Laboratory flash flotation machine test system

Abstract

The invention provides a laboratory flash flotation machine testing system, and relates to the technical field of mineral separation. The system comprises a stirring tank, a peristaltic pump and a flash flotation machine which are sequentially communicated, the flash flotation machine comprises a cylinder, the cylinder comprises a cylinder section and a cone section, a stirring mechanism is arranged in the cylinder section, a foam tank is arranged at the top of the cylinder section, an outlet of the foam tank is connected to a concentrate collecting barrel, and a middle gate valve is arranged in the cylinder section; a first tailing outlet is formed in the middle of the outer wall, the first tailing outlet can be communicated with and isolated from the interior of the barrel by opening and closing the middle gate valve, a second tailing outlet is formed in the bottom end of the cone section, and the first tailing outlet and the second tailing outlet are both connected to a tailing collecting barrel. According to the system, the adaptability to coarse particles and high-concentration ore pulp can be improved, the liquid level control stability of the flotation machine can be maintained under the condition of continuous ore feeding and discharging, and therefore it is guaranteed that test data have higher process representativeness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ore dressing, in particular to a laboratory flash flotation machine test system. BACKGROUND

[0002] The flash flotation machine has a unique ore feeding and discharging structure, which can cope with the impact of coarse particle high concentration slurry that the conventional flotation machine cannot adapt to. It is generally used to treat the cyclone underflow of the grinding classification circuit to recover the already dissociated easy-to-float minerals, so as to achieve the purpose of early recovery, avoiding overgrinding of minerals, reducing grinding power consumption and improving flotation recovery rate. Flash flotation is generally carried out under the process conditions of high concentration (mass concentration of 60% or more) and coarse particles (maximum particle diameter of 1mm or more). The content of fine mud is low, which reduces the harmful effect of fine mud on flotation, increases the floatability difference between useful minerals and gangue, and makes the already dissociated useful minerals float quickly in a short time, while the gangue and some coarse particle intergrowths do not have enough time to float, becoming tailings products, thereby realizing the separation of useful minerals and gangue. Compared with conventional flotation, it is more conducive to producing high-grade concentrate.

[0003] After the grinding classification cyclone underflow enters the flash flotation machine for separation, the flash flotation machine underflow returns to the mill. A bypass is generally required in the process. When the flash flotation machine feed is controlled or the equipment is maintained, the cyclone underflow can be directly returned to the mill. In the grinding classification circuit, the addition of the flash flotation machine requires a full understanding of the properties of the ore and the floatability of the target mineral. It is also necessary to pay attention to the stability of the grinding and flotation process, to improve the recovery rate while ensuring the concentrate grade. In order to reduce technical risks, laboratory tests need to be carried out before engineering practice.

[0004] There is no test system for carrying out flash flotation process on the market at present. Generally, the conventional flotation machine is used as the main equipment for process research. Through batch test method, the floatation speed of target minerals, fine mud entrainment, concentrate enrichment ratio and operation recovery rate are evaluated according to the flotation index, so as to estimate the degree of advance recovery of recoverable minerals, thereby reducing the grinding power consumption and overgrinding probability.

[0005] The flash flotation machine has coarse feeding particle size, high concentration, and harsh process conditions. In particular, the bottom slurry of the flash flotation machine has high content of coarse particles. After concentration by the cone, the concentration is increased, the flowability of the slurry is poor, and the bottom discharge pipe is blocked, which is one of the main problems affecting the stability of the flash flotation process. The industrial or semi-industrial scale flash flotation machine has a large slurry treatment capacity. Under the condition of ensuring a certain slurry treatment capacity, the slurry flow velocity in the discharge pipe can be increased by increasing the discharge liquid level difference and reducing the diameter of the discharge pipe at the bottom of the flotation machine, so as to ensure the smooth flow of the coarse particle and high concentration slurry. For the laboratory scale equipment, the slurry treatment capacity is greatly reduced, and the mineral particle size does not change. If the method of increasing the discharge liquid level difference, reducing the pipe diameter, and increasing the slurry flow velocity in the discharge pipe is still used to promote the flow of coarse particle and high concentration slurry, the diameter of the discharge pipe is often only a few millimeters, which is in the same order of magnitude as the maximum mineral particle size in the slurry, and is also prone to blockage of the discharge pipe. In addition, because the amount of slurry discharged from the bottom of the flotation machine is relatively small, the coarse particles cannot be carried away by the slurry in time, and will accumulate at the bottom of the flotation machine, increasing the probability of pipe blockage. Therefore, in the process of flash flotation process test carried out by using the conventional laboratory flotation machine, it is difficult to realize stable and continuous discharge of the slurry. At present, only batch test, but not continuous test, can be used, and the process representativeness of the test data is greatly reduced.

