Method for preparing metal powder through gas short-distance flow reduction

Abstract

The embodiment of the invention discloses a method for preparing metal powder through gas short-distance flow reduction, which comprises the following steps: a plurality of reaction boats are sequentially and continuously arranged in a furnace tube of a continuous production device along the length direction of the furnace tube, and gas inlet parts and gas exhaust parts are respectively arranged on two sides of the reaction boats; one end of the gas inlet component is closed, the other end of the gas inlet component is communicated with a reaction gas source, and a plurality of first through holes at uniform intervals are formed in the side wall, close to the reaction boat, of the gas inlet component; the center positions of the first through holes are higher than the reaction boats, and one reaction boat at least corresponds to one first through hole; one end of the exhaust part is closed, the other end of the exhaust part is provided with an exhaust port, and the side wall, close to the reaction boat, of the exhaust part is provided with a plurality of second through holes at uniform intervals; the central positions of the second through holes are higher than the reaction boats, and one reaction boat at least corresponds to one second through hole; the first through hole corresponds to the second through hole in position; the flow distance of the reaction gas in the reaction zone above the materials is short, the chemical reaction conditions of other material reaction zones are not influenced, the concentration gradient of the generated gas is effectively reduced, the reaction rate is high, the product granularity is uniform, and the oxygen content is low.

Description

Technical Field

[0001] The invention belongs to the technical field of metal powder materials, and in particular relates to a method for preparing metal powder by gas short-distance flow reduction. Background Art

[0002] Gas-solid reduction to prepare metal powder is a common traditional metallurgical process. At present, the general method is to use a boat-shaped crucible to hold the material and push the boat in a horizontal furnace to prepare metal powder by gas-solid reaction. 2 Or CO reduction of refractory metal oxide powders to prepare metal powders, such as Mo, W, Co, Cu, Fe, La, etc.

[0003] The gas-solid reduction reaction boat is made of square open stainless steel or alumina. The reducing gas diffuses into the material to react with it, and the reducing gas and the generated gas products mix and flow out of the reactor. Usually, the thickness of the material needs to be controlled within 20 to 30 mm to avoid uneven powder due to the material layer being too thick and the gas cannot be fully diffused into the material. Taking the industrial hydrogen reduction of molybdenum trioxide as an example, first, hydrogen is added to the 30 mm thick MoO 3 Diffusion in the material layer, the intermediate product MoO is obtained at 450-600℃ 2 、Mo 4 O 11 and by-product water vapor; the intermediate product is hammered and sieved and then further reduced at 850-1050°C to finally obtain molybdenum powder. During the continuous production process, the reaction boat is intermittently and continuously advanced in the horizontal furnace, and hydrogen enters the reactor from one end of the horizontal furnace, flows through the molybdenum trioxide material layer in the same direction as the reaction boat in the reactor, contacts the material through diffusion and undergoes a chemical reaction, and the generated water vapor diffuses upward and leaves the reaction interface, and finally flows out from the other end of the reduction furnace with excess hydrogen. The reaction gas and the water vapor generated by the reaction need to flow through the entire furnace cavity from the inlet end of the reactor and then be discharged from the outlet end of the furnace body, passing through multiple reaction boats, and gradually reacting with the reaction raw material powder layer in the reaction boat. The hydrogen flow distance is long and the distribution in the reactor is uneven, resulting in a concentration gradient in the length direction of the reactor; at the same time, the water vapor generated by the reaction and the hydrogen are mixed and flow in the reactor for a long time, resulting in a slow reduction rate, uneven particle size of the product molybdenum powder, and high oxygen content. Summary of the invention

[0004] In view of this, some embodiments disclose a method for preparing metal powder by gas short-distance flow reduction, the method comprising:

[0005] In a furnace tube of a continuous production device, a plurality of reaction boats are arranged in sequence along the length direction of the furnace tube, and an air intake component and an exhaust component are arranged on both sides of the reaction boat respectively; one end of the air intake component is closed, and the other end is arranged to be connected with a reaction gas source, and a plurality of evenly spaced first through holes are arranged on the side wall of the air intake component close to the reaction boat; the center position of the first through hole is higher than the reaction boat, and one reaction boat corresponds to at least one first through hole; one end of the exhaust component is closed, and the other end is arranged with an exhaust port, and a plurality of evenly spaced second through holes are arranged on the side wall of the exhaust component close to the reaction boat; the center position of the second through hole is higher than the reaction boat, and one reaction boat corresponds to at least one second through hole; the positions of the first through hole and the second through hole correspond to each other;

[0006] After the reaction gas enters the air intake component, it is distributed inside the air intake component, then flows out from the multiple first through holes, enters the top of the reaction boat, diffuses into the reaction raw material powder placed in the reaction boat to react, and the water vapor and reaction gas generated by the reaction enter the exhaust component from the second through hole of the exhaust component and are discharged from the exhaust port.

