Method for quantitatively testing loading capacity of air floc on surface of bubble

Abstract

The invention discloses a method for quantitatively testing the loading capacity of air floccules on the surface of a bubble, belongs to the technical field of bubble loading, and can solve the technical problems that an existing method for testing the loading capacity of mineral particles on the surface of the bubble has measurement errors, quantitative testing cannot be achieved and the like. The specific numerical value of the bubble loading capacity is directly obtained by cutting out the adhered air floccules on the surfaces of the bubbles, drying and weighing the adhered air floccules. According to the invention, the precision and repeatability of measurement can be improved, so that the result is more reliable and accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of bubble loading, and in particular relates to a method for quantitatively testing the loading amount of gas flocs on the surface of bubbles. Background Art

[0002] In the prior art, the method for testing the mineral particle loading on the bubble surface mainly relies on taking two-dimensional images of bubble-particle collision and adhesion, and qualitatively judging the loading amount by measuring the wrapping angle or adhesion area ( Figure 3 The limitation of this method is that it can only provide qualitative judgments, but cannot perform accurate quantitative analysis. In addition, when the gas flocs adhere to the bubbles, due to the complexity of the three-dimensional structure, the measurement results of the two-dimensional image will introduce large errors, which may lead to erroneous conclusions. Figure 3 As shown in b, the air flocculent enveloping angle obtained by the enveloping angle measurement method is less than Figure 3 The wrap angle measured in a, but the bubble loading is exactly the opposite.

[0003] The testing method of the prior art has the following problems: 1. Limitations of two-dimensional images: Two-dimensional images cannot accurately reflect the three-dimensional distribution and loading of mineral particles on the bubble surface. Especially when gas flocs exist, the two-dimensional projection will lose a lot of information.

[0004] 2. Measurement error: Due to the irregular distribution of mineral particles on the bubble surface and the complex structure of gas flocs, the two-dimensional image analysis method is prone to measurement errors. In addition, under the condition of high-concentration slurry, the background of the captured image is chaotic and blurred, and image processing cannot accurately measure the coverage angle or adhesion area.

[0005] 3. Limitations of qualitative analysis: Existing methods cannot provide accurate values ​​for bubble loading, but instead make qualitative judgments based on visual (two-dimensional image) analysis, which limits their application in the optimization of mineral flotation processes. Summary of the invention

[0006] In view of the problems in the prior art that the method for testing the mineral particle loading amount on the bubble surface has measurement errors and cannot be quantitatively tested, the present invention provides a method for quantitatively testing the gas floc loading amount on the bubble surface.

[0007] The present invention adopts the following technical solution: A method for quantitatively testing the amount of gas flocs on the surface of bubbles, comprising the following steps: The first step is to place the glass tank on the magnetic stirrer, and the magnetic stirrer is placed on a lifting platform, and a bracket is placed on one side of the lifting platform; The second step is to add 1000 mL of ultrapure water into the glass tank and place the stirring rotor at the bottom of the glass tank for subsequent operation. The third step is to weigh 1 g of coal sample and add it into the glass tank, turn on the magnetic stirrer, set the speed to 900 r / min, perform the dispersion operation, and stop stirring after 2 minutes; The fourth step is to fix the capillary at the top of the bracket, the end of the capillary is immersed below the liquid level in the glass tank, the top of the capillary is connected to the micro-injection pump through a hose, and a single bubble is generated by controlling the air intake flow of the micro-injection pump, so that it adheres to the bottom of the capillary; The fifth step is to turn on the temperature control unit to increase the water temperature in the tank. Based on the temperature difference effect, the air solubility of the water in the tank is reduced, and then microbubbles are precipitated on the surface of the coal particles; Step 6: Turn on the magnetic stirrer and stir the slurry environment in the glass tank at a speed of 350 r / min for 1 min. After the stirring, let the slurry environment stand for 2 min. Step 7: slowly place the sampler at the bottom of the bubble, keep the sampler fixed, adjust the lifting platform, and slowly lower the glass tank. There is a displacement difference between the glass tank and the sampler. When the bubble at the bottom of the capillary tube is separated from the water surface, the bubble will burst, and the gas flocs attached to the bubble surface will fall onto the sampler. At this time, stop the lifting platform from moving downward. In the eighth step, the sample in the sampler is slowly transferred to a glass crucible for drying; after drying, the coal particles are weighed, and the gas floc loading of a single bubble is judged by the weighed weight.

[0008] Furthermore, the bubble size in the fourth step is 3 mm.

[0009] Furthermore, the temperature control unit in the fifth step includes a temperature sensor, a heating device and a real-time feedback device for the tank water temperature, and the signal output end of the temperature sensor is connected to the signal input end of the real-time feedback device for the tank water temperature.

