.
In above-mentioned technical scheme, described explosion venting device is clipping circular rupture disk, and its burst pressure is 0.2～1.0Mpa.
In above-mentioned technical scheme, described applied corrosion resistant lining is in the cave stone lining.
In above-mentioned technical scheme, described air flue (30) is up big and down small taper shape.
The method for preparing the ball-shaped magnesite powder that atomizes provided by the invention is characterized in that may further comprise the steps:
(1) preparation of mixed inert gas: earlier whole atomization system is vacuumized, charge into nitrogen and argon gas then in the air pressure balance jar, the percent by volume 76%～90% of argon gas wherein, surplus is a nitrogen, stop inflation when pressure is 101～102Kpa in whole system, in air pressure balance jar 21, under the effect of centrifugal blower 20, two kinds of gases are fully mixed, obtain mixed inert gas; Open compressor 1 mixed inert gas is boosted in the surge tank 2, making the pressure in the surge tank 2 is 1～2MPa, and the low pressure mist in the surge tank 2 is as the gas source of atomization metal magnesium liquid;
(2) vacuum metling: in vacuum smelting furnace 4, will be heated to 830 1 850 ℃ through the metal magnesium ingot of cleaning, drying, and feed volumetric concentration simultaneously and be 0.1～5% sulfur hexafluoride the magnesium liquid of fusion is protected;
(3) conveying of magnesium liquid: 5 to 800～850 ℃ in heat tracing crucible is transported to the insulation crucible 5 that is positioned at spray chamber 7 tops to the magnesium metal liquid in the vacuum smelting furnace 4 then; Then open the centrifugal blower 20 in compressor 1 and the air pressure balance jar 21;
(4) cooling of the atomizing of magnesium liquid and magnesium powder: make magnesium liquid with the flow of 20～300kg/h by the magnesium metal liquid passage 27 in the restraint-type distributor 6, and be 1.0～2.0Mpa by the pressure that blows out step 1 preparation from air flue 30, flow is 50～2000m
3The mixed inert gas of/h is atomized into metal magnesium powder with the magnesium liquid of fusion, and metal magnesium powder is argon gas and the cooling of nitrogen mixed inert gas of 800～20000m3/h by the flow from pipeline 71 simultaneously;
(5) separated and collected of magnesium powder: the magnesium powder that step (4) is obtained; successively deliver into centrifugal classifier 10 separates and obtain different-grain diameter with cyclone classifier 12 magnesium powder product, then encapsulation storage under argon gas described in the step (1) and the protection of nitrogen mixed inert gas.
In the technique scheme, in the mist of described argon gas and nitrogen, argon content accounts for 76～90% of cumulative volume, and surplus is a nitrogen.
Advantage of the present invention is:
The production equipment of atomizing ball-shaped magnesite powder provided by the invention, owing to adopted a kind of restraint-type distributor 6, can feed the mixed inert gas flow of this restraint-type distributor 6 by control, with the flow that can adjust magnesium metal liquid within the specific limits, just can realize adjusting the normal distribution of atomizing magnesium powder particles particle diameter, the effect of producing is played conclusive effect.
Since the inert gas that the present invention adopts is an argon content account for cumulative volume 76～90%, surplus is the mist of nitrogen, and this mixed inert gas will will prepare before atomization metal magnesium liquid in advance, use this mixed inert gas atomizing and cooling magnesium powder, can guarantee the safety (possibility of not burning and exploding in process of production) of producing, the quality that can guarantee the magnesium powder does not again descend, and can also improve the fine powder yield simultaneously.
Low pressure mixed inert gas structure is arranged in the production equipment of the present invention; also has dynamic air compensating system; prevent the protection of oxidation when utilizing the mist of argon gas and nitrogen to the cooling of the atomizing of magnesium liquid, magnesium powder; when packing, also carry out the protection of low pressure mixed inert gas like this; make that on the one hand magnesium powder and air are isolated; anti-oxidation guarantees the safety in the production process on the other hand.
