Tin smelting top-blown slag component online detection system

Abstract

The utility model discloses a tin smelting top-blown slag component online detection system, which belongs to the technical field of intelligent smelting of nonferrous metals and comprises an LIBS (laser-induced breakdown spectroscopy) detection system and a sampling rod dipping system. The sampling rod dipping system comprises a top blowing furnace, a smoke cleaning fan, a sampling rod, an anti-swing limiting block, a steel wire rope, a winch, a fixed bracket and a cover plate; and the LIBS detection system comprises an industrial probe and a spectrograph. A sampling rod dipping system is originally created, tin-rich slag in the furnace kiln can be sampled in any smelting period, and slag components can be obtained in real time by coupling an LIBS detection system. The application of the industrial probe can realize long-distance monitoring and detection, greatly reduces the requirements of on-site manual observation operation, improves the working efficiency, increases the personnel safety, and improves the working environment. Burdening and personnel operation can be adjusted in real time according to a detection result, accurate regulation and control of molten pool smelting are facilitated, and stability and smelting efficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent smelting of non-ferrous metals, and more specifically, to an on-line detection system for the composition of top-blown slag in tin smelting. Background Art

[0002] The top-blown submerged lance smelting technology is a typical injection smelting technology. In the tin top-blown furnace, washed fine coal and anthracite are often used as fuel and reducing agent. The basic process is that tin concentrate, flux, and reducing coal are transported to the top-blown furnace by belt, and coal, oxygen, and primary air are injected into the furnace through a special lance, forming a violently tumbling molten pool in the furnace, and producing crude tin through reduction smelting.

[0003] The composition of materials is the core parameter of the metallurgical process, and its real-time detection and accuracy are closely related to process control and smelting energy consumption. The detection and analysis of material composition run through the entire metallurgical process, from raw material entering the factory to product output. In particular, during the smelting process, the control of the content of elements such as Sn, Fe, Si, Ca, Mg, and Al in the tin-rich slag is crucial for improving smelting efficiency and effectively controlling the furnace condition. Therefore, it is very important to accurately detect the content of elements in real time during the production process of the slag-making (tin-rich slag) process.

[0004] Currently, most top-blown furnaces use fluorescence analysis to analyze the rich slag. The fluorescence analysis can obtain the analysis results about 30 minutes after sending the sample, which lags behind in guiding production. The inability to timely feedback the slag composition will lead to a series of problems such as over-reliance on the experience of operators, low automation level, and high production costs. At the same time, due to the inaccurate assessment of the system metal balance, the deviation of economic indicators and benefit calculation is relatively large. In addition, the frequency of rich slag analysis is high, reaching up to 5 times per furnace period, which greatly increases the analysis cost and the workload of staff.

[0005] Another common detection method is based on LIBS technology, which can directly detect the composition of high-temperature melt in the launder in real time. Although this method is efficient, convenient, and can quickly detect the composition of high-temperature melt online, this detection method is easily affected by the on-site working conditions, and factors such as flue gas, splashing, large liquid surface fluctuations, and surface dross will interfere with the detection results.

[0006] Therefore, how to develop an on-line detection system for the composition of top-blown slag in tin smelting is an urgent problem to be solved by those skilled in the art. Content of the Utility Model

[0007] In view of this, the utility model provides an on-line detection system for the composition of top-blown slag in tin smelting.

[0008] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0009] An on-line detection system for the composition of top-blown slag in tin smelting, comprising a LIBS detection system and a sampling rod dipping system; the above-mentioned sampling rod dipping system includes a top-blown furnace, a fume extraction fan, a sampling rod, an anti-sway limit block, a steel wire rope, a winch, a fixed bracket and a cover plate;

[0010] The top end of the above-mentioned sampling rod is connected to the winch through a steel wire rope. One end of the fixed bracket is fixedly installed with an anti-sway limit block, and the anti-sway limit block is provided with a circular limit hole. The diameter of the sampling rod is adapted to the aperture of the circular limit hole;

