A combined detection device for pulp level and froth yield of a flotation machine

Abstract

This invention relates to the field of mining automation equipment technology, and in particular to a combined detection device for slurry level and froth production in a flotation machine. The device includes an isolation tank, a level measuring instrument, and a froth production measuring instrument. The level measuring instrument is located at the top of the isolation tank, and the froth production measuring instrument is located on one side of the isolation tank. The isolation tank is located inside the flotation cell, and the froth production measuring instrument is positioned opposite the froth cell. By using the level measuring instrument and the froth production measuring instrument, combined detection of slurry level and froth production in the flotation machine is achieved. For interlocking control, the froth production can be set within a fixed range. When the froth value detected by the froth production measuring instrument exceeds this range, automatic adjustment is performed by regulating the slurry level in the flotation machine, thereby achieving stable control of the froth production and effectively ensuring the flotation recovery rate.

Description

Technical Field

[0001] This invention relates to the field of mining automation equipment technology, and in particular to a combined detection device for slurry level and foam production in a flotation machine. Background Technology

[0002] Flotation machines are important equipment used in mineral flotation and are widely used in mining, resource recycling, and other fields. When the flotation equipment is running, the slurry and flotation reagents are stirred and aerated. The target minerals collide with the bubbles, adhere to them, and detach from them, forming mineralized bubbles. These mineralized bubbles rise to the top of the flotation machine to form a foam layer, which is then scraped off or overflowed, thus achieving product separation.

[0003] For flotation machines, a stable slurry level in the tank is a crucial prerequisite for the normal operation of the equipment and the process flow. It also effectively reduces safety hazards and, more importantly, directly impacts production performance. The slurry level is directly related to concentrate grade and recovery rate in mineral processing.

[0004] The higher the liquid level, the lower the grade of the foam concentrate, and the higher the beneficiation recovery rate; conversely, the lower the liquid level, the higher the concentrate grade, and the lower the beneficiation recovery rate. Foam production is a key characteristic value for evaluating concentrate production. Under the premise of ensuring the concentrate grade meets the requirements, maximizing foam production can significantly increase concentrate production and has important guiding significance for production indicators.

[0005] The current flotation machine level detection device mainly consists of five parts: a level measuring bracket, a laser sensor, a float connecting rod, a flushing water pipe, and an isolation tank. In actual production, this level detection device faces the following three problems that urgently need to be addressed:

[0006] (1) For some coarse-particle, high-concentration mineral processing processes, the isolation tanks of conventional flotation machines are prone to clogging, leading to the failure of liquid level detection. The main reason is that the lower end of the isolation tank adopts a conical constriction or duckbill structure to resist slurry disturbance and block air bubbles, but the small opening area leads to clogging at the bottom of the tank;

[0007] (2) In mineral processing processes where the viscosity of the slurry foam is high, the foam will climb to the top of the isolation tank, thereby contaminating the reflector and causing the laser rangefinder to fail.

[0008] (3) Currently, only liquid slurry can enter the isolation tank. The density of the slurry inside the isolation tank is different from that of the outside slurry, which leads to deviations in liquid level detection. This may cause liquid level loss of control, especially in scenarios with extremely thin foam layers of 0-20mm.

[0009] Meanwhile, the froth output of the flotation machine has a significant impact on mineral processing indicators and output. However, the current detection technology mostly uses foam image technology to identify the foam flow rate, which has the disadvantages of large measurement errors and extremely high costs. Summary of the Invention

[0010] The purpose of this invention is to provide a joint detection device for flotation machine slurry level and foam production, which can solve the problem of large foam measurement error in the prior art;

[0011] This invention provides a joint detection device for flotation machine slurry level and foam production, which includes an isolation tank, a level measuring instrument, and a foam production measuring instrument;

[0012] The liquid level measuring instrument is installed at the top of the isolation tank, and the foam production measuring instrument is installed on one side of the isolation tank;

[0013] The isolation tank is set inside the flotation cell, and the foam production measuring instrument is set opposite to the foam cell.

[0014] The level gauge and foam production gauge detect the level and foam production of the flotation machine respectively and perform interlocking control. The foam production is set within a fixed range. When the foam value detected by the foam production gauge exceeds the fixed range, the level of the flotation machine is adjusted.