This production equipment is simple in structure, all can recycle use to the material that occurs in gas and the production process, and explosion venting device is installed, and has guaranteed the security and the reliability of producing.
Description of drawings
The production system of Fig. 1 atomizing ball-shaped magnesite powder of the present invention is formed schematic diagram;
Fig. 2 restraint-type distributor of the present invention schematic diagram;
The production technology embodiment flow chart of Fig. 3 atomizing ball-shaped magnesite powder of the present invention;
Drawing is described as follows:
1-compressor, 2-surge tank, 3-protective gas gas cylinder
4-vacuum smelting furnace 5-insulation crucible 6-restraint-type distributor
7-spray chamber, 8-double-tube heat exchanger, 9-secondary series heat exchange of heat pipe
10-centrifugal classifier, 11-the first tubular heat exchanger, 12-cyclone classifier
13-the first buffering batch can, 14-the second buffering batch can, 15-the three buffering batch can
16-the first collects batch can 17-the second collects batch can 18-the three collection batch can
19-deduster, 20-centrifugal blower, 21-air pressure balance jar
22-nitrogen cylinder, 23-gas cylinder group, 24-vacuum system
25-stopper rod device, 26-magnesium metal liquid, 27-magnesium metal liquid passage
28-applied corrosion resistant lining, 29-air inlet, 30-air flue
33-circulating water cooling system, 34-distributor body, 411-pipeline
201-air delivering pipeline, 72-conveying pipeline road, 71-pipeline
101-transport and manage 121-feeding pipe, 122-pipeline
2101-gas transmission line, 2 102-gas pipeline, 221-appendix
The specific embodiment:
The present invention will be further described below in conjunction with specific embodiment.
Embodiment 1
Make the production equipment of an atomizing ball-shaped magnesite powder, comprise: a restraint-type distributor 6, the structure of this restraint-type distributor 6 as shown in Figure 2, adopt a stainless steel cylinder to do metal body 34, open the through hole that a diameter is 15mm in body 34 central vertical, in the cave stone lining of this through hole liner one thick 5mm 28, form the magnesium metal liquid passage 27 of a diameter 5mm, sidewall along metal body 34 radially has the air inlet 29 that diameter is 10mm, air inlet 29 tiltedly below open an air flue 30, air flue is up big and down small taper shape, the air flue diameter is 2mm, and and the angle of magnesium metal liquid passage 27 between 20 °-90 ° all can, present embodiment is preferably 30 ° of angles; The other end of air flue 30 extends to the end of distributor body 34, and is communicated with the lower port of magnesium metal liquid passage 27, and the outlet of positive alignment spray chamber 7.
With reference to figure 1, vacuum smelting furnace 4 for example adopts: the magnesium melting furnace of Qingdao electric furnace factory, the discharging opening of this vacuum smelting furnace 4 is inserted in the insulation crucible 5 by the pipeline 411 that has heat-insulation layer, this insulation crucible 5 is installed on the restraint-type distributor 6, and in the insulation crucible 5 stopper rod 25 is installed also, its bottom has the liquid hole, this liquid hole is aimed at the upper port of magnesium metal liquid passage 27, stopper rod 25 is against on the bottom liquid hole of insulation crucible 5, it is (not shown that the other end of stopper rod 25 and is used to lift the hoisting mechanism of stopper rod 25, as lift) connect, hoisting mechanism is connected with control system.Spray chamber 7 is cylindric, and the bottom is taper, and on the sidewall clipping circular rupture disk is installed, and its burst pressure is 0.2～1.0Mpa; The discharging opening of this spray chamber 7 also is provided with the double-tube heat exchanger 8 and first tubular heat exchanger 11 by conveying pipeline road 72 connection of connecting with centrifugal classifier 10, cyclone classifier 12, deduster 19 and centrifugal blower 20 successively on the conveying pipeline road 72 of spray chamber 7.Spray chamber 7 suitable for reading is