[0010] Furthermore, the sampler comprises a sampling slot, one end of which is connected to a gripping rod.

[0011] The beneficial effects of the present invention are as follows: 1. Quantitative testing: Existing technologies mainly rely on qualitative analysis of two-dimensional images, such as measuring the wrapping angle or adhesion area to estimate the bubble load. This method is easily affected by the measurement angle and analysis method, resulting in low quantitative and accurate results. In contrast, this method is based on quantitative testing, by cutting out the adherent gas flocs on the bubble surface, drying and weighing them, and directly obtaining the specific value of the bubble load.

[0012] 2. Reduce errors: Traditional methods have large errors when measuring bubble load, especially for microbubbles and particles that form gas flocs. In addition, for the slurry concentration in actual production, the existing image capture method cannot obtain a clear bubble image, and the measurement result has a large error. This solution can improve the accuracy and repeatability of the measurement, making the results more reliable and accurate.

[0013] 3. Practicality: Each step of this scheme is controllable and operable, and does not require complex instruments and equipment, making it suitable for laboratory and industrial applications. In contrast, traditional methods may require complex image processing software and equipment such as high-speed cameras with microscope lenses, which are more complicated and time-consuming to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the quantitative testing device of the present invention; Figure 2 It is a schematic diagram of the structure of the sampler of the present invention; Figure 3 This is a schematic diagram of the test results of mineral particle loading on the bubble surface in the prior art; Figure 4 This is an image of air flocs loaded on the surface of bubbles in an embodiment of the present invention; Among them: 1-capillary; 2-bracket; 3-container; 4-bubble; 5-gas floccules; 6-magnetic stirrer; 7-lifting platform; 8-micro injection pump; 9-sampling slot; 10-grip; 11-microbubble; 12-mineral particles. DETAILED DESCRIPTION

[0015] In order to make the purpose and advantages of the present invention more clear, the present invention is further described below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] First, assemble and place the equipment used in the test. Figure 1 As shown. Add 1000 mL of ultrapure water to the square glass tank, and place the stirring rotor at the bottom of the glass tank for subsequent operation. Weigh 1 g of coal sample and add it to the glass tank. Then turn on the magnetic stirrer and set the speed to 900 r / min for dispersion operation. Stop the operation after 2 min.

[0017] The capillary is fixed on the bracket, and the lower end is immersed below the liquid surface. The other end of the capillary is connected to the microinjection pump through a hose. By controlling the air flow rate of the microinjection pump, a single bubble is generated and adhered to the bottom of the capillary. The size of the generated bubble is about 3 mm; Then, the temperature control unit is turned on (the temperature control unit consists of a temperature sensor, a heating device, and a real-time feedback device for the water temperature of the tank body). The unit can simultaneously realize the processes of heating, quantitative heat preservation, and real-time feedback monitoring of temperature. The water temperature in the tank body is raised to a certain temperature by manipulating the temperature control unit. At this time, the air solubility of the water in the tank body is reduced based on the temperature difference effect, thereby causing microbubbles to precipitate on the surface of the coal particles. After the above steps are completed, turn on the magnetic stirrer and stir the slurry environment at a speed of 350 r / min for 1 minute. After stirring, let the slurry environment stand for 2 minutes. At this time, slowly place the sampler at the bottom of the large bubble and keep the sampler fixed. Then adjust the movable lifting platform at the bottom of the glass tank to slowly lower the glass tank. At this time, a displacement difference is generated between the glass tank and the sampler. After the bubble at the bottom of the capillary tube is separated from the water surface, the bubble will break. At this time, the gas flocs attached to the surface of the bubble fall onto the sampler, and the lifting platform is stopped from moving downward. The sample in the sampler is slowly transferred to a glass crucible for drying and drying; after drying, the coal particles are weighed, and the gas floc load of a single bubble is judged by the weighed weight.

[0018] Example 1 In the mineral flotation process, bubbles are the key carriers that carry mineral particles to float. Testing the mineral particle loading on the bubble surface can intuitively understand the attachment of mineral particles to bubbles during the flotation process. By comparing the mineral particle loading under different flotation conditions, the flotation efficiency can be evaluated. Accurately knowing the mineral particle loading on the bubble surface helps to optimize the various parameters of the flotation process. By studying the relationship between the loading and different parameters, if it is found that the mineral particle loading on the bubble surface shows a certain regular change with the change of the slurry stirring speed, the optimal stirring speed can be determined to ensure that the mineral particles can fully contact and attach to the bubbles, while avoiding unfavorable situations such as the detachment of attached mineral particles or the merger of bubbles due to excessive stirring speed.

