Flash furnace feeding device and mixing method

Abstract

The invention discloses a flash furnace feeding device and a mixing method, the device comprises a mixing box, a pneumatic chute, a soot blanking chute and a stirring device, concentrate, a flux and soot are fully mixed through multiple layers before entering the furnace, the problem of uneven material component distribution in a traditional mixing process is solved, and the mixing efficiency is improved. The device can realize uniform components when materials enter a reaction tower and ensure that the distribution form of the materials entering the reaction tower is coaxial and concentric with a concentrate nozzle, so that the reaction intensities at the same height in the tower are consistent, the reaction heat distribution is more uniform, and the phenomenon that the local thermal load is too high or too low is avoided. According to the method, the service life of the reaction tower can be prolonged, the maintenance cost can be reduced, meanwhile, the efficiency of the smelting process and the product quality can be improved, and the requirements of modern smelting for high efficiency, energy conservation, safety and environmental protection are met.

Description

Technical Field

[0001] The present invention relates to the technical field of flash furnace mixing, and more particularly to a flash furnace feeding device and a mixing method. Background Art

[0002] The flash smelting process is widely used in the smelting of non-ferrous metals such as copper and nickel. Its raw materials mainly include concentrate, flux and fly ash. The concentrate and flux are usually mixed in the batching system to form a mixed ore, while the fly ash is added to the reaction tower together with the mixed ore through the concentrate nozzle to achieve a rapid reaction between the material and the oxidizing gas.

[0003] In traditional flash smelting processes, fly ash and mixed ore are added directly to the reaction tower at the concentrate nozzle. Inadequate mixing of the incoming materials results in uneven distribution of material composition within the tower, leading to significant variations in reaction levels and heat loads in different areas of the tower. This unevenness can lead to uneven slagging and erosion of the tower walls, creating weak areas in the tower over long-term production, reducing the tower's service life and increasing equipment operating risks and maintenance costs. Furthermore, due to the limited installation space available for the original equipment and the compact on-site layout, the required feeding device and mixing method required a small footprint, facilitating on-site installation.

[0004] Therefore, it is necessary to provide a flash furnace charging device and mixing method that can improve mixing uniformity, has a simple structure, occupies a small area and is easy to operate. Summary of the Invention

[0005] In view of this, the present invention provides a flash furnace charging device comprising: a mixing box, a pneumatic chute, a fly ash discharge chute and a stirring device;

[0006] The mixing box is in a polyhedral shape and includes a top surface and a bottom surface arranged opposite to each other in the vertical direction and a side surface connecting the top surface and the bottom surface; the mixing box extends in the vertical direction;

[0007] The pneumatic chute is arranged on the bracket, and the pneumatic chute includes a first-stage pneumatic chute, a second-stage pneumatic chute and a third-stage pneumatic chute arranged on the side of the mixing box. The first-stage pneumatic chute includes an inlet and an outlet arranged relatively along the extension direction of the first-stage pneumatic chute, the first-stage pneumatic chute passes through the side of the mixing box and the outlet of the first-stage pneumatic chute is arranged in the mixing box; the structure of the second-stage pneumatic chute is the same as that of the first-stage pneumatic chute; the extension direction of the first-stage pneumatic chute and the extension direction of the second-stage pneumatic chute are both opposite to the left and right directions. The pneumatic chute has an angle of 5° to 25°, and the outlet of the first pneumatic chute and the outlet of the second pneumatic chute form an angle of 10° to 50°; the distance between the outlet of the first pneumatic chute and the outlet of the second pneumatic chute in the vertical direction is 0.1m to 0.5m; the three-stage pneumatic chute includes an inlet and an outlet arranged opposite to each other in the left and right directions, the three-stage pneumatic chute vertically penetrates the side of the mixing box, and the inlet of the three-stage pneumatic chute is arranged in the mixing box; the outlet of the three-stage pneumatic chute is connected to the concentrate nozzle;

[0008] The ash discharge chute extends in the vertical direction and passes through the top surface of the mixing box. In the vertical direction, the outlet of the ash discharge chute is located on the central axis between the outlet of the first stage pneumatic chute and the outlet of the second stage pneumatic chute.

