Superfine tungsten powder reduction rotary furnace

Abstract

The utility model relates to the technical field of powder metallurgy, in particular to a superfine tungsten powder reduction rotary furnace which mainly comprises a furnace body, a heating wire, a support, a furnace tube component and a detection component. The design of the spiral lifting plate is optimized in different reaction stages, the reduction efficiency is improved, the oxygen content of the tungsten powder is reduced, the spiral lifting plate is not arranged in the cooling section, the rotation resistance is reduced, then the power consumption of the motor is reduced, the tungsten powder is cooled by arranging reverse hydrogen, the reverse hydrogen is heated and transmitted to the deoxidation section, and the oxygen content of the tungsten powder is reduced. The energy is further saved, the tungsten powder is prevented from growing up, the laser particle size analyzer is arranged to detect the particle size of the tungsten powder in real time, the process is rapidly adjusted, quality deviation is avoided, the recovery rate of the tungsten powder is improved, and the situations that the powder particle size distribution is wide and deoxidation is not thorough are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy, in particular to an ultrafine tungsten powder reduction rotary furnace. Background Art

[0002] Ultrafine tungsten powder is primarily used to produce ultrafine tungsten carbide, the primary raw material for producing ultrafine cemented carbides such as cutting tools and rods. Its performance directly impacts the service life of the end product. With the development of industry, the requirements for end products are becoming increasingly stringent. To adapt to this market, the requirements for raw materials are also becoming increasingly stringent, such as requiring tungsten powder to have a narrow particle size distribution and low oxygen content.

[0003] The mainstream production method for tungsten powder is to reduce tungsten oxide with hydrogen in a rotary furnace. During the production process, the material moves along a certain angle from the feed to the discharge end as the furnace rotates. By adjusting the rotation speed, temperature, and feed rate, different grades of tungsten powder can be produced.

[0004] In the production of tungsten powder, quality control is generally carried out by taking pre-furnace samples and small samples. The detection cycle is generally more than 2 hours. If deviation is found, adjustments are made, and then sampling is carried out to verify the quality. This leads to a slow response of the production process and uneven distribution of powder particle size. Although the average particle size meets the requirements after batching, the particle size distribution is wide. At the same time, traditional rotary kilns also have certain structural defects. For example, the lifting plate in the furnace tube is usually a single structure running through the entire length, resulting in the inability to target the material in the pre-reduction, main reduction and deoxidation stages, low reaction efficiency and high energy consumption. The single-furnace-tube rotary furnace also has a low tungsten powder recovery rate. In some rotary furnace patents, a double-furnace-tube design is used, and a lifting plate is arranged inside the furnace tube, but the lifting plates are evenly distributed throughout the process, and the process requirements of different reaction stages are not considered, which further leads to a wide particle size distribution and incomplete deoxidation of the produced powder. Utility Model Content

[0005] The purpose of the utility model is to provide a rotary kiln for reducing ultrafine tungsten powder to solve the problems raised by the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An ultrafine tungsten powder reduction rotary kiln, comprising:

[0008] The furnace body has a feed port at its head and a discharge port at its tail;

[0009] The heating wire is arranged in the furnace body and is independently arranged in multiple sections, and the multiple independent heating wires are used to provide heat;

[0010] A bracket is arranged at the bottom of the furnace body;

[0011] The furnace tube component is arranged in the furnace body and is provided with a spiral material lifting plate;

[0012] The detection component is set at the discharge port to monitor the particle size of tungsten powder.

[0013] Preferably, the furnace body is composed of a heating section and a cooling section from the feed port to the discharge port, and the length ratio of the cooling section to the heating section is (3~4):(7~8); the heating section is composed of a pre-reduction section, a main reduction section and a deoxidation section in sequence; the pre-reduction section, the main reduction section and the deoxidation section have the same length, and the cooling section is from the tail of the heating section to the discharge port. The hydrogen of the pre-reduction section and the main reduction section is introduced from the feed port, and the hydrogen of the deoxidation section and the cooling section is introduced from the discharge port.