[0006] In view of the above reasons, the present application provides a laboratory flash flotation machine test system, which aims to improve the adaptability of the laboratory scale flash flotation machine test system to coarse particles and high concentration slurry, so as to maintain the stability of the flotation machine liquid level control under the condition of continuous feeding and discharging of the slurry, thereby ensuring that the test data has stronger process representativeness. SUMMARY

[0007] The present application aims to provide a laboratory flash flotation machine test system, which can improve the adaptability to coarse particles and high concentration slurry, so as to maintain the stability of the flotation machine liquid level control under the condition of continuous feeding and discharging of the slurry, thereby ensuring that the test data has stronger process representativeness.

[0008] The application provides a laboratory flash flotation machine test system, which comprises a stirring tank, a peristaltic pump and a flash flotation machine connected in sequence, the flash flotation machine comprises a barrel, the barrel comprises a columnar section and a conical section sealingly connected to the bottom of the columnar section, a stirring mechanism is arranged in the columnar section, a froth tank is arranged at the top of the columnar section, the outlet of the froth tank is connected to a concentrate collecting barrel, a middle gate valve is arranged in the columnar section, a first tailing outlet is arranged at the middle of the outer wall of the columnar section, the first tailing outlet is communicated with or isolated from the inside of the barrel by opening or closing the middle gate valve, a second tailing outlet is arranged at the bottom end of the conical section, and the first tailing outlet and the second tailing outlet are both connected to a tailing collecting barrel.

[0009] Preferably, an overflow weir is arranged at the top of the columnar section, and the concentrate flows out of the outlet of the froth tank after overflowing the overflow weir with froth.

[0010] Preferably, the middle gate valve comprises a gate plate, an operating handle and a separation box, the separation box is surrounded by the inner wall of the columnar section, a bottom plate, two side wall plates and a front wall plate, an opening is arranged on the front wall plate, and the gate plate can be moved by the operating handle to open or close the opening on the front wall plate.

[0011] Preferably, an air inlet is arranged at the top of the columnar section.

[0012] Preferably, the stirring mechanism comprises a stirring shaft, a shearing impeller and a motor, the shearing impeller is mounted at the bottom end of the stirring shaft, the top end of the stirring shaft penetrates through the froth tank and is fixedly connected with the output shaft of the motor, and the motor is fixed to the upper surface of the froth tank.

[0013] Preferably, the conical section comprises a cone, an inclined plate arranged at the bottom of the cone and a circulating pipe, an opening is arranged on the inclined plate and communicated with the circulating pipe, and the bottom of the circulating pipe is communicated with the second tailing outlet through a connecting pipe.

[0014] Preferably, a ball valve is arranged in the second tailing outlet.

[0015] Preferably, the circulating pipe is arranged in parallel with the inclined plate, the length of the circulating pipe is greater than the diameter of the inclined plate, and the top of the circulating pipe is integrally connected with the outer wall of the cone.

[0016] Preferably, a sand pump is further arranged, the bottom end of the circulating pipe is communicated with the inlet of the sand pump through a first hose, and the top end of the circulating pipe is communicated with the outlet of the sand pump through a second hose.