provided with a pipeline 71, and this pipeline 71 is communicated with air pressure balance jar 21 by secondary series heat exchange of heat pipe 9, and the discharging opening of centrifugal classifier 10 is communicated with first successively and cushions the batch can 13 and the first collection batch can 16; The suitable for reading of this centrifugal classifier 10 is communicated with the inlet of described cyclone classifier 12 by transporting pipe 101, first discharging opening of described cyclone classifier 12 is communicated with the second buffering batch can 14 and second successively and collects batch can 17, second discharging opening is communicated with the 3rd buffering batch can 15 and the 3rd successively and collects batch can 18, the upper outlet of this cyclone classifier 12 is communicated with deduster 19 by feeding pipe 121, another root pipeline 122 of this deduster 19 is communicated with the centrifugal blower 20 that is positioned at described air pressure balance jar 21, air pressure balance jar 21 is connected to by the gas transmission line 2101 of being with valve can provide the gas cylinder of nitrogen and argon gas group 23, with be connected with vacuum system 24 by another root gas pipeline 2102, also by pipeline 211 polyphone one compressor 1 and surge tanks 2, described surge tank 2 is communicated with the air inlet 29 of described restraint-type distributor 6 by air delivering pipeline 201 this air pressure balance jar 21; The gas cylinder 3 that the protective gas sulfur hexafluoride is housed is connected to vacuum smelting furnace 4 by gas circuit, and the discharging opening of this vacuum smelting furnace 4 is connected to insulation crucible 5 by insulation heating pipe line 411.
This complete equipment also comprises a dynamic air compensating system, and this dynamic air compensating system is formed with the nitrogen cylinder 22 that described air pressure balance jar 21 is communicated with by argon content watch-dog (not shown) with by pipeline.
Described vacuum system 24 adopts rotary-vane vaccum pump (2X-70).
Circulating water cooling system, comprise cooling tower, cooling pond, clarified water pump (not shown), this system is connected to double-tube heat exchanger 8, secondary series heat exchange of heat pipe 9 respectively by pipeline, first tubular heat exchanger 11, and the water-cooling heat radiating device (not shown) on compressor 1, vavuum pump, spray chamber 7 and the air pressure balance jar 21.
Embodiment 2
Adopt the special equipment among the embodiment 1 to produce the atomizing ball-shaped magnesite powder, its technological process of production as shown in Figure 3, preparation process comprises:
(1) preparation of mixed inert gas
The source of mixed inert gas is shown in Figure 1, the gas cylinder group of forming by argon gas and nitrogen gas cylinder 23, use vavuum pump 24 to vacuumize whole atomization system earlier, charge into two kinds of gases of nitrogen and argon gas then in the air pressure balance jar, stop inflation when pressure is 101～102Kpa in whole system, the percent by volume of wherein said argon gas is all passable in 76～90% scope, surplus is a nitrogen, the percent by volume of the preferred argon gas of present embodiment is 80%, the percent by volume of nitrogen is 20%, perhaps the percent by volume of preferred argon gas is 90%, and the percent by volume of nitrogen is 10%; In air pressure balance jar 21, under the effect of centrifugal blower 20, two kinds of gases are fully mixed, obtain mixed inert gas; Open compressor 1 mixed inert gas is boosted in the surge tank 2, making the pressure in the surge tank 2 is 1MPa, and the low pressure mist in the surge tank 2 is as the gas source of atomization metal magnesium liquid.
(2) vacuum metling fusing
Metal magnesium ingot behind the cleaning, drying is put into vacuum smelting furnace 4, feed protective gas argon gas and SF
6, SF
6Volumetric concentration is controlled to be 0.7%, then magnesium ingot is heated to molten condition, begins insulation when the temperature of magnesium liquid rises to 840 ℃, and the smelter does to finish.