[0007] Furthermore, in some embodiments of the method for preparing metal powder by short-distance gas flow reduction, the air intake component is an air intake bin having a length and height adapted to the furnace tube, and the exhaust component is an exhaust bin having a length and height adapted to the furnace tube.

[0008] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which multiple layers of reaction boats are arranged in the height direction of the furnace tube, and a gap is provided between two adjacent layers of reaction boats. The first through hole on the air inlet component is provided with multiple layers, corresponding to the multiple layers of reaction boats; the second through hole provided on the exhaust component is provided with multiple layers, corresponding to the multiple layers of reaction boats.

[0009] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which multiple rows of reaction boats are arranged in the length direction of the furnace tube, and at least one air inlet component and at least one exhaust component are arranged between the multiple rows of reaction boats.

[0010] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which two rows of reaction boats are arranged in the length direction of the furnace tube, an air intake component is arranged between the two rows of reaction boats, and two exhaust components are arranged, respectively located on both sides of the two rows of reaction boats.

[0011] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, wherein an air intake component consists of two air intake bins, the closed ends of the two air intake bins are arranged opposite to each other, and the other ends of the two air intake bins are respectively located at the two ends of a continuous production furnace tube, and are respectively arranged to be connected to a reaction gas source; an exhaust component consists of two exhaust bins, the closed ends of the two exhaust bins are arranged opposite to each other, and the other ends of the two exhaust bins are respectively located at the two ends of the furnace tube, and are respectively provided with exhaust ports.

[0012] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, wherein the air intake component is an air intake pipe, and multiple air intake pipes are provided, one end of each air intake pipe is connected to a reaction gas source, and the other end is provided as a first through hole; the exhaust component is an exhaust pipe, and multiple exhaust pipes are provided, one end of each exhaust pipe is provided as an exhaust port, and the other end is provided as a second through hole.

[0013] In the method for preparing metal powder by short-distance gas flow reduction disclosed in some embodiments, the exhaust port of the exhaust component is arranged to be connected to a negative pressure.

[0014] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which an air flow passage extending from a first through hole toward a second through hole is provided in a reaction raw material powder layer provided on a reaction boat, and the air flow passage is formed by reaction raw material powders placed at intervals and is located on the upper part of the reaction raw material powder layer.

[0015] In the method for preparing metal powder by short-distance gas flow reduction disclosed in some embodiments, the air intake component is an air intake pipe, and the exhaust component is an exhaust pipe.

[0016] The method for preparing metal powder by short-distance gas flow reduction disclosed in an embodiment of the present invention comprises an air intake component and an exhaust component arranged in a furnace tube of a continuous production device, wherein the air intake component and the exhaust component are distributed on two sides of a reaction boat, and the reaction gas introduced from the air intake component enters a reaction raw material layer in the reaction boat from the side of the reaction boat, flows out from the other side of the reaction boat after reacting in the raw material layer, and then enters the exhaust component and is finally discharged, and the reaction gas can quickly and evenly enter a plurality of reaction boats arranged in succession, and then can be quickly discharged from the exhaust component; the reaction gas has a short flow time in the reaction zone above the reaction raw material in the reaction boat, and does not affect the chemical reaction conditions in the reaction zones of other materials, thereby effectively reducing the concentration gradient of the generated gas, achieving a fast reaction rate, and obtaining a product with uniform particle size and low oxygen content, and has good application prospects in the technical field of preparing metal powder by flow reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the continuous production device of Example 1;

[0018] Figure 2 for Figure 1A top view of

[0019] Figure 3 This is a schematic diagram of the continuous production device composition of Example 2;

[0020] Figure 4 This is a schematic diagram of the composition of the continuous production device of Example 3;

[0021] Figure 5 This is a schematic diagram of the composition of the continuous production device of Example 4;

[0022] Figure 6 This is a schematic diagram of the composition of the continuous production device of Example 5;

[0023] Figure 7 This is a schematic diagram of the laying method of the raw material layer in the reaction boat of Example 6;

[0024] Figure 8 Schematic diagram of the laying method of the raw material layer in the reaction boat of Example 7.