[0009] The stirring device is an electric propeller, and the stirring device includes a stirring rod and a stirring head. The stirring rod includes a fixed rod extending in the front-to-back direction and a connecting rod perpendicular to the fixed rod and extending in the up-down direction. The fixed rod passes through the side of the mixing box and the connecting rod is arranged in the mixing box. Along the up-down direction, the connection between the connecting rod and the fixed rod overlaps with the center of the bottom surface of the mixing box at the orthographic projection of the bottom surface of the mixing box; the stirring head is connected to the free end of the connecting rod, and the stirring head includes at least two blades, the angle between the blades is 30° to 60°, and along the diameter direction of the mixing box, the length of the blade is 0.8 times to 1 times the extreme value distance of the mixing box.

[0010] Optionally, air holes are evenly arranged on the outer edge of the bottom of the mixing box, and the air holes penetrate the bottom of the mixing box along the left and right directions, and the air holes are circular holes.

[0011] Optionally, a fluidized air device is also included, and the fluidized air device includes an air outlet, which is connected to the air hole and is circular.

[0012] Optionally, the inner wall of the pneumatic chute is coated with a wear-resistant coating, the material of the wear-resistant coating is a ceramic coating or an alloy coating, and the thickness of the wear-resistant coating is 0.5 mm to 2 mm.

[0013] The outer wall of the mixing box is provided with a heat insulation layer. The material of the heat insulation layer is ceramic fiber or aluminum silicate fiber. The thickness of the heat insulation layer is 20mm to 50mm.

[0014] On the other hand, the present invention also provides a mixing method applicable to the aforementioned flash furnace charging device, comprising the steps of:

[0015] The concentrate is transported to the mixing box through the first and second pneumatic chutes respectively;

[0016] The ash is transported to the mixing box through the ash discharge chute;

[0017] operating a stirring device and a fluidizing air device to mix the concentrate with the fly ash to obtain a mixed material;

[0018] The mixed material is transported to the concentrate nozzle through a three-section pneumatic chute.

[0019] Optionally, the flow rate of fluidized air generated by the fluidized air equipment is 5m 3 / h to 50m 3 / h.

[0020] Compared with the prior art, the flash furnace charging device and mixing method provided by the present invention achieve at least the following beneficial effects:

[0021] The present invention provides a flash furnace feeding device and mixing method. By optimizing the design of the feeding device, the concentrate, flux and fly ash are fully mixed in multiple sections before entering the furnace, thereby solving the problem of uneven distribution of material components in the traditional mixing process. The feeding device has the characteristics of simple structure, small footprint, flexible operation and adjustable material segregation. It can achieve uniform composition of the material when entering the reaction tower, ensure that the distribution form of the material entering the furnace is coaxial and concentric with the concentrate nozzle, so that the reaction intensity at the same height in the tower is consistent, the reaction heat distribution is more uniform, and the phenomenon of local heat load being too high or too low is avoided. In addition, the slag hanging on the tower wall is evenly distributed, which effectively reduces the long-term damage to the tower wall caused by local scouring, reduces the risk of formation of weak areas, and significantly improves the structural safety and operation stability of the reaction tower. Compared with the traditional flash furnace mixing process, the device occupies a small area and saves space. The method can extend the service life of the reaction tower and reduce maintenance costs. At the same time, it helps to improve the efficiency of the smelting process and product quality, meeting the requirements of modern smelting for high efficiency, energy saving, safety and environmental protection.

[0022] Of course, any product implementing the present invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0023] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0025] Figure 1 It is a structural schematic diagram of a flash furnace charging device provided by the present invention;

[0026] Figure 2 This is a structural schematic diagram of another flash furnace charging device provided by the present invention;

[0027] Figure 3 It is a structural schematic diagram of the stirring device;

[0028] Figure 4 This is a flow chart of a mixing method provided by the present invention;

[0029] 1-one-stage pneumatic chute, 2-two-stage pneumatic chute, 3-three-stage pneumatic chute, 4-mixing box, 5-concentrate nozzle, 6-ash discharge chute, 7-stirring device, 71-stirring rod, 711-fixed rod, 712-connecting rod, 72-stirring head, 73-blade, x-left and right direction, y-front and back direction, z-up and down direction. DETAILED DESCRIPTION

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0032] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0033] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0034] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0035] Example 1

[0036] The present invention provides a flash furnace charging device comprising: a mixing box 4, a pneumatic chute, a fly ash discharge chute 6 and a stirring device 7;

[0037] The mixing box 4 is in a polyhedral shape and includes a top surface and a bottom surface that are oppositely arranged along the vertical direction z and a side surface connecting the top surface and the bottom surface; the mixing box 4 extends along the vertical direction z;

