Automatic control device for pH value of flotation pulp

Abstract

The utility model relates to the technical field of pH adjustment, in particular to an automatic flotation pulp pH value control device which comprises a smashing mechanism composed of a central grinding roller and edge grinding rollers. The central grinding roller is of a conical structure and is arranged at the upper end of the support, the six sets of edge grinding rollers are distributed around one side of the periphery of the central grinding roller at equal intervals, and an auxiliary heating drying module for evaporating moisture in lime is arranged in the smashing mechanism; according to the utility model, the crushing mechanism and the auxiliary heating drying module are arranged on the hopper in the original PH value control device, so that damp lime can be ground, crushed and dried at the same time, the blockage of a conveying channel caused by damp and caking of the lime is avoided, the moisture in the lime can be further removed, and the quality of the lime is improved. The adverse effect on accurate adjustment of the pH value of the ore pulp is reduced, and the problems that a hopper for adjusting the pH value of the flotation ore pulp is close to a flotation tank, internal lime is prone to being damped, a feeding channel is blocked, and damped lime blocks affect accurate adjustment of the pH value are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pH adjustment, in particular to an automatic control device for the pH value of flotation pulp. Background Art

[0002] In the pulp with a high pH value, since there are more OH- ions in the pulp, a large amount of OH- is adsorbed on the surface of the ore particles, which will increase the hydrophilicity of the ore particle surface and hinder the adsorption of collector anions. The size of the pH value also directly affects the ζ potential on the surface of the ore particles. Especially for the flotation of some oxidized ores, due to different pH values, different flotation reagents are used. That is to say, the flotation reagents need to be dissociated into ions before they can act on the mineral surface. And the amount of the flotation reagents dissociated into effective ions has a great relationship with the pH value.

[0003] In the process of flotation pulp, the initial pH value of the pulp is lower than 7-10. It is necessary to manually measure the pH value of the pulp and add an appropriate amount of lime according to the current pH value to raise the pH value. The existing Chinese utility model patent with the authorization publication number of CN219424623U discloses an automatic control device for the pH value of flotation pulp, including a feeding mechanism. A control panel is installed on the outer wall of the feeding mechanism. A wire is fixedly connected to the side of the control panel, and the other end of the wire is fixedly connected to a pH value measuring mechanism. The feeding mechanism includes a feeding cylinder. One end of the feeding cylinder is fixedly connected with an end plate. A feeding motor is installed on the other side of the end plate. The output end of the feeding motor penetrates the end plate and is fixedly connected with a feeding auger. A connecting pipe is fixedly connected to the top of the outer wall of the feeding cylinder, and a material hopper is fixedly connected to the top of the connecting pipe. Through the set pH value measuring mechanism, the current pH value of the pulp can be detected inside the pulp. The control panel controls the feeding mechanism to add regulators such as lime located inside the material hopper into the pulp according to the current pH value of the pulp, so as to adjust the overall pH value of the pulp. However, for the existing such automatic control device for the pH value of flotation pulp, in order to ensure timely and rapid feeding, the hopper for storing lime is set very close to the flotation tank. The lime inside is easy to get damp and caked due to the rising water vapor in the flotation tank, resulting in blockage of the hopper outlet and poor discharging. In addition, the damp lime blocks will also have an adverse impact on the method of accurately controlling the feeding to adjust the pH value.

[0004] Therefore, aiming at the problems that the hopper for adjusting the pH value of the flotation pulp is close to the flotation tank, the lime inside is easy to get damp, blocking the feeding channel, and the damp lime blocks affect the accurate adjustment of the pH value, an automatic control device for the pH value of flotation pulp that can reduce the influence of lime dampness can be designed. Summary of the Utility Model

[0005] In order to overcome the problems that the hopper for adjusting the pH value of the flotation pulp is close to the flotation tank, the internal lime is prone to moisture absorption, blocking the feeding channel, and the moist lime blocks affect the precise adjustment of the pH value.