[0011] The top of the above-mentioned top-blown furnace is provided with a sampling hole, and a cover plate is provided at the top of the sampling hole. The diameter of the sampling rod is adapted to the aperture of the sampling hole. The sampling rod moves up and down through the circular limit hole and / or the sampling hole;

[0012] The length of the above-mentioned sampling rod is longer than the distance from the circular limit hole to the industrial probe, and the length of the sampling rod is longer than the distance from the sampling hole to the bottom of the tin-rich slag bath in the top-blown furnace;

[0013] The above-mentioned fume extraction fan is fixedly installed above the top-blown furnace near the sampling hole and on one side of the sampling rod;

[0014] The above-mentioned LIBS detection system includes an industrial probe and a spectrometer. The above-mentioned industrial probe is fixedly installed above the fume extraction fan and on one side of the sampling rod. A laser is installed on one side inside the industrial probe, and an optical fiber probe is installed on the other side. The inlet end of the optical fiber probe is aligned with the optical signal emitted by the laser-induced plasma, and the outlet end of the optical fiber probe is connected to the spectrometer.

[0015] Further, the above-mentioned optical fiber probe includes a collimating lens and an optical fiber. The collimating lens is installed inside the industrial probe on one side and is aligned with the optical signal emitted by the laser-induced plasma. One end face of the optical fiber is located at the focal point of the collimating lens, and the other end of the optical fiber is connected to the spectrometer.

[0016] Beneficial effects of adopting the above further technical solution: The optical signal emitted by the laser-induced plasma is collected through the collimating lens.

[0017] Further, it further includes a remote control terminal. The above-mentioned spectrometer, fume extraction fan and winch are respectively electrically connected to the remote control terminal; the cover plate is connected to the remote control terminal.

[0018] Beneficial effects of adopting the above further technical solution: Realize the on-line automatic detection of the composition of top-blown slag in this application, realize remote monitoring and detection, greatly reduce the need for on-site manual observation and operation, reduce labor costs, improve work efficiency, increase personnel safety, and improve the working environment.

[0019] Furthermore, one side of the above-mentioned cover plate is connected with a cylinder for driving it to open or close the opening of the sampling hole. The piston of the cylinder is connected with the cover plate through a connecting piece, and the control valve on the air supply pipe connected to the cylinder is connected with the remote control terminal.

[0020] The beneficial effects of the present utility model: The present utility model is provided with a smoke clearing fan to disperse the small-flow smoke overflowing around the industrial probe and the sampling rod along with the sampling hole, preventing the smoke from interfering with the laser detection.

[0021] The present utility model is provided with anti-swing limit blocks. The sampling rod can effectively limit its swing through the circular limit holes of the anti-swing limit blocks.

[0022] The present utility model creatively proposes a system for dipping stanniferous slag with different depths based on a liftable sampling rod, which can dip stanniferous slag in the furnace at any moment during the smelting process. Further, through the LIBS technology, the composition of the slag on the sampling rod can be obtained immediately. Through this system, the problem of lag in slag composition detection is fundamentally solved. Based on the real-time feedback of the slag composition, the core smelting parameters such as the material ratio and the insertion depth of the lance can be timely adjusted, so as to ensure the smelting quality, improve the stability of the furnace condition and the degree of smelting control.

[0023] The system of the present utility model mainly uses high-energy pulsed laser to strike the surface of an object, so that the surface of the object is quickly heated to vaporization, and the electrons of the elements in the object are unbalanced. By collecting the light emitted by the energy generated when the elements return to the original state, qualitative and quantitative analysis is carried out based on the reaction intensity of elements in different wavelength bands.

[0024] The present utility model can accurately and quickly detect the main elements of Sn, Fe, Si, Ca and the impurity metal elements of Mg, Al in the stanniferous slag, monitor the reduction reaction in the furnace, and the detection results can be obtained within 1 - 3 minutes after the detection. The core smelting parameters such as the material ratio and the insertion depth of the lance can be timely adjusted, so as to ensure the smelting quality, improve the stability of the furnace condition and the degree of smelting control. At the same time, it can solve the problems of long detection cycle of traditional rich slag analysis, inability to timely know the element reaction situation and slag formation situation in the furnace, low work efficiency, increased production cost and workload of personnel.