[0017] Preferably, the first hose and the second hose are both PU tubes.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] 1. The system controls the liquid level in the flotation machine by adopting the mode of discharging through the first tailing outlet in the middle part and the second tailing outlet in the bottom part, the tailings discharged from the first tailing outlet in the middle part are relatively low in concentration and fine in particle size, can be frequently changed, and are the main undertakers of the liquid level control process, the tailings discharged from the second tailing outlet in the bottom part are relatively high in concentration and coarse in particle size, can be kept in a constant open state, and play an auxiliary role in the liquid level control process, the two outlets are jointly controlled in liquid level through valves, and have the technical advantages of stability, directness and easy operation.

[0020] 2. The system improves the adaptability to coarse particles and high-concentration ore slurry, can maintain the stability of the liquid level control of the flotation machine under the condition of continuous ore feeding and discharging, and thus ensures that the test data have stronger process representativeness. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 It is a whole connection principle diagram of the laboratory flash flotation machine test system of the present application;

[0023] Figure 2 It is a specific structure schematic diagram of the flash flotation machine in the present application;

[0024] Figure 3 It is a cross-sectional schematic diagram of the middle gate valve of the flash flotation machine in the present application after longitudinal sectioning;

[0025] Figure 4 It is Figure 3 It is a top view schematic diagram along the A direction;

[0026] Figure 5 It is a front view structure schematic diagram of the cone section of the flash flotation machine in the present application;

[0027] Figure 6 It is Figure 5 It is a top view schematic diagram along the B direction;

[0028] EXPLANATION OF REFERENCE NUMERALS:

[0029] 100: agitator tank; 200: peristaltic pump; 300: flash flotation machine; 310: agitation mechanism; 320: froth tank; 330: mid-plate valve; 331: operating handle; 332: side wall plate; 333: gate plate; 334: bottom plate; 335: front wall plate; 340: first tailings outlet; 350: sand pump; 360: second tailings outlet; 370: cone section; 371: cone; 372: ramp; 373: recirculation pipe; 374: connection pipe; 375: ball valve; 380: column section; 390: feed inlet; 400: concentrate collection bucket; 500: tailings collection bucket. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] As Figures 1-6As shown, the present application provides a laboratory flash flotation machine test system, comprising: a stirring tank 100, a peristaltic pump 200 and a flash flotation machine 300 connected in turn, the flash flotation machine 300 comprising a cylinder with an open top, the cylinder comprising a cylindrical section 380 and a conical section 370 sealingly connected to the bottom of the cylindrical section 380, wherein the lower side wall of the cylindrical section 380 is provided with a feed opening 390 through which the ore pulp is injected into the cylinder, a stirring mechanism 310 is arranged in the cylindrical section 380, the top of the cylindrical section 380 is provided with an air inlet through which air can be introduced, the stirring mechanism 310 comprises a stirring shaft, a shear impeller and a motor, the shear impeller is mounted at the bottom end of the stirring shaft, the stirring mechanism 310 is used to mix the ore pulp and air and shear the air into small bubbles, the top of the cylindrical section 380 is provided with a froth tank 320, the top end of the stirring shaft passes through the froth tank 320 and is fixedly connected with the output shaft of the motor, the motor is fixed to the upper surface of the froth tank 320, the froth tank 320 is used to collect the froth product of the flash flotation machine 300, an outlet channel is arranged between one side of the froth tank 320 and the cylindrical section 380, an overflow weir is arranged at the top of the cylindrical section 380, the outlet of the froth tank 320 is connected to a concentrate collection bucket 400, and the concentrate flows out of the outlet of the froth tank 320 to the concentrate collection bucket 400 for collection after overflowing from the overflow weir. A middle gate valve 330 is arranged in the cylindrical section 380, a first tailings outlet 340 is arranged at the middle of the outer wall of the cylindrical section 380, and the first tailings outlet 340 can be connected with and isolated from the internal space of the cylinder by opening and closing the middle gate valve 330, and a second tailings outlet 360 is arranged at the bottom end of the conical section 370, and the first tailings outlet 340 and the second tailings outlet 360 are both connected to a tailings collection bucket 500.

