CN210892409U

CN210892409U - Gas protection type metal powder drying equipment

Info

Publication number: CN210892409U
Application number: CN201921136252.1U
Authority: CN
Inventors: 叶涛
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-07-19
Filing date: 2019-07-19
Publication date: 2020-06-30
Anticipated expiration: 2029-07-19

Abstract

The utility model relates to a gas protection formula metal powder drying equipment, include: a drying chamber for placing the dried metal powder particles or the mixture of the dried metal powder particles and the liquid; at least one gas outlet for exhausting gas inside the drying chamber; and the protective gas inlet is connected with a protective gas source and is used for introducing protective gas into the drying cavity. The drying device further comprises a heating device for heating the drying cavity. The residual liquid on the surface of the metal can be effectively evaporated and removed, and the process problem that the metal powder particles are easily oxidized in the drying process is solved.

Description

Gas protection type metal powder drying equipment

Technical Field

The utility model relates to a drying equipment for eliminating liquid from solid materials or products, in particular to a metal powder drying equipment.

Background

In the electronics or metal processing related industries, there is often a need to extract metals from metal salt solutions. Particularly in the field of treating metal-containing waste liquids, obtaining metal solids by electrolytic or chemical displacement methods is a common process. However, solid metal particles with a more porous structure are often obtained from electrolytic and chemical displacement processes. The surface area is large, and the alloy is often provided with solution or washing residual liquid, particularly copper, nickel, tin and other metal alloys which are easy to oxidize, and is easy to oxidize under the influence of air environment. For example, in the electrolysis of copper-containing solutions, copper metal is usually deposited as copper sponge or copper sheet at the cathode, and reacts with oxygen and carbon dioxide in the air to form basic copper carbonate in a humid environment, which affects the purity of the basic copper carbonate. Meanwhile, according to the current domestic regulations, the wet metal powder particles containing liquid residues are considered to be not in accordance with the environmental protection requirements and are generally considered as dangerous chemical wastes, so that the value of the metal powder particles and the circulation thereof are limited.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a gas protection formula metal powder drying equipment can effectively evaporate and get rid of the remaining liquid in metal surface, has solved the metal powder again and has oxidized the technological problem easily in the drying process.

The purpose of the utility model can be realized by adopting the following technical scheme:

a gas-shielded metal powder particle drying apparatus comprising:

a drying chamber for placing the dried metal powder particles or the mixture of the dried metal powder particles and the liquid;

at least one gas outlet for exhausting gas inside the drying chamber;

and the protective gas inlet is connected with a protective gas source and is used for introducing protective gas into the drying cavity.

The utility model discloses can also do following improvement:

heating means are provided for heating the drying chamber to encourage moisture and/or impurities in the drying chamber which may form a gas when heated to escape from the drying chamber.

Preferably, the heating device is a single heat source or consists of a heat source and a heat transfer medium; the heat transfer medium is liquid and/or gas, and is in contact with the wall of the drying chamber and/or passes through the interior of the container through a pipeline. More preferably, the heating device further comprises a pipe for conveying the heat transfer medium and an electric pump.

Still further preferably, a temperature control device is arranged to detect the temperature of the heat transfer medium of the heating device and/or the wall of the drying chamber and/or the gas inside the drying chamber and/or the metal powder particles in the drying chamber and/or the gas passing through the gas outlet, and control the temperature of the heat transfer medium of the heating device and/or the on-off of the heat source and/or the on-off of the heat transfer medium delivery electric pump.

The drying cavity is provided with a spinning device and/or a stirring device so that the metal powder particle solids in the drying cavity are heated more uniformly; the rotation power of the self-rotating device is driven by a hand and/or a motor to make the drying cavity perform self-rotating motion; the stirring device is arranged in the drying cavity, and the stirring power of the stirring device is driven by a hand and/or a motor.

One or more material inlet openings with sealing doors are arranged in the drying cavity and are used for the entry or the exit of metal powder particles; the gas outlet and/or the protective gas inlet can also be directly used as a material inlet of the metal powder particles.