[0025] The present utility model creatively proposes a system for dipping stanniferous slag with different depths based on a liftable sampling rod, which can dip stanniferous slag in the furnace at any moment during the smelting process. Further, through the LIBS technology, the composition of the slag on the sampling rod can be obtained immediately. Through this utility model, the problem of lag in slag composition detection is fundamentally solved. Based on the real-time feedback of the slag composition, the core smelting parameters such as the material ratio and the insertion depth of the lance can be timely adjusted, so as to ensure the smelting quality, improve the stability of the furnace condition and the degree of smelting control.

[0026] In summary, the present utility model has the following beneficial effects:

[0027] 1) Real-time nature of detection results: The present utility model uniquely creates a sampling rod dipping system, which can sample the tin-rich slag inside the furnace during any smelting cycle, and coupling with the LIBS detection system can obtain the slag composition in real time.

[0028] 2) Accuracy of detection results: The detection results of this utility model are verified by fluorescence method and chemical method, meeting the error index requirements: the absolute deviation of Sn is less than 2%, the absolute deviation of Fe is less than 1.5%, the absolute deviation of Si is less than 1%, the absolute deviation of Ca is less than 0.5%, the absolute deviation of Al is less than 0.8%, and the absolute deviation of Mg is less than 0.4%.

[0029] 3) Cost reduction and efficiency improvement: The application of industrial probes can achieve remote monitoring and detection, greatly reducing the need for on-site manual observation and operation, reducing labor costs, improving work efficiency, increasing personnel safety, and improving the working environment. At the same time, according to the detection results, the batching and personnel operations can be adjusted in real time, which helps to accurately control the bath smelting, improve stability and smelting efficiency. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the on-line detection system for the composition of the top-blown slag in tin smelting of the present utility model.

[0031] Figure 2 It is a schematic structural diagram of the optical fiber probe of the present utility model.

[0032] Figure 3 It is a schematic structural diagram of the cover plate of the on-line detection system for the composition of the top-blown slag in tin smelting of the present utility model.

[0033] Among them, 1-top-blown furnace, 2-smoke cleaning fan, 3-sampling rod, 4-anti-swing limit block, 5-steel wire rope, 6-winch, 7-fixed bracket, 8-cover plate, 9-circular limit hole, 10-sampling hole, 11-industrial probe, 12-tin-rich slag bath, 13-tin-rich slag, 14-spectrometer, 15-laser, 16-optical fiber probe, 17-collimating lens, 18-optical fiber, 19-remote control terminal, 20-cylinder, 21-piston, 22-connecting piece. Detailed Embodiment

[0034] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] Online detection system for the composition of top-blown slag in tin smelting, including LIBS detection system and sampling rod dipping system; the sampling rod dipping system includes a top-blown furnace 1, a fume extraction fan 2, a sampling rod 3, an anti-sway limit block 4, a steel wire rope 5, a winch 6, a fixed bracket 7 and a cover plate 8;

[0036] The top end of the sampling rod 3 is connected to the winch 6 through the steel wire rope 5. One end of the fixed bracket 7 is fixedly installed with an anti-sway limit block 4. The anti-sway limit block 4 is provided with a circular limit hole 9, and the diameter of the sampling rod 3 is adapted to the aperture of the circular limit hole 9;

[0037] The top of the top-blown furnace 1 is provided with a sampling hole 10. The top of the sampling hole 10 is provided with a cover plate 8. The diameter of the sampling rod 3 is adapted to the aperture of the sampling hole 10. The sampling rod 3 moves up and down through the circular limit hole 9 and / or the sampling hole 10;

[0038] The fume extraction fan 2 is fixedly installed above the top-blown furnace 1 near the sampling hole 10 and on one side of the sampling rod 3;

[0039] The LIBS detection system includes an industrial probe 11 and a spectrometer 14. The industrial probe 11 is fixedly installed above the fume extraction fan 2 on one side of the sampling rod 3. One side inside the industrial probe 11 is installed with a laser 15, and the other side is installed with an optical fiber probe 16. The inlet end of the optical fiber probe 16 is aligned with the optical signal emitted by the laser 15 to induce plasma, and the outlet end of the optical fiber probe 16 is connected to the spectrometer 14;

[0040] The length of the sampling rod 3 is longer than the distance from the circular limit hole 9 to the industrial probe 11, and the length of the sampling rod 3 is longer than the distance from the sampling hole 10 to the bottom of the tin-rich slag bath 12 in the top-blown furnace 1.