[0034] The working principle of the above laboratory flash flotation machine test system is as follows: a certain volume of water is first added to the stirring tank 100, then a certain particle size composition of a certain mineral is added, and the stirring forms an ore pulp of a certain concentration, and then flotation reagents are added, and after being mixed thoroughly, the ore pulp is fed into the ore pulp inlet of the flash flotation machine 300 through the peristaltic pump 200; air enters from the top inlet of the flash flotation machine 300 and is fully mixed with the ore pulp under the stirring action of the stirring mechanism 310, the air is sheared into small bubbles and collides with the mineral particles in the ore pulp to form mineralized bubbles, the froth layer formed by the rising of the mineralized bubbles enters the froth tank 320 to become a concentrate product and then flows into the concentrate collection bucket 400 for collection, the mineral particles that are not adhered to the bubbles are divided into two parts, one part is discharged from the first tailings outlet 340 through the middle gate valve 330 of the flash flotation machine 300 to form tailings 1, and the other part is discharged from the second tailings outlet 360 at the bottom of the conical section 370 to form tailings 2, and the tailings 1 and the tailings 2 are combined and collected into the tailings collection bucket 500.

[0035] In the embodiment, the middle gate valve 330 comprises a gate 333, an operating handle 331 and a partition box which is surrounded by the inner wall of the column segment 380 and the bottom plate 334, two side wall plates 332 and the front wall plate 335, wherein the front wall plate 335 is provided with a square opening, the gate 333 is arranged close to the outer wall of the front wall plate 335 and has an area larger than that of the square opening, and the gate 333 can be moved up and down by the operating handle to open, close and adjust the opening degree of the square opening on the front wall plate 335.

[0036] In the embodiment, the cone segment 370 comprises a cone 371 and an inclined plate 372 and a circulating pipe 373 which are arranged at the bottom of the cone 371, the orthographic projection of the inclined plate 372 is a circle, the inclined plate 372 is provided with an opening which is communicated with the circulating pipe 373, the circulating pipe 373 is arranged in parallel with the inclined plate 372, the length of the circulating pipe 373 is greater than the diameter of the inclined plate 372, the top of the circulating pipe 373 is integrally connected with the outer wall of the cone 371, the bottom outlet of the outer wall of the circulating pipe 373 corresponds to the opening of the inclined plate 372 and is communicated with the second tailing outlet 360 through a connecting pipe 374, the second tailing outlet 360 is provided with a ball valve 375, the bottom end (lower end) of the circulating pipe 373 is communicated with the inlet of the sand pump 350 through a first hose, and the top end (higher end) of the circulating pipe 373 is communicated with the outlet of the sand pump 350 through a second hose, and the first hose and the second hose are both PU pipes.

[0037] In the working process of the flash flotation machine 300, the thickness of the froth layer needs to be adjusted by liquid level control. The system adjusts the liquid level height in the flash flotation machine 300 by balancing the changes in the amounts of the feed ore, the tailings 1 and the tailings 2. To ensure that the tailings 2 with relatively coarse particles and high concentration are smoothly discharged, the tailings 2 first move downward along the cone 371 to the inclined plate 372 (divided into two parts by the circulating pipe 373), and then enter the circulating pipe 373 (similar in shape to a small chute). Since the circulating pipe 373 is parallel to the inclined plate 372 and is arranged at a certain angle below the cone 371, the lower end of the circulating pipe 373 is connected to the inlet of the sand pump 350, and the upper end is connected to the outlet of the sand pump 350. Under the action of the sand pump 350, the ore pulp in the circulating pipe 373 is forced to move obliquely downward. That is, the mineral particles above the outlet of the connecting pipe 374 are always in a state of motion and will not be static, sedimentary or accumulated. The connecting pipe 374 will continuously discharge loose materials. To further reduce the probability of blockage of the connecting pipe 374, the ball valve 375 connected thereto will remain at a certain opening, and the flow of the ore pulp (which should be less than the amount of the feed ore) will remain basically unchanged. Therefore, the liquid level control process in the flash flotation machine 300 is actually mainly a process of balancing the changes in the amounts of the feed ore and the tailings 1. The upper edge of the gate 333 of the middle gate valve 330 is the position of the liquid level of the ore pulp in the flotation machine 300. By adjusting the position of the upper edge of the gate 333 through the handle 331, the liquid level height of the ore pulp in the flotation machine 300 can be changed. The tailings 1 enter the separation box through the square hole on the front wall plate 335 and then are discharged through the first tailings outlet 340 on the side wall of the column section 380.