[0014] Preferably, the furnace tube component includes an outer furnace tube and an inner furnace tube, the outer furnace tube is arranged to pass through the furnace body, the inner furnace tube is located inside the outer furnace tube, and the inner furnace tube is located at the position from the feed inlet to the main reduction section.

[0015] Preferably, the gap between the inner wall of the outer furnace tube and the outer wall of the inner furnace tube is 10-20 cm.

[0016] Preferably, the heating wire is arranged on the outer wall of the outer furnace tube, and the spiral material lifting plate is arranged on the inner wall of the outer furnace tube.

[0017] Preferably, the pitch of the spiral lifting plate provided in the pre-reduction section is 60-100 mm, the blades of the spiral lifting plate are evenly and discontinuously arranged along the spiral direction, and the portion without blades accounts for 20-40%.

[0018] Preferably, the pitch of the spiral lifting plate provided in the main reduction section is 100-140 mm, the blades of the spiral lifting plate are evenly and discontinuously arranged along the spiral direction, and the portion without blades accounts for 45-55%.

[0019] Preferably, the pitch of the spiral lifting plate provided in the deoxidation section is 180-220 mm, and the blades of the spiral lifting plate are continuously arranged along the spiral direction.

[0020] Preferably, a height adjustment device is provided in the bracket for adjusting the inclination angle of the furnace body.

[0021] Preferably, the detection component includes a laser particle size analyzer, and the laser particle size analyzer is arranged at the discharge port at the rear of the furnace body.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] The utility model optimizes the design of the spiral lifting plate in different reaction stages, thereby improving the reduction efficiency and reducing the oxygen content of the tungsten powder. The pitch of the spiral lifting plate is increased in the deoxidation section, and the spiral lifting plate is not provided in the cooling section, thereby reducing the rotational resistance and thus reducing the power consumption of the motor. The tungsten powder is cooled by providing reverse hydrogen, which is also heated and transmitted to the deoxidation section, thereby further saving energy and avoiding the growth of the tungsten powder. A laser particle size analyzer is provided to detect the particle size of the tungsten powder in real time, thereby realizing a rapid adjustment process, avoiding quality deviation, improving the recovery rate of the tungsten powder, and avoiding a wide distribution of powder particle size and incomplete deoxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present utility model.

[0025] In the figure: 1. Furnace body; 2. Outer furnace tube; 3. Inner furnace tube; 4. Bracket; 5. Pre-reduction section; 6. Main reduction section; 7. Heating wire; 8. Deoxidation section; 9. Cooling section; 10. Laser particle size analyzer. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0028] like Figure 1 As shown, the present application provides an ultrafine tungsten powder reduction rotary furnace, comprising: a furnace body 1, a feed port being provided at its head, and a discharge port being provided at its tail; a heating wire 7 being provided in the furnace body 1 and being independently provided in multiple sections, and the multiple independent heating wires 7 are used to provide heat; a bracket 4, the bracket 4 being provided at the bottom of the furnace body 1; a furnace tube component being provided in the furnace body 1, and a spiral lifting plate being provided therein; a detection component being provided at the discharge port, and being used to monitor the particle size of the tungsten powder.

[0029] The temperature of the multiple independent heating wires 7 is adjustable, which can achieve precise adjustment of the temperature required for different reaction stages and different brands.

[0030] Specifically, such as Figure 1As shown, the furnace body 1 is composed of a heating section and a cooling section from the feed port to the discharge port, and the length ratio of the cooling section to the heating section is (3~4):(7~8); the heating section is composed of a pre-reduction section 5, a main reduction section 6 and a deoxidation section 8 in sequence; the pre-reduction section 5, the main reduction section 6 and the deoxidation section 8 are of the same length, and the tail of the heating section to the discharge port is a cooling section 9, the hydrogen of the pre-reduction section 5 and the main reduction section 6 is introduced from the feed port, and the hydrogen of the deoxidation section 8 and the cooling section 9 is introduced from the discharge port.