[0025] Reference numerals

[0026] 1 Furnace tube 2 Reaction boat

[0027] 3 Intake components 4 Exhaust components

[0028] 31 first through hole 32 air inlet

[0029] 41 second through hole 42 exhaust port

[0030] 20 Reaction material layer 201 Air flow path DETAILED DESCRIPTION

[0031] The word "embodiment" used herein as an "exemplary" does not necessarily mean that any embodiment described is superior or better than other embodiments. Performance index tests in the embodiments of the present invention are performed using conventional test methods in the art unless otherwise specified. It should be understood that the terms described in the embodiments of the present invention are only used to describe specific implementation methods and are not intended to limit the contents disclosed in the embodiments of the present invention.

[0032] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as commonly understood by ordinary technicians in the technical field to which the embodiments of the present invention belong; other experimental methods and technical means not specifically specified in the embodiments of the present invention refer to experimental methods and technical means commonly used by ordinary technicians in the field.

[0033] The terms "substantially" and "approximately" used herein are used to describe small fluctuations. For example, they can refer to less than or equal to ±5%, such as less than or equal to ±2%, such as less than or equal to ±1%, such as less than or equal to ±0.5%, such as less than or equal to ±0.2%, such as less than or equal to ±0.1%, such as less than or equal to ±0.05%. The numerical data represented or presented in the range format herein are used only for convenience and brevity, and should therefore be flexibly interpreted as including not only the values ​​clearly listed as the limits of the range, but also all independent values ​​or sub-ranges contained in the range. For example, the numerical range of "1-5%" should be interpreted as including not only the clearly listed values ​​of 1% to 5%, but also the independent values ​​and sub-ranges within the range shown. Therefore, independent values ​​such as 2%, 3.5% and 4% and sub-ranges such as 1%-3%, 2%-4% and 3%-5% are included in this numerical range. This principle also applies to the range of only one numerical value. In addition, such an interpretation applies regardless of the width of the range or the characteristics described.

[0034] In this document, including in the claims, transitional words such as "comprises," "includes," "with," "having," "containing," "involving," "accommodating," etc. are understood to be open-ended, i.e., meaning "including but not limited to." Only the transitional words "consisting of" and "composed of" are closed transitional words.

[0035] In order to better illustrate the present invention, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

[0036] Under the premise of no conflict, the technical features disclosed in the embodiments of the present invention may be arbitrarily combined, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present invention.

[0037] In some embodiments, the method for preparing metal powder by gas short-distance flow reduction comprises:

[0038] In a furnace tube of a continuous production device, a plurality of reaction boats are arranged in sequence along the length direction of the furnace tube, and an air intake component and an exhaust component are arranged on both sides of the reaction boat respectively; one end of the air intake component is closed, and the other end is arranged to be connected with a reaction gas source, and a plurality of evenly spaced first through holes are arranged on the side wall of the air intake component close to the reaction boat; the center position of the first through hole is higher than the reaction boat, and one reaction boat corresponds to at least one first through hole; one end of the exhaust component is closed, and the other end is arranged with an exhaust port, and a plurality of evenly spaced second through holes are arranged on the side wall of the exhaust component close to the reaction boat; the center position of the second through hole is higher than the reaction boat, and one reaction boat corresponds to at least one second through hole; the number of the first through holes and the second through holes are the same, and the positions correspond to each other; after the reaction gas enters the air intake component, it is distributed in the air intake component, and then flows out from the plurality of first through holes, enters above the reaction boat, diffuses into the reaction raw material powder placed in the reaction boat for reaction, and the water vapor and the reaction gas generated by the reaction enter the exhaust component from the second through hole entering the exhaust component, and are discharged from the exhaust port.