And the gas outlet pipeline is connected with at least one vacuum pressure reducing device and is used for pumping and exhausting gas in the drying cavity.

Preferably, at least one buffer device is arranged on a pipeline connecting the air outlet and the vacuum pressure reducing device, the buffer device is a tank body provided with an air inlet and an air outlet, the air inlet of the buffer device is connected with the air outlet through a pipeline, and the air outlet of the buffer device is connected with the vacuum pressure reducing device through a pipeline.

More preferably, a drain opening is formed at the lower part of the buffer device.

Preferably, at least one pressure relief valve is arranged at the air outlet and/or the air suction port of the vacuum pressure reduction pumping device and/or the air outlet of the vacuum pressure reduction pumping device and/or the buffer device, and is used for adjusting the air pressure in the drying cavity.

The outer wall of the drying cavity is provided with a heat preservation layer for slowing down heat loss inside the drying cavity.

And the lower part of the drying cavity is provided with a water outlet for discharging liquid which can flow in the drying cavity. Preferably, the water outlet is provided with a filter screen for preventing metal powder particles from spilling out of the water outlet. Compared with the prior art, the utility model, following beneficial effect has:

(1) the invention can effectively prevent the metal surface from being oxidized at high temperature by using the protective gas in the drying process, and improve the quality and purity of the metal powder particles.

(2) The invention utilizes the heat absorption characteristic of the protective gas to timely cool the dried metal powder particles in the process of drying the metal powder particles, thereby improving the production efficiency.

(3) The invention can rapidly remove residual liquid on the surfaces of the metal particles, particularly solves the important problem that wet heavy metal particles belong to dangerous chemical wastes, and turns the original wet heavy metal particles into a commodity with use value after drying the particles according with the requirements of environmental protection regulations.

Drawings

FIG. 1 is a schematic structural diagram of a protective gas type metallic copper powder dryer according to a first embodiment of the present invention;

FIG. 2 is a schematic structural view of a protective gas type dryer for copper powder particles according to a second embodiment of the present invention;

FIG. 3 is a schematic structural view of a protective gas type dryer for copper powder particles according to a third embodiment of the present invention;

FIG. 4 is a schematic structural view of a protective gas type dryer for copper powder particles according to a fourth embodiment of the present invention;

FIG. 5 is a schematic structural view of a protective gas type dryer for copper powder particles according to example V of the present invention;

FIG. 6 is a schematic structural view of a protective gas type dryer for copper powder particles according to a sixth embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a protective gas type metallic copper powder dryer according to a seventh embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a shielding gas type dryer for copper powder particles according to an eighth embodiment of the present invention;

FIG. 9 is a schematic view showing a structure of a protective gas type dryer for copper powder particles according to example nine of the present invention;

FIG. 10 is a schematic structural view of a protective gas type dryer for copper powder particles according to a tenth embodiment of the present invention;

FIG. 11 is a schematic view showing a structure of a protective gas type dryer for copper metal powder particles according to an eleventh embodiment of the present invention;

wherein 101 a drying chamber; 102 a shielding gas inlet; 103 air outlet; 104 a pressure relief valve; 105 a buffer device; 106 a water outlet; 107 vacuum pressure reduction means;

201 shield gas inflow direction; 202 heating medium inlet and outlet; 203 a shielding gas inlet; 204 air outlet; 205 motor drives the spin device; 206 drying chamber inner gas discharge direction; 207 sealing the discharge hole; 208 feed port capping; 209 an insulating layer; 210 heating the media flowing layer; 211 a drying chamber;

301 direction of flow of shielding gas; 302 heating medium inlet and outlet; 303 a shielding gas inlet; 304 air outlet; 305 a manual spinning device; 306 the direction of gas discharge inside the drying chamber; 307, sealing a discharge hole; 308, closing the feed inlet; 309 an insulating layer; 310 heating the media flowing layer; 311 a drying chamber; 312 shaking the handle;

