A method for quantitatively testing the gas cluster loading on the surface of a bubble

Abstract

The application discloses a method for quantitatively testing the gas flocculus load on the surface of bubbles, belongs to the technical field of bubble load, and can solve the technical problems of measurement error and incapability of quantitative testing of the existing method for testing the mineral particle load on the surface of bubbles. The application can improve the measurement accuracy and repeatability, and make the result more reliable and accurate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of bubble loading, and particularly relates to a method for quantitatively testing the loading amount of gas floc on the surface of a bubble. BACKGROUND

[0002] In the prior art, the method for testing the loading amount of mineral particles on the surface of a bubble mainly relies on shooting a two-dimensional image of the bubble-particle collision and adhesion, and qualitatively judging the size of the loading amount by measuring the contact angle or the adhesion area (as shown in Figure 3 a). The limitation of this method is that it can only provide a qualitative judgment, and cannot perform accurate quantitative analysis. In addition, when the gas floc adheres to the bubble, due to the complexity of the three-dimensional structure, the measurement result of the two-dimensional image will introduce a large error, which may lead to a wrong conclusion. As shown in Figure 3 b, the gas floc contact angle measured by using the contact angle measurement method is smaller than Figure 3 a, but the loading amount of the bubble is exactly the opposite.

[0003] The testing method of the prior art has the following problems:

[0004] 1. Limitation of two-dimensional image: the two-dimensional image cannot accurately reflect the three-dimensional distribution and loading amount of the mineral particles on the surface of the bubble, especially when the gas floc exists, a large amount of information will be lost in the two-dimensional projection.

[0005] 2. Measurement error: due to the irregular distribution of the mineral particles on the surface of the bubble and the complex structure of the gas floc, the two-dimensional image analysis method is prone to measurement error. In addition, under the condition of high-concentration ore pulp, the background of the shot picture is chaotic and fuzzy, and the contact angle or adhesion area cannot be accurately measured by image processing.

[0006] 3. Limitation of qualitative analysis: the existing method cannot provide an accurate numerical value of the bubble loading amount, but makes a qualitative judgment based on visual (two-dimensional image) analysis, which limits its application in the optimization of the mineral flotation process. SUMMARY

[0007] The present application provides a method for quantitatively testing the loading amount of gas floc on the surface of a bubble, aiming at the problems of measurement error and inability to quantitatively test the loading amount of mineral particles on the surface of a bubble in the prior art.

[0008] The present application adopts the following technical solutions:

[0009] A method for quantitatively testing the loading amount of gas floc on the surface of a bubble, comprising the following steps:

[0010] Firstly, a glass tank is placed on a magnetic stirrer, the magnetic stirrer is placed on a lifting platform, and a support is placed on one side of the lifting platform.

[0011] Second step, add 1000mL ultrapure water in the glass tank, and place the stirring rotor at the bottom of the glass tank for subsequent operation steps;

[0012] Third step, weigh 1g of coal sample and add it to the glass tank, start the magnetic stirrer, set the speed to 900r / min, and perform dispersion operation, stop stirring after 2min;

[0013] Fourth step, fix the capillary tube at the top of the support, immerse the end of the capillary tube below the liquid level in the glass tank, connect the capillary tube top end to the micro-injection pump through a hose, and generate a single bubble by controlling the air inlet flow of the micro-injection pump, so that it adheres to the bottom of the capillary tube;

[0014] Fifth step, start the temperature control unit to raise the water temperature in the tank, based on the temperature difference effect, the air solubility of the water in the tank decreases, and then the micro-bubbles are precipitated on the surface of the coal particles;

[0015] Sixth step, start the magnetic stirrer to stir the slurry environment in the glass tank at a speed of 350r / min for 1min, and then let the slurry environment stand for 2min after stirring;

[0016] Seventh step, slowly place the sampler at the bottom of the bubble, keep the sampler fixed, adjust the lifting platform to slowly lower the glass tank, generate a displacement difference between the glass tank and the sampler, and when the bubble at the bottom of the capillary tube detaches from the water surface, the bubble breaks, the air floc adhered to the surface of the bubble falls onto the sampler, and then stop the downward movement of the lifting platform;

[0017] Eighth step, slowly transfer the sample in the sampler to the glass crucible for drying operation, and after drying, weigh the coal particles to judge the air floc loading capacity of the single bubble by the weight.