(3) conveying of magnesium liquid
Heat tracing crucible to 800～850 ℃, be delivered to the magnesium metal liquid in the vacuum smelting furnace 4 in the insulation crucible 5 on spray chamber 7 tops by pipeline 411 then, totally-enclosed and the insulation heating of whole transportation process, prevent that magnesium liquid cooling from solidifying, when be transported to the magnesium liquid of insulation in the crucible static stable after, open the centrifugal blower 20 in compressor 1 and the air pressure balance jar 21, prepare atomizing;
(4) cooling of the atomizing of magnesium liquid and magnesium powder
After 20 runnings of compressor 1 and centrifugal blower are stable, pull out the stopper rod device 25 that opens insulation crucible 5 bottoms, magnesium metal liquid 26 flows into the magnesium metal liquid passage 27 of restraint-type distributor 6 with flow 20kg/h through insulation crucible 5 bottoms; The flow that blows out in air flue 30 lower port is 50m
3Under the effect of the mixing low-pressure inert gas of/h, magnesium metal liquid is atomized into metal magnesium powder, and in the extremely short time, cooled off from the nitrogen of pipeline 71 and the mixed inert gas of argon gas, wherein the percent by volume of argon gas is 80%, the percent by volume of nitrogen is 20%, and flow is at 800～20000m
3All can between/the h.
(5) separated and collected of magnesium powder
At first pass through conveying pipeline road 72 under the drive of cooled magnesium powder and mixed inert gas centrifugal blower 20 in air pressure balance jar 21, by double-tube heat exchanger 8 and 11 coolings of first tubular heat exchanger, enter the product that centrifugal classifier 10 and cyclone classifier 12 are separated different size then; The magnesium powder product that is separated falls into first of centrifugal classifier 10 and cyclone classifier 12 bottoms respectively and collects in batch can 16, the second collection batch can 17 and the 3rd collection batch can 18, when the magnesium opaque amount in collecting batch can reaches 20～50kg, the magnesium powder is carried out vacuum packaging by the passage that described mixed inert gas is arranged.
In whole production technology, the low pressure mixed inert gas of atomization metal magnesium liquid is recycled after deduster 19 dedustings, and the gas of leakage can constantly replenish by gas cylinder group 23.Be used for cooling off the circulation cooling air of atomizing back magnesium powder by double-tube heat exchanger 8, first tubular heat exchanger 11 and 9 heat transferred circulating water cooling systems that absorb of secondary series heat exchange of heat pipe, the temperature of circulation cooling air can keep constant like this, and the temperature of system can be controlled at lower state.
The argon content of mist is the assurance of decision production safety in this cover production technology, when argon content is too high, magnesium powder surface-active is higher, connect the easy spontaneous combustion of when place with air, and argon content is when low, the security of system has problem, therefore this cover production technology has dynamic air compensating system, the argon content watch-dog is monitored argon content in real time, and adjusts argon gas volume content percentage by nitrogen cylinder 22, guarantees the normal operation of producing.
The magnesium powder D that this production technology is produced
50The recovery rate of=45 μ m can reach 70%.
Claims (7)
1. the production equipment of an atomized producing ball-shaped magnesite powder, comprise a vacuum smelting furnace (4) that is connected with vacuum system (24), the production equipment of described atomized producing ball-shaped magnesite powder also comprises spray chamber (7), cyclone classifier (12), deduster (19), air pressure balance jar (21), is positioned at the centrifugal blower (20) of described air pressure balance jar (21), the circulating water cooling system (33) that is connected with water cooling plant with vacuum smelting furnace (4), air pressure balance jar (21) and spray chamber (7); It is characterized in that, also comprise dynamic air compensating system, centrifugal classifier (10), be connected in series with the insulation crucible (5) that the compressor (1) of described air pressure balance jar (21) and surge tank (2), are installed in the restraint-type distributor (6) in the described spray chamber (7) and stopper rod (25) is installed; Wherein said restraint-type distributor (6) comprises a metal body (34), at described metal body (34) middle part one bed thickness, 1～10mm applied corrosion resistant lining (28) is arranged, its center has through hole as magnesium metal liquid passage (27), and the aperture of its magnesium metal liquid passage (27) is 2～20mm; And radially have the air inlet that diameter is 3～20mm (29) along the sidewall of described metal body (34), tiltedly open an air flue (30) in the below at air inlet (29), communicate with described air inlet (29), this air flue (30) is 20～90 ° with the angle of described magnesium metal liquid passage (27), the end of described air flue (30) extends to the end of magnesium metal liquid passage (27), and the end of this air flue (30) and magnesium metal liquid passage (27) communicates with the discharging opening of described spray chamber (7);