[0038] The pneumatic chute includes a first-stage pneumatic chute 1, a second-stage pneumatic chute 2, and a third-stage pneumatic chute 3, which are arranged on the side of the mixing box 4. The first-stage pneumatic chute 1 includes an inlet and an outlet arranged relatively along the extension direction of the first-stage pneumatic chute 1. The first-stage pneumatic chute 1 passes through the side of the mixing box 4, and the outlet of the first-stage pneumatic chute 1 is arranged in the mixing box 4. The structure of the second-stage pneumatic chute 2 is the same as that of the first-stage pneumatic chute 1. The extension direction of the first-stage pneumatic chute 1 and the extension direction of the second-stage pneumatic chute 2 are both 5° away from the left-right direction x. The outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 form an angle of 10° to 50°; along the vertical direction z, the distance between the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 is 0.1m to 0.5m; the three-stage pneumatic chute 3 includes an inlet and an outlet arranged opposite to each other along the left-right direction x, the three-stage pneumatic chute 3 vertically penetrates the side of the mixing box 4, and the inlet of the three-stage pneumatic chute 3 is arranged in the mixing box 4; the outlet of the three-stage pneumatic chute 3 is connected to the concentrate nozzle 5;

[0039] The ash discharge chute 6 extends in the vertical direction z, and passes through the top surface of the mixing box 4. In the vertical direction z, the outlet of the ash discharge chute 6 is located on the central axis between the outlet of the first stage pneumatic chute 1 and the outlet of the second stage pneumatic chute 2;

[0040] The stirring device 7 includes a stirring rod 71 and a stirring head 72. The stirring rod 71 includes a fixed rod 711 extending along the front-to-back direction y and a connecting rod 712 perpendicular to the fixed rod and extending along the up-down direction z. The fixed rod 711 passes through the side of the mixing box 4 and the connecting rod is arranged in the mixing box 4. Along the up-down direction z, the connection between the connecting rod 712 and the fixed rod 711 overlaps with the center of the bottom surface of the mixing box 4 at the orthographic projection of the bottom surface of the mixing box 4; the stirring head 72 is connected to the free end of the connecting rod 712.

[0041] Specifically, the flash furnace charging device provided by the present invention includes: a mixing box 4, a pneumatic chute, a fly ash discharge chute 6 and a stirring device 7;

[0042] The mixing box 4 is in a polyhedral shape and includes a top surface and a bottom surface that are oppositely arranged along the vertical direction z and a side surface connecting the top surface and the bottom surface; the mixing box 4 extends along the vertical direction z;

[0043] The pneumatic chute includes a first-stage pneumatic chute 1, a second-stage pneumatic chute 2, and a third-stage pneumatic chute 3, which are arranged on the side of the mixing box 4. The first-stage pneumatic chute 1 includes an inlet and an outlet arranged relatively along the extension direction of the first-stage pneumatic chute 1. The first-stage pneumatic chute 1 passes through the side of the mixing box 4, and the outlet of the first-stage pneumatic chute 1 is arranged in the mixing box 4. The structure of the second-stage pneumatic chute 2 is the same as that of the first-stage pneumatic chute 1. The extension direction of the first-stage pneumatic chute 1 and the extension direction of the second-stage pneumatic chute 2 are both 5° away from the left-right direction x. The first-stage pneumatic chute 1 and the second-stage pneumatic chute 2 form an angle of 10° to 50°; along the vertical direction z, the distance between the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 is 0.1m to 0.5m; the third-stage pneumatic chute 3 includes an inlet and an outlet arranged opposite to each other along the left-right direction x, the third-stage pneumatic chute 3 vertically penetrates the side of the mixing box 4, and the inlet of the third-stage pneumatic chute 3 is arranged in the mixing box 4; the outlet of the third-stage pneumatic chute 3 is connected to the concentrate nozzle 5;

[0044] It should be noted that the extension direction of the first-stage pneumatic chute 1 and the extension direction of the second-stage pneumatic chute 2 are both at an angle of 5° to 25° with the left-right direction x, and the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 are at an angle of 10° to 50°; along the up-down direction z, the distance between the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 is 0.1m to 0.5m; wherein, the angle range of the two pneumatic chutes is 10° to 50°, and the height difference of the outlets of the two pneumatic chutes is 0.1m to 0.5m, and the two pneumatic chutes are arranged in space. The bureau is installed at a certain angle and height difference to optimize the mixing effect of the material in the mixing box 4. The angle between the two pneumatic chutes ranges from 10° to 50°, and the concentrate can be transported into the mixing box 4 from different directions to form a certain convergence angle to ensure that the material flows in opposite directions from two directions and fully intersects in the mixing box 4. At the same time, the height difference of the pneumatic chute outlet is designed to be 0.1 meter to 0.5 meter, which further ensures that the material has a certain vertical drop when entering the mixing box 4, so that the material flow is easier to disperse and evenly distributed in the mixing box 4.