[0019] The present invention quantitatively measures the amount of gas flocs on the bubble surface, and the specific operation method is as follows: Place a transparent glass tank on a magnetic stirrer, place the magnetic stirrer on a lifting platform, and place a bracket on one side of the lifting platform. Then add 1000mL of ultrapure water to the glass tank, and place the stirring rotor at the bottom of the glass tank for subsequent operation. Weigh 1g of coal sample and add it to the glass tank, turn on the magnetic stirrer, set the speed to 900r / min, perform the dispersion operation, and stop stirring after 2 minutes. Fix the capillary at the top of the bracket, and the end of the capillary is immersed below the liquid level in the glass tank. The top of the capillary is connected to the micro-injection pump through a hose. By controlling the air intake flow of the micro-injection pump, a single bubble is generated and adhered to the bottom of the capillary. Then turn on the temperature control unit to increase the water temperature in the tank body. Based on the temperature difference effect, the air solubility of the water in the tank body is reduced, and then microbubbles are precipitated on the surface of the coal particles.

[0020] After the above operations are completed, turn on the magnetic stirrer and stir the slurry environment at a speed of 350r / min for 1min. After the stirring, let the slurry environment stand for 2min. Slowly place the sampler at the bottom of the bubble, keep the sampler fixed, adjust the lifting platform, and slowly lower the glass tank. There is a displacement difference between the glass tank and the sampler. When the bubble at the bottom of the capillary tube is separated from the water surface, the bubble will break, and the gas flocs attached to the bubble surface will fall onto the sampler. At this time, stop the lifting platform from moving downward; slowly transfer the sample in the sampler to the glass crucible for drying; after drying, weigh the coal particles, and judge the gas floc load of a single bubble by the weighed weight.

[0021] like Figure 4 As shown in the figure, at a speed of 350r / min, after drying, the gas flocculent load of a single bubble was weighed to be 3.22mg when there were microbubbles. The specific value of the bubble load can be directly obtained through quantitative measurement. The traditional method has a large error in measuring the bubble load. This scheme can improve the accuracy and repeatability of the measurement, making the results more reliable and accurate.

Claims

1. A method for quantitatively testing the amount of gas flocs on the surface of bubbles, characterized in that: The steps include: The first step is to place the glass tank on the magnetic stirrer, and the magnetic stirrer is placed on a lifting platform, and a bracket is placed on one side of the lifting platform; The second step is to add 1000 mL of ultrapure water into the glass tank and place the stirring rotor at the bottom of the glass tank for subsequent operation. The third step is to weigh 1 g of coal sample and add it into the glass tank, turn on the magnetic stirrer, set the speed to 900 r / min, perform the dispersion operation, and stop stirring after 2 minutes; The fourth step is to fix the capillary at the top of the bracket, the end of the capillary is immersed below the liquid level in the glass tank, the top of the capillary is connected to the micro-injection pump through a hose, and a single bubble is generated by controlling the air intake flow of the micro-injection pump, so that it adheres to the bottom of the capillary; The fifth step is to turn on the temperature control unit to increase the water temperature in the tank. Based on the temperature difference effect, the air solubility of the water in the tank is reduced, and then microbubbles are precipitated on the surface of the coal particles; Step 6: Turn on the magnetic stirrer and stir the slurry environment in the glass tank at a speed of 350 r / min for 1 min. After the stirring, let the slurry environment stand for 2 min. Step 7: slowly place the sampler at the bottom of the bubble, keep the sampler fixed, adjust the lifting platform, and slowly lower the glass tank. There is a displacement difference between the glass tank and the sampler. When the bubble at the bottom of the capillary tube is separated from the water surface, the bubble will burst, and the gas flocs attached to the bubble surface will fall onto the sampler. At this time, stop the lifting platform from moving downward. In the eighth step, the sample in the sampler is slowly transferred to a glass crucible for drying; after drying, the coal particles are weighed, and the gas floc loading of a single bubble is judged by the weighed weight.

2. A method for quantitatively testing the amount of gas flocs on the surface of bubbles according to claim 1, characterized in that: The bubble size in the fourth step is 3 mm.

3. A method for quantitatively testing the amount of gas flocs on the surface of bubbles according to claim 1, characterized in that: The temperature control unit in the fifth step includes a temperature sensor, a heating device and a real-time feedback device for the tank water temperature. The signal output end of the temperature sensor is connected to the signal input end of the real-time feedback device for the tank water temperature.

4. A method for quantitatively testing the amount of gas flocs on the surface of bubbles according to claim 1, characterized in that: The sampler described in the seventh step includes a sampling slot, and one end of the sampling slot is connected to a grip rod.

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