[0015] Preferably, both the liquid level measuring instrument and the foam production measuring instrument are mounted on the isolation tank via measuring instrument brackets;

[0016] The measuring instrument bracket includes a slide rail, a slider, and a support plate;

[0017] The slide rail is fixed on the isolation barrel, the slider is set on the slide rail, and a locking screw is provided between the slider and the slide rail;

[0018] The support plate is fixed on the slider, and the support plate is provided with measuring instrument mounting holes;

[0019] The isolation tank is also equipped with a rinsing water pipe, which is mounted on the measuring instrument bracket.

[0020] Preferably, the liquid level measuring instrument uses a laser sensor, and the foam sensor uses an ultrasonic rangefinder.

[0021] Preferably, the isolation bucket is provided with a flange, and the measuring instrument bracket is mounted on the flange.

[0022] Preferably, the isolation tank is equipped with a float, a float connecting rod, and a reflector.

[0023] The float and the reflector are connected by a float connecting rod, and the reflector is positioned opposite to the liquid level measuring instrument.

[0024] Preferably, the float is a large diameter-to-height ratio float, and the diameter of the float is at least twice the height of the float.

[0025] Preferably, the float is a capsule-shaped float with a diameter of 150 mm and a height of 75 mm.

[0026] Preferably, the bottom of the isolation barrel is provided with an umbrella-shaped conical bottom, and there is a gap between the umbrella-shaped conical bottom and the isolation barrel.

[0027] Preferably, the cone angle of the umbrella-shaped cone base is 45°.

[0028] Preferably, the umbrella-shaped conical bottom is connected to the isolation barrel body by a stiffening plate.

[0029] Preferably, the upper part of the isolation barrel has an upper strip-shaped hole, and the lower part of the isolation barrel has a lower strip-shaped hole.

[0030] Beneficial effects:

[0031] By setting up a liquid level meter and a foam production meter, the joint detection of the flotation machine liquid level and foam production is realized. When interlocking control is performed, the foam production can be set within a fixed range. When the foam value detected by the foam production meter exceeds the fixed range, the liquid level of the flotation machine is adjusted for automatic regulation, thereby achieving stable control of the flotation machine foam production and effectively ensuring the flotation recovery rate. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A three-dimensional structural schematic diagram of the flotation machine slurry level and foam production joint detection device provided for a specific embodiment of the present invention;

[0034] Figure 2 A front view of the flotation machine slurry level and froth production joint detection device provided in a specific embodiment of the present invention;

[0035] Figure 3 for Figure 2 Sectional view in the direction of “AA”;

[0036] Figure 4 A three-dimensional structural schematic diagram of the flotation machine slurry level and foam production joint detection device provided for a specific embodiment of the present invention from another angle;

[0037] Figure 5 The pressure difference distribution inside and outside the existing isolation tank (the lower end of the isolation tank adopts a duckbill structure) is 1.7 kPa.

[0038] Figure 6 The pressure difference distribution inside and outside the umbrella-shaped conical bottom isolation barrel provided for a specific embodiment of the present invention (the pressure difference is 0.078 kPa);

[0039] Figure 7 The flow velocity distribution of the existing isolation barrels (all of which use a duckbill structure at the bottom);

[0040] Figure 8 The flow velocity distribution of the umbrella-shaped conical bottom isolation barrel is provided for a specific embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1: Isolation tank; 2: Measuring instrument bracket; 3: Flushing water pipe; 4: Float; 5: Float connecting rod; 6: Reflector; 7: Umbrella-shaped cone bottom; 8: Upper strip hole; 9: Lower strip hole;

[0043] 21: Slide rail, 22: Slider, 23: Support plate. Detailed Implementation

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not 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 limiting this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] like Figures 1 to 4 As shown, this embodiment provides a joint detection device for flotation machine slurry level and foam production, which includes an isolation tank 1, a level measuring instrument, and a foam production measuring instrument.

[0048] The liquid level measuring instrument is set at the top of the isolation tank 1, and the foam production measuring instrument is set on one side of the isolation tank 1. The isolation tank 1 is set inside the flotation cell, and the foam production measuring instrument is set opposite to the foam cell.

[0049] The foam formed inside the flotation machine is higher than the overflow weir, so it flows from high to low into the foam collection tank. The more foam accumulates in the foam tank, the more foam is produced in the flotation, and the more products are produced. Therefore, a foam production measuring instrument is installed on the isolation tank 1 to measure the foam production.