[0045] Optionally, the angle between the outlet of the first stage pneumatic chute 1 and the outlet of the second stage pneumatic chute 2 can be 10°, 15°, 18°, 20°, 22°, 26°, 30°, 32°, 34°, 40°, 45° and 50°. When the angle between the outlet of the first stage pneumatic chute 1 and the outlet of the second stage pneumatic chute 2 is less than 10°, the discharge of the two pneumatic chutes is relatively concentrated, which will affect the mixing effect. When the angle of the outlet is greater than 50°, the inclination of the two pneumatic chutes is large, which will affect the material discharge effect. The design of the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 with an angle of 10° to 50° can ensure that the materials transported by the two pneumatic chutes will not directly overlap or conflict, but converge at an appropriate angle. Along the up and down direction z, the distance between the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2 is 0.1m to 0.5m to ensure the material discharge effect.

[0046] It can be understood that, through the coordination of the angle and height difference between the first-stage pneumatic chute 1 and the second-stage pneumatic chute 2, the concentrates transported by the two chutes form mutually intersecting material flows in the mixing box 4. On the one hand, the design of the angle range of 10° to 50° can ensure that the materials transported by the two chutes will not directly overlap or conflict, but converge at an appropriate angle, thereby creating good initial conditions for subsequent stirring and mixing. On the other hand, the setting of the outlet height difference makes the two material flows staggered in the vertical direction, further improving the diffusion efficiency of the material in the mixing box 4, avoiding the concentrated accumulation of materials in a certain area, and can effectively improve the distribution of materials in the mixing box 4, improve the mixing uniformity of concentrates and other materials, and reduce mixing dead corners or accumulation phenomena. In addition, the appropriate angle range and height difference can reduce the resistance and wear of material transportation in the chute, extend the service life of the equipment, have good adaptability to different material flow rates and working conditions, ensure the stability of the mixing effect in the mixing box 4, thereby providing a uniform material basis for subsequent reaction processes.

[0047] The ash discharge chute 6 extends in the vertical direction z, and passes through the top surface of the mixing box 4. In the vertical direction z, the outlet of the ash discharge chute 6 is located on the central axis between the outlet of the first stage pneumatic chute 1 and the outlet of the second stage pneumatic chute 2;

[0048] It should be noted that the outlet of the ash discharge chute 6 is located on the central axis between the outlet of the first-stage pneumatic chute 1 and the outlet of the second-stage pneumatic chute 2, which can effectively improve the mixing uniformity of the ash and concentrate, ensure the consistency of the material composition in the flash furnace reaction tower, and thus improve the material reaction efficiency. In addition, the vertical discharge method reduces the deviation or dust of the ash during the discharge process, and at the same time reduces the risk of equipment wear and blockage caused by unreasonable layout. This optimized design can also adapt to changes in the flow rate of different materials, ensure the stability of the material mixing in the mixing box 4, and improve the reliability and efficiency of the entire system operation.

[0049] It can be understood that the outlet of the ash discharge chute 6 is located on the central axis between the two pneumatic chute outlets and is perpendicular to the central axis of the mixing box 4, ensuring that the ash can enter the mixing box 4 evenly and achieve the best mixing effect with the concentrate transported by the pneumatic chute. It can also ensure that the ash is evenly distributed when discharged from the ash discharge chute 4. At the same time, the outlet of the ash discharge chute 6 maintains a vertical relationship with the central axis of the mixing box 4, ensuring that the ash can fall vertically into the mixing box 4, reducing deviation or accumulation.

[0050] The stirring device 7 includes a stirring rod 71 and a stirring head 72. The stirring rod 71 includes a fixed rod extending along the front-to-back direction y and a connecting rod perpendicular to the fixed rod and extending along the up-down direction z. The fixed rod passes through the side of the mixing box 4 and the connecting rod is arranged in the mixing box 4. Along the up-down direction z, the connection between the connecting rod and the fixed rod overlaps with the center of the bottom surface of the mixing box 4 at the orthographic projection of the bottom surface of the mixing box 4; the stirring head 72 is connected to the free end of the connecting rod.

