An on-line device for detecting ash content of floatation tailing slurry

Abstract

The utility model relates to tailing pulp ash content detection technical field, the utility model provides a kind of for flotation tailing pulp ash content on-line detection device, including the bypass sampling tube, degassing steady flow tank and measuring chamber connected in sequence, and detection component, bypass sampling tube is used to connect with tailing main pipe, and carries out on-line sampling, degassing steady flow tank top has the vent for discharging gas in pulp sample, and two groups of steady flow plates are arranged in the inside two side walls of degassing steady flow tank, and two groups of steady flow plates are staggered arrangement, measuring chamber side wall is provided with transparent window, and detection component is located outside transparent window, for detecting the pulp sample in measuring chamber. Bubble in pulp sample can be eliminated by vent, and steady flow plate can weaken the pulsation of incoming flow, so that the flow rate of pulp is more stable. Through the above technical scheme, the technical problems of bubble shielding, liquid level fluctuation and other interference of pulp in the closed pipeline in the related art are solved.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of tailings slurry ash content detection technology, specifically, to an online ash content detection device for flotation tailings slurry. Background Technology

[0002] In the comprehensive utilization and development of coal resources, coal preparation technology is a key link in improving coal quality and achieving efficient resource utilization. Among them, the ash content of flotation tailings is an important parameter for evaluating the stability of the coal preparation production process and product quality. Its detection plays a vital role in optimizing coal preparation technology, ensuring product quality, improving production efficiency, and reducing production costs.

[0003] Traditional online ash content detection methods for flotation tailings mainly employ X-ray or gamma neutron technologies. These methods have been practically applied in engineering scenarios involving constant thickness detection of materials on conveyor belts, or in off-line / online measurement of samples after "sampling-shaping-flattening" processes. The principle is to utilize the interaction between X-rays or gamma neutrons and matter, analyzing the composition and ash content of the material by detecting signal changes after the interaction.

[0004] In recent years, laser-induced breakdown spectroscopy (LIBS) has been introduced into the field of compositional analysis of coal and mineral materials due to its ability to rapidly analyze multi-element components. This technique uses laser pulses to generate plasma on the sample surface and analyzes the plasma emission spectrum to determine the elemental composition of the sample.

[0005] However, most current applications are designed for testing dry samples or samples under open liquid surface conditions. When LIBS technology is applied to slurries in closed pipelines, factors such as air bubbles blocking light and surface fluctuations can affect the quality of the detection signal, reducing the signal-to-noise ratio and decreasing the repeatability of the measurement results. Consequently, it becomes impossible to accurately detect the ash content of flotation tailings slurry.

[0006] Therefore, developing an online detection device that can be applied to the working conditions of flotation tailings slurry, overcome interference such as bubble blockage and liquid surface fluctuation, and realize the detection of ash content in flotation tailings slurry has become an important problem that the coal preparation industry urgently needs to solve. Utility Model Content

[0007] To overcome the above-mentioned defects, embodiments of this utility model provide an online ash content detection device for flotation tailings slurry, which solves the technical problems of interference such as bubble blockage and liquid surface fluctuation in the slurry in the closed pipeline in related technologies.

[0008] According to one aspect, at least one embodiment of the present invention provides an online ash content detection device for flotation tailings slurry, comprising a bypass sampling pipe, a degassing and stabilizing tank, and a measuring chamber connected in sequence, as well as a detection component. The bypass sampling pipe is used to connect to the tailings main pipe for online sampling. The top of the degassing and stabilizing tank has an exhaust port for discharging gas from the slurry sample. Each of the two inner side walls of the degassing and stabilizing tank is provided with a set of stabilizing plates, and the two sets of stabilizing plates are arranged alternately. The side wall of the measuring chamber is provided with a transparent window, and the detection component is located outside the transparent window for detecting the slurry sample in the measuring chamber.

[0009] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: The inner wall of the degassing and stabilizing tank is provided with a buffer plate, which is located on the side away from the bypass sampling tube, and is used to buffer the impact force when the slurry sample enters the degassing and stabilizing tank.

[0010] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: A gap is provided in the measuring chamber, and a thin sample layer for detection by the detection component can be formed between the gap and the side wall of the measuring chamber where the transparent window is provided.

[0011] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: The bottom of the measuring chamber has a drain outlet, which is used to connect to the tailings main pipe for slag discharge and return.