[0041] In one embodiment, the optical fiber probe 16 includes a collimating lens 17 and an optical fiber 18. The collimating lens 17 is installed inside the industrial probe 11 on one side to align with the optical signal emitted by the laser 15 to induce plasma. One end face of the optical fiber 18 is located at the focal point of the collimating lens 17, and the other end of the optical fiber 18 is connected to the spectrometer 14.

[0042] In one embodiment, it further includes a remote control terminal 19. The spectrometer 14, the fume extraction fan 2 and the winch 6 are respectively electrically connected to the remote control terminal 19; the cover plate 8 is connected to the remote control terminal 19.

[0043] In one embodiment, one side of the cover plate 8 is connected to a cylinder 20 that drives it to open or close the opening of the sampling hole 10. The piston 21 of the cylinder 20 is connected to the cover plate 8 through a connecting member 22. The control valve on the air supply pipe connected to the cylinder 20 is connected to the remote control terminal 19.

[0044] Working principle of the online detection system for the composition of top-blown slag in tin smelting:

[0045] (1) The hoist 6 is controlled to rotate by the remote control terminal 19, and the sampling rod 3 is lowered to 40-60 cm above the cover plate 8 of the sampling hole 10 of the top-blown furnace 1, and the cover plate 8 is opened by the remote control terminal 19;

[0046] (2) The sampling rod 3 continues to descend and enters the tin-rich slag molten pool 12 in the top-blown furnace 1 through the sampling hole 10. The bottom end of the sampling rod 3 is inserted into the bottom of the tin-rich slag molten pool 12, so that the sampling rod 3 is inserted into the tin-rich slag 13 layer to a depth that covers the thickness of the tin-rich slag 13 layer;

[0047] (3) Since the sampling rod 3 is at room temperature before entering the furnace, the tin-rich slag 13 quickly solidifies into a solid state when cooled, and the sampling rod 3 is lifted. After the sampling rod 3 is pulled out of the top-blown furnace 1, the cover plate 8 is quickly closed;

[0048] (4) Continue to lift the sampling rod 3 and turn on the smoke-clearing fan 2 through the remote control terminal 19 to clear the smoke;

[0049] (5) Continue to lift the sampling rod 3 until the area with the tin-rich slag 13 is close to the industrial probe 11. At this time, the circular limit hole 9 formed in the anti-swing limit block 4 limits the swing of the sampling rod 3, and the sampling rod 3 stops swinging;

[0050] (6) The laser 15 is turned on through the remote control terminal 19, and the sampling rod 3 is slowly raised or lowered. The laser beam emitted by the laser 15 irradiates the surface of the tin-rich slag 13 of the moving sampling rod 3 to generate laser plasma, forming multiple measurement points along a vertical line. The optical signal collected by the optical fiber probe 16 enters the spectrometer 14 through the optical fiber 18 and is converted into spectral data. The spectrometer 14 transmits the spectral data to the remote control terminal 19.

[0051] Example 1

[0052] The method for online detection of the composition of tin smelting top-blown slag comprises the following steps:

[0053] The 4.4×8.6m (inner diameter×height) top-blown furnace 1 is used. The operation cycle is the sampling and testing of the tin-rich slag 13 of one furnace period, and the total feed amount is 130t. It includes three stops for reduction and one slag discharge. Before the start of the furnace period, the reserved molten pool of the top-blown furnace 1 is measured with a sampling rod 3. The slag discharge port is closed when the molten pool height is 500mm. After the slag discharge is completed, the materials are added for reduction smelting according to the batching calculation results.

