A coal powder detection and feeding device and method for laterite nickel ore smelting

Abstract

The present application relates to a coal powder detection and feeding device and method for laterite nickel ore smelting, and relates to the technical field of laterite nickel ore smelting equipment. The detection and feeding device includes a feed pipe, a storage tank and a blowing tank. The upper end of the storage tank is connected to the feed pipe, and the lower end is connected to a secondary feed pipe, and a feed control valve is provided on the secondary feed pipe. The upper end of the blowing tank is connected to the secondary feed pipe, and the lower end is connected to a feeder; the feed pipe is connected to a sampling pipe, and the sampling pipe is connected to a separation pipe, and a sampling control valve is provided on the sampling pipe; the separation pipe is vertically arranged, and a total weight detection mechanism is provided in the separation pipe, and the total weight detection mechanism is used to detect the weight of coal powder transported into the separation pipe by the sampling pipe; a separation assembly for separating coal powder is provided in the separation pipe, and the separation assembly is located on the upper side of the total weight detection mechanism; the bottom of the separation pipe is connected to an air supply mechanism, and the top of the separation pipe is connected to a collection and weighing mechanism. The present application can realize uninterrupted supply of coal powder and real-time detection of coal powder quality.

Description

Technical Field

[0001] The present application relates to the technical field of laterite nickel ore smelting equipment, and in particular to a coal powder detection and feeding device and method for laterite nickel ore smelting. Background Art

[0002] Laterite nickel ore is a nickel-containing ore that mainly exists in laterite or loess in tropical and subtropical regions. It is one of the important sources of nickel. The extraction and processing of laterite nickel ore is relatively complicated. Common extraction methods include redox method, leaching method and thermal method. The laterite nickel ore smelting process is the process of extracting the metal components in the laterite nickel ore. The nickel, iron, chromium and other metal components in the laterite nickel ore can be separated and purified by smelting.

[0003] Among them, the side-blowing reduction technology of laterite nickel ore with oxygen-enriched coal powder belongs to the promotion of side-blowing submerged combustion molten pool smelting technology in the field of laterite nickel ore smelting. The violent bubbling of the molten pool and the tumbling of the liquid slag produce a huge reaction interface. The iron and nickel oxides are heated, melted and reduced and sulfided, and the reduced nickel matte liquid beads are settled and separated and enter the static slag layer below the nozzle. Under the action of gravity, the slag and matte begin to separate, thus forming a slag layer that basically does not contain nickel on the upper part of the furnace, and the nickel matte is deposited at the bottom of the furnace. Ingots are discharged from the nickel matte discharge port. After the gangue (SiO2, MgO, Al2O3, CaO, etc.) in the ore is melted, liquid slag with good performance is generated and discharged from the slag discharge port.

[0004] At present, the smelting of laterite nickel ore mainly uses natural gas, coal gas, coal powder and electricity as energy. Among them, coal powder can not only be used as fuel, but also explodes in the furnace as a reducing agent when it is sprayed into the smelting furnace through a spray gun, producing countless fine carbon-containing particles, which greatly improves and enhances the metallurgical interface reaction conditions of the reduction smelting process and strengthens the smelting process. In this process, the particle size of coal powder is directly related to the combustion efficiency, heat transfer efficiency and reduction efficiency of coal powder, which in turn has an important impact on the smelting of laterite nickel ore.

[0005] Existing coal powder is often obtained by crushing coal blocks. After the coal powder is produced, it is directly transported to the smelting plant, loaded into a storage tank, and then transported to the spray gun through pneumatic conveying equipment. The spray gun directly sprays the coal powder into the smelting furnace. Since some large particles of coal slag are not completely crushed during the production of coal powder, some coal powder particles are large; and in the transportation process of coal powder, some other large solid impurities are easily mixed in. The existence of these two situations makes the quality of coal powder uncontrollable. If the coal powder used contains such large particles of impurities, it is easy to cause the spray gun to be blocked, and even reduce the efficiency of laterite nickel ore smelting. Summary of the invention

[0006] The present application provides a coal powder detection and feeding device and method for laterite nickel ore smelting, the purpose of which is to automatically detect the coal powder when the coal powder is fed and determine the quality of the conveyed coal powder.

[0007] In the first aspect, the present application provides a coal powder detection and feeding device for laterite nickel ore smelting, which adopts the following technical solution:

[0008] A coal powder detection and feeding device for laterite nickel ore smelting comprises a feed pipe, a storage tank and a blowing tank, wherein the upper end of the storage tank is connected to the feed pipe, and the lower end is connected to a secondary feed pipe, and a feed control valve is arranged on the secondary feed pipe; the upper end of the blowing tank is connected to the secondary feed pipe, and the lower end is connected to a feeder; the feed pipe is connected to a sampling pipe, and the sampling pipe is connected to a separation pipe, and a sampling control valve is arranged on the sampling pipe; the separation pipe is vertically arranged, and a total weight detection mechanism is arranged in the separation pipe, and the total weight detection mechanism is used to detect the weight of the coal powder transported into the separation pipe by the sampling pipe; a separation component for separating the coal powder is arranged in the separation pipe, and the separation component is located on the upper side of the total weight detection mechanism; the bottom of the separation pipe is connected to an air supply mechanism for fluidizing the coal powder and transporting the fluidized coal powder upward, and the top of the separation pipe is connected to a collecting and weighing mechanism for collecting the fluidized coal powder and weighing the coal powder.

[0009] By adopting the above technical solution, firstly, the feed pipe, storage tank and spray tank are arranged in coordination. When feeding the spray gun on the smelting furnace, the feed pipe feeds the storage tank, the storage tank feeds the spray tank, the spray tank feeds the feeder, and the feeder can feed the spray gun. After the coal powder in the spray tank is used, the coal powder in the storage tank is replenished into the spray tank in time, and after the coal powder in the spray tank is replenished, the feed pipe can replenish the coal powder in the storage tank again. Therefore, this can ensure that the feeder feeds the spray gun uninterruptedly.