[0039] Usually, in a furnace tube of a continuous production device, a plurality of reaction boats are arranged in rows along the length direction of the furnace tube or in the axial direction. A layer of reaction raw material powder is laid in the reaction boats. In order to realize continuous production, it is necessary to intermittently and continuously put new reaction boats into the chamber of the furnace tube from one end of the furnace tube. The reaction raw material powder in the reaction boat undergoes a reduction reaction in the furnace tube to generate metal powder. Then, the reaction boats that have completed the reaction are intermittently taken out from the other end of the furnace tube to collect the metal powder generated in the reaction boats. Generally, in the furnace chamber of the reaction furnace tube, a plurality of reaction boats are arranged in the middle area of ​​the furnace chamber and are arranged in sequence. It can be intermittently and continuously advanced; in the edge area between the reaction boat and the furnace tube wall, an air intake component and an exhaust component are arranged, which can neither hinder the movement of the reaction boat nor allow the reaction gas to flow out from the air intake component and quickly enter the reaction boat for reaction, and the tail gas generated by the reaction is quickly discharged from the exhaust component together with the reaction gas, so that the reaction gas and the tail gas, such as water vapor, have a short residence time in the reaction boat and can be quickly discharged, which greatly reduces the residence time of the reaction gas flow and the reaction tail gas in the furnace tube, reduces the concentration gradient of the reaction gas, improves the reaction uniformity, and can obtain a metal powder product with uniform particle size distribution.

[0040] Generally, the shape of the first through hole can be circular, oval, square, etc. In some embodiments, the first through hole is square, extending along the length direction of the furnace tube, forming a slit on the side wall of the gas inlet component, and the length of the slit is equivalent to a row of multiple consecutively arranged reaction boats, so as to provide reaction gas for the multiple consecutively arranged boats.

[0041] Generally, the second through hole may be in a circular, oval, square, etc. In some embodiments, the second through hole is in a square shape, extending along the length direction of the furnace tube, and forming a slit on the side wall of the exhaust component, the length of which is equivalent to a row of multiple consecutively arranged reaction boats, and the reaction tail gas and residual reaction gas generated by the multiple consecutively arranged boats can be discharged.

[0042] In the method for preparing metal powder by gas short-distance flow reduction disclosed in some embodiments, the air intake component is an air intake bin, which has a length and height adapted to the furnace tube, and the exhaust component is an exhaust bin, which has a length and height adapted to the furnace tube. Generally, the interior of the air intake bin has a certain internal volume, and the bulkhead forming the internal volume has a certain shape, which can be adapted to the length and height of the furnace tube so as to be placed in the furnace tube; in some embodiments, the furnace tube is a rectangular parallelepiped, and the chamber in the furnace tube is square, then the air intake bin is also set to a rectangular parallelepiped; generally, the interior of the exhaust bin has a certain internal volume, and the bulkhead forming the internal volume has a certain shape, which can be adapted to the length and height of the furnace tube so as to be placed in the furnace tube; in some embodiments, the furnace tube is a rectangular parallelepiped, and the chamber in the furnace tube is square, then the exhaust bin is also set to a rectangular parallelepiped.

[0043] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which multiple layers of reaction boats are arranged in the height direction of the furnace tube, and a gap is provided between two adjacent layers of reaction boats. The first through hole on the air inlet component is provided with multiple layers, corresponding to the multiple layers of reaction boats; the second through hole provided on the exhaust component is provided with multiple layers, corresponding to the multiple layers of reaction boats. Typically, multiple layers of reaction boats are provided in the furnace tube, so that more reaction raw materials can be placed in the furnace tube, thereby improving production efficiency; a gap is provided between two adjacent layers of reaction boats, so that the reaction gas can pass through the gap, which is beneficial for the reaction gas to enter the reaction raw material layer in the reaction boat, thereby improving reaction efficiency; at the same time, the first through holes provided on the air inlet component have a variety of heights, and the first through holes of the same height are arranged in a row to form a plurality of first through holes, so that each layer of reaction boat has a corresponding first through hole to provide reaction gas, thereby improving reaction uniformity; the second through holes provided on the exhaust component have a variety of heights, and the second through holes of the same height are arranged in a row to form a plurality of second through holes, so that each layer of reaction boat has a corresponding second through hole, thereby facilitating timely and rapid outflow of gas, thereby improving reaction uniformity, and obtaining a metal powder product with uniform particle size distribution.