[0054] (1) When the material accumulates to 40 tons, the hoist 6 is controlled to rotate by the remote control terminal 19, and the sampling rod 3 is lowered to 40 cm above the cover plate 8 of the sampling hole 10 of the top-blown furnace 1, and the cover plate 8 is opened by the remote control terminal 19;

[0055] (2) The sampling rod 3 continues to descend, enters the stanniferous slag bath 12 in the top-blown converter 1 through the sampling hole 10, stays for 3 seconds after the bottom end of the sampling rod 3 is inserted into the bottom of the stanniferous slag bath 12, so that the depth of the sampling rod 3 inserted into the stanniferous slag 13 layer covers the layer thickness of the stanniferous slag 13 layer, and the height of the stanniferous slag 13 wrapped on the sampling rod 3 is 800 mm;

[0056] (3) Lift the sampling rod 3. After the sampling rod 3 is pulled out of the top-blown converter 1, quickly close the cover plate 8;

[0057] (4) Continue to lift the sampling rod 3 and turn on the fume extraction fan 2 through the remote control terminal 19 for fume extraction;

[0058] (5) Continue to lift the sampling rod 3 until the area stained with stanniferous slag 13 is close to the industrial probe 11. At this time, the circular limit hole 9 opened by the anti-swing limit block 4 restricts the swing of the sampling rod 3, the sampling rod 3 stops swinging, and stays for 15 seconds until the stanniferous slag 13 changes from red to black, and the stanniferous slag 13 naturally cools down to 780 °C;

[0059] (6) Turn on the laser 15 through the remote control terminal 19. At the same time, slowly lift or lower the sampling rod 3. The laser beam emitted by the laser 15 irradiates the surface of the stanniferous slag 13 on the moving sampling rod 3 to generate laser plasma, forming multiple measurement points along a vertical line. The number of collected spectra is set to 2000. Each time, 3 points on the surface of the stanniferous slag 13 are detected, and the average value of the 3 points is taken. The first point is detected for 10 seconds, the sampling rod 3 is moved up or down to detect the second point of the rich slag for 10 seconds, and the sampling rod 3 is moved up or down to detect the third point of the rich slag for 10 seconds. The optical signal collected by the optical fiber probe 16 in 2 min enters the spectrometer 14 through the optical fiber 18 and is converted into spectral data, and the spectrometer 14 transmits the spectral data to the remote control terminal 19.

[0060] At this time, the tin and impurity content of the rich slag are as follows: Sn: 19.25%, Fe: 29.58%, Ca: 4.51%, Si: 10.94%. Through this method, the silicate degree K of the stanniferous slag is calculated to be 1.21. Then, 1.2 t / h of quartz is put into the stanniferous slag for silicate degree adjustment (or increase the instantaneous input amount of high-silica materials). Since the tin content in the stanniferous slag is 19.25% and the reducing atmosphere is sufficient, no parameter adjustment is required.

[0061] (7) When the materials accumulate to 80 t, 130 t, stop feeding and reduce for 15 min for the first, second, and third times, and repeat the above steps (1)-(6), and monitor the situation in the furnace in real time.

[0062] According to the utility model, the online detection system and method for detecting the slag composition of the top-blown furnace 1, the detection results are verified by fluorescence method and chemical method, and meet the error index requirements. Through this method, the operation status of the furnace can be mastered at any time, so as to adjust the material ratio and the core smelting parameters such as oxidation and reduction atmosphere, thereby ensuring the smelting quality, improving the stability of the furnace condition and the degree of smelting control. It effectively reduces the coal consumption, smoke rate and improves the direct recovery rate of tin.

[0063] Example 2

[0064] The method for online detection of the composition of tin smelting top-blown slag comprises the following steps:

[0065] The 5×9m (inner diameter×height) top-blown furnace 1 is used. The operation cycle is the sampling and testing of the tin-rich slag 13 of one furnace period, and the total feed volume is 180t. It includes three stops for reduction and one slag discharge. Before the start of the furnace period, the reserved molten pool of the top-blown furnace 1 is measured with a sampling rod 3. The slag discharge port is closed when the molten pool height is 530mm. After the slag discharge is completed, materials are added for reduction smelting according to the batching calculation results.