[0010] Secondly, in the process of conveying coal powder in the feeding pipe, through the cooperation of the sampling pipe, separation pipe, total weight detection mechanism, air supply mechanism and collection and weighing mechanism, the sampling pipe conveys part of the coal powder sample to the separation pipe, at which time the total weight detection mechanism realizes the detection of the coal powder sample. After the detection is completed, the air supply mechanism fluidizes the coal powder sample. At this time, the fluidized coal powder is conveyed upward through the separation component. After separation by the separation component, the coarse coal powder falls to the bottom of the separation pipe, while the fine coal powder continues to rise after passing through the separation component, and then flows into the collection and weighing mechanism. The collection and weighing mechanism collects and weighs the fluidized fine coal powder. The mass of this batch of coal powder conveyed to the storage tank is determined according to the total weight of the coal powder sample and the weight of the fine coal powder.

[0011] This enables the coal powder in the conveying pipe to be automatically tested at irregular intervals during coal conveying, so as to determine whether the quality of the coal powder meets the requirements. When there are major problems with the quality of the coal powder, it can be discovered in time, and the conveying of the coal powder can be quickly stopped and replaced with new coal powder, thereby reducing the risk of gun blockage and improving the smelting efficiency of laterite nickel ore.

[0012] Optionally, the separation component includes a spiral blade, which is vertically arranged in the separation tube, the outer wall of the spiral blade is connected to the inner wall of the separation tube, and the spiral blade forms a spiral ascending flow channel in the separation tube for separating coal powder.

[0013] By adopting the above technical solution, the spiral blades are set to form a spiral ascending flow channel in the separation tube. When the fluidized coal powder passes through the spiral ascending flow channel, under the action of gravity, centrifugal force and inertia, the coarse coal powder sinks and the fine coal powder rises, thereby achieving effective separation of the coal powder.

[0014] Optionally, the separation assembly includes a separation screen plate, and the separation screen plate is connected to the inner wall of the separation tube.

[0015] By adopting the above technical solution, the separation screen plate can accurately separate coal powder of different particle sizes according to the aperture size, thereby improving the separation accuracy.

[0016] Optionally, a plurality of vibrators are provided on the outer wall of the separation tube.

[0017] By adopting the above technical solution, the vibrator can shake off the coal powder attached to the separation tube and the separation component, so that the coal powder is reintegrated into the fluidized coal powder, and then can be separated again.

[0018] Optionally, the air supply mechanism includes an air supply pipe, which is horizontally arranged and located at the lower side of the separation pipe, and the lower end of the separation pipe is connected to the air supply pipe; one end of the air supply pipe is connected to a first fan, and the other end is connected to a coarse powder weighing assembly, and a weighing control valve is provided on the air supply pipe, and the weighing control valve is used to control the connection or closure of the first fan and the coarse powder weighing assembly.

[0019] By adopting the above technical solution, the air supply pipe and the first fan are arranged in coordination, and when the first fan is started, air flow can be blown into the separation pipe, so as to fluidize the coal powder and ensure that the fluidized coal powder can continue to be transported upward. The weighing control valve and the coarse powder weighing assembly are arranged, and after the coal powder separation is completed, the coarse coal powder falls into the air supply pipe. At this time, after the weighing control valve and the first fan are turned on, the coarse coal powder will be blown into the coarse powder weighing assembly for weighing.

[0020] Optionally, the collecting and weighing mechanism includes a collecting tube and a fine powder weighing assembly, and both ends of the collecting tube are respectively connected to the separation tube and the fine powder weighing assembly; the fine powder weighing assembly includes a mounting tube, a weighing tube and a weighing piece, the mounting tube is vertically arranged, the mounting tube is sleeved on the outside of the weighing tube, the weighing piece is arranged on the inner wall of the mounting tube, and the weighing piece supports the weighing tube on the upper side, the weighing tube is used to collect coal powder, and the weighing piece is used to detect the weight of the weighing tube; a number of air-permeable micropores are provided on the side wall of the mounting tube and the side wall of the weighing tube.

[0021] By adopting the above technical solution, the setting of the collecting pipe allows the fluidized coal powder passing through the separation component to enter the collecting pipe and then be sent to the fine powder weighing component. The fine powder weighing component is arranged by the coordination of the mounting pipe, the weighing pipe and the weighing piece. The weighing pipe collects the coal powder, and the weighing piece detects the weight of the weighing pipe in real time, so that the weight of the separated fine coal powder can be detected in real time.

[0022] Optionally, a sealing control valve is provided at the lower end of the weighing tube, and the sealing control valve is used to control the opening or closing of the weighing tube.

[0023] By adopting the above technical solution, the sealing control valve can open or close the lower end of the weighing tube. When the sealing control valve closes the weighing tube, the weighing tube can store coal powder. When the sealing control valve opens the weighing tube, the coal powder in the weighing tube can be discharged.

[0024] Optionally, a reflux mechanism is provided at the lower end of the weighing tube, and the reflux mechanism includes a reflux pipe and a reflux gas source. The reflux pipe is horizontally arranged, and the two ends of the reflux pipe are respectively connected to the reflux gas source and the feed pipe; the upper side of the reflux pipe is connected to an auxiliary pipe, the auxiliary pipe is coaxially connected to the mounting pipe, and the lower end of the weighing tube is located in the auxiliary pipe.

[0025] By adopting the above technical scheme, the reflux mechanism is connected with the reflux pipe and the weighing pipe through the setting of the reflux pipe, the reflux air source and the auxiliary pipe. Then, after the weighing pipe drops the fine coal powder into the reflux pipe, the fine coal powder will be blown back into the feed pipe under the action of the reflux air source, thereby realizing the reflux of the coal powder.