[0044] Some embodiments disclose a method for preparing metal powder by gas short-distance flow reduction, in which multiple rows of reaction boats are arranged in the length direction of the furnace tube, and at least one air intake component or at least one exhaust component is arranged between the multiple rows of reaction boats at intervals, which can quickly provide reaction gas for each row of reaction boats, and timely discharge the tail gas and remaining reaction gas generated by the reaction. Generally, for different furnace tubes, a suitable number of reaction boats can be set according to the shape and size of the furnace tube inner cavity to improve production efficiency; in some embodiments, multiple rows of reaction boats are arranged in the length direction of the furnace tube, and the multiple rows of reaction boats are spaced at a suitable distance so that each row of reaction boats is provided with an air intake component and an exhaust component on both sides to quickly and efficiently provide reaction gas, and discharge reaction gas and reaction tail gas.

[0045] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which two rows of reaction boats are arranged in the length direction of the furnace tube, an air intake component is arranged between the two rows of reaction boats, and two exhaust components are arranged, respectively located on both sides of the two rows of reaction boats.

[0046] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, wherein an air intake component consists of two air intake bins, the closed ends of the two air intake bins are arranged opposite to each other, and the other ends of the two air intake bins are respectively located at the two ends of a continuous production furnace tube, and are respectively arranged to be connected to a reaction gas source; an exhaust component consists of two exhaust bins, the closed ends of the two exhaust bins are arranged opposite to each other, and the other ends of the two exhaust bins are respectively located at the two ends of the furnace tube, and are respectively provided with exhaust ports.

[0047] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, wherein the air intake component is an air intake pipe, and multiple air intake pipes are provided, one end of each air intake pipe is connected to a reaction gas source, and the other end is provided as a first through hole; the exhaust component is an exhaust pipe, and multiple exhaust pipes are provided, one end of each exhaust pipe is provided as an exhaust port, and the other end is provided as a second through hole.

[0048] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, wherein the air intake component is an air intake pipe, one end of which is closed, and the other end is connected to a reaction gas source, and a plurality of first through holes facing a reaction boat are arranged at intervals on the wall of the air intake pipe; the exhaust component is an exhaust pipe, one end of which is closed, and the other end is arranged as an exhaust port, and a plurality of second through holes facing the reaction boat are arranged at intervals on the exhaust pipe.

[0049] In the method for preparing metal powder by gas short-distance flow reduction disclosed in some embodiments, the exhaust port of the exhaust component is arranged to be connected to negative pressure. Generally, the exhaust port of the exhaust component is arranged to be connected to negative pressure, for example, an exhaust pump is arranged to be connected, so that a negative pressure of a certain pressure can be formed in the exhaust component, which is conducive to the reaction gas in the furnace tube of the exhaust component and the generated reaction tail gas to quickly enter the exhaust component and achieve rapid discharge.

[0050] Some embodiments disclose a method for preparing metal powder by short-distance gas flow reduction, in which an air flow passage extending from a first through hole toward a second through hole is provided in a reaction raw material powder layer provided on a reaction boat, and the air flow passage is formed by reaction raw material powders placed at intervals and is located on the upper part of the reaction raw material powder layer. In the furnace tube of the continuous production device, the reaction gas enters the furnace tube from the first through hole and leaves the furnace tube from the second through hole, that is, it flows from one side of the furnace tube to the other side along the diameter direction of the furnace tube. During the flow, it diffuses into the reaction raw material layer in the reaction boat, undergoes reduction reaction with the reaction raw materials, and generates metal powder. In order to increase the surface area of ​​the reaction raw material powder layer, improve the diffusion efficiency of the reaction gas into the reaction powder layer, and further facilitate the reaction gas to flow from one side to the other side of the furnace tube chamber, an airflow path consistent with the gas flow direction can be set in the reaction raw material powder layer. Usually, the airflow path is formed by laying the raw material powder in the reaction raw material layer in a certain manner. For example, when laying the raw material layer in the reaction boat, a groove of a certain depth is formed above the raw material layer, and the groove can be used as an airflow path. The reaction gas flows through the groove, which is conducive to entering the interior of the reaction raw material layer, and is also conducive to the rapid diffusion of the reaction tail gas generated in the reaction material layer into the groove, thereby improving the reaction efficiency.

[0051] In the same reaction boat, there can be multiple airflow passages arranged in parallel with each other.

[0052] The technical details are further illustrated below in conjunction with embodiments.