Wherein said vacuum smelting furnace (4) discharging opening inserts in the described insulation crucible (5) by the pipeline (411) that has heat-insulation layer, this insulation crucible (5) is installed on the restraint-type distributor (6), and the liquid hole of insulation crucible (5) bottom is aimed at the upper port of the magnesium metal liquid passage (27) of restraint-type distributor (6), and they are installed in the spray chamber (7) together; Described stopper rod (25) is against on the bottom liquid hole of insulation crucible (5), and the hoisting mechanism that the other end and of stopper rod (25) is used to lift stopper rod (25) is connected; The outlet of described surge tank (2) is communicated with the air inlet (29) of described restraint-type distributor (6) by air delivering pipeline (201); The discharging opening of described spray chamber (7) is communicated with the end mouth of centrifugal classifier (10) by conveying pipeline road (72), this centrifugal classifier (10) suitable for reading again with described cyclone classifier (12), described deduster (19) and described centrifugal blower (20) series connection are communicated with, also be provided with double-tube heat exchanger (8) and first tubular heat exchanger (11) on the conveying pipeline road (72) of described spray chamber (7), the pipeline (71) that is provided with suitable for reading of this spray chamber (7), this pipeline (71) is communicated with described air pressure balance jar (21) by secondary series heat exchange of heat pipe (9), and the discharging opening of described centrifugal classifier (10) is communicated with the first buffering batch can (13) and first successively and collects batch can (16); The suitable for reading of this centrifugal classifier (10) is communicated with the inlet of described cyclone classifier (12) by transporting pipe (101), first discharging opening of described cyclone classifier (12) is communicated with the second buffering batch can (14) and second successively and collects batch can (17), second discharging opening is communicated with the 3rd buffering batch can (15) and the 3rd successively and collects batch can (18), the upper outlet of this cyclone classifier (12) is communicated with deduster (19) by feeding pipe (121), another root pipeline (122) of this deduster (19) is communicated with the centrifugal blower (20) that is positioned at described air pressure balance jar (21), described air pressure balance jar (21) is connected to gas cylinder group (23) by the gas transmission line (2101) of band valve, and is connected with vacuum system (24) by another root gas pipeline (2102); Described circulating water cooling system (33) is communicated with the water cooling plant of compressor (1) and the water cooling plant of vacuum system (24) respectively by pipeline, and described circulating water cooling system (33) also is connected to double-tube heat exchanger (8), secondary series heat exchange of heat pipe (9) and first tubular heat exchanger (11) respectively by pipeline; Described dynamic air compensating system is formed by the argon content watch-dog with by the source nitrogen (22) that appendix (221) is communicated with described air pressure balance jar (21).
2. by the production equipment of the described atomized producing ball-shaped magnesite powder of claim 1, it is characterized in that, be provided with explosion venting device on described vacuum smelting furnace (4) or the air pressure balance jar (21).
3. by the production equipment of the described atomized producing ball-shaped magnesite powder of claim 1, it is characterized in that described spray chamber (7) is cylindric, its bottom is taper, and explosion venting device is installed on sidewall.
4. by the production equipment of claim 2 or 3 described atomized producing ball-shaped magnesite powders, it is characterized in that described explosion venting device is clipping circular rupture disk, its burst pressure is 0.2～1.0Mpa.
5. by the production equipment of the described atomized producing ball-shaped magnesite powder of claim 1, it is characterized in that described applied corrosion resistant lining (28) is in the cave stone lining.
6. by the production equipment of the described atomized producing ball-shaped magnesite powder of claim 1, it is characterized in that described air flue (30) is up big and down small taper shape.