401 a drying chamber; 402 a shielding gas inlet; 403, an air outlet; 404 taking a material port; 405 a temperature controller; 406 resistance furnace;

501 shielding gas inflow direction; 502 heating medium inlet and outlet; 503 a shielding gas inlet; 504 pumping exhaust ports; 505 a rotary joint combination; 506 the direction of gas discharge inside the drying chamber; 507, sealing a discharge hole; 508 closing the feed inlet; 509 insulating layer; 510 heating the media flow layer; 511 a drying chamber; 512 electric stirring device;

601 a dry type electric heating pipe; 602 a temperature control device; 603 insulating layer; 604 a feeding port; 605 a removable cover; 606 air outlet (vacuum decompression air exhaust pipe orifice); 607 a shielding gas inlet; 608 discharge port; 609 adjustable foot; 610 shaking the handle; 611 manual stirring device;

701 dry type electric heating tubes; 702 a heat-conducting medium temperature control device; 703 heat-insulating layer; 704 a feeding port; 705 a removable closure; 706 air outlet (vacuum reduced pumping nozzle); 707 a shielding gas input port; 708 a discharge hole; 709 adjustable feet; 710 a speed regulating motor; 711 electric stirring device; 712 drying chamber temperature controller; 713 outlet gas temperature control device; 714 a liquid heat-conducting medium;

801 door sealing plates; 802 feeding and discharging ports; 803 a shielding gas inlet; 804 air outlet; 805 an insulating layer; 806 a drying chamber; 807 an electric heating tube; 808 a temperature control device; 809 a water outlet; 810 a drain switch;

901 a temperature control device; 902 shielding a gas inlet; 903 gas outlet; 904 insulating layers; 905 a drying chamber; 906 heating pipes; 907 a water outlet; 908 a drain switch; 909 an electric pump; 910 a heat transfer medium; a 911 alcohol lamp;

1001 electrical heating tube; 1002 heat-insulating layer; 1003 feeding port; 1004 a removable cover; 1005 gas outlet (vacuum decompression air exhaust pipe orifice); 1006 water outlet; 1007 adjustable feet; 1008 heating the medium; 1009 discharge port; 1010 a shielding gas inlet;

1101 a shielding gas inlet; 1102 air outlet; 1103 dry chamber; 1104 an induction cooker.

Detailed Description

Adopt the utility model discloses carry out dry method to metal powder, including following step:

(1) putting metal powder particles to be dried into a container provided with a heating device and/or a vacuum pressure reducing device;

(2) isolating the interior of the container from the outside air, and exhausting the gas inside the container;

(3) starting the heating device and/or the vacuum decompression device to heat the container and/or maintain the air pressure in the container to be negative pressure, so that the volatilizable substance and/or the thermally decomposable gasified substance in the container are changed into gas, and the generated gas is discharged from the container;

(4) stopping the heating device and/or the vacuum pressure reducing device, and continuously introducing protective gas into the container;

(5) the metal powder particles are removed from the container and packaged.

The heating means may be a separate heat source or a combination of a heat source and a heat transfer medium. When the heating device is a separate heat source, the heat source directly heats the outside and/or the inside of the container; when the heating device is a combination of a heat source and a heat transfer medium, the heated heat transfer medium is in direct contact with the outer wall of the container and/or heats the metal powder particles through the inside of the container through a pipeline. The heat transfer medium may be heated directly by a heat source or may be heated by a heat transfer medium that is otherwise heated by a heat source. Preferably, the heat source is fuel heating or electric heating or electromagnetic heating, and the heat transfer medium is liquid and/or gas. More preferably, the liquid heat transfer medium is water and/or glycerol and/or diathermic oil and/or molten salt and/or liquid metal; the gaseous heat transfer medium is water vapor and/or air.

The protective gas is a gas which can not generate chemical reaction with the metal powder particles in the drying cavity. Preferably, the shielding gas comprises one or more of argon, helium, nitrogen, neon, krypton and xenon.

Preferably, the shielding gas source is a compressed gas or a liquid gas in the shielding gas.