[0006] The technical solution of the present utility model is: an automatic pH control device for flotation pulp, which includes a hopper arranged above the flotation tank, a through pipe connected to the discharge port at the lower end of the hopper, a control valve installed on one side of the discharge port of the hopper, a feeder installed at one end of the through pipe, the other end of the through pipe is connected to a feed pipe extending into the flotation tank, and a pH measuring machine for detecting the pH value of the pulp and extending into the flotation tank is arranged on one side of the feed pipe. It also includes a crushing mechanism composed of a central grinding roller and an edge grinding roller; the feeder is composed of a motor at the end of the through pipe and an auger inside the through pipe, and the motor drives the auger to rotate and convey lime. A hollow table-shaped bracket is fixedly installed in the hopper. The central grinding roller is of a conical structure and is arranged at the upper end of the bracket. There are six groups of edge grinding rollers evenly distributed around the outer periphery of the central grinding roller. Dense flanges are arranged on the outer walls of the hollow central grinding roller and the hollow edge grinding rollers. The central grinding roller and the edge grinding roller are both driven to rotate by motors arranged in the bracket, and an auxiliary heat drying module for evaporating the moisture in the lime is arranged in the crushing mechanism.

[0007] Preferably, the pH measuring machine detects the pH value of the pulp, converts the detected pH value data into an electrical signal and sends it to the control valve and the feeder. The control valve is activated to open the valve plate in the discharge port of the hopper, and the lime falls from the hopper into the through pipe. The motor in the feeder drives the auger to convey the lime, so that the lime enters the flotation tank from the feed pipe to improve the pH value of the pulp. The opening and closing time of the control valve is calculated by the computer according to the actual pH value of the pulp and the required lime material. During the whole flotation process, the crushing mechanism composed of the central grinding roller and the edge grinding roller continuously grinds and crushes the moist and caked lime. At the same time, the auxiliary heat drying module transfers heat to the surrounding through the central grinding roller and the edge grinding roller, accelerating the evaporation of the moisture in the moist lime.

[0008] As a preference, the auxiliary heat drying module is a spiral heating pipe. The hollow structure inside the central grinding roller is conical. The spiral heating pipe is installed inside the central grinding roller and abuts against the inner wall of the central grinding roller. The spiral heating pipe is powered by external mains electricity and heats up to 42 - 46 °C. After the spiral heating pipe is energized and heated, it radiates heat to the surrounding to the central grinding roller. As the central grinding roller and the edge grinding roller interact to grind and crush the caked lime, at the same time, the heat on the central grinding roller is transferred to the surrounding lime powder, accelerating the evaporation of the moisture in the lime powder.

[0009] Preferably, the auxiliary heat drying module is a linear heating tube. The hollow structure inside the edge grinding roller is cylindrical. There are three groups of linear heating tubes, which are installed at intervals in three non-adjacent edge grinding rollers. The linear heating tubes are powered by external mains electricity to generate heat up to 42 - 46°C. The central grinding roller is filled with quartz sand filler. After the linear heating tubes are electrified to generate heat, the heat is transferred to the edge grinding roller. As the central grinding roller and the edge grinding roller interact, the caked lime is ground and crushed. At the same time, the heat on the edge grinding roller is transferred to the surrounding lime powder and the quartz sand filler in the central grinding roller. The setting of the quartz sand filler makes the heat dissipation on the central grinding roller slower, with good heat preservation effect, and better accelerates the evaporation of water in the lime powder.

[0010] Preferably, a suspension rod is fixedly connected to the upper end of the pH value measuring machine. The upper end of the suspension rod is fixedly connected with a first clamp. The first clamp is clamped on the through pipe and fixed tightly by bolts. The pH value measuring machine is stably hoisted and fixed on the through pipe through the overall structure composed of the suspension rod and the first clamp, so that the pH value measuring machine extends into the pulp. The probe on the pH value measuring machine detects the pH value of the pulp, and converts the detection result into a signal and sends it to the control units of the control valve and the feeder.

[0011] Preferably, a dispersion hopper is arranged below the feed pipe. The bottom of the dispersion hopper is 15 - 30 cm away from the pulp liquid level. A hemispherical sliding platform is installed in the dispersion hopper through 8 radially arranged rods. The distance between the lower edge of the sliding platform and the inner wall of the dispersion hopper is 5 - 8 cm. The lime material falling from the feed pipe enters the dispersion hopper. The lime powder first falls on the smooth surface of the sliding platform and slides around along its spherical surface. It falls into the flotation tank through the gap between the lower edge of the sliding platform and the inner wall of the dispersion hopper, avoiding the lime powder concentrating at one place and causing the pulp to splash.

[0012] Preferably, a suspension bracket is fixedly connected to the upper end of the dispersion hopper. One end of the suspension bracket is fixedly connected with a second clamp. The second clamp is clamped on the feed pipe and fastened by bolts. The dispersion hopper is stably hoisted and fixed on the feed pipe through the overall structure composed of the suspension bracket and the second clamp, maintaining the relative position stability between the dispersion hopper and the feed pipe.