[0053] Example 1

[0054] The method for preparing metal powder by gas short-distance flow reduction disclosed in Example 1 utilizes Figure 1 , Figure 2 The continuous production device shown is carried out, and the preparation method comprises:

[0055] In a square furnace tube 1 of a continuous production device, a plurality of reaction boats 2 are arranged in sequence along the length direction of the furnace tube, and an air intake component 3 and an exhaust component 4 are respectively arranged on both sides of the reaction boat 2; the air intake component 3 is an air intake bin, one end of which is closed, and an air intake port 32 is arranged at the other end, and the air intake port 32 is further arranged to be connected with a reaction gas source, and a plurality of evenly spaced first through holes 31 are arranged on the side wall of the air intake component 3 close to the reaction boat 2, and the position of the first through holes 31 is higher than the reaction boat 2, and each first through hole 31 corresponds to a reaction boat 2; the exhaust component 4 is an exhaust bin, one end of which is closed, and an exhaust port 42 is arranged at the other end, and a plurality of evenly spaced second through holes 41 are arranged on the side wall of the exhaust component 4 close to the reaction boat 2; the position of the second through holes 41 is higher than the reaction boat 2, and each second through hole 41 corresponds to a reaction boat 2; the air intake port 32 of the air intake component 3 and the exhaust port 42 of the exhaust component 4 are located at the same end of the furnace tube 1;

[0056] After the reaction gas enters the air inlet component 3, it is distributed in the air inlet component 3, then flows out from the plurality of first through holes 31, enters the top of the reaction boat 2, diffuses into the reaction raw material powder placed in the reaction boat 2 to react, and the water vapor and reaction gas generated by the reaction enter the exhaust component 4 from the second through hole 41 entering the exhaust component 4, and are exhausted from the exhaust port 42;

[0057] Figure 1 , Figure 2 The direction of the arrow in the middle indicates the overall flow direction of the reaction gas and reaction exhaust gas.

[0058] Example 2

[0059] The method for preparing metal powder by gas short-distance flow reduction disclosed in Example 2 utilizes Figure 3 The continuous production device shown is used for the preparation method, and the preparation method is referred to Example 1;

[0060] Among them, in the square furnace tube 1 of the continuous production device, the air intake component 3 is two air intake bins, the closed ends of the two air intake bins correspond to each other, and are arranged in the middle position of the internal volume of the furnace tube 1. The other ends of the two air intake bins are provided with air intake ports 32, which are respectively located at the two end positions of the internal volume of the furnace tube 1, and are respectively connected to the reaction gas source, so that the reaction gas is introduced into the furnace tube 1 from both ends of the furnace tube 1 at the same time; the exhaust component 4 is two exhaust bins, the closed ends of the two exhaust bins correspond to each other, and are arranged in the middle position inside the volume of the furnace tube 1. The other ends of the two exhaust bins are provided with exhaust ports 42, which are respectively located at the two end positions of the internal volume of the furnace tube 1, so that the exhaust gas is discharged to the outside from both ends of the furnace tube 1.

[0061] Example 3

[0062] The method for preparing metal powder by gas short-distance flow reduction disclosed in Example 3 utilizes Figure 4The continuous production device shown is used for the preparation method, and the preparation method is referred to Example 1;

[0063] Among them, in the square furnace tube 1 of the continuous production device, the air intake component 3 is two air intake pipes, one end of the two air intake pipes is arranged at one end of the furnace tube 1 as an air intake port 32, and the other ends of the two air intake pipes 3 are arranged in the furnace tube 1 as first through holes 31, wherein the first through holes 31 of one air intake pipe correspond to multiple reaction boats 2; the exhaust component 4 is two exhaust pipes, one end of the two exhaust pipes is arranged at the end of the furnace tube 1 as an exhaust port 42, and the other ends of the two air intake pipes are arranged in the furnace tube 1 as second through holes 41.

[0064] Example 4

[0065] The method for preparing metal powder by gas short-distance flow reduction disclosed in Example 4 utilizes Figure 5 The continuous production device shown is used for the preparation method, and the preparation method is referred to Example 1;