The invention mainly utilizes protective gas to isolate air from dried metal powder particles. Particularly, after the volatilizable substance and/or the thermal decomposition gasification substance are/is changed into gas by a heating device through a heating method, the oxidation reaction caused by the high temperature of the heated metal powder particles after contacting the air can be avoided. Meanwhile, protective gas is continuously introduced into the container after heating is finished, and the heat of the metal powder is absorbed by utilizing the heat absorption performance of the protective gas, so that the metal powder particles in the container can be cooled.

According to the fact that the boiling point of the same liquid is in direct proportion to the pressure of the gas, the volatile substances can be effectively promoted to be volatilized into gas to be separated from the metal powder particles by the heating method or the reduction of the gas pressure around the metal to be dried.

In the step (2), the gas in the container is discharged, the vacuum pressure reducing device may be used to pump the gas in the container to generate negative pressure in the cavity, or protective gas may be introduced into the container to discharge the air in the container, or both methods may be used simultaneously; when the two methods are used simultaneously, protective gas is firstly introduced into the container to exhaust the air in the container, and then the vacuum pressure reducing device is started to pump the gas in the container to generate negative pressure in the cavity.

Preferably, the vacuum decompression device is used for exhausting gas in the container to enable the negative pressure generated in the cavity of the container to be in a range of 0 to-0.1 MPa.

The air in the container is discharged before the particles to be dried are heated and evaporated, so that the phenomenon that air remains in the container, and the oxidation reaction of metal occurs in the heating process, can be effectively avoided.

The gas generated in the step (3) can be pumped out of the container through the vacuum decompression pumping device, and can also be driven away by introducing protective gas into the container.

In the step (5), the supply of the protective gas may be stopped before the metal powder particles are taken out from the container and packaged, or may be stopped after the metal powder particles are taken out from the container and packaged.

When the heating device is used for heating the container, in order to better judge the evaporation condition of the volatile substances in the container and/or the gasification condition of the thermally decomposable and gasified substances, the temperature detector is arranged to detect the temperature of the heat transfer medium of the heating device and/or the wall of the container and/or the gas in the container and/or the metal powder particles in the container and/or the gas passing through the gas outlet of the container so as to judge the drying condition in the container.

Preferably, the temperature detector is used for stopping the heating device when detecting that the temperature of the container wall and/or the metal powder particles in the container and/or the gas passing through the gas outlet of the container exceeds the boiling point under the corresponding gas pressure and continuously rises, and/or detecting that the temperature of the gas in the container and/or the gas passing through the gas outlet of the container suddenly drops, and/or adjusting the heat energy emitted by the heat source of the heating device when detecting that the heat transfer medium of the heating device deviates from the set evaporation temperature of the metal powder particles.

Since the volatilization of the material in the container and the decomposition and gasification reaction need to absorb heat energy, and the temperature of the liquid gasification is fixed under the condition that the gas pressure in the container is stable, the drying condition in the container can be judged by monitoring the temperature change of the metal particles or/and the gas in the container.

In order to ensure that the metal powder particles can be uniformly heated during heating and the dried metal powder particles are not easy to agglomerate, the container is also provided with a spinning and/or stirring device.

Preferably, the spinning and/or stirring device is turned on when the heating device is turned on in the step (3) to heat the container; and (5) continuously conveying protective gas to the container, simultaneously keeping starting the spinning and/or stirring device to uniformly cool the metal powder particles, and stopping the spinning and/or stirring device when the temperature of the metal powder particles is reduced to a set temperature value.

The technical solutions of the present invention will be described in detail below with reference to specific embodiments so that those skilled in the art can better understand and implement the technical solutions.

In the following examples and comparative examples, the copper alloy used is preferably a copper-tungsten alloy produced from a kelvin source alloy; the tin alloy used is preferably copper-tin alloy produced by Tianshui New materials Co; the used molten salt is preferably Changni brand heat-conducting molten salt; the used liquid metal is preferably liquid metal heat conducting paste produced in a Zhongxuan liquid state;

in addition to those enumerated above, those skilled in the art can select other products having similar properties to those enumerated above in the present invention according to routine selection, and can achieve the objects of the present invention.