[0050] The foam production of a flotation machine is directly related to the liquid level inside the flotation cell. A higher liquid level results in a larger foam production, while a lower liquid level results in a smaller foam production.

[0051] In this embodiment, by setting up a liquid level measuring instrument and a foam production measuring instrument, the joint detection of the flotation machine liquid level and foam production is realized. When interlocking control is performed, the foam production can be set within a fixed range. When the foam value detected by the foam production measuring instrument exceeds the fixed range, the liquid level of the flotation machine is adjusted for automatic regulation, thereby achieving stable control of the flotation machine foam production and effectively ensuring the flotation recovery rate.

[0052] The specific method for automatically regulating the flotation machine liquid level is as follows: the correspondence between foam value and liquid level value is obtained through experiments, the liquid level of the flotation machine is controlled according to the height of foam, and the liquid level of the flotation machine is detected by a liquid level measuring instrument to see if the liquid level of the flotation machine has reached the target value.

[0053] Both the liquid level measuring instrument and the foam production measuring instrument are mounted on the isolation tank 1 via the measuring instrument bracket 2. The measuring instrument bracket 2 includes a slide rail 21, a slider 22, and a support plate 23.

[0054] The slide rail 21 is fixed on the isolation barrel 1, the slider 22 is set on the slide rail 21, and a locking screw is provided between the slider 22 and the slide rail 21.

[0055] The support plate 23 is fixed on the slider 22, and the support plate 23 is provided with measuring instrument mounting holes.

[0056] Specifically, the liquid level measuring instrument is fixed as follows: the support plate 23 is a T-shaped bracket with a central circular hole for mounting the liquid level measuring instrument, which uses a laser sensor. The T-shaped bracket has four bolt holes for connection to the slider 22, which is tightly connected to the guide rail groove. Additionally, the slider 22 has a horizontal locking nut for position fixation. Similarly, the foam production measuring instrument uses a similar structure, but its sensor type is an ultrasonic rangefinder. This is mainly because the measured surface, consisting of air bubbles, indicates unevenness, making ultrasonic detection more suitable.

[0057] The isolation tank 1 is also equipped with a flushing water pipe 3, which is mounted on the measuring instrument bracket 2. The flushing water pipe 3 is used to flush the float 4. The flushing water pipe 3 is an L-shaped structure made of stainless steel hollow tube, used to clean the mineral particles or scale adhering to the surface of the float 4. In addition, a longitudinal pipe is set at one end of the flushing water pipe 3. The longitudinal pipe is approximately 300mm long and has a diameter of 15mm. The float connecting rod 5 passes through the longitudinal pipe and serves as a guide for the float connecting rod 5.

[0058] A flange is installed on the isolation bucket 1, and the measuring instrument bracket 2 is installed on the flange.

[0059] The isolation tank 1 is equipped with a float 4, a float connecting rod 5 and a reflector 6. The float 4 and the reflector 6 are connected by the float connecting rod 5, and the reflector 6 is positioned opposite to the liquid level measuring instrument.

[0060] Float 4 is a capsule-shaped float. The float is designed with a large diameter-to-height ratio, meaning that the diameter of the float is at least twice the height of the float. For example, the diameter of float 4 is 150mm and the height is 75mm. The diameter of the float is determined according to the inner diameter of the isolation tank 1. For example, the diameter of float 4 is half the inner diameter of the isolation tank 1. There needs to be a gap between the edge of the float and the isolation tank 1.

[0061] According to the formula ρgv=mg=hs, when the slurry density ρ changes, V will also change, thus affecting the draft h. When the cross-sectional area s of the float 4 increases significantly, the draft h decreases significantly. Therefore, using the large diameter-to-height ratio capsule float 4 results in a smaller change in draft compared to ordinary spherical floats, thus effectively resisting the interference of changes in slurry specific gravity.

[0062] The bottom of the isolation barrel 1 is provided with an umbrella-shaped conical bottom 7, and there is a gap between the umbrella-shaped conical bottom 7 and the isolation barrel 1.

