An improved short-circuit circulation system for reverse flotation water of collophanite

Abstract

The present invention discloses an improved short-circuit recycling system for backwater in the flotation of collophanite, which relates to the technical field of collophanite flotation. The system includes a high-level water tank, a mill, a reverse flotation device, a scavenging device, a first thickener, and a backwater tank that are connected in series by gravity flow. The scavenging device is connected to a hydrocyclone through a slurry pump. The overflow port of the hydrocyclone is connected to the feed port of the mill through a gravity flow pipe. The underflow port of the hydrocyclone is connected to a reprocessing process. The underflow port of the first thickener is connected to a tailings storage tank. The concentrate outlet of the reverse flotation device is connected to a second thickener and a backwater tank in series by gravity flow. The backwater tank is connected to the high-level water tank through a high-pressure pump. The underflow port of the second thickener is connected to a concentrate storage tank. The overflow of the hydrocyclone is introduced into the mill as makeup water through a gravity flow pipe. The collophanite in the overflow re-enters the grinding and flotation process, reducing phosphorus loss, increasing phosphorus recovery, and reducing the tailings discharge. The recycling and reuse of the hydrocyclone overflow are achieved by gravity flow, shortening the recycling process of the backwater and effectively saving electric energy.

Description

Technical Field

[0001] The present invention relates to the technical field of collophanite flotation, and particularly to an improved short-circuit recycling system for collophanite flotation return water. Background Art

[0002] Collophanite is enriched with phosphorus through single reverse flotation to obtain phosphorus concentrate for subsequent production and processing. Water is used in each technological process during the flotation process. To save energy and reduce energy consumption, a high-level water tank is set at a higher position during the construction of the factory, and the clear water in the high-level water tank flows by gravity to each water-using point. The specific process is as Figure 1 shown. The water in the high-level water tank flows by gravity to the mill. After the collophanite is ground by the mill, it enters the reverse flotation. The bottom-stream concentrate enters the thickener and is concentrated. The bottom-stream phosphorus concentrate enters the concentrate storage tank, and the overflow water enters the return water tank. The reverse flotation foam flows by itself into the scavenging tank. After scavenging, the foam tailings enter the thickener. After concentration, the bottom-stream tailings enter the tailing pond, and the overflow water enters the return water tank. The water in the return water tank is basically clear water, which is pumped into the high-level water tank by a high-pressure pump for recycling. The concentrate in the scavenging tank is pumped into a hydrocyclone for classification. The bottom stream enters the next treatment link, and the overflow water flows by gravity into the thickener and is concentrated together with the scavenging tailings. The hydrocyclone requires the two-phase mixed liquid to be separated to enter at a certain pressure, and a pump is used to achieve the purpose of boosting pressure during the production process. In a flotation system with an annual output of 2.8 million tons of concentrate in a certain factory in Yunnan, the overflow flow rate of the hydrocyclone is 400 m 3 / h, and the solid content is about 3%. This part of the overflow water flows by gravity into the thickener, and after entering the return water tank, it is pumped into the high-level water tank by a high-pressure pump for reuse.

[0003] The following problems exist in the above process: 1. The overflow of the hydrocyclone contains some phosphorus concentrate, and directly entering the thickener will cause phosphorus loss; 2. The overflow flow rate is large, and the energy consumption for pumping back is high. After entering the return water tank and then being pumped into the high-level water tank by a high-pressure pump, since the return water tank is generally located at the lowest position in the flotation plant, and the height difference from the high-level water tank is about 100 meters, the power consumption for transporting the return water is relatively large. Summary of the Invention

[0004] The purpose of the present invention is to provide an improved short-circuit recycling system for collophanite flotation return water to solve the problems of high energy consumption and phosphorus loss in the existing recycling system.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions: An improved short-circuit circulating system for reverse flotation return water of collophanite, characterized in that it includes a high-level water tank, a grinding device, a reverse flotation device, a scavenging device, a first thickener and a return water tank connected in series by gravity flow. The scavenging device is connected to a hydrocyclone through a pulp pump. The overflow port of the classification hydrocyclone is connected to the feed port of the grinding device through a gravity flow pipe. The underflow port of the classification hydrocyclone is connected to a reprocessing process. The underflow port of the first thickener is connected to a tailings storage tank. The concentrate outlet of the reverse flotation device is connected to a second thickener and a return water tank in series by gravity flow. The return water tank is connected to the high-level water tank through a high-pressure pump. The underflow port of the second thickener is connected to a concentrate storage tank.