Example one

Mixing the metal powder particles specified in the table 1 with clean water to obtain 20kg of metal powder particles to be dried, wherein the mixing ratio of the metal powder particles to the clean water is 19:1 in weight;

the used protective gas type metallic copper powder particle dryer has a structure shown in figure 1, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, and a material inlet sealing door plate is closed;

starting a vacuum decompression pump drainage device, keeping the negative pressure in a drying cavity at a value specified in table 1, and maintaining the temperature of metal powder particles to be dried at an evaporation temperature specified in table 1 for evaporation drying for 3 hours;

introducing protective gas specified in the table 1 into the drying cavity, shutting down the vacuum decompression pumping device after 10 minutes, and opening the air escape valve after 15 minutes;

stopping the input of the protective gas, opening a door sealing plate of the material inlet, and discharging metal powder particles for sealing and packaging;

after 24 hours, the metal powder particles contained in the sealed package were subjected to purity analysis using a method known in the industry (iodine method for determination of copper in copper concentrate, xiaoyu, zhahu, caoyongjie, spectral laboratory, vol.28 No.5, p2317-2319, EDTA complexation method for determination of tin content in tin-lead solder, victory, general 123, p18-20 in transportation engineering, research progress on spectrophotometry for determination of nickel, lyx, royal jelly, metallurgical analysis, 2009, 1 month, p 44-51), while observing the surface thereof using a microscope, and the analysis and observation results were recorded in table 2.

Example two

the used protective gas type metallic copper powder particle dryer has a structure shown in figure 2, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, a material inlet sealing door plate is closed, and a vacuum decompression pumping device is opened;

when the negative pressure in the drying cavity reaches the value specified in the table 1, starting the heating device and the spinning device, and maintaining the temperature of the metal powder particles to be dried at the evaporation temperature specified in the table 1 for evaporation drying for 5 hours;

introducing protective gas specified in the table 1 into the drying cavity, and shutting down the vacuum decompression pumping device after 10 minutes;

continuously introducing protective gas specified in the table 1 into the drying cavity, stopping the spinning device after the cooling time specified in the table 1 is reached, opening a door sealing plate of the material inlet, discharging metal powder particles for sealing and packaging, and then stopping the input of the protective gas;

after 24 hours the metal powder particles in the sealed package were subjected to purity analysis using methods well known in the art while observing their surface using a microscope, and the results of the analysis and observation are recorded in table 2.

EXAMPLE III

The process of example 2 was repeated using a shielding gas type copper powder particle dryer having a structure as shown in FIG. 3 according to the parameters shown in Table 1. The vacuum decompression pumping device is a liquid jet vacuum decompression device, the heating device is turned off when the temperature detector detects that the temperature of air in the drying cavity exceeds the evaporation temperature and continuously rises, and the spinning device is manual.

After the metal powder particles were dried for 24 hours, the purity of the hermetically packaged metal powder particles was analyzed by a method known in the art while observing the surfaces thereof using a microscope, and the analysis and observation results are recorded in table 2.

Example four

Mixing the metal powder particles specified in the table 1 with a 2wt% hydrochloric acid aqueous solution to obtain 20kg of metal powder particles to be dried, wherein the mixing ratio of the metal powder particles to the hydrochloric acid aqueous solution is 19:1 in weight;

the used protective gas type metallic copper powder particle dryer has a structure shown in figure 4, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, a door sealing plate of the material inlet is closed, and protective gas is introduced to discharge air in the cavity;

starting the heating device, keeping introducing protective gas into the drying cavity, and heating the drying cavity according to the heating temperature specified in the table 1;

starting a temperature detector, detecting the temperature of the gas at the gas outlet, and stopping the heating device after the temperature is detected to be changed from stable to suddenly reduced;

discharging metal powder particles from the gas outlet for sealed packaging after the cooling time specified in the table 1 is reached, and then stopping the input of protective gas;

EXAMPLE five

The process of example 2 was repeated using a shielding gas type copper powder particle dryer having a structure as shown in FIG. 5 according to the parameters shown in Table 1. Wherein, an electric self-rotating device and a stirring device are arranged at the same time.