[0038] The present application controls the liquid level in the flotation machine by adopting the middle gate valve 330 and the bottom ball valve 375 to discharge in a divided manner. The tailings discharged by the middle gate valve 330 have relatively low concentration and relatively fine particle size, and can be frequently changed, so it is the main undertaker of the liquid level control process. The tailings discharged by the bottom ball valve 375 have relatively high concentration and relatively coarse particle size, and can remain in an open state, so it plays an auxiliary role in the liquid level control process. The combined liquid level control method of the two valves has the technical advantages of stability, directness and easy operation. The cone 371 and the circulating pipe 373 are arranged at the bottom of the flash flotation machine 300, and the sand pump 350 is provided. The sand pump 350 circulates the ore pulp to keep the mineral particles in the cone bottom and the circulating pipe 373 in a loose state, which greatly reduces the probability of blockage when the bottom ball valve 375 discharges coarse particle high concentration tailings, so that the continuous test process of the laboratory scale flash flotation machine can be realized.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A laboratory flash flotation machine test system, characterized in that, The utility model relates to a flotation device for separating fine particles from slurry, comprising: a stirring tank, a peristaltic pump and a flash flotation machine connected in sequence, the flash flotation machine comprises a cylinder, the cylinder comprises a column section and a cone section sealingly connected with the bottom of the column section, a stirring mechanism is arranged in the column section, a froth tank is arranged at the top of the column section, the outlet of the froth tank is connected to a concentrate collection barrel, a middle gate valve is arranged in the column section, a first tailings outlet is arranged at the middle of the outer wall of the column section, the first tailings outlet can be communicated with or isolated from the inside of the cylinder by opening and closing the middle gate valve, a second tailings outlet is arranged at the bottom end of the cone section, and the first tailings outlet and the second tailings outlet are both connected to a tailings collection barrel.

2. The laboratory flash flotation machine test system according to claim 1, characterized in that, An overflow weir is arranged at the top of the column section, and the concentrate flows out of the outlet of the froth tank after overflowing from the overflow weir with froth.

3. The laboratory flash flotation machine test system of claim 1, wherein, The middle gate valve comprises a gate, an operating handle and a partition box, the partition box is surrounded by the inner wall of the column section, a bottom plate, two side wall plates and a front wall plate, an opening is arranged on the front wall plate, and the gate can be moved by the operating handle to open or close the opening on the front wall plate.

4. The laboratory flash flotation machine test system of claim 1, wherein, An air inlet is arranged at the top of the column section.

5. The laboratory flash flotation machine test system of claim 1, wherein, The stirring mechanism comprises a stirring shaft, a shearing impeller and a motor, the shearing impeller is mounted at the bottom end of the stirring shaft, the top end of the stirring shaft penetrates through the froth tank and is fixedly connected with the output shaft of the motor, and the motor is fixed to the upper surface of the froth tank.

6. The laboratory flash flotation machine test system of claim 1, wherein, The cone section comprises a cone, an inclined plate arranged at the bottom of the cone and a circulating pipe, an opening is arranged on the inclined plate and is communicated with the circulating pipe, and the bottom of the circulating pipe is communicated with the second tailings outlet through a connecting pipe.

7. The laboratory flash flotation machine test system according to claim 6, characterized in that, A ball valve is arranged in the second tailings outlet.

8. The laboratory flash flotation machine test system of claim 6, wherein, The circulating pipe is arranged in parallel with the inclined plate, the length of the circulating pipe is greater than the diameter of the inclined plate, and the top of the circulating pipe is integrally connected with the outer wall of the cone.

9. The laboratory flash flotation machine test system of claim 8, wherein, A sand pump is further arranged, the bottom end of the circulating pipe is communicated with the inlet of the sand pump through a first hose, and the top end of the circulating pipe is communicated with the outlet of the sand pump through a second hose.

10. The laboratory flash flotation machine test system of claim 9, wherein, The first hose and the second hose are both PU tubes.

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