[0018] Further, the bubble size in the fourth step is 3mm.

[0019] Further, the temperature control unit in the fifth step includes a temperature sensor, a heating device, and a tank water temperature real-time feedback device, the signal output end of the temperature sensor is connected to the signal input end of the tank water temperature real-time feedback device.

[0020] Further, the sampler includes a sampling tank, and one end of the sampling tank is connected with a handle.

[0021] The beneficial effects of the present application are as follows:

[0022] 1. Quantitative testing: The prior art mainly relies on qualitative analysis of two-dimensional images, such as measuring the wrapping angle or the adhesion area to estimate the bubble load, which is easily affected by the measurement angle and analysis method, resulting in low quantitative and accurate results. In contrast, the present method is based on quantitative testing, by cutting off the adhesion gas floc on the bubble surface, drying and weighing, to directly obtain the specific value of the bubble load.

[0023] 2. Reduce error: The traditional method has a large error in measuring the bubble load, especially for micro-bubbles and particle-formed gas floc. In addition, for the actual production of the pulp concentration, the existing image shooting method cannot obtain a clear bubble image, and the measurement result error is large. The present scheme can improve the measurement accuracy and repeatability, making the results more reliable and accurate.

[0024] 3. Practicality: Each step of the present scheme is controllable and operable, and does not require complex instruments and equipment, suitable for laboratory and industrial applications. In contrast, the traditional method may require complex image processing software and high-speed cameras with microscope lenses, which is more complex and time-consuming to operate. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic diagram of the quantitative testing device of the present application;

[0026] Figure 2 is a schematic diagram of the sampler of the present application;

[0027] Figure 3 is a schematic diagram of the bubble surface mineral particle load testing results of the prior art;

[0028] Figure 4 is an image of the bubble surface load gas floc of the present application;

[0029] Wherein: 1-capillary tube; 2-bracket; 3-container; 4-bubble; 5-gas floc; 6-magnetic stirrer; 7-lifting platform; 8-micro-injection pump; 9-sampling groove; 10-grip rod; 11-micro-bubble; 12-mineral particle. DETAILED DESCRIPTION

[0030] In order to make the purpose and advantages of the present application clearer and more obvious, the present application will be further described below in conjunction with examples, it should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application.

[0031] First, combine and place the equipment used for the test, the device is as follows Figure 1The stirring rotor is placed at the bottom of the square glass tank for subsequent operation steps. A coal sample weighing 1 g is added to the glass tank, and then the magnetic stirrer is turned on at a speed of 900 r / min for dispersion operation. After 2 min, the operation is stopped.

[0032] The capillary tube is fixed on a support, with the lower end immersed below the liquid level. The other end of the capillary tube is connected to a micro-injection pump through a hose. By controlling the air flow of the micro-injection pump, a single bubble is generated and adheres to the bottom of the capillary tube. The size of the generated bubble is about 3 mm;

[0033] Then, the temperature control unit (composed of a temperature sensor, heating equipment, and real-time feedback device for water temperature in the tank) is turned on. This unit can simultaneously achieve processes such as temperature heating, quantitative temperature holding, and real-time temperature feedback monitoring. By operating the temperature control unit, the water temperature in the tank is raised to a certain temperature. At this time, based on the temperature difference effect, the air solubility of the water in the tank is reduced, and then the micro-bubbles are precipitated on the surface of the coal particles;

[0034] After the above operations are completed, the magnetic stirrer is turned on at a speed of 350 r / min to stir the slurry environment for 1 min. After stirring, the slurry environment is allowed to stand for 2 min. At this time, the sampler is slowly placed at the bottom of the large bubble, and the sampler is kept fixed. Then, the movable lifting platform at the bottom of the glass tank is adjusted 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 detaches from the water surface, the bubble breaks. At this time, the air floc adhering to the surface of the bubble falls onto the sampler. At this time, the downward movement of the lifting platform is stopped. The sample in the sampler is slowly transferred to the glass crucible for drying operation. After drying, the coal particles are weighed to evaluate the air floc loading capacity of the single bubble.