[0012] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: The detection component is a LIBS spectral probe assembly, which is connected to the spectrometer via optical fiber and is capable of emitting a light beam toward the thin sample layer and capturing the generated plasma signal.

[0013] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: A first annular air knife is provided outside the transparent window. The first annular air knife is used to blow air onto the outer surface of the transparent window to form an air curtain that can prevent pollution on the outer surface of the transparent window.

[0014] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: The LIBS spectral probe assembly has a second annular air knife on the outer periphery of the probe. The second annular air knife is used to blow air onto the outer surface of the probe to form an air curtain that prevents contamination. Both the first and second annular air knives are connected to the air supply unit.

[0015] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: The distance between the probe of the LIBS spectral probe assembly and the transparent window is 3-20 mm.

[0016] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: A valve is installed on the bypass sampling tube.

[0017] For example, in at least one embodiment of this utility model, an online ash content detection device for flotation tailings slurry further includes: The bypass sampling tube, the degassing and stabilizing tank, the measuring chamber, and the detection components are all housed within an explosion-proof enclosure.

[0018] The beneficial effects of the embodiments of this utility model are as follows: In this invention, a bypass sampling pipe is connected to the tailings main pipe, allowing the flotation tailings slurry to be drawn to a deaeration and stabilization tank without affecting the normal operation of the main process. After entering the deaeration and stabilization tank, the slurry sample first impacts a buffer plate, which disperses the impact force, allowing the slurry to flow downwards relatively smoothly. During this downward flow, air bubbles in the slurry gradually rise and are discharged through the top vent. The staggered arrangement of the stabilization plates creates a tortuous flow channel within the tank, effectively reducing the pulsation of the incoming flow and making the slurry flow velocity more stable. After deaeration and stabilization, air bubbles in the slurry are removed, and the flow pattern is stabilized, providing excellent sample conditions for subsequent accurate detection.

[0019] Preferably, the detection component in this solution employs a LIBS spectral probe assembly, based on laser-induced breakdown spectroscopy technology. It generates plasma on the surface of the slurry sample by emitting laser pulses. Plasma of different elements emits spectra with specific wavelengths. The spectral acquisition unit collects these spectral signals and transmits them to the spectrometer. Based on the spectral characteristics, the types and contents of elements in the sample are identified, and the ash content of the flotation tailings slurry is calculated. The transparent window ensures that the laser can successfully irradiate the sample, while also facilitating the acquisition of spectral signals and preventing interference from the external environment. An explosion-proof enclosure encapsulates the entire detection device, preventing the high temperatures and other hazards generated during operation from contacting external flammable and explosive gases, ensuring the safe operation of the device. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of an online ash content detection device for flotation tailings slurry in one embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the degassing and flow stabilizing tank in the embodiment; Figure 3 for Figure 1 A schematic diagram of the measuring chamber in the embodiment; Figure 4 for Figure 1 A schematic diagram of the structure of the second annular air knife in the embodiment.

[0022] In the diagram: 1. Bypass sampling tube, 2. Degassing and stabilizing tank, 3. Measuring chamber, 4. Detection component, 201. Exhaust port, 5. Flow stabilizing plate, 6. Transparent window, 7. Buffer plate, 8. Spacer, 301. Drain port, 9. First annular air knife, 10. Second annular air knife, 11. Explosion-proof housing. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0024] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0025] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] like Figures 1-4 The diagram illustrates an online ash content detection device for flotation tailings slurry according to an embodiment of the present invention. It includes a bypass sampling pipe 1, a degassing and stabilizing tank 2, and a measuring chamber 3 connected in sequence, as well as a detection component 4. The bypass sampling pipe 1 is connected to the main tailings pipe to enable online sampling of the flotation tailings slurry. A valve is installed on the bypass sampling pipe 1 to facilitate control of the sample collection flow rate and time.

[0030] The degassing and stabilizing tank 2 is used to remove air bubbles from the slurry sample and stabilize its flow state. An exhaust port 201 is provided at the top of the degassing and stabilizing tank 2. A set of flow stabilizing plates 5 are installed on each of the two inner side walls of the degassing and stabilizing tank 2. The two sets of flow stabilizing plates 5 are arranged alternately, forming a tortuous flow channel. A buffer plate 7 is installed on the inner wall of the degassing and stabilizing tank 2 on the side away from the bypass sampling pipe 1.