[0066] Wherein, in a square furnace tube 1 of a continuous production device, two layers of reaction boats 2 are arranged along the height direction of the furnace tube, and an air intake component 3 and an exhaust component 4 are respectively arranged on both sides of the reaction boat 2; the air intake component 3 is an air intake bin, one end of which is closed, and an air intake port 32 is arranged at the other end, and the air intake port 32 is further arranged to be connected with a reaction gas source, and a plurality of evenly spaced first through holes 31 are arranged on the side wall of the air intake component 3 close to the reaction boat 2, and the plurality of first through holes 31 are arranged in two layers in the height direction of the furnace tube 1, respectively corresponding to one layer of the reaction boat 2; the exhaust component 4 is an exhaust bin, one end of which is closed, and an exhaust port 42 is arranged at the other end, and a plurality of evenly spaced second through holes 41 are arranged on the side wall of the exhaust component 4 close to the reaction boat 2; the plurality of second through holes 41 are arranged in two layers in the height direction of the furnace tube 1, respectively corresponding to one layer of the reaction boat 2;

[0067] Example 5

[0068] The method for preparing metal powder by gas short-distance flow reduction disclosed in Example 5 utilizes Figure 6 The continuous production device shown is used for the preparation method, and the preparation method is referred to Example 1;

[0069] In the square furnace tube 1 of the continuous production device, a plurality of reaction boats 2 are arranged in two layers and two rows in a continuous arrangement in the furnace tube 1;

[0070] An air intake component 3 is provided between the two rows of reaction boats 2, and first through holes 31 corresponding to the reaction boats 2 are provided on both sides of the air intake component 3; an exhaust component 4 is provided between the two rows of reaction boats 2 and the side wall of the furnace tube 1, and a second through hole 41 is provided on the side wall of each exhaust component 4 close to the reaction boat 2;

[0071] A gap is provided between the two layers of reaction boats 2 , and first through holes and second through holes corresponding thereto are provided respectively.

[0072] Example 6

[0073] In the method for preparing metal powder by gas short-distance flow reduction disclosed in Example 6, raw material powders are laid in a reaction boat, and a gas flow path is formed in the raw material powder layer; Figure 7 As shown, when the reaction raw material layer 20 is laid in the reaction boat, a groove of a certain depth is formed above the reaction raw material layer 20, and the extension direction of the groove is from the first through hole to the second through hole, which is consistent with the overall direction of the reaction gas flow above the reaction boat. The groove can be used as an airflow passage 201. The reaction gas flows through the groove, which is conducive to entering the interior of the reaction raw material layer, and is also conducive to the rapid diffusion of the reaction exhaust gas generated in the reaction material layer into the groove, thereby improving the reaction efficiency.

[0074] Example 7

[0075] In the method for preparing metal powder by gas short-distance flow reduction disclosed in Example 7, raw material powders are laid in a reaction boat, and a gas flow path is formed in the raw material powder layer; Figure 8 As shown, when the reaction raw material layer is laid in the reaction boat, a plurality of grooves of a certain depth are formed above the reaction raw material layer 20; the cross-section of the groove is trapezoidal, the plurality of grooves are parallel to each other, and the extension direction is from the first through hole to the second through hole, which is consistent with the overall direction of the reaction gas flow above the reaction boat, and the groove can be used as an airflow passage 201; the cross-section of the reaction raw material layer including the plurality of airflow passages 201 is serrated as a whole, and when the reaction gas flows through the airflow passage of the serrated reaction raw material layer, it is beneficial for the reaction gas to quickly enter the interior of the reaction raw material layer, and it is also beneficial for the reaction exhaust gas generated in the reaction material layer to quickly diffuse into the airflow passage, thereby improving the reaction efficiency.

[0076] The method for preparing metal powder by short-distance gas flow reduction disclosed in an embodiment of the present invention comprises an air intake component and an exhaust component arranged in a furnace tube of a continuous production device, wherein the air intake component and the exhaust component are distributed on two sides of a reaction boat, and the reaction gas introduced from the air intake component enters a reaction raw material layer in the reaction boat from the side of the reaction boat, flows out from the other side of the reaction boat after reacting in the raw material layer, and then enters the exhaust component and is finally discharged, the reaction gas can quickly and evenly enter a plurality of reaction boats arranged in succession, and then can be quickly discharged from the exhaust component, the flow time in the reaction zone above the reaction raw material layer in the reaction boat is short, and does not affect the chemical reaction conditions in the reaction zones of other materials, effectively reduces the concentration gradient of the generated gas, has a fast reaction rate, and has a uniform particle size and a low oxygen content. The method has good application prospects in the technical field of preparing metal powder by flow reduction.

[0077] The technical solutions disclosed in the embodiments of the present invention and the technical details disclosed in the embodiments are merely illustrative of the inventive concept of the present invention and do not constitute a limitation on the technical solutions of the embodiments of the present invention. Any conventional changes, replacements or combinations of the technical details disclosed in the embodiments of the present invention have the same inventive concept as the present invention and are within the protection scope of the claims of the present invention.