[0026] Optionally, a back-blowing mechanism is further included, which includes a second fan and a back-blowing pipe, both ends of the back-blowing pipe are respectively connected to the separation pipe and the second fan, and a back-blowing control valve is provided on the back-blowing pipe.

[0027] By adopting the above technical solution, the back-blowing mechanism is provided with a second fan, a back-blowing pipe and a back-blowing control valve. After the separation of the coal powder in the separation tube is completed, the second fan is turned on to blow the coal powder attached to the separation tube and the separation component back to the bottom of the separation tube, so that the coal powder can be separated again, thereby improving the effect of coal powder separation.

[0028] In the second aspect, the present application provides a method for detecting coal powder feeding for laterite nickel ore smelting using the following technical solution:

[0029] A method for detecting coal powder feeding for laterite nickel ore smelting, using the above-mentioned coal powder detection and feeding device for laterite nickel ore smelting to feed coal powder, comprises the following steps:

[0030] S1. The conveying pipe conveys pulverized coal into the storage tank and performs pulverized coal detection;

[0031] S11, sampling the coal powder and weighing the coal powder sample;

[0032] S12, separating the coal powder, and collecting and weighing the separated fine coal powder;

[0033] S13, back-blowing the coal powder to blow the coal powder attached to the separation tube back to the bottom of the separation tube;

[0034] S14, repeating steps S12-S13 for multiple times until the weighing result of the fine coal powder does not change significantly;

[0035] S15, collecting and weighing the coarse coal powder;

[0036] S16, the coarse coal powder is discharged, and the fine coal powder flows back into the conveying pipe;

[0037] S17, calculating the ratio of coarse coal powder to fine coal powder according to the total weight of the tested coal powder sample, the weight of coarse coal powder and the weight of fine coal powder, so as to determine the quality of the coal powder;

[0038] S2, the storage tank conveys pulverized coal into the injection tank;

[0039] S3. The coal powder in the spray tank is fed into the feeder, and the feeder transports the coal powder to the corresponding spray gun.

[0040] By adopting the above technical solution and the above method, the pulverized coal samples transported in the conveying pipe can be automatically detected at irregular intervals and in irregular quantities, thereby automatically determining the quality of the pulverized coal.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. The present application can realize uninterrupted supply of coal powder to the spray gun through the feed pipe, storage tank and spray tank; and when the coal powder is transported to the storage tank through the feed pipe, the coal powder in the delivery pipe can be automatically detected at irregular intervals, so as to determine whether the quality of the coal powder meets the requirements. When there are major problems with the quality of the coal powder, it can be discovered in time, and the delivery of the coal powder can be quickly stopped and replaced with new coal powder, thereby reducing the risk of gun blockage and improving the smelting efficiency of laterite nickel ore.

[0043] 2. This application can calculate the proportion of coarse coal powder and fine coal powder particles through the cooperation of the total weight detection mechanism, the fine powder weighing mechanism and the coarse powder weighing mechanism, thereby determining the quality of the coal powder.

[0044] 3. The present application can reflux the weighed fine coal powder by setting up a reflux mechanism, thereby reducing coal powder waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the overall structure of the coal powder detection and feeding device of Example 1 of the present application.

[0046] Figure 2 It is a schematic diagram of the overall structure of the storage pipe and the spray tank of Example 1 of the present application.

[0047] Figure 3 It is a schematic diagram of the overall structure of the sampling tube, separation tube, air supply mechanism, collection and weighing mechanism, reflux mechanism and back-blowing mechanism of Example 1 of the present application.

[0048] Figure 4 It is a schematic diagram of the cross-sectional structure of the separation tube of Example 1 of the present application.

[0049] Figure 5 yes Figure 4 Schematic diagram of the local enlarged structure of part A.

[0050] Figure 6 It is a schematic cross-sectional structural diagram of the fine powder weighing assembly of Example 1 of the present application.

[0051] Figure 7 It is a schematic diagram of the cross-sectional structure of the separation tube of Example 2 of the present application.

[0052] In the figure, 1, feed pipe; 2, storage tank; 21, primary feed pipe; 22, secondary feed pipe; 3, spray tank; 31, tertiary feed pipe; 32, feeder; 33, pressure balance pipe; 34, compressed air pipe; 4, sampling pipe; 41, sampling control valve; 5, separation pipe; 51, separation assembly; 511, spiral blade; 512, spiral ascending flow channel; 513, separation screen plate; 52, powder collecting hopper; 521, powder collecting trough; 522, powder guide pipe; 6, total weight detection mechanism; 61, support plate; 62, rotating drive member; 621, oblique support rod; 622, vertical guide rod; 623, slider; 624, vertical drive; 63, Weighing device; 64, storage plate; 65, hidden slot; 7, air supply mechanism; 71, air supply pipe; 711, anti-suction screen plate; 712, weighing control valve; 72, first fan; 73, coarse powder weighing assembly; 74, connecting pipe; 8, collecting weighing mechanism; 81, collecting pipe; 82, fine powder weighing assembly; 821, mounting pipe; 822, weighing pipe; 8221, sealing control valve; 823, weighing piece; 9, vibrator; 10, reflux mechanism; 101, reflux pipe; 102, reflux air source; 103, auxiliary pipe; 20, backblowing mechanism; 201, second fan; 202, backblowing pipeline; 203, backblowing control valve. DETAILED DESCRIPTION

[0053] The following is combined with Figure 1 -Attached Figure 7 , further details of this application are given.