[0051] The stirring device 7 is an electric propeller, wherein the stirring head 72 includes at least two blades 73, the angle between the blades 73 is 30° to 60°, and the inclination angle of the blades 73 relative to the rotation axis is in a moderate range, which can generate sufficient shear force and driving force during the stirring process, so that the material can be fully flowed and dispersed in the mixing box 4. The angle of the blade 73 close to 30° can reduce the resistance during stirring and is suitable for lighter or more fluid materials; the angle close to 60° can enhance the stirring and mixing effect of the material and is suitable for heavier or more viscous materials. This angle design can balance stirring efficiency and energy consumption, allowing the stirring device 7 to operate efficiently under different material properties and flow conditions.

[0052] In the left and right directions, the length of the blade 73 is 0.8 to 1 times the extreme value distance of the mixing box 4. The size of the stirring device 7 in the mixing box 4 covers the entire cross-sectional area of ​​the mixing box 4 and can extend to every corner of the mixing box 4, ensuring that all materials in the mixing box 4 can be fully contacted and evenly stirred. By covering the entire cross-sectional area of ​​the stirring rod 71, the material accumulation, dead corner formation or uneven mixing caused by certain areas not being stirred inside the mixing box 4 can be avoided. Whether it is concentrate, ash or other materials in the mixing box 4, they will be completely covered and participate in the stirring process under the action of the stirring rod 71.

[0053] It should be noted that the extreme point distance is geometrically defined as the maximum span of the polyhedron in the left-right direction, that is, the projection distance from the leftmost vertex to the rightmost vertex on the left-right axis. The size of the stirring device 7 in the mixing box 4 covers the entire cross-sectional area of ​​the mixing box 4 and can extend to every corner of the mixing box 4.

[0054] It should be noted that the stirring device 7 can also be a drum-type stirring rod 71, which can generate sufficient shear force and fluidity through rotational motion or mechanical action to enable the materials to be fully mixed in the mixing box 4. The size covers the entire cross-sectional area of ​​the mixing box 4, and can also ensure that the stirring device 7 will not affect the normal operation of the equipment due to material accumulation during operation, especially when processing high-density, granular concentrates and fly ash, which can effectively prevent material stratification or segregation.

[0055] It should be noted that the speed range of the stirring rod 71 is 10 rpm to 100 rpm, which can adapt to the material properties and mixing requirements under different working conditions; low speed (about 10 rpm) is suitable for low viscosity, light or small particle materials, to avoid excessive stirring causing material flying or stratification; high speed (about 100 rpm) is suitable for high viscosity, heavy or large particle materials, to provide sufficient shear force and fluidity to ensure uniform mixing; the speed range is wide, which can meet various mixing requirements from light particles to high-density mixtures. The appropriate speed is selected according to the material characteristics to avoid excessive or insufficient stirring, optimize the mixing time and effect, and adjust the speed to adapt to the working conditions, reduce unnecessary mechanical loads, and extend the service life of the stirring device 7.

[0056] In some optional embodiments, air holes are evenly arranged on the outer edge of the bottom of the mixing box 4 , and the air holes penetrate the bottom of the mixing box 4 along the left-right direction x, and the air holes are circular holes.

[0057] In some optional embodiments, a fluidizing air device is further included, and the fluidizing air device includes an air outlet, which is connected to the air hole and is circular.

[0058] It should be noted that the flow rate of the fluidizing air can be flexibly adjusted through the control valve to adapt to different material properties and mixing requirements. Low air volume is suitable for light materials or working conditions that require control of the suspension height to avoid excessive flow or flying of materials. High air volume is suitable for heavier or more viscous materials, providing greater airflow intensity to achieve full suspension and fluidization; the control valve can adjust the air flow according to the real-time working conditions to avoid uneven fluidization of materials caused by excessive or weak airflow, adjust the air volume according to actual needs, avoid excessive use of air compressors, and reduce energy consumption. Reasonable air flow can maintain the dynamic suspension state of the material in the mixing box 4 to prevent accumulation or stratification.