[0031] The measuring chamber 3 is connected to the degassing and stabilizing tank 2 and is used to contain the slurry sample after degassing and stabilization treatment. A transparent window 6 is provided on the side wall of the measuring chamber 3. The detection component 4 is located outside the transparent window 6 and is used to detect the slurry sample in the measuring chamber 3 and finally calculate the ash content of the flotation tailings slurry. The bypass sampling pipe 1, the degassing and stabilizing tank 2, the measuring chamber 3, and the detection component 4 are all housed in the explosion-proof enclosure 11.

[0032] Working Principle: The bypass sampling pipe 1 is connected to the tailings main pipe, leading the flotation tailings slurry to the deaeration and stabilization tank 2 without affecting the normal operation of the main process. After entering the deaeration and stabilization tank 2, the slurry sample first impacts the buffer plate 7, which disperses the impact force, allowing the slurry to flow downwards relatively smoothly. During the downward flow, air bubbles in the slurry gradually rise and are discharged through the top vent 201. The staggered arrangement of the stabilization plates 5 creates a tortuous flow channel within the tank, effectively reducing the pulsation of the incoming flow and making the slurry flow velocity more stable. After deaeration and stabilization treatment, air bubbles in the slurry are removed, and the flow pattern is stabilized, providing excellent sample conditions for subsequent accurate detection.

[0033] Preferably, the detection component 4 in this solution employs a LIBS spectral probe assembly, which is based on laser-induced breakdown spectroscopy technology. It generates plasma on the surface of the slurry sample by emitting laser pulses. The LIBS spectral probe assembly is connected to the spectrometer via optical fiber. Plasma of different elements emits spectra with specific wavelengths. The spectral acquisition unit collects these spectral signals and transmits them to the spectrometer. Based on the spectral characteristics, the element types and contents in the sample are identified, and the ash content of the flotation tailings slurry is calculated. The transparent window 6 ensures that the laser can successfully irradiate the sample, while also facilitating the acquisition of spectral signals without interference from the external environment. The explosion-proof housing 11 encapsulates the entire detection device, preventing the high temperatures and other hazardous factors generated during operation from contacting external flammable and explosive gases, ensuring the safe operation of the device.

[0034] The degassing and stabilization tank 2 degasses and stabilizes the slurry sample, reducing the impact of air bubble obstruction and liquid surface fluctuations on the detection signal. The air-removed slurry allows the laser to more accurately irradiate the sample, and the stable flow pattern ensures the consistency of the sample state during each detection, thereby improving the quality of the detection signal, enhancing the signal-to-noise ratio, and enabling accurate detection of the ash content of flotation tailings slurry. The bypass sampling tube 1 allows the device to perform online sampling without affecting the main tailings process, acquiring flotation tailings slurry samples in real time without requiring additional sampling and pretreatment.

[0035] In some examples, such as Figure 1 , 3As shown, the spacer 8 is installed inside the measuring chamber 3. There is a gap between the bottom end of the spacer 8 and the bottom wall of the measuring chamber 3, and a gap between the spacer 8 and the side wall where the transparent window 6 is located. A thin sample layer can be formed here for detection by the detection component 4. A drain outlet 301 is provided at the bottom of the measuring chamber 3. A valve is installed at the drain outlet 301. The drain outlet 301 is used to connect to the tailings main pipe to realize the slag discharge and return function.

[0036] Working principle: The spacer 8 allows the slurry to form a uniform thin sample layer between the spacer 8 and the sidewall of the transparent window 6 within the measuring chamber 3. Due to the thin sample layer, the stability of the slurry is further improved, reducing the impact of slurry flow variations on the detection. In laser-induced breakdown spectroscopy (LIBS) detection, the thinner sample layer allows the laser energy to be more concentrated on the sample, generating a more stable and repeatable plasma signal, thereby improving the accuracy of the detection.

[0037] The drain outlet 301 at the bottom of the measuring chamber 3 is controlled by a valve and is opened periodically or intermittently depending on the actual situation. When the valve is opened, the slurry in the measuring chamber 3 flows back to the tailings main pipe through the drain outlet 301 and re-enters the main process for treatment, realizing the overall flow path circulation of the detection device.