[0054] Example 1: A coal powder detection and feeding device for laterite nickel ore smelting, referring to Figure 1 and Figure 2 , including a feed pipe 1, a storage tank 2 and a spray tank 3. The storage tank 2 and the spray tank 3 are arranged in a vertical direction, and the storage tank 2 is located above the spray tank 3 in the vertical direction. The top of the storage tank 2 is connected to a primary feed pipe 21, and the bottom is connected to a secondary feed pipe 22. The top of the spray tank 3 is connected to a tertiary feed pipe 31, and the bottom is connected to a feeder 32. The feed pipe 1 is connected to the primary feed pipe 21, and the secondary feed pipe 22 is connected to the tertiary feed pipe 31. Feed control valves are arranged on the primary feed pipe 21 and the tertiary feed pipe 31. Specifically, the feed control valve adopts a gate valve.

[0055] When the storage tank 2 is fed, the feed control valve on the primary feed pipe 21 is opened, and the feed control valve on the tertiary feed pipe 31 is closed, and the storage tank 2 can store coal powder. When the injection tank 3 needs to be fed, the feed control valve on the primary feed pipe 21 is closed, and the feed control valve on the tertiary feed pipe 31 is opened, and the coal powder in the storage tank 2 falls into the injection tank 3, so that the injection tank 3 is fed.

[0056] In this embodiment, refer to Figure 2A pressure balance pipe 33 is provided between the storage tank 2 and the injection tank 3. One end of the pressure balance pipe 33 is connected to the storage tank 2, and the other end is connected to the injection tank 3. A control valve is provided on the pressure balance pipe 33. The pressure balance pipe 33 is provided to balance the internal pressure between the storage tank 2 and the injection tank 3, so as to ensure that the pulverized coal can be normally input into the injection tank 3.

[0057] In this embodiment, refer to Figure 2 The upper ends of the storage tank 2 and the spray tank 3 are both connected with a compressed air pipe 34, on which a control valve is provided, and the compressed air pipe 34 is connected with a gas storage tank for providing compressed gas. When the storage tank 2 feeds the spray tank 3, the corresponding compressed air pipe 34 on the storage tank 2 is opened; when the spray tank 3 feeds the feeder 32, the corresponding compressed air pipe 34 on the spray tank 3 is opened, which can increase the conveying speed of the pulverized coal.

[0058] Reference Figure 1 and Figure 3 The coal powder detection and feeding device also includes a sampling tube 4 and a separation tube 5. The sampling tube 4 is tilted in the vertical direction, and the separation tube 5 is vertically arranged. One end of the sampling tube 4 is connected to the feeding pipe 1, and the other end is connected to the separation tube 5. A sampling control valve 41 is arranged on the sampling tube 4, and the sampling control valve 41 adopts a gate valve or a solenoid valve. When the sampling operation is performed, the sampling control valve 41 is opened, and part of the coal powder in the feeding pipe 1 will flow into the separation tube 5 along the sampling tube 4, completing the coal powder sampling.

[0059] Reference Figure 4 and Figure 5 A total weight detection mechanism 6 is provided on the inner wall of the separation tube 5. The total weight detection mechanism 6 is located on the inner wall of the separation tube 5 close to the sampling tube 4, and the total weight detection mechanism 6 is located below the connection between the sampling tube 4 and the separation tube 5 in the vertical direction.

[0060] Reference Figure 4 and Figure 5 , the total weight detection mechanism 6 includes a support plate 61, a rotating drive member 62, a weighing device 63 and a placing plate 64. The support plate 61 is arranged horizontally, and one end thereof facing the sampling tube 4 is rotatably connected to the inner wall of the separation tube 5. When the support plate 61 is in a horizontal state, it can just collect the test sample transported from the sampling tube 4; the rotating drive member 62 is used to drive the support plate 61 to flip up and down in the vertical direction, the weighing device 63 is arranged on the support plate 61, and the placing plate 64 is arranged on the weighing device 63. A hidden groove 65 is provided on the inner wall of the separation tube 5, and the rotating drive member 62 is arranged in the hidden groove 65 as a whole. When the rotating drive member 62 drives the support plate 61 to rotate to vertical, the placing plate 64 is flush with the inner wall of the separation tube 5. This can reduce the obstruction of the total weight detection mechanism 6 to the movement of the coal powder, thereby improving the detection accuracy of the coal powder.

[0061] Specifically, refer to Figure 4 and Figure 5 The rotation driving member 62 includes an oblique support rod 621, a vertical guide rod 622, a slider 623 and a vertical driver 624. The vertical guide rod 622 is supported in a hidden groove 65. The slider 623 is slidably connected to the vertical guide rod 622. One end of the oblique support rod 621 is rotatably connected to the lower side of the support plate 61, and the other end is rotatably connected to the slider 623. The vertical driver 624 is arranged in a vertical posture in the hidden groove 65, and the driving rod of the vertical driver 624 is movably connected to the slider 623. In this embodiment, the vertical driver 624 adopts a cylinder.

[0062] Driven by the vertical driver 624 , the slider 623 moves up and down in the vertical direction, and the oblique support rod 621 can drive the support plate 61 to rotate, so that the support plate 61 can switch between the horizontal state and the vertical state.

[0063] When the coal powder sampled by the sampling tube 4 falls onto the placement plate 64, the weighing device 63 realizes the first weighing of the coal powder. After the weighing is completed, the rotating driving member 62 drives the weighing device 63 to rotate vertically, and the coal powder falls into the separation tube 5. In this embodiment, the weighing device 63 adopts a digital weighing sensor; the size of the placement plate 64 is designed according to actual requirements.

[0064] Reference Figure 3 and Figure 4 A separation assembly 51 is arranged in the separation tube 5 , an air supply mechanism 7 is arranged at the lower end of the separation tube 5 , and a collection and weighing mechanism 8 is arranged at the upper end of the separation tube 5 .