[0031] The hydrogen from the pre-reduction section 5 and the main reduction section 6 is introduced from the feed port, which is called forward hydrogen. The hydrogen from the deoxidation section 8 and the cooling section 9 is introduced from the discharge port, which is called reverse hydrogen. The reverse hydrogen has a cooling effect on the material. At the same time, the hydrogen is heated after passing through the cooling section 9, reducing the electric heating load at the deoxidation section 8.

[0032] Specifically, such as Figure 1 As shown, the furnace tube components include an outer furnace tube 2 and an inner furnace tube 3. The outer furnace tube 2 is arranged to pass through the furnace body 1, and the inner furnace tube 3 is located inside the outer furnace tube 2, and the inner furnace tube 3 is located at the position from the feed inlet to the main reduction section 6; the gap between the inner wall of the outer furnace tube 2 and the outer wall of the inner furnace tube 3 is 10-20 cm; the heating wire 7 is arranged on the outer wall of the outer furnace tube 2, and the spiral lifting plate is arranged on the inner wall of the outer furnace tube 2.

[0033] Specifically, such as Figure 1 As shown, the pitch of the spiral lifting plate provided in the pre-reduction section 5 is 60-100 mm, the blades of the spiral lifting plate are evenly and discontinuously arranged along the spiral direction, and the portion without blades accounts for 20-40%.

[0034] The design of the spiral lifting plate in the pre-reduction section 5 can accelerate the dispersion of materials and the low-temperature pre-reduction of WO3 to WO2.

[0035] Specifically, such as Figure 1 As shown, the pitch of the spiral lifting plate arranged in the main reduction section 6 is 100-140mm, the blades of the spiral lifting plate are evenly and intermittently arranged along the spiral direction, and the proportion of the part without blades is 45-55% (that is, the length of the part of the spiral lifting plate without blades along the spiral direction accounts for 45-55% of the length of the spiral lifting plate blades along the spiral direction, and the length of the spiral lifting plate blades along the spiral direction is the sum of the length of the part of the spiral lifting plate without blades along the spiral direction and the length of the part of the spiral lifting plate with blades along the spiral direction).

[0036] The design of the spiral lifting plate in the main reduction section 6 can balance the reaction time and powder refinement.

[0037] Specifically, such as Figure 1As shown, the pitch of the spiral lifting plate provided in the deoxidation section 8 is 180-220 mm, and the blades of the spiral lifting plate are continuously arranged along the spiral direction.

[0038] The design of the spiral lifting plate in the deoxidation section 8 can reduce powder flying and ensure deep deoxidation.

[0039] Specifically, such as Figure 1 As shown, a height adjustment device is provided in the bracket 4 for adjusting the inclination angle of the furnace body 1 .

[0040] The furnace body 1 can achieve two-stage height adjustment by adjusting the bracket, thereby achieving the tilt requirement of 0-8°, more specifically, achieving the tilt requirement of 2-6°. The feed port end of the furnace body is higher than the discharge port end, that is, the furnace body is tilted downward, and the angle between the axis from the feed port to the discharge port and the horizontal plane is 2-6°.

[0041] Specifically, such as Figure 1 As shown, the detection component includes a laser particle size analyzer 10 , which is arranged at the discharge port at the rear of the furnace body 1 .

[0042] The laser particle size analyzer 10 monitors the changes in the particle size of the tungsten powder at any time and provides feedback. By setting the upper and lower limits of the particle size, the laser particle size analyzer 10 issues an early warning for deviations beyond the upper and lower limits, thereby achieving real-time and rapid adjustments.