[0063] Specifically, the isolation barrel 1 is made of 304 stainless steel. The cone angle of the umbrella-shaped conical base 7 is 45°. The umbrella-shaped conical base 7 is connected to the barrel body of the isolation barrel 1 by a stiffening plate. The vertical distance between the lower end of the straight cylinder and the conical base surface is 300mm. The minimum clearance between the conical barrel and the inner hole of the isolation barrel 1 is controlled to be 40mm, and the effective flow cross-sectional area is not less than 45% of the cross-sectional area of ​​the isolation barrel 1. Figure 7 , Figure 8 As shown, in order to minimize local eddy currents and turbulence at the outlet of the fluid in the isolation tank 1, the maximum outer diameter of the cone bottom is 360 mm, which is 20% larger than the inner diameter of the isolation tank 1. This is done while minimizing the interference of the slurry flow in the tank on the float 4, and minimizing the resistance of the gradually narrowing flow at the bottom of the isolation tank 1.

[0064] like Figures 5 to 6 As shown, through simulation calculations, the internal and external pressure difference of the umbrella-shaped conical bottom isolation tank 1 is only 5% of that of the traditional isolation tank 1 (the pressure difference decreases from 1.7 kPa to 0.078 kPa). The flow velocity change inside the isolation tank 1 is small, effectively reducing the local resistance coefficient of foam leakage. This effectively reduces the amount of foam and rinsing water flowing out of the isolation tank 1 and into the tank when the level gauge is being cleaned.

[0065] The upper part of the isolation barrel has an upper strip-shaped hole 8, and the lower part of the isolation barrel 1 has a lower strip-shaped hole 9. At a height of 150mm from the top surface of the isolation barrel, four strip-shaped holes, each 100mm wide and 300mm high, are made to allow adhering air bubbles inside the isolation barrel to quickly escape through these holes, preventing them from contaminating the reflector plate 6 or depositing and clogging the isolation barrel. Additionally, three strip-shaped holes, each 180×300mm, are made at a distance of 150mm from the bottom of the isolation barrel 1 to ensure timely drainage of flushing water and accumulated ore at the bottom.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined froth production and pulp level detection device for a flotation machine, characterized in that, This includes isolation tanks, liquid level gauges, and foam production gauges; The liquid level measuring instrument is installed at the top of the isolation tank, and the foam production measuring instrument is installed on one side of the isolation tank; The isolation tank is set inside the flotation cell, and the foam production measuring instrument is set opposite to the foam cell. The level measuring instrument and the foam production measuring instrument detect the level and foam production of the flotation machine respectively, and perform interlocking control. The foam production is set within a fixed range. When the foam value detected by the foam production measuring instrument exceeds the fixed range, the level of the flotation machine is adjusted. The isolation tank is equipped with a float, a float connecting rod, and a reflector. The float and the reflector are connected by a float connecting rod, and the reflector is positioned opposite to the liquid level measuring instrument. The float is a large diameter-to-height ratio float, and the diameter of the float is at least twice the height of the float; The bottom of the isolation barrel is provided with an umbrella-shaped conical bottom, and there is a gap between the umbrella-shaped conical bottom and the isolation barrel; The upper part of the isolation barrel has an upper strip-shaped hole, and the lower part of the isolation barrel has a lower strip-shaped hole.

2. The flotation machine slurry level and froth production joint detection device according to claim 1, characterized in that, Both the liquid level measuring instrument and the foam production measuring instrument are mounted on the isolation tank via measuring instrument brackets; The measuring instrument bracket includes a slide rail, a slider, and a support plate; The slide rail is fixed on the isolation barrel, the slider is set on the slide rail, and a locking screw is provided between the slider and the slide rail; The support plate is fixed on the slider, and the support plate is provided with measuring instrument mounting holes; The isolation tank is also equipped with a rinsing water pipe, which is mounted on the measuring instrument bracket.

3. The flotation machine slurry level and froth production joint detection device according to claim 2, characterized in that, The isolation barrel is equipped with a flange, and the measuring instrument bracket is mounted on the flange.

4. The flotation machine slurry level and froth production joint detection device according to claim 1, characterized in that, The float is a capsule-shaped float with a diameter of 150 mm and a height of 75 mm.

5. The flotation machine slurry level and froth production joint detection device according to claim 1, characterized in that, The cone angle of the umbrella-shaped cone base is 45°.

6. The flotation machine slurry level and froth production joint detection device according to claim 1, characterized in that, The umbrella-shaped conical bottom is connected to the isolation barrel body by stiffening plates.

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