EXAMPLE six

the used protective gas type metallic copper powder particle dryer has the structure shown in figure 6, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, protective gas is introduced to discharge air in the cavity, a material inlet sealing door plate is closed, and a vacuum decompression pumping device is opened;

when the negative pressure in the drying cavity reaches the value specified in the table 1, starting the heating device, stirring the manual stirrer to rotate slowly, and maintaining the temperature of the metal powder particles to be dried at the evaporation temperature specified in the table 1 for evaporation drying;

starting a temperature detector, detecting the temperature of a heat transfer medium of the heating device, and adjusting the heat energy of a heat source of the heating device when the detected temperature deviates from the evaporation temperature;

continuously introducing protective gas specified in the table 1 into the drying cavity, stopping stirring after the cooling time specified in the table 1 is reached, opening a door sealing plate of the material outlet, discharging metal powder particles for sealing and packaging, and then stopping the input of the protective gas;

EXAMPLE seven

the used protective gas type metallic copper powder particle dryer is structurally shown in figure 7, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, protective gas is introduced to discharge air in the cavity, a material inlet sealing door plate is closed, and a vacuum decompression pumping device is opened;

when the negative pressure in the drying cavity reaches the value specified in the table 1, starting the heating device and the electric stirring device, and maintaining the temperature of the metal powder particles to be dried at the evaporation temperature specified in the table 1 for evaporation drying;

starting a temperature detector, detecting the temperature of a heat transfer medium of the heating device and the temperature of the wall of the drying cavity, increasing the heat source heat energy of the heating device when the temperature of the heat transfer medium is detected to be lower than the evaporation temperature, and stopping the heating device when the temperature of the wall of the drying cavity is detected to be changed from stable to continuous rising;

Example eight

the used protective gas type metallic copper powder particle dryer has a structure shown in figure 8, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, a material inlet seal door plate is closed, a water outlet is opened to discharge redundant liquid in the drying cavity, a switch of the water outlet is closed, and protective gas is introduced to discharge air in the cavity;

starting a temperature detector, detecting the temperature of metal powder particles and gas in the drying cavity, and stopping the heating device after the temperature of the metal powder particles is detected to be changed from stable to continuous rising or the temperature of the gas in the drying cavity is suddenly reduced;

Example nine

the structure of the used protective gas type metallic copper powder particle dryer is shown in figure 9, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, a material inlet seal door plate is closed, a water outlet is opened to discharge redundant liquid in the drying cavity, a switch of the water outlet is closed, and protective gas is introduced to discharge air in the cavity;

starting a temperature detector, detecting the temperature of the gas in the drying cavity, and stopping an electric pump in the heating device for controlling the transmission of the heat transfer medium in the heat transfer medium pipeline after the temperature is detected to be changed from stable to suddenly reduced;

Example ten

the structure of the used protective gas type metallic copper powder particle dryer is shown in figure 10, a material inlet is opened, metallic powder particles to be dried are placed in a drying cavity, a water outlet is opened to discharge redundant liquid in the drying cavity, a switch of the water outlet is closed, protective gas is introduced to discharge air in the cavity, and a material inlet sealing door plate is closed;

starting the heating device, simultaneously starting the vacuum decompression pumping device to keep the negative pressure in the drying cavity at the value specified in the table 1, and maintaining the temperature of the metal powder particles to be dried at the evaporation temperature specified in the table 1 for evaporation drying for 2 hours;

starting a temperature detector, detecting the temperature of metal powder particles in the drying cavity, and stopping the heating device when the detected temperature exceeds the evaporation temperature and continuously rises;

continuously introducing protective gas specified in the table 1 into the drying cavity, stopping the spinning device and the stirring device after the cooling time specified in the table 1 is reached, opening a door sealing plate of the material taking-out port, discharging metal powder particles for sealing packaging, and then stopping the input of the protective gas;