[0059] It should be noted that the fluidizing air equipment can be one or more of a piston air compressor, a screw air compressor and an air booster; when using a piston air compressor, the air outlet of the air compressor is connected to the air hole at the bottom of the mixing box 4 through a pipe, and the output pressure is adjusted to 2Kg-6Kg through the pressure regulating device of the air compressor; start the air compressor, and the compressed air enters the mixing box 4 through the air hole to fluidize the material; when using a screw air compressor, it is also necessary to connect the air outlet of the air compressor to the air hole at the bottom of the mixing box 4 through a pipe, and use the pressure control system of the air compressor to stabilize the output pressure at 2Kg-6Kg.

[0060] In some optional embodiments, the inner wall of the pneumatic chute is coated with a wear-resistant coating, the material of the wear-resistant coating is a ceramic coating or an alloy coating, and the thickness of the wear-resistant coating is 0.5 mm to 2 mm.

[0061] The outer wall of the mixing box 4 is provided with a heat insulation layer. The heat insulation layer material is ceramic fiber or aluminum silicate fiber, and its thickness ranges from 20 mm to 50 mm.

[0062] It should be noted that ceramic coatings have extremely high hardness and wear resistance, and can effectively resist the erosion and wear of high-speed flowing materials (such as fine-particle concentrates and soot) on the inner wall of the chute. In addition, ceramic coatings have high chemical stability and are not easy to chemically react with materials, making them suitable for long-term conveying of highly abrasive and corrosive materials. High-strength wear-resistant alloy coatings have good toughness and impact resistance, and can withstand working conditions with large material impact forces. At the same time, they have significant wear resistance and are suitable for use under complex conveying conditions. A coating thickness of 0.5 mm is sufficient to provide basic wear protection and is used in working conditions with low material flow rates or light wear. A thickness of 2 mm can enhance the impact resistance and durability of the coating and is suitable for working conditions with high-speed flowing materials or high-wear conditions.

[0063] It should be noted that ceramic fiber has excellent thermal insulation properties, low thermal conductivity and high temperature resistance, and is suitable for thermal insulation applications on the outer wall of the mixing box 4. The ceramic fiber material is lightweight and will not impose additional burden on the structure of the mixing box 4; aluminum silicate fiber is a high-efficiency thermal insulation material with high high-temperature resistance and chemical stability. It can maintain thermal insulation effects for a long time in high-temperature environments and has certain corrosion resistance; when the thermal insulation coating is 20 mm thick, it is suitable for medium and low temperature working conditions and can meet general thermal insulation needs; when the thickness is 50 mm, it is suitable for high-temperature working conditions and can provide stronger thermal insulation effects to prevent excessive internal heat loss while protecting external equipment and operating environment.

[0064] On the other hand, the present invention also provides a mixing method applicable to the aforementioned flash furnace charging device, comprising the steps of:

[0065] S1: The concentrate is transported to the mixing box 4 through the first stage pneumatic chute 1 and the second stage pneumatic chute 2 respectively;

[0066] S2: transporting the ash into the mixing box 4 through the ash discharge chute 6;

[0067] S3: operating the stirring device 7 and the fluidizing air device to mix the concentrate with the fly ash to obtain a mixed material;

[0068] S4: The mixed material is transported to the concentrate nozzle 5 through the three-stage pneumatic chute 3.

[0069] Specifically, the present invention further provides a mixing method applicable to the aforementioned flash furnace charging device, comprising the steps of:

[0070] S1: The concentrate is transported to the mixing box 4 through the first-stage pneumatic chute 1 and the second-stage pneumatic chute 2 respectively; the inlets of the first-stage pneumatic chute 1 and the second-stage pneumatic chute 2 respectively transport the concentrate to the outlet, and then step S2: the fly ash is transported to the mixing box 4 through the fly ash discharge chute 6: the fly ash falls vertically into the mixing box 4 and mixes with the concentrate; step S3: the stirring device 7 and the fluidized air equipment are operated to mix the concentrate with the fly ash to obtain a mixed material; the stirring device 7 stirs the raw materials in the mixing box 4 and the fluidized air equipment works to introduce fluidized air into the mixing box 4 through the air holes at the bottom of the mixing box 4, further enhancing the mixing effect; S4: the mixed material is transported to the concentrate nozzle 5 through the three-stage pneumatic chute 3 to facilitate entering the reaction tower for reaction.