[0065] Reference Figure 3 and Figure 4 In this embodiment, the separation component 51 includes a spiral blade 511, which is located on the upper side of the connection between the sampling tube 4 and the separation tube 5 in the vertical direction. The spiral blade 511 is axially arranged in the vertical direction. The outer wall of the spiral blade 511 is fixedly connected to the inner wall of the separation tube 5, and a spiral ascending flow channel 512 is formed between the spiral blade 511 and the inner wall of the separation tube 5. In addition, the spiral ascending flow channel 512 can also be formed by a spiral ascending pipe. The sampling tube 4 and the air supply mechanism 7 are both connected to the lower end of the spiral ascending flow channel 512, and the collection and weighing mechanism 8 is connected to the upper end of the spiral ascending flow channel 512.

[0066] Reference Figure 3 and Figure 4After the air supply mechanism 7 fluidizes the coal powder, the fluidized coal powder flows along the spiral ascending flow channel 512. During this process, under the action of gravity, centrifugal force and inertia, the coal powder with larger particles will fall onto the spiral blades 511, and then fall back to the bottom of the separation tube 5 along with the spiral blades 511, while the coal powder with smaller particles will smoothly pass through the spiral ascending flow channel 512 under the action of the airflow and be sent to the collection and weighing mechanism 8. This can achieve the separation of coarse coal powder and fine coal powder.

[0067] In this embodiment, refer to Figure 3 and Figure 4 A plurality of vibrators 9 are arranged on the outer wall of the separation tube 5 , which can shake the coarse coal powder settled on the spiral blades 511 to the bottom of the separation tube 5 , thereby reducing the residual coarse coal powder on the spiral blades 511 .

[0068] Reference Figure 3 and Figure 4 The air supply mechanism 7 includes an air supply pipe 71, a first fan 72, and a coarse powder weighing assembly 73. A connecting pipe 74 is arranged on the side wall of the air supply pipe 71. The connecting pipe 74 is connected to the air supply pipe 71, and the connecting pipe 74 is axially arranged perpendicular to the axial direction of the air supply pipe 71. One end of the air supply pipe 71 is connected to the first fan 72, and the other end is connected to the coarse powder weighing assembly 73. The lower end of the separation pipe 5 is connected to the connecting pipe 74.

[0069] Reference Figure 3 and Figure 4 Through the cooperation of the first fan 72, the air supply pipe 71 and the connecting pipe 74, a vertical upward airflow can be injected into the separation pipe 5, so that the coal powder can be fluidized, and the fluidized coal powder passes through the separation component 51 to achieve coal powder separation. After the coal powder is separated, the first fan 72 is turned off, and the coarse coal powder automatically falls to the bottom of the separation pipe 5 and automatically falls into the air supply pipe 71. At this time, the first fan 72 is started, and the first fan 72 sends the coarse coal powder into the coarse powder weighing component 73, which can detect the weight of the coal powder with larger particles.

[0070] Specifically, refer to Figure 3 and Figure 4 , an anti-suction screen plate 711 is provided in the air supply pipe 71, and the anti-suction screen plate 711 is located between the connecting pipe 74 and the first fan 72 along the axial direction of the air supply pipe 71. A weighing control valve 712 is provided on the air supply pipe 71, and the weighing control valve 712 is located between the connecting pipe 74 and the coarse powder weighing assembly 73 along the axial direction of the air supply pipe 71. The setting of the anti-suction screen plate 711 can prevent the coal powder from falling into the first fan 72; the weighing control valve 712 can control the connection and disconnection between the air supply pipe 71 and the coarse powder weighing assembly 73, so as to prevent part of the coal powder from being directly blown into the coarse powder weighing assembly 73 when the coal powder is separated.

[0071] Specifically, refer to Figure 4, a powder collecting hopper 52 is provided at the lower end of the separation tube 5. The powder collecting hopper 52 is vertically arranged. A powder collecting groove 521 is provided through the powder collecting hopper 52. The upper opening area of ​​the powder collecting groove 521 is larger than the lower opening area of ​​the powder collecting groove 521. A powder guiding pipe 522 is provided at the lower side of the powder collecting hopper 52. The axial direction of the powder guiding pipe 522 is arranged along the vertical direction. The upper end of the powder guiding pipe 522 is fixedly connected to the powder collecting hopper 52. The powder guiding pipe 522 is connected to the powder collecting groove 521. The upper side of the powder collecting hopper 52 is coaxially connected to the separation tube 5, and the lower end of the powder guiding pipe 522 is coaxially connected to the connecting pipe 74. The matching arrangement of the powder collecting hopper 52 and the powder guiding pipe 522 facilitates the collection of coal powder settled in the separation tube 5, thereby preventing part of the coal powder from remaining at the bottom of the separation tube 5.

[0072] Reference Figure 3 and Figure 4 The collecting and weighing mechanism 8 includes a collecting tube 81 and a fine powder weighing assembly 82 . One end of the collecting tube 81 is connected to the upper end of the separation tube 5 , and the other end of the collecting tube 81 is connected to the fine powder weighing assembly 82 .

[0073] After the coal powder is separated, the fine coal powder continues to rise under the action of the airflow and enters the collecting pipe 81, and is then sent to the fine powder weighing assembly 82, which can detect the weight of the fine coal powder.

[0074] In this embodiment, refer to Figure 3 The coarse powder weighing assembly 73 and the fine powder weighing assembly 82 have the same structure, and this embodiment is described by taking the fine powder weighing assembly 82 as an example.

[0075] Reference Figure 3 and Figure 6 The fine powder weighing assembly 82 includes a mounting tube 821, a weighing tube 822 and a plurality of weighing pieces 823. The mounting tube 821 is vertically arranged, and the plurality of weighing pieces 823 are all arranged on the inner side wall of the mounting tube 821, and the weighing pieces 823 are arranged in sequence along the circumference of the mounting tube 821. The mounting tube 821 is sleeved on the outer side of the weighing tube 822, and the weighing tube 822 is slidably connected with the inner side wall of the mounting tube 821 along the vertical direction. The plurality of weighing pieces 823 are arranged around the weighing tube 822, and the upper side of the plurality of weighing pieces 823 supports the weighing tube 822. In this embodiment, the weighing piece 823 adopts a pressure sensor or a weighing metering sensor.