[0043] The present application optimizes the design of the spiral lifting plate through different reaction stages, thereby improving the reduction efficiency and reducing the oxygen content of the tungsten powder. The pitch of the spiral lifting plate is increased in the deoxidation section 8, and the spiral lifting plate is not provided in the cooling section 9, thereby reducing the rotational resistance and thus reducing the power consumption of the motor. The tungsten powder is cooled by providing reverse hydrogen, which is also heated and transmitted to the deoxidation section 8, thereby further saving energy and avoiding the growth of the tungsten powder. A laser particle size analyzer 10 is provided to detect the particle size of the tungsten powder in real time, thereby realizing rapid process adjustment and avoiding quality deviation.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative; within the spirit of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0045] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A rotary kiln for reducing ultrafine tungsten powder, characterized in that: include: A furnace body (1) is provided with a feed inlet at its head and a discharge outlet at its tail; A heating wire (7) is arranged in the furnace body (1) and is independently arranged in multiple sections. The multiple sections of independent heating wire (7) are used to provide heat; A bracket (4), the bracket (4) being arranged at the bottom of the furnace body (1); A furnace tube component is arranged in the furnace body (1), and a spiral material lifting plate is arranged therein; The detection component is arranged at the discharge port and is used to monitor the particle size of the tungsten powder.

2. The ultrafine tungsten powder reduction rotary kiln according to claim 1, characterized in that: The furnace body (1) is composed of a heating section and a cooling section from the feed port to the discharge port, and the length ratio of the cooling section to the heating section is (3~4):(7~8); the heating section is composed of a pre-reduction section (5), a main reduction section (6) and a deoxidation section (8) in sequence; the pre-reduction section (5), the main reduction section (6) and the deoxidation section (8) are of the same length, and the cooling section (9) is formed from the tail of the heating section to the discharge port, and the hydrogen of the pre-reduction section (5) and the main reduction section (6) is introduced from the feed port, and the hydrogen of the deoxidation section (8) and the cooling section (9) is introduced from the discharge port.

3. The ultrafine tungsten powder reduction rotary kiln according to claim 2, characterized in that: The furnace tube component comprises an outer furnace tube (2) and an inner furnace tube (3), wherein the outer furnace tube (2) is arranged to penetrate the furnace body (1), and the inner furnace tube (3) is located inside the outer furnace tube (2), and the inner furnace tube (3) is located at a position from the feed port to the main reduction section (6).

4. The ultrafine tungsten powder reduction rotary kiln according to claim 3, characterized in that: The gap between the inner wall of the outer furnace tube (2) and the outer wall of the inner furnace tube (3) is 10-20 cm.

5. The ultrafine tungsten powder reduction rotary kiln according to claim 3, characterized in that: The heating wire (7) is arranged on the outer wall of the outer furnace tube (2), and the spiral material raising plate is arranged on the inner wall of the outer furnace tube (2).

6. The ultrafine tungsten powder reduction rotary kiln according to claim 5, characterized in that: The pitch of the spiral lifting plate provided in the pre-reduction section (5) is 60-100 mm, and the blades of the spiral lifting plate are evenly and discontinuously arranged along the spiral direction, and the portion without blades accounts for 20-40%.

7. The ultrafine tungsten powder reduction rotary kiln according to claim 5, characterized in that: The pitch of the spiral lifting plate provided in the main reduction section (6) is 100-140 mm, and the blades of the spiral lifting plate are evenly and discontinuously arranged along the spiral direction, and the portion without blades accounts for 45-55%.

8. The ultrafine tungsten powder reduction rotary kiln according to claim 5, characterized in that: The pitch of the spiral lifting plate provided in the deoxidation section (8) is 180-220 mm, and the blades of the spiral lifting plate are continuously arranged along the spiral direction.

9. The ultrafine tungsten powder reduction rotary kiln according to claim 1, characterized in that: A height adjustment device is provided in the bracket (4) for adjusting the inclination angle of the furnace body (1).

10. The ultrafine tungsten powder reduction rotary kiln according to claim 1, characterized in that: The detection component comprises a laser particle size analyzer (10), and the laser particle size analyzer (10) is arranged at the discharge port at the rear of the furnace body (1).

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