[0071] It should be noted that the conveying direction of the three-stage pneumatic chute 3 is coaxial with the central axis of the concentrate nozzle 5, so that the material gradually changes direction during the conveying process and finally faces the same direction as the central axis of the concentrate nozzle 5. Specifically, the three-stage pneumatic chute 3 extracts the material from the mixing box through the inlet of the three-stage pneumatic chute during the material conveying process, and conveys the material in reverse to the concentrate nozzle 5 to ensure that the material can enter the nozzle accurately and efficiently; through the design of reverse direction conveying, the flow characteristics of the mixed material can be optimized, and the deviation or accumulation caused by inconsistent conveying direction can be avoided. At the same time, the material is aligned with the central axis of the concentrate nozzle 5 in the three-stage pneumatic chute 3, so that the material can enter the nozzle accurately, ensuring the smoothness and stability of the subsequent process.

[0072] It is understood that the design of three-stage pneumatic chutes 3 conveying in opposite directions can effectively improve the accuracy and stability of material transportation. By adjusting the conveying angle, the material is ultimately coaxial with the central axis of the concentrate nozzle 5, preventing the material from deviating from the nozzle or entering the reaction tower unevenly. In addition, this design can reduce the risk of material wear and blockage during transportation, extending the service life of the equipment, while improving the uniformity of material distribution within the nozzle, providing stable material flow support for subsequent process steps. By optimizing the conveying angle range, this design can also adapt to different material flow rates and operating conditions, achieving efficient and accurate material transportation.

[0073] In some optional embodiments, the flow rate of the fluidized air generated by the fluidized air device is 5m 3 / h to 50m 3 / h.

[0074] It should be noted that the flow range of fluidized air is 5m 3 / h to 50m 3 / h, and the air volume is introduced through a circle of evenly distributed air holes at the bottom of the mixing box 4. In order to achieve uniform mixing and dynamic fluidization of the materials in the mixing box 4, a uniformly distributed air hole structure is designed around the bottom of the mixing box 4. The air holes are used to introduce a certain range of fluidization air volume, so that the materials in the mixing box 4 are in a suspended or loose state. The flow range of the fluidization air is limited to 5m 3 / h to 50m 3 / h, ensuring that sufficient airflow intensity is provided to fluidize the materials while avoiding excessive air volume that causes excessive material flying or excessive turbulence in the mixing box 4. The fluidized air is used to blow away the materials at the bottom of the mixing box 4 and suspend their particles, thereby reducing static contact and accumulation between materials and improving the fluidity and mixing effect of the materials in the mixing box 4. By introducing air volume through a circle of evenly distributed air holes at the bottom of the mixing box 4, a uniform distribution of airflow can be achieved, thereby uniformly fluidizing the materials in the entire mixing box 4. The surrounding air hole distribution design effectively avoids the problem of excessive or weak local airflow, ensuring that the mixing state of the materials in each area of ​​the mixing box 4 is consistent.

[0075] It is understandable that a reasonable range of fluidization air volume (5m 3 / h to 50m 3 / h) can effectively improve the dispersion and mixing uniformity of materials in the mixing box 4, and avoid the accumulation or dead corners of materials due to gravity. At the same time, the design of a circle of evenly distributed air holes at the bottom can reduce the material deviation or turbulence caused by uneven airflow, ensure the stability of the mixing process in the mixing box 4, and through the auxiliary effect of fluidized wind, it can also reduce the workload of the stirring device 7, reduce equipment wear and improve operating efficiency. In addition, this design can adapt to the characteristics and flow changes of different materials, so that the mixing box 4 can maintain a good mixing effect under various working conditions and provide uniform materials for subsequent process.

[0076] It can be seen from the above embodiments that the flash furnace charging device and mixing method provided by the present invention achieve at least the following beneficial effects:

[0077] The present invention provides a flash furnace feeding device and mixing method. By optimizing the design of the feeding device, the concentrate, flux and fly ash are fully mixed in multiple sections before entering the furnace, thereby solving the problem of uneven distribution of material components in the traditional mixing process. The feeding device has the characteristics of simple structure, small footprint, flexible operation and adjustable material segregation. It can achieve uniform composition of the material when entering the reaction tower, ensure that the distribution form of the material entering the furnace is coaxial and concentric with the concentrate nozzle, so that the reaction intensity at the same height in the tower is consistent, the reaction heat distribution is more uniform, and the phenomenon of local heat load being too high or too low is avoided. In addition, the slag hanging on the tower wall is evenly distributed, which effectively reduces the long-term damage to the tower wall caused by local scouring, reduces the risk of formation of weak areas, and significantly improves the structural safety and operational stability of the reaction tower. Compared with the traditional flash furnace mixing process, the device occupies a small area and saves space. The method can extend the service life of the reaction tower and reduce maintenance costs, while helping to improve the efficiency of the smelting process and product quality, meeting the requirements of modern smelting for high efficiency, energy saving, safety and environmental protection.