[0076] The upper end of the installation tube 821 is connected to one end of the collection tube 81, and the lower end of the weighing tube 822 is provided with a sealing control valve 8221. In this embodiment, the sealing control valve 8221 adopts a plug valve or a solenoid valve. A plurality of micro holes are provided on the side wall of the installation tube 821 and the side wall of the weighing tube 822.

[0077] Reference Figure 3 and Figure 6When the sealing control valve 8221 closes the weighing tube 822, the airflow carrying coal powder in the collection tube 81 will flow into the weighing tube 822. At this time, under the action of the weighing tube 822 and the installation tube 821, the coal powder remains in the weighing tube 822, which can realize the collection of coal powder. After the coal powder is collected, the weight of the collected fine coal powder can be determined by the weighing member 823. The coarse powder weighing assembly 73 can also realize the weight of the coarse coal powder.

[0078] In this embodiment, refer to Figure 3 and Figure 6 The outer wall of the mounting tube 821 and the outer wall of the load-bearing tube are also provided with a vibrator 9. The provision of the vibrator 9 can reduce the residual coal powder on the inner wall of the mounting tube 821, and also facilitate the unloading of the weighing tube 822 after weighing is completed.

[0079] Reference Figure 3 and Figure 6 A reflux mechanism 10 is also provided between the fine powder weighing assembly 82 and the feed pipe 1. The reflux mechanism 10 includes a reflux pipe 101. The reflux pipe 101 is arranged in a horizontal direction and is located at the lower side of the weighing tube 822. An auxiliary pipe 103 is arranged on the side wall of the reflux pipe 101. The auxiliary pipe 103 is arranged vertically. The lower end of the auxiliary pipe 103 is connected to the side wall of the reflux pipe 101. The upper end of the auxiliary pipe 103 is coaxially connected to the mounting pipe 821, and the weighing tube 822 is connected to the auxiliary pipe 103.

[0080] Reference Figure 1 and Figure 3 One end of the reflux pipe 101 is connected to a reflux gas source 102, and the other end is connected to the feed pipe 1. In this embodiment, the reflux gas source 102 is a compressor.

[0081] Reference Figure 1 and Figure 3 After the fine powder weighing assembly 82 weighs the fine coal powder, the sealing control valve 8221 is opened, and the first fan 72 is turned on. At this time, the coal powder in the weighing tube 822 falls into the return pipe 101 under the action of its own gravity and the air pressure generated by the first fan 72, and then the coal powder is blown back into the feeding pipe 1 through the return air source 102 to realize the recycling of the coal powder. After the coarse powder weighing assembly 73 weighs the coarse coal powder, the coal powder is directly discharged.

[0082] Reference Figure 3 The pulverized coal detection and feeding device further comprises a back-blowing mechanism 20, which comprises a second fan 201, a back-blowing pipeline 202 and a back-blowing control valve 203. One end of the back-blowing pipeline 202 is connected to the second fan 201, and the other end is connected to the upper end of the separation pipe 5. The back-blowing control valve 203 is arranged on the back-blowing pipeline 202. In this embodiment, the back-blowing drive member adopts a gate valve or a solenoid valve.

[0083] After the first fan 72 is turned on and all the coal powder is separated, the first fan 72 is turned off, and the second fan 201 is turned on for backblowing. At this time, the coal powder attached to the inner wall is collected and blown back into the weighing tube 822, and the coal powder attached to the spiral blades 511 is blown back to the bottom of the separation tube 5. This can reduce the residual coal powder on the inner wall of each pipeline and improve the accuracy of the detection result. In addition, the first fan 72 and the second fan 201 can work alternately for multiple times, thereby improving the separation effect of the coal powder.

[0084] The implementation principle of the embodiment of the present application is as follows: when feeding the spray gun on the smelting furnace, the coal powder in the spray tank 3 will be continuously transported to the corresponding spray gun under the action of the feeder 32; and when the coal powder in the spray tank 3 is used up, the coal powder in the storage tank 2 will be transported to the spray tank 3, and ensure that the coal powder in the storage tank 2 can fill the spray tank 3; and after the coal powder in the storage tank 2 is transported to the spray tank 3, the feed pipe 1 transports the coal powder to the storage tank 2 again, and the coal powder is temporarily stored in the spray tank 3.

[0085] When using the feed pipe 1 to transport coal powder to the storage tank 2, the sampling tube 4 is opened to transport coal powder to the separation tube 5. Since the coal powder reserves in the storage tank 2 and the injection tank 3 are both in tons, and in order to ensure the accuracy of the detection structure, the sampling tube 4 needs to sample as much coal powder as possible.

[0086] During the sampling process of the sampling tube 4, the total weight detection mechanism 6 weighs the sampled coal powder. After the sampling is completed, the sampling tube 4 is closed, and the total weight detection mechanism 6 pours the coal powder to the bottom of the separation tube 5. After that, the first fan 72 and the second fan 201 are turned on alternately in sequence, and repeated for many times to achieve coal powder separation, and at this time, the fine coal powder falls into the fine powder weighing component 82. After the separation of coal powder is completed, the coarse coal powder falls to the bottom of the separation tube 5, and then falls into the air supply pipe 71. At this time, the first fan 72, the second fan 201 and the weighing control valve 712 are turned on, and the coarse coal powder is transported to the coarse powder weighing component 73. After the coarse powder weighing component 73 completes weighing, the coarse coal powder is discharged; and after the fine powder weighing component 82 is completed, the fine coal powder is refluxed to the feed pipe 1 through the reflux mechanism 10.