[0013] Preferably, a buckle ring with an opening at the edge is fixedly connected to one side of the dispersion hopper facing the pH value measuring machine. The buckle ring is a tough stainless steel ring piece. The suspension rod is clamped and fixed in the buckle ring. After the dispersion hopper is installed, the suspension rod is inserted into the buckle ring, and the fixed-position buckle ring is used to further fix the suspension rod, preventing the impact of the floating pulp on the pH value measuring machine and causing it to swing unstably.

[0014] The beneficial effects of the present utility model:

[0015] 1. By providing a crushing mechanism and an auxiliary heat drying module on the hopper of the original pH control device, the damp lime can be ground and crushed while being dried, preventing the lime from getting damp and caking, which may block the conveying channel. Additionally, the moisture in the lime can be further removed, reducing the adverse impact on the precise adjustment of the pulp pH value.

[0016] 2. Through the provision of a dispersion hopper and a material sliding table, the lime fed can be dispersed and buffered during the falling process, preventing the pulp from splashing.

[0017] 3. The buckle on the dispersion hopper can stabilize the suspension rod, reducing the situation where the pulp flow disturbs the pH value measuring machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The three-dimensional structure diagram of the automatic pH control device for flotation pulp of the present utility model is shown;

[0019] Figure 2 The front structure diagram of the automatic pH control device for flotation pulp of the present utility model is shown;

[0020] Figure 3 The three-dimensional structure diagram inside the hopper of the automatic pH control device for flotation pulp of the present utility model is shown;

[0021] Figure 4 The structure diagram of Embodiment 1 of the auxiliary heat drying module of the automatic pH control device for flotation pulp of the present utility model is shown;

[0022] Figure 5 The structure diagram of Embodiment 2 of the auxiliary heat drying module of the automatic pH control device for flotation pulp of the present utility model is shown;

[0023] Figure 6 The three-dimensional structure diagram of the dispersion hopper of the automatic pH control device for flotation pulp of the present utility model is shown;

[0024] Figure 7 The three-dimensional structure diagram of the assembly structure of the dispersion hopper and the feed pipe of the automatic pH control device for flotation pulp of the present utility model is shown;

[0025] Figure 8 The sectional structure diagram of the dispersion hopper of the automatic pH control device for flotation pulp of the present utility model is shown.

[0026] Description of reference numerals in the drawings: 1. Hopper; 2. Connecting pipe; 3. Control valve; 4. Feeder; 5. Feed pipe; 6. pH value measuring machine; 7. Central grinding roller; 8. Edge grinding roller; 10. Dispersion hopper; 11. Sliding material table; 12. First clamp; 13. Suspension rod; 14. Hanger; 15. Second clamp; 16. Snap ring; 901. Spiral heating pipe; 902. Linear heating pipe. Detailed implementation manners

[0027] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0028] Please refer to Figures 1-8 , the present utility model provides an automatic control device for the pH value of flotation pulp, which includes a hopper 1 arranged above the flotation tank, a connecting pipe 2 connected to the discharge port at the lower end of the hopper 1, a control valve 3 installed on one side of the discharge port of the hopper 1, a feeder 4 installed at one end of the connecting pipe 2, the other end of the connecting pipe 2 is connected with a feed pipe 5 extending into the flotation tank, and a pH value measuring machine 6 for detecting the pH value of the pulp and extending into the flotation tank is arranged on one side of the feed pipe 5. The device also includes a crushing mechanism composed of a central grinding roller 7 and an edge grinding roller 8; the feeder 4 is composed of a motor at the end of the connecting pipe 2 and a auger inside the connecting pipe 2, and the motor drives the auger to rotate to convey lime. A hollow table-shaped bracket is fixedly installed in the hopper 1. The central grinding roller 7 is of a conical structure and is arranged at the upper end of the bracket. There are six groups of edge grinding rollers 8 and they are evenly distributed around the outer periphery of the central grinding roller 7 at equal intervals. Dense flanges are arranged on the outer walls of the hollow central grinding roller 7 and the hollow edge grinding roller 8. The central grinding roller 7 and the edge grinding roller 8 are both driven to rotate by motors arranged in the bracket. An auxiliary heat drying module for evaporating the moisture in the lime is arranged in the crushing mechanism. The pH value measuring machine 6 detects the pH value of the pulp, and converts the detected pH value data into an electric signal and sends it to the control valve 3 and the feeder 4. The control valve 3 is activated to open the valve plate in the discharge port of the hopper 1. The lime falls from the hopper 1 into the connecting pipe 2, and the motor in the feeder 4 drives the auger to convey the lime, so that the lime enters the flotation tank from the feed pipe 5 to improve the pH value of the pulp. The opening and closing time of the control valve 3 is calculated by the computer according to the actual pH value of the pulp and the required lime material. During the whole flotation process, the crushing mechanism composed of the central grinding roller 7 and the edge grinding roller 8 continuously grinds and crushes the damp and caked lime. At the same time, the auxiliary heat drying module transfers heat to the surrounding through the central grinding roller 7 and the edge grinding roller 8 to accelerate the evaporation of the moisture in the damp lime.