[0066] (1) When the material accumulates to 40 tons, the hoist 6 is controlled to rotate through the remote control terminal 19, and the sampling rod 3 is lowered to 50 cm above the cover plate 8 of the sampling hole 10 of the top-blown furnace 1, and the cover plate 8 is opened through the remote control terminal 19;

[0067] (2) The sampling rod 3 continues to descend and enters the tin-rich slag molten pool 12 in the top-blown furnace 1 through the sampling hole 10. The bottom end of the sampling rod 3 is inserted into the bottom of the tin-rich slag molten pool 12 and stays there for 3 seconds, so that the sampling rod 3 is inserted into the tin-rich slag 13 layer to a depth that covers the thickness of the tin-rich slag 13 layer. The height of the tin-rich slag 13 wrapped on the sampling rod 3 is 1100 mm.

[0068] (3) lifting the sampling rod 3, and after the sampling rod 3 is pulled out of the top-blown furnace 1, quickly closing the cover plate 8;

[0069] (4) Continue to lift the sampling rod 3 and turn on the smoke-clearing fan 2 through the remote control terminal 19 to clear the smoke;

[0070] (5) Continue to lift the sampling rod 3 until the area with the tin-rich slag 13 is close to the industrial probe 11. At this time, the circular limit hole 9 provided in the anti-sway limit block 4 limits the swing of the sampling rod 3. The sampling rod 3 stops swinging and stays for 11 seconds until the tin-rich slag 13 changes from red to black and the tin-rich slag 13 naturally cools down to 750°C.

[0071] (6) Turn on the laser 15 through the remote control terminal 19, and at the same time slowly raise or lower the sampling rod 3. The laser beam emitted by the laser 15 irradiates the surface of the tin-rich slag 13 on the moving sampling rod 3 to generate laser plasma, forming multiple measurement points along a vertical line. The number of spectral data collected is set to 2000. Each time, 3 points on the surface of the tin-rich slag 13 are detected, and the average value of the 3 points on the surface is taken. The first point on the surface is detected for 10 seconds, the sampling rod 3 is moved up or down to detect the rich slag at the second detection point for 10 seconds, and the sampling rod 3 is moved up or down to detect the rich slag at the third detection point for 10 seconds. The optical signal collected by the optical fiber probe 16 enters the spectrometer 14 through the optical fiber 18 and is converted into spectral data, and the spectrometer 14 transmits the spectral data to the remote control terminal 19.

[0072] At this time, the tin and impurity content in the rich slag are as follows: Sn: 27.47%, Fe: 27.15%, Ca: 5.32%, Si: 14.38%. Through this method, the silica modulus K of the tin-rich slag is calculated to be 1.66. Then, 2t / h of limestone is added to adjust the silica modulus of the tin-rich slag (or reduce the instantaneous input amount of high-silica materials). Since the tin content in the tin-rich slag is 27.47% and the reducing atmosphere is insufficient, the amount of reducing coal is increased from 2.5t / h to 3.5t / h to ensure the reducing atmosphere in the furnace.

[0073] (7) When the materials accumulate to 80t, 130t, and 180t, stop feeding and reduce for 25 minutes for the first, second, and third times, and repeat the above steps (1)-(6) to monitor the situation in the furnace in real time.

[0074] According to the online detection system and method for the slag composition of the top-blown furnace 1 of the present invention, the detection results are verified by fluorescence method and chemical method, meeting the error index requirements.

[0075] Example 3

[0076] The online detection method for the composition of top-blown slag in tin smelting includes the following steps:

[0077] Use an Isa furnace (top-blown furnace 1) with an inner diameter of 4×9m (inner diameter × height). The situation of sampling and detecting the tin-rich slag 13 with an operation cycle of one furnace period, and the total feed amount is 110t. It includes two stops for feeding and reduction and one slag discharge. Before the start of the furnace period, use the sampling rod 3 to measure the reserved molten pool of the top-blown furnace 1. When the molten pool height reaches 460mm, close the slag discharge port. After the slag discharge is completed, put in materials for reduction smelting according to the calculation results of the batching.