EXAMPLE eleven

the structure of the used protective gas type metallic copper powder particle dryer is shown in fig. 11, metallic powder particles to be dried are placed into a drying cavity from a gas outlet and a protective gas inlet, and protective gas is introduced to discharge air in the cavity;

1 hour later, the heating device is shut down, metal powder particles are discharged from the gas outlet for sealed packaging after the cooling time specified in the table 1 is reached, and then the input of protective gas is stopped;

TABLE 1

Examples	Kinds of metal powder particles	Protective gas	Heat transfer medium	Negative pressure of drying chamber (Mpa)	Evaporation temperature (. degree.C.)	Cooling time (min)
							1	Copper (Cu)	Argon gas	-	-0.1	21	-
2	Copper (Cu)	Liquid nitrogen	Water, water vapor	-0.08	62	93
							3	Copper alloy	Neon gas	Heat conducting oil	-0.06	78	170
4	Copper (Cu)	Krypton gas	-	-0.03	91	212
							5	Copper (Cu)	Xenon gas	Glycerol	-0.01	98	230
6	Copper (Cu)	Nitrogen gas	Air (a)	-0.09	48	58
							7	Nickel (II)	Argon gas	Liquid metal	-0.07	71	152
8	Tin (Sn)	Nitrogen gas	-	-0.05	84	72
							9	Tin alloy	Liquid nitrogen	Water (W)	-0.04	88	113
10	Copper (Cu)	Nitrogen gas	Fused salt	-0.02	95	480
							11	Copper (Cu)	Liquid nitrogen	-	0	100	185

TABLE 2

Examples	Purity of Metal (%)	Appearance of the product	Examples	Purity of Metal (%)	Appearance of the product
						1	98.6	Slightly wet but still bright	7	99.9	Dry and bright
2	99.3	Dry and bright	8	99.8	Dry and bright
						3	99.5	Dry and bright	9	99.9	Dry and bright
4	99.5	Dry and bright	10	99.9	Dry and bright
						5	99.8	Dry and bright	11	97.3	Slightly wet but still bright
6	99.9	Dry and bright

Claims

1. A gas-shielded metal powder particle drying apparatus, comprising:

at least one gas outlet for exhausting gas inside the drying chamber;

2. A gas-shielded metal powder particle drying apparatus as claimed in claim 1, wherein: comprises a heating device for heating the drying cavity.

3. A gas-shielded metal powder particle drying apparatus as claimed in claim 2, wherein: the heating device comprises a heat source, a heat transfer medium, a pipeline and an electric pump, wherein the pipeline and the electric pump are used for conveying the heat transfer medium, and the heat transfer medium is liquid and/or gas and is in contact with the wall of the drying cavity and/or passes through the interior of the container through the pipeline.

4. A gas-shielded metal powder particle drying apparatus as claimed in claim 3, wherein: the temperature control device is used for controlling the temperature of the heat transfer medium of the heating device and/or the on/off of a heat source and/or the on/off of a heat transfer medium conveying electric pump.

5. A gas-shielded metal powder particle drying apparatus as claimed in claim 1, wherein: the drying cavity is provided with a spinning device and/or a stirring device, and the stirring device is arranged inside the drying cavity.

6. A gas-shielded metal powder particle drying apparatus as claimed in any one of claims 1 to 5, wherein: the air outlet pipeline is connected with at least one vacuum pressure reducing device.

7. A gas-protected apparatus for drying metal powder particles as claimed in claim 6, wherein: the pipeline that the gas outlet is connected with vacuum pressure reduction device is provided with at least one buffer device, the buffer device is a tank body provided with a gas inlet and a gas outlet, the gas inlet of the buffer device is connected with the gas outlet through a pipeline, and the gas outlet of the buffer device is connected with the vacuum pressure reduction device through a pipeline.