7. a method for preparing ball-shaped magnesite powder is characterized in that, may further comprise the steps:
(1) preparation of mixed inert gas: earlier whole atomization system is vacuumized, charge into nitrogen and argon gas then in the air pressure balance jar, the percent by volume 76%～90% of argon gas wherein, surplus is a nitrogen, stop inflation when pressure is 101～102Kpa in whole system, in air pressure balance jar (21), under the effect of centrifugal blower (20), two kinds of gases are fully mixed, obtain mixed inert gas; Open compressor (1) mixed inert gas is boosted in the surge tank (2), making the pressure in the surge tank (2) is 1～2MPa, and the low pressure mist in the surge tank (2) is as the gas source of atomization metal magnesium liquid;
(2) vacuum metling: in vacuum smelting furnace (4), will be heated to 830-850 ℃, and feed protective gas argon gas and SF simultaneously through the metal magnesium ingot of cleaning, drying
6, the magnesium liquid of fusion is protected; Wherein the sulfur hexafluoride volumetric concentration is 0.1～5%;
(3) conveying of magnesium liquid: heat tracing crucible (5) is transported to the insulation crucible (5) that is positioned at spray chamber (7) top to the magnesium metal liquid in the vacuum smelting furnace (4) then to 800～850 ℃; Then open the centrifugal blower (20) in compressor (1) and the air pressure balance jar (21);
(4) cooling of the atomizing of magnesium liquid and magnesium powder: make magnesium liquid with the flow of 20～300kg/h by the magnesium metal liquid passage (27) in the restraint-type distributor (6), and be 1.0～2.0Mpa by the pressure that blows out step (1) preparation from air flue (30), flow is 50～2000m
3The mixed inert gas of/h is atomized into metal magnesium powder with the magnesium liquid of fusion, and metal magnesium powder is 800～20000m by the flow from pipeline (71) simultaneously
3The argon gas of/h and the cooling of nitrogen mixed inert gas;
(5) separated and collected of magnesium powder: the magnesium powder that step (4) is obtained; successively deliver into centrifugal classifier (10) separates and obtain different-grain diameter with cyclone classifier (12) magnesium powder product, then encapsulation storage under argon gas described in the step (1) and the protection of nitrogen mixed inert gas.
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|---|---|---|---|---|
| CN103537704A (en) * | 2013-03-15 | 2014-01-29 | 袁志刚 | Pneumatic atomization production method of high-purity fine spherical metal magnesium powder |
| CN104400006B (en) * | 2014-12-16 | 2017-02-22 | 中国科学院合肥物质科学研究院 | Device and process for preparing superfine uranium powder |
| CN104607642B (en) * | 2015-01-29 | 2017-10-27 | 天津百恩威新材料科技有限公司 | Spray chamber down cycles system and the method cooled using the system to spray chamber |
| CN109226777A (en) * | 2018-11-20 | 2019-01-18 | 泸溪县群祥新材料有限责任公司 | 2219 aluminium-based alloyed powders of one kind and its production method |
| CN109943736A (en) * | 2019-04-30 | 2019-06-28 | 北京欧菲金太科技有限责任公司 | A kind of aluminium V-Ti producing device and method |
| CN110976894A (en) * | 2020-01-03 | 2020-04-10 | 河南省远洋粉体科技股份有限公司 | Aluminum-based alloy powder vacuum gas atomization production system |
| CN114603148B (en) * | 2022-05-11 | 2022-07-05 | 成都大学 | Preparation device and preparation method of spherical alloy powder |
| CN114734047B (en) * | 2022-06-15 | 2022-08-23 | 沈阳欧特真空科技有限公司 | Continuous preparation equipment for hydrogen storage metal magnesium powder |
| CN116275063A (en) * | 2022-09-08 | 2023-06-23 | 四川万邦胜辉新能源科技有限公司 | Method for preparing high-activity spherical fine magnesium powder/magnesium lithium alloy powder by airflow atomization method |
-
2006
- 2006-07-24 CN CNB2006100994949A patent/CN100469494C/en not_active Expired - Fee Related
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