[0078] (1) When the materials accumulate to 20t, control the winch 6 to rotate through the remote control terminal 19, and lower the sampling rod 3 to a position 60cm above the cover plate 8 of the sampling hole 10 of the top-blown furnace 1, and open the cover plate 8 through the remote control terminal 19;

[0079] (2) The sampling rod 3 continues to descend, enters the stanniferous slag bath 12 in the top-blown furnace 1 through the sampling hole 10, stays for 3 seconds after the bottom end of the sampling rod 3 is inserted into the bottom of the stanniferous slag bath 12, so that the depth of the sampling rod 3 inserted into the stanniferous slag 13 layer covers the layer thickness of the stanniferous slag 13 layer, and the height of the stanniferous slag 13 wrapped on the sampling rod 3 is 600 mm;

[0080] (3) Lift the sampling rod 3. After the sampling rod 3 is pulled out of the top-blown furnace 1, quickly close the cover plate 8;

[0081] (4) Continue to lift the sampling rod 3 and turn on the smoke clearing fan 2 through the remote control terminal 19 for smoke clearing;

[0082] (5) Continue to lift the sampling rod 3 until the area stained with stanniferous slag 13 is close to the industrial probe 11. At this time, the circular limit hole 9 opened in the anti-sway limit block 4 restricts the swing of the sampling rod 3, the sampling rod 3 stops swinging, stays for 10 seconds until the stanniferous slag 13 changes from red to black, and the stanniferous slag 13 naturally cools down to 760 °C;

[0083] (6) Turn on the laser 15 through the remote control terminal 19, and at the same time slowly lift or lower the sampling rod 3. The laser beam emitted by the laser 15 irradiates the surface of the stanniferous slag 13 on the moving sampling rod 3 to generate laser plasma, forming multiple measurement points along a vertical line. The number of spectral data collected is set to 2,000. Each time, 3 point surfaces of the stanniferous slag 13 are detected, and the average value of the 3 point surfaces is taken. The first point surface is detected for 10 seconds, the sampling rod 3 is moved up or down to detect the second detection point of the rich slag for 10 seconds, and the sampling rod 3 is moved up or down to detect the third detection point of the rich slag for 10 seconds. The optical signal collected by the optical fiber probe 16 enters the spectrometer 14 through the optical fiber 18 and is converted into spectral data, and the spectrometer 14 transmits the spectral data to the remote control terminal 19.

[0084] At this time, the tin and impurity content of the rich slag is as follows: Sn: 10.54%, Fe: 30.15%, Ca: 5.09%, Si: 10.89%. Through this method, the silicate acidity K of the stanniferous slag is calculated to be 1.17. Then, 2.5 t / h of quartz stone is put in to adjust the silicate acidity of the stanniferous slag (or increase the instantaneous input amount of high-silicon materials). Since the tin content in the stanniferous slag is 10.54% and the reducing atmosphere is relatively strong, the reducing coal consumption is reduced from 2.5 t / h to 1 t / h to ensure that the heating rate matches the reduction rate.

[0085] (7) When the material accumulates to 50 t, 90 t, 110 t, stop feeding and reduce for 15 minutes for the first and second times, and repeat the above steps (1)-(6), and monitor the situation in the furnace in real time.

[0086] According to the online detection system and method for detecting the composition of the top-blown furnace slag of the present invention, the detection results are verified by fluorescence method and chemical method, and meet the error index requirements.

[0087] Table 1 below shows the comparison of the detection results of the composition of tin-rich slag by the present utility model and the spectral detection method. The cycle number represents that the operation positive cycle is one furnace period; the batch number represents that the spectrum and laser analysis are the same tin-rich slag sample.

[0088] Table 1 Example 2 Comparison of the detection results of the composition of tin-rich slag by the present utility model and the spectral detection method

[0089]

[0090]

[0091]

[0092] As can be seen from Table 1, the results of detecting tin-rich slag by the present utility model are consistent with those of the traditional spectral detection, meeting the requirements of error detection. As shown in Table 2.