[0087] Through the detection results of the coarse powder weighing component 73, the fine powder weighing component 82 and the total weight detection mechanism 6, the proportion of coarse coal powder and fine coal powder in the coal powder in the storage tank 2 can be calculated, thereby detecting the quality of the coal powder.

[0088] This embodiment also discloses a method for detecting and feeding coal powder for laterite nickel ore smelting, comprising the following steps:

[0089] S1. The conveying tank conveys coal powder into the storage tank 2 and performs coal powder detection.

[0090] Specifically, coal powder detection includes the following steps:

[0091] S11. Take samples of coal powder and weigh the coal powder samples.

[0092] When the feed pipe 1 is conveying coal powder, the sampling tube 4 is opened to convey the coal powder sample into the separation tube 5, and the total weight detection mechanism 6 detects the weight of the coal powder sample. When the weight of the coal powder sample meets the requirement, the sampling tube 4 is closed, and the total weight detection mechanism 6 pours the weighed coal powder into the separation tube 5.

[0093] S12, separating the coal powder, and collecting and weighing the separated fine coal powder.

[0094] Start the first fan 72. At this time, the airflow blown by the first fan 72 carries the coal powder upward. After passing through the separation component 51, the coarse coal powder sinks to the separation component 51 and finally falls to the bottom of the separation tube 5, while the fine coal powder is carried by the airflow to the collection pipe 81, and the fine coal powder is stored in the fine powder weighing component 82, and the weighing detection of the fine coal powder is carried out in real time.

[0095] S13, the coal powder is back-blown to blow the coal powder adhering to the separation tube 5 to the bottom of the separation tube 5 again.

[0096] The first fan 72 is turned off, and the second fan 201 is turned on. At this time, the airflow of the second fan 201 blows the coal powder attached to the separation component 51 to the bottom of the separation tube 5.

[0097] S14. Repeat the above steps S12-S13 for multiple times until the weighing result of the fine coal powder does not change significantly.

[0098] S15. Collect and weigh the coarse coal powder.

[0099] The first fan 72, the second fan 201 and the weighing control valve 712 are turned on to blow the coarse coal powder into the coarse powder weighing assembly 73, and the coarse coal powder is weighed.

[0100] S16, the coarse coal powder is discharged, and the fine coal powder flows back into the feed pipe 1.

[0101] The sealing control valve 8221 in the coarse powder weighing assembly 73 is opened to discharge the coarse coal powder. The sealing control valve 8221 in the fine powder weighing assembly 82 is opened to discharge the fine coal powder into the return pipe 101, and then the fine coal powder flows back into the feed pipe 1 through the return pipe 101 under the cooperation of the return air source 102 and the first fan 72.

[0102] S17. Calculate the ratio of coarse coal powder to fine coal powder based on the total weight of the tested coal powder sample, the weight of coarse coal powder and the weight of fine coal powder, so as to determine the quality of the coal powder.

[0103] S2, the storage tank 2 transports pulverized coal into the injection tank 3.

[0104] S3. The coal powder in the spray tank 3 is fed into the feeder 32, and the feeder 32 transports the coal powder to the corresponding spray gun.

[0105] Specifically, after step S2 is completed, step S3 and step S1 are performed synchronously.

[0106] The implementation principle of the embodiment of the present application is: when the coal powder is transported to the storage tank 2 through the feed pipe 1, the quality of the coal powder is automatically detected at irregular intervals, and the coal powder is temporarily stored in the storage tank 2, so that after the detection result comes out, the treatment method of the coal powder in the storage tank 2 can be determined in time. When there is a major problem with the quality of the coal powder, it can be discovered in time and the transportation of the coal powder can be stopped quickly, thereby reducing the risk of gun blockage and improving the smelting efficiency of laterite nickel ore.

[0107] Example 2: A coal powder detection and feeding device for laterite nickel ore smelting, referring to Figure 7 The difference between this embodiment and embodiment 1 is that the separation component 51 includes a separation screen plate 513, and the separation screen plate 513 is connected to the inner wall of the separation tube 5.

[0108] The implementation principle of the embodiment of the present application is: through the setting of the separation screen plate 513, when the airflow generated by the first fan 72 carries the coal powder through the separation screen plate 513, the small holes on the separation screen plate 513 can separate the coarse coal powder from the fine coal powder.