Claims

1. A method for preparing metal powder by gas short-distance flow reduction, characterized in that: include: In a furnace tube of a continuous production device, a plurality of reaction boats are sequentially and continuously arranged along the length direction of the furnace tube, and an air intake component and an exhaust component are respectively arranged on both sides of the reaction boat; one end of the air intake component is closed, and the other end is arranged to be connected with a reaction gas source, and a plurality of evenly spaced first through holes are arranged on the side wall of the air intake component close to the reaction boat; the center position of the first through hole is higher than the reaction boat, and one reaction boat corresponds to at least one first through hole; one end of the exhaust component is closed, and the other end is arranged with an exhaust port, and a plurality of evenly spaced second through holes are arranged on the side wall of the exhaust component close to the reaction boat; the center position of the second through hole is higher than the reaction boat, and one reaction boat corresponds to at least one second through hole; the positions of the first through hole and the second through hole correspond to each other; After the reaction gas enters the air intake component, it is distributed inside the air intake component, then flows out from the multiple first through holes, enters the top of the reaction boat, diffuses into the reaction raw material powder placed in the reaction boat to react, and the water vapor and reaction gas generated by the reaction enter the exhaust component from the second through hole of the exhaust component and are discharged from the exhaust port.

2. The method for preparing metal powder by gas short-distance flow reduction according to claim 1, characterized in that: The air intake component is an air intake bin having a length and a height adapted to the furnace pipe, and the exhaust component is an exhaust bin having a length and a height adapted to the furnace pipe.

3. The method for preparing metal powder by gas short-distance flow reduction according to claim 2, characterized in that: Multiple layers of reaction boats are arranged in the height direction of the furnace tube, and a gap is arranged between two adjacent layers of reaction boats. The first through holes on the air inlet component are arranged in multiple layers, corresponding to the multiple layers of reaction boats; the second through holes on the exhaust component are arranged in multiple layers, corresponding to the multiple layers of reaction boats.

4. The method for preparing metal powder by gas short-distance flow reduction according to claim 2, characterized in that: A plurality of rows of reaction boats are arranged in the length direction of the furnace tube, and the at least one air inlet component and the at least one exhaust component are arranged between the plurality of rows of reaction boats at intervals.

5. The method for preparing metal powder by gas short-distance flow reduction according to claim 4, characterized in that: Two rows of reaction boats are arranged in the length direction of the furnace tube, the one air intake component is arranged between the two rows of reaction boats, and two exhaust components are arranged, respectively located on both sides of the two rows of reaction boats.

6. The method for preparing metal powder by gas short-distance flow reduction according to claim 1, characterized in that: The air intake component consists of two air intake bins, the closed ends of the two air intake bins are arranged opposite to each other, and the other ends of the two air intake bins are respectively located at the two ends of the continuous production furnace tube, and are respectively arranged to be connected to the reaction gas source; the exhaust component consists of two exhaust bins, the closed ends of the two exhaust bins are arranged opposite to each other, and the other ends of the two exhaust bins are located at the two ends of the furnace tube, and are respectively provided with exhaust ports.

7. The method for preparing metal powder by gas short-distance flow reduction according to claim 1, characterized in that: The air intake component is an air intake pipe, and there are multiple air intake pipes. One end of each air intake pipe is connected to the reaction gas source, and the other end is set as a first through hole; the exhaust component is an exhaust pipe, and there are multiple exhaust pipes. One end of each exhaust pipe is set as an exhaust port, and the other end is set as a second through hole.

8. The method for preparing metal powder by gas short-distance flow reduction according to claim 1, characterized in that: The exhaust port of the exhaust component is arranged to be in communication with the negative pressure.

9. The method for preparing metal powder by gas short-distance flow reduction according to claim 1, characterized in that: An airflow passage extending from the first through hole to the second through hole is arranged in the reaction raw material powder layer arranged on the reaction boat. The airflow passage is formed by the reaction raw material powders arranged at intervals and is located on the upper part of the reaction raw material powder layer.

10. The method for preparing metal powder by gas short-distance flow reduction according to claim 1, characterized in that: The air intake component is an air intake pipe, and the exhaust component is an exhaust pipe.

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