[0093] Table 2 Comparison table of the deviation between the present utility model and the spectrum

[0094] Item Fe% Si% Ca% Laser analysis 23.06 9.37 2.96 Spectral analysis 23.51 8.74 3.27 Deviation -0.45 0.63 -0.32 Standard deviation index ±1.5 ±1 ±0.5

[0095] According to the detection method of the present utility model, tin-rich slag in the furnace can be dipped at any time during the smelting process, quickly and accurately. The operation situation in the furnace can be mastered at any time, so as to adjust the core smelting parameters such as material ratio, oxidation and reduction atmosphere, etc., thereby ensuring the smelting quality, improving the furnace condition stability and the degree of smelting control, effectively reducing the coal unit consumption, dust rate and increasing the direct tin recovery rate.

[0096] The following table is the comparison table of indicators before and after implementing the detection method of the present utility model (Table 3 shows the indicator situation before implementation, and Table 4 shows the indicator situation after applying the present utility model)

[0097] Table 3 Indicator situation table before implementation

[0098] Item Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Coal consumption per tonne (t / t) 0.747 0.752 0.739 0.742 0.738 0.741 Soot rate (%) 23.54 24.27 23.22 24.79 23.96 23.88

[0099] Table 4 Indicator situation table after applying the present utility model

[0100] Item Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Coal consumption per tonne (t / t) 0.729 0.716 0.701 0.695 0.692 0.688 Soot rate (%) 21.23 21.45 20.09 20.87 20.49 20.16

[0101] As can be seen from the two tables, by sampling and analyzing using the present utility model, the operation situation in the furnace can be mastered at any time, so as to adjust the core smelting parameters such as material ratio, oxidation and reduction atmosphere, etc. The technical and economic indicators of coal unit consumption and dust rate have been improved, and the effect is very obvious.

[0102] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An on-line detection system for the composition of top-blown slag in tin smelting, characterized in that, It includes a LIBS detection system and a sampling rod dipping system; the sampling rod dipping system includes a top-blown converter, a fume cleaning fan, a sampling rod, an anti-sway limit block, a steel wire rope, a winch, a fixed bracket and a cover plate; The top end of the sampling rod is connected to the winch through a steel wire rope. One end of the fixed bracket is fixedly installed with an anti-sway limit block. The anti-sway limit block is provided with a circular limit hole, and the diameter of the sampling rod is adapted to the aperture of the circular limit hole; The top of the top-blown converter is provided with a sampling hole. A cover plate is provided at the top of the sampling hole. The diameter of the sampling rod is adapted to the aperture of the sampling hole. The sampling rod moves up and down through the circular limit hole and / or the sampling hole; The fume cleaning fan is fixedly installed above the top-blown converter near the sampling hole and on one side of the sampling rod; The LIBS detection system includes an industrial probe and a spectrometer. The industrial probe is fixedly installed above the fume cleaning fan on one side of the sampling rod. A laser is installed on one side inside the industrial probe, and an optical fiber probe is installed on the other side. The inlet end of the optical fiber probe is aligned with the optical signal emitted by the laser-induced plasma, and the outlet end of the optical fiber probe is connected to the spectrometer; The length of the sampling rod is longer than the distance from the circular limit hole to the industrial probe, and the length of the sampling rod is longer than the distance from the sampling hole to the bottom of the tin-rich slag bath in the top-blown converter.

2. The online detection system for the composition of top-blown slag in tin smelting according to claim 1, wherein The optical fiber probe includes a collimating lens and an optical fiber. The collimating lens is installed on one side inside the industrial probe and is aligned with the optical signal emitted by the laser-induced plasma. One end face of the optical fiber is located at the focal point of the collimating lens, and the other end of the optical fiber is connected to the spectrometer.

3. The online detection system for the composition of top-blown slag in tin smelting according to claim 1, characterized in that, It further includes a remote control terminal. The spectrometer, the fume cleaning fan and the winch are respectively electrically connected to the remote control terminal; the cover plate is connected to the remote control terminal.

4. The on-line detection system for the composition of the top-blown slag in tin smelting according to claim 1, characterized in that, One side of the cover plate is connected to a cylinder that drives it to open or close the opening of the sampling hole. The piston of the cylinder is connected to the cover plate through a connecting piece. The control valve on the air supply pipe connected to the cylinder is connected to the remote control terminal.

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