[0109] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A coal powder detection and feeding device for laterite nickel ore smelting, characterized in that: include: A material conveying pipe (1), a material storage tank (2) and a spray tank (3), wherein the upper end of the material storage tank (2) is connected to the material conveying pipe (1), and the lower end is connected to a secondary material pipe (22), and a feed control valve is provided on the secondary material pipe (22); the upper end of the spray tank (3) is connected to the secondary material pipe (22), and the lower end is connected to a feeder (32); The feed pipe (1) is connected to a sampling pipe (4), the sampling pipe (4) is connected to a separation pipe (5), and a sampling control valve (41) is provided on the sampling pipe (4); The separation tube (5) is arranged vertically, and a total weight detection mechanism (6) is arranged inside the separation tube (5), wherein the total weight detection mechanism (6) is used to detect the weight of the coal powder transported into the separation tube (5) by the sampling tube (4); The total weight detection mechanism (6) comprises a support plate (61), a rotating drive member (62), a weighing device (63) and a storage plate (64); the support plate (61) is arranged horizontally, and one end of the support plate (61) facing the sampling tube (4) is rotatably connected to the inner wall of the separation tube (5); when the support plate (61) is in a horizontal state, the detection sample transported from the sampling tube (4) can be collected; the rotating drive member (62) is used to drive the support plate (61) to flip up and down in the vertical direction; the weighing device (63) is arranged on the support plate (61), and the storage plate (64) is arranged on the weighing device (63); a hidden groove (65) is provided on the inner wall of the separation tube (5) , the rotating driving member (62) is arranged in its entirety in the hidden groove (65); the rotating driving member (62) comprises an oblique support rod (621), a vertical guide rod (622), a slider (623) and a vertical driver (624); the vertical guide rod (622) is supported in the hidden groove (65); the slider (623) is slidably connected to the vertical guide rod (622); one end of the oblique support rod (621) is rotatably connected to the lower side of the support plate (61); the other end is rotatably connected to the slider (623); the vertical driver (624) is arranged in a vertical posture in the hidden groove (65); the driving rod of the vertical driver (624) is movably connected to the slider (623); A separation component (51) for separating coal powder is arranged in the separation tube (5), and the separation component (51) is located on the upper side of the total weight detection mechanism (6); The bottom of the separation tube (5) is connected to an air supply mechanism (7) for fluidizing the coal powder and conveying the fluidized coal powder upwards, and the top of the separation tube (5) is connected to a collection and weighing mechanism (8) for collecting the fluidized coal powder and weighing the coal powder; The air supply mechanism (7) comprises an air supply pipe (71), the air supply pipe (71) is arranged horizontally, the air supply pipe (71) is located at the lower side of the separation pipe (5), and the lower end of the separation pipe (5) is connected to the air supply pipe (71); One end of the air supply pipe (71) is connected to a first fan (72), and the other end is connected to a coarse powder weighing assembly (73). A weighing control valve (712) is provided on the air supply pipe (71), and the weighing control valve (712) is used to control the connection or sealing between the first fan (72) and the coarse powder weighing assembly (73).

2. A coal powder detection and feeding device for laterite nickel ore smelting according to claim 1, characterized in that: The separation component (51) comprises a spiral blade (511), the spiral blade (511) being vertically arranged in the separation tube (5), the outer side wall of the spiral blade (511) being connected to the inner side wall of the separation tube (5), and the spiral blade (511) forming a spiral ascending flow channel (512) in the separation tube (5) for separating coal powder.

3. A coal powder detection and feeding device for laterite nickel ore smelting according to claim 2, characterized in that: The separation component (51) comprises a separation screen plate (513), and the separation screen plate (513) is connected to the inner wall of the separation tube (5).

4. A coal powder detection and feeding device for laterite nickel ore smelting according to claim 2 or 3, characterized in that: A plurality of vibrators (9) are arranged on the outer side wall of the separation tube (5).

5. The coal powder detection and feeding device for laterite nickel ore smelting according to claim 1 is characterized in that: The collecting and weighing mechanism (8) comprises a collecting tube (81) and a fine powder weighing assembly (82), and both ends of the collecting tube (81) are respectively connected to the separation tube (5) and the fine powder weighing assembly (82); The fine powder weighing assembly (82) comprises a mounting tube (821), a weighing tube (822) and a weighing piece (823); the mounting tube (821) is arranged vertically, the mounting tube (821) is sleeved on the outside of the weighing tube (822), the weighing piece (823) is arranged on the inner wall of the mounting tube (821), and the upper side of the weighing piece (823) supports the weighing tube (822); the weighing tube (822) is used to collect coal powder, and the weighing piece (823) is used to detect the weight of the weighing tube (822); A plurality of air-permeable micropores are provided on the side wall of the installation tube (821) and the side wall of the weighing tube (822).

6. A coal powder detection and feeding device for laterite nickel ore smelting according to claim 5, characterized in that: A sealing control valve (8221) is provided at the lower end of the weighing tube (822), and the sealing control valve (8221) is used to control the opening or closing of the weighing tube (822).

7. A coal powder detection and feeding device for laterite nickel ore smelting according to claim 6, characterized in that: A reflux mechanism (10) is provided at the lower end of the weighing tube (822), the reflux mechanism (10) comprising a reflux pipe (101) and a reflux gas source (102), the reflux pipe (101) being arranged horizontally, and two ends of the reflux pipe (101) being respectively connected to the reflux gas source (102) and the feed pipe (1); The upper side of the return pipe (101) is connected to an auxiliary pipe (103), the auxiliary pipe (103) is coaxially connected to the mounting pipe (821), and the lower end of the weighing pipe (822) is located inside the auxiliary pipe (103).

8. A coal powder detection and feeding device for laterite nickel ore smelting according to claim 6, characterized in that: The device further comprises a back-blowing mechanism (20), the back-blowing mechanism (20) comprising a second fan (201) and a back-blowing pipeline (202), the two ends of the back-blowing pipeline (202) being respectively connected to the separation pipe (5) and the second fan (201), and a back-blowing control valve (203) is provided on the back-blowing pipeline (202).

9. A method for detecting coal powder feeding for laterite nickel ore smelting, using a coal powder detection and feeding device for laterite nickel ore smelting according to any one of claims 1 to 8 to feed coal powder, characterized in that: The following steps are involved: S1, the conveying pipe (1) conveys the pulverized coal into the storage tank (2), and performs pulverized coal detection; S11, sampling the coal powder and weighing the coal powder sample; S12, separating the coal powder, and collecting and weighing the separated fine coal powder; S13, back-blowing the coal powder to blow the coal powder adhering to the separation tube (5) back to the bottom of the separation tube (5); S14, repeating steps S12-S13 for multiple times until the weighing result of the fine coal powder does not change significantly; S15, collecting and weighing the coarse coal powder; S16, the coarse coal powder is discharged, and the fine coal powder flows back into the conveying pipe (1); S17, calculating the ratio of coarse coal powder to fine coal powder according to the total weight of the tested coal powder sample, the weight of coarse coal powder and the weight of fine coal powder, so as to determine the quality of the coal powder; S2, the storage tank (2) conveys pulverized coal into the injection tank (3); S3. The coal powder in the spray tank (3) is fed into a feeder (32), and the feeder (32) transports the coal powder to a corresponding spray gun.

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