[0078] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A flash furnace charging device, characterized in that: include: Mixing box, pneumatic chute, ash discharge chute and stirring device; The mixing box is in a polyhedron shape, and includes a top surface and a bottom surface arranged opposite to each other in the up-down direction, and a side surface connecting the top surface and the bottom surface; The pneumatic chute includes a first-stage pneumatic chute, a second-stage pneumatic chute and a third-stage pneumatic chute arranged on the side of the mixing box. The first-stage pneumatic chute includes an inlet and an outlet arranged relatively along the extension direction of the first-stage pneumatic chute. The first-stage pneumatic chute passes through the side of the mixing box and the outlet of the first-stage pneumatic chute is arranged in the mixing box; the structure of the second-stage pneumatic chute is the same as that of the first-stage pneumatic chute; the extension direction of the first-stage pneumatic chute and the extension direction of the second-stage pneumatic chute are both 5 degrees apart from the left and right directions. The angle between the outlet of the first-stage pneumatic chute and the outlet of the second-stage pneumatic chute is 10° to 50°; along the vertical direction, the distance between the outlet of the first-stage pneumatic chute and the outlet of the second-stage pneumatic chute is 0.1m to 0.5m; the three-stage pneumatic chute includes an inlet and an outlet arranged opposite to each other along the left-right direction, the three-stage pneumatic chute vertically penetrates the side of the mixing box, and the inlet of the three-stage pneumatic chute is arranged in the mixing box; the outlet of the three-stage pneumatic chute is connected to the concentrate nozzle; The ash discharge chute extends in the up-down direction, passes through the top surface of the mixing box, and along the up-down direction, the outlet of the ash discharge chute is located on the central axis between the outlet of the first stage pneumatic chute and the outlet of the second stage pneumatic chute; The stirring device is an electric propeller, and the stirring device includes a stirring rod and a stirring head. The stirring rod includes a fixed rod extending in the front-to-back direction and a connecting rod perpendicular to the fixed rod and extending in the up-down direction. The fixed rod passes through the side of the mixing box and the connecting rod is arranged in the mixing box. Along the up-down direction, the connection between the connecting rod and the fixed rod overlaps with the center of the bottom surface of the mixing box in the positive projection of the bottom surface of the mixing box; the stirring head is connected to the free end of the connecting rod, and the stirring head includes at least two blades, the angle between the blades is 30° to 60°, and the length of the blade in the left-right direction is 0.8 times to 1 times the extreme value distance of the mixing box.

2. The flash furnace charging device according to claim 1, characterized in that: Air holes are evenly arranged on the outer edge of the bottom of the mixing box. The air holes penetrate the bottom of the mixing box in the left-right direction and are circular holes.

3. The flash furnace charging device according to claim 1, characterized in that: It also includes a fluidizing air device, which includes an air outlet, the air outlet is connected to the air hole, and the air outlet is circular.

4. The flash furnace charging device according to claim 1, characterized in that: The inner wall of the pneumatic chute is coated with a wear-resistant coating, the material of the wear-resistant coating is a ceramic coating or an alloy coating, and the thickness of the wear-resistant coating is 0.5 mm to 2 mm; The outer wall of the mixing box is provided with a heat insulation layer. The material of the heat insulation layer is ceramic fiber or aluminum silicate fiber. The thickness of the heat insulation layer is 20 mm to 50 mm.

5. A mixing method, applicable to the flash furnace charging device according to any one of claims 1 to 4, characterized in that: Including steps: The concentrate is transported to the mixing box through the first stage pneumatic chute and the second stage pneumatic chute respectively; transporting the ash into the mixing box through the ash discharge chute; operating the stirring device and the fluidizing air device to mix the concentrate with the fly ash to obtain a mixed material; The mixed material is transported to the concentrate nozzle through the three-stage pneumatic chute.

6. The mixing method according to claim 5, characterized in that: The flow rate of the fluidized air generated by the fluidized air equipment is 5m 3 / h to 50m 3 / h.

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