[0029] Please refer to Figures 1-2 , Figures 6-8, a pH meter 6 is fixedly connected to the upper end of a suspension rod 13, the upper end of the suspension rod 13 is fixedly connected to a first clamp 12, the first clamp 12 is clamped on a through pipe 2 and fixed by bolts. The pH meter 6 is stably hoisted and fixed on the through pipe 2 through the overall structure composed of the suspension rod 13 and the first clamp 12, so that the pH meter 6 extends into the pulp, and the probe on the pH meter 6 detects the pH value of the pulp and sends the detected structural conversion signal to the control units of the control valve 3 and the feeder 4. A dispersion hopper 10 is arranged below the feed pipe 5, the bottom of the dispersion hopper 10 is 15 - 30 cm away from the pulp liquid level. A hemispherical sliding table 11 is installed in the dispersion hopper 10 through 8 radially arranged rods. The distance between the lower edge of the sliding table 11 and the inner wall of the dispersion hopper 10 is 5 - 8 cm. The lime material falling from the feed pipe 5 enters the dispersion hopper 10. The lime powder first falls on the smooth surface of the sliding table 11 and slides around along its spherical surface, and then disperses and falls into the flotation tank through the gap between the lower edge of the sliding table 11 and the inner wall of the dispersion hopper 10, avoiding the lime powder from concentrating at one place and causing the pulp to splash. The upper end of the dispersion hopper 10 is fixedly connected to a suspension bracket 14, one end of the suspension bracket 14 is fixedly connected to a second clamp 15, the second clamp 15 is clamped on the feed pipe 5 and fixed by bolts. The dispersion hopper 10 is stably hoisted and fixed on the feed pipe 5 through the overall structure composed of the suspension bracket 14 and the second clamp 15, maintaining the relative position stability between the dispersion hopper 10 and the feed pipe 5. A buckle ring 16 with an opening at the edge is fixedly connected to the side of the dispersion hopper 10 facing the pH meter 6. The buckle ring 16 is a ductile stainless steel ring piece. The suspension rod 13 is clamped and fixed in the buckle ring 16. After the dispersion hopper 10 is installed, the suspension rod 13 is clamped into the buckle ring 16, and the fixed-position buckle ring 16 is used to further fix the suspension rod 13, preventing the impact of the floating pulp on the pH meter 6 and causing it to swing unstably.

[0030] Example 1: Please refer to Figure 4 , in this embodiment, the auxiliary heat drying module is a spiral heating tube 901. The hollow structure inside the central grinding roller 7 is conical. The spiral heating tube 901 is installed inside the central grinding roller 7 and abuts against the inner wall of the central grinding roller 7. The spiral heating tube 901 is powered by external mains electricity to heat to 42 - 46 °C. After the spiral heating tube 901 is powered on and heated, it radiates heat to the surrounding area onto the central grinding roller 7. As the central grinding roller 7 and the edge grinding roller 8 interact to grind and crush the agglomerated lime, at the same time, the heat on the central grinding roller 7 is transferred to the lime powder around, accelerating the evaporation of the moisture in the lime powder.

[0031] Example 2: Please refer to Figure 5, in this embodiment, the auxiliary heat drying module is a linear heating tube 902. The hollow structure inside the edge grinding roller 8 is cylindrical. There are three groups of linear heating tubes 902, which are installed at intervals in three non-adjacent edge grinding rollers 8. The linear heating tubes 902 are powered by external mains electricity and heat up to 42 - 46 °C. Quartz sand filler is contained in the central grinding roller 7. After the linear heating tubes 902 are electrified and generate heat, the heat is transferred to the edge grinding roller 8. As the central grinding roller 7 and the edge grinding roller 8 interact, the caked lime is ground and crushed. At the same time, the heat on the edge grinding roller 8 is transferred to the surrounding lime powder and the quartz sand filler in the central grinding roller 7. The setting of the quartz sand filler makes the heat dissipation on the central grinding roller 7 slower, with good heat preservation effect, and better accelerates the evaporation of moisture in the lime powder.