[0038] In some examples, such as Figure 3 , 4 As shown, the first annular air knife 9 is positioned outside the transparent window 6, with multiple nozzles arranged circumferentially to allow gas to be blown onto the outer surface of the transparent window 6. The first annular air knife 9 is connected to the gas supply unit via a pipe. The second annular air knife 10 is positioned around the probe of the LIBS spectral probe assembly, and has the same structure as the first annular air knife 9. The second annular air knife 10 is also connected to the gas supply unit via a pipe. The distance between the probe of the LIBS spectral probe assembly and the transparent window 6 is controlled between 3 and 20 millimeters.

[0039] Working principle: The first annular air knife 9 blows air onto the outer surface of the transparent window 6, forming a continuous air curtain on the outer surface of the transparent window 6. This air curtain can block dust, impurities, and other tiny particles from the surrounding environment, preventing them from adhering to the surface of the transparent window 6 and thus preventing contamination. Similarly, the second annular air knife 10 blows air onto the outer surface of the probe, forming an air curtain on the outer surface of the probe to prevent contamination of the probe end face.

[0040] By controlling the distance between the LIBS spectral probe assembly and the transparent window 6 within a relatively short range of 3-20 mm, the laser can be more effectively focused onto the thin sample layer within the measurement chamber 3, generating a more stable plasma signal. Simultaneously, the shorter distance helps reduce the impact of bubbles and liquid surface fluctuations on the measurement, thereby improving the repeatability of the plasma signal and the accuracy of the detection results.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An online ash content detection device for flotation tailings slurry, characterized in that, The device includes a bypass sampling tube (1), a degassing and stabilizing tank (2), and a measuring chamber (3) connected in sequence, as well as a detection component (4). The bypass sampling tube (1) is used to connect to the tailings main pipe and perform online sampling. The top of the degassing and stabilizing tank (2) has an exhaust port (201) for discharging gas from the slurry sample. Each of the two inner side walls of the degassing and stabilizing tank (2) is provided with a set of stabilizing plates (5), and the two sets of stabilizing plates (5) are arranged alternately. The side wall of the measuring chamber (3) is provided with a transparent window (6), and the detection component (4) is located outside the transparent window (6) for detecting the slurry sample in the measuring chamber (3).

2. The online ash content detection device for flotation tailings slurry according to claim 1, characterized in that, The inner wall of the degassing and stabilizing tank (2) is provided with a buffer plate (7). The buffer plate (7) is located on the side away from the bypass sampling tube (1) and is used to buffer the impact force when the slurry sample enters the degassing and stabilizing tank (2).

3. The online ash content detection device for flotation tailings slurry according to claim 1, characterized in that, The measuring chamber (3) is provided with a spacer (8), and a thin sample layer for detection by the detection component (4) can be formed between the spacer (8) and the side wall of the measuring chamber (3) where the transparent window (6) is provided.

4. The online ash content detection device for flotation tailings slurry according to claim 3, characterized in that, The measuring chamber (3) has a drain outlet (301) at the bottom, which is used to connect to the tailings main pipe for slag discharge and return.

5. The online ash content detection device for flotation tailings slurry according to claim 3, characterized in that, The detection component (4) is a LIBS spectral probe assembly. The LIBS spectral probe assembly is connected to the spectrometer via optical fiber and can emit a light beam to the sample thin layer and capture the generated plasma signal.

6. The online ash content detection device for flotation tailings slurry according to claim 5, characterized in that, A first annular air knife (9) is provided outside the transparent window (6). The first annular air knife (9) is used to blow air onto the outer surface of the transparent window (6) to form an air curtain that can prevent pollution on the outer surface of the transparent window (6).

7. The online ash content detection device for flotation tailings slurry according to claim 6, characterized in that, The LIBS spectral probe assembly has a second annular air knife (10) on the outer periphery of the probe. The second annular air knife (10) is used to blow air onto the outer surface of the probe to form an air curtain that can prevent contamination on the outer surface of the probe. Both the first annular air knife (9) and the second annular air knife (10) are connected to the air supply unit.

8. The online ash content detection device for flotation tailings slurry according to claim 7, characterized in that, The distance between the probe of the LIBS spectral probe assembly and the transparent window (6) is 3-20 mm.

9. The online ash content detection device for flotation tailings slurry according to claim 1, characterized in that, A valve is installed on the bypass sampling tube (1).

10. The online ash content detection device for flotation tailings slurry according to claim 1, characterized in that, The bypass sampling tube (1), the degassing and stabilizing tank (2), the measuring chamber (3) and the detection component (4) are all housed inside the explosion-proof enclosure (11).

Images