[0035] Example 1

[0036] In the mineral flotation process, bubbles are the key carriers for carrying mineral particles to float. Testing the bubble surface mineral particle loading can directly understand the attachment of mineral particles and bubbles in the flotation process. By comparing the mineral particle loading under different flotation conditions, the flotation efficiency can be evaluated. Accurate knowledge of the bubble surface mineral particle loading helps to optimize various parameters of the flotation process. By studying the relationship between the loading and different parameters, such as finding that the bubble surface mineral particle loading changes regularly with the change of the stirring speed of the slurry, the optimal stirring speed can be determined to ensure that the mineral particles can fully contact and adhere to the bubbles, while avoiding the detachment of the adhered mineral particles or bubble coalescence due to excessive stirring speed.

[0037] The present application quantitatively measures the gas bubble surface gas flocculation load, and the specific operation mode is as follows:

[0038] A transparent glass tank is placed on a magnetic stirrer, the magnetic stirrer is placed on a lifting platform, and a support is placed on one side of the lifting platform. Then 1000 mL of ultrapure water is added to the glass tank, and the stirring rotor is placed at the bottom of the glass tank for subsequent operation steps. 1g of coal sample is weighed and added to the glass tank, the magnetic stirrer is turned on, and the speed is set to 900r / min for dispersion operation, and the stirring is stopped after 2min. A capillary tube is fixed at the top of the support, the end of the capillary tube is immersed below the liquid level in the glass tank, and the top of the capillary tube is connected to a micro-injection pump through a hose. By controlling the air inlet flow of the micro-injection pump, a single air bubble is generated and adhered to the bottom of the capillary tube. Then the temperature control unit is turned on to raise the water temperature in the tank, and based on the temperature difference effect, the air solubility of the water in the tank decreases, and then the micro-bubbles are precipitated on the surface of the coal particles.

[0039] After the above operation is completed, the magnetic stirrer is turned on and the slurry environment is stirred at a speed of 350r / min for 1min, and after the stirring is completed, the slurry environment is allowed to stand for 2min. Slowly place the sampler at the bottom of the bubble, keep the sampler fixed, adjust the lifting platform to slowly lower the glass tank, and generate a displacement difference between the glass tank and the sampler. After the bubble at the bottom of the capillary tube detaches from the water surface, the bubble breaks and the gas flocculation adhered to the surface of the bubble falls onto the sampler. At this time, stop the lowering operation of the lifting platform; slowly transfer the sample in the sampler to the glass crucible for drying operation; after drying, weigh the coal particles, and judge the gas bubble flocculation load of a single bubble by the weight.

[0040] As shown in Figure 4 At a speed of 350r / min, the gas bubble flocculation load of a single bubble is 3.22mg after drying. The quantitative measurement can directly obtain the specific value of the bubble load, and the traditional method has a large error in measuring the bubble load. The present application can improve the measurement accuracy and repeatability, 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 by: The steps include: The first step is to place the glass tank on the magnetic stirrer, which is then placed on a lifting platform with a bracket on one side. In the second step, 1000 mL of ultrapure water was added to the glass tank and a stirring rotor was placed at the bottom of the glass tank for subsequent operation. In the third step, 1 g of coal sample was weighed and added to the glass tank. The magnetic stirrer was turned on and the speed was set to 900 r / min for dispersion operation. The stirring was stopped after 2 minutes. The fourth step is to fix the capillary tube at the top of the bracket, with the end of the capillary tube immersed below the liquid level in the glass tank. The top of the capillary tube 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 tube. The fifth step is to turn on the temperature control unit to increase the water temperature in the tank. Due to the temperature difference effect, the air solubility of the water in the tank decreases, 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 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 will be 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 flocculent load of a single bubble is judged by the weighed weight.

2. The 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. The method for quantitatively testing the amount of gas flocs on the surface of bubbles according to claim 1, wherein: 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. The method for quantitatively testing the amount of gas flocs on the surface of bubbles according to claim 1, wherein: The sampler in the seventh step includes a sampling slot, one end of which is connected to a gripping rod.

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