[0032] Through the above steps, by setting a crushing mechanism and an auxiliary heat drying module on the hopper 1 in the original pH value control device, the damp lime can be ground and crushed while being dried, avoiding the blockage of the conveying channel caused by the dampening and caking of lime, and further removing the moisture in the lime, reducing the adverse impact on the precise adjustment of the pH value of the pulp, so as to solve the problems that the hopper 1 for adjusting the pH value of the flotation pulp is close to the flotation tank, the internal lime is easily dampened, blocking the feeding channel, and the damp lime blocks affect the precise adjustment of the pH value.

Claims

1. An automatic control device for the pH value of flotation pulp, comprising a hopper (1) arranged above a flotation tank, a through pipe (2) connected to the discharge port at the lower end of the hopper (1), a control valve (3) installed on one side of the discharge port of the hopper (1), a feeder (4) installed at one end of the through pipe (2), an inlet pipe (5) connected to the other end of the through pipe (2) and extending into the flotation tank, and a pH value measuring machine (6) arranged on one side of the inlet pipe (5) and extending into the flotation tank to detect the pH value of the pulp; characterized in that: It also includes a crushing mechanism composed of a central grinding roller (7) and an edge grinding roller (8); the feeder (4) is composed of a motor at the end of the through pipe (2) and a screw conveyor inside the through pipe (2). The motor drives the screw conveyor to rotate and convey lime. A support with a hollow truncated cone structure is fixedly installed in the hopper (1). The central grinding roller (7) is of a conical structure and is arranged at the upper end of the support. There are six groups of edge grinding rollers (8) evenly distributed at equal intervals on one side of the outer circumference of the central grinding roller (7). Dense flanges are arranged on the outer walls of the central grinding roller (7) with a hollow structure and the edge grinding rollers (8) with a hollow structure. Both the central grinding roller (7) and the edge grinding rollers (8) are driven to rotate by motors arranged in the support. A supplementary heat drying module for evaporating the moisture in the lime is arranged in the crushing mechanism.

2. The automatic control device for the pH value of floating beneficiation pulp according to claim 1, characterized in that: The supplementary heat drying module is a spiral heating pipe (901). The internal hollow structure of the central grinding roller (7) is conical. The spiral heating pipe (901) is installed in the central grinding roller (7) and abuts against the inner wall of the central grinding roller (7). The spiral heating pipe (901) is powered by external mains electricity and heats up to 42 - 46 °C.

3. The automatic control device for the pH value of floating beneficiation pulp according to claim 1, characterized in that: The supplementary heat drying module is a linear heating pipe (902). The internal hollow structure of the edge grinding roller (8) is cylindrical. There are three groups of linear heating pipes (902) installed at intervals in three non - adjacent edge grinding rollers (8). The linear heating pipes (902) are powered by external mains electricity and heat up to 42 - 46 °C. Quartz sand filler is filled in the central grinding roller (7).

4. The automatic control device for the pH value of the floating ore pulp according to claim 1, wherein: The upper end of the pH value measuring machine (6) is fixedly connected to a suspension rod (13). The upper end of the suspension rod (13) is fixedly connected to a first clamp (12). The first clamp (12) is clamped on the through pipe (2) and fixed by tightening with bolts.

5. The automatic control device for the pH value of the floating beneficiation pulp according to claim 4, characterized in that: A dispersion hopper (10) is arranged below the feed pipe (5). The bottom of the dispersion hopper (10) is 15 - 30 cm away from the slurry liquid level. A sliding material table (11) with a hemispherical structure is installed in the dispersion hopper (10) through 8 radially arranged rods. The distance between the lower edge of the sliding material table (11) and the inner wall of the dispersion hopper (10) is 5 - 8 cm.

6. The automatic control device for the pH value of floating beneficiation pulp according to claim 5, wherein: The upper end of the dispersion hopper (10) is fixedly connected to a suspension bracket (14). One end of the suspension bracket (14) is fixedly connected to a second clamp (15). The second clamp (15) is clamped on the feed pipe (5) and fastened by bolts.

7. The automatic control device for the pH value of the floating ore pulp according to claim 6, characterized in that: A snap ring (16) with an opening at the edge is fixedly connected to one side of the dispersion hopper (10) facing the pH value measuring machine (6). The snap ring (16) is a tough stainless steel ring piece. The suspension rod (13) is clamped and fixed in the snap ring (16).

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