[0006] A further technical solution is that the height difference between the overflow port of the classification hydrocyclone and the feed port of the grinding device is 10 to 20 meters.

[0007] A further technical solution is that one end of the gravity flow pipe is provided with a valve, and the other end is provided with a flow meter.

[0008] A further technical solution is that a buffer pipe is provided in the middle of the gravity flow pipe, and the diameter of the buffer pipe is 2 to 5 times that of the gravity flow pipe.

[0009] A further technical solution is that liquid level sensors are provided in both the high-level water tank and the return water tank.

[0010] A further technical solution is that the grinding device is composed of a first-stage mill, a first-stage pump sump, a first sand pump, a first-stage hydrocyclone, a second-stage pump sump, a second sand pump, a second-stage hydrocyclone, and a second-stage mill connected in sequence. The underflow port of the first-stage hydrocyclone is connected to the feed port of the first-stage mill. The overflow port of the first-stage hydrocyclone is connected to the second-stage pump sump. The underflow port of the second-stage hydrocyclone is connected to the feed port of the second-stage mill. The discharge port of the second-stage mill is connected to the second-stage pump sump. The overflow port of the second-stage hydrocyclone is connected to the feed port of the reverse flotation device. The overflow port of the classification hydrocyclone is connected to the feed port of the second-stage pump sump through a gravity flow pipe.

[0011] Working principle: The preliminarily crushed collophanite is fed into the grinding device. The water from the high-level water tank and the overflow water of the classification hydrocyclone are used as grinding water and makeup water. After the grinding is qualified, it enters the reverse flotation device for reverse flotation. The concentrate from the reverse flotation is concentrated by the second thickener, and the obtained phosphate concentrate is transported to the concentrate storage tank for storage. The foam enters the scavenging device as tailings for scavenging. The foam tailings after scavenging are sent to the first thickener for concentration, and the obtained tailings are transported to the tailings storage tank or tailings pond for storage as final tailings. The concentrate in the tank is pumped into the hydrocyclone for classification. The underflow concentrate enters the next processing link, and the overflow is used as makeup water for the grinding device through the gravity flow pipe. The overflows of the first thickener and the second thickener flow into the return water tank by gravity and are then sent into the high-level water tank through a high-pressure pump for recycling.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: An improved short-circuit recycling system for the backwater of collophanite flotation with a simple structure and convenient operation is provided. The overflow of the hydrocyclone is introduced into the grinding device through a gravity pipe as makeup water, and the collophanite in the overflow re-enters the grinding and flotation process, greatly reducing phosphorus loss, increasing phosphorus recovery, reducing the tailings discharge amount, and protecting the environment. At the same time, the steps of the overflow of the cyclone flowing by gravity to the first thickener, entering the backwater tank and then being pumped into the elevated water tank by a high-pressure pump are omitted. The recycling of the cyclone overflow can be achieved by gravity, greatly shortening the recycling process of the backwater, effectively saving electric energy, improving the resource utilization efficiency, and enhancing the ore dressing level and economic benefits of the flotation plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a flow chart of the prior flotation.

[0014] Figure 2 FIG. is a structural principle block diagram of the present invention.

[0015] Figure 3 FIG. is a structural schematic diagram of the gravity pipe in the present invention.

[0016] Figure 4 FIG. is a flow chart of the present invention.

[0017] Figure 5 FIG. is a structural principle block diagram of the grinding device in the present invention.

[0018] In the figure: 1 - elevated water tank, 2 - grinding device, 3 - reverse flotation device, 4 - scavenging device, 5 - first thickener, 6 - backwater tank, 7 - pulp pump, 8 - hydrocyclone, 9 - gravity pipe, 10 - second thickener, 11 - high-pressure pump, 12 - valve, 13 - flowmeter, 14 - buffer pipe, 201 - first-stage grinding mill, 202 - first-stage pump sump, 203 - first sand pump, 204 - first-stage hydrocyclone, 205 - second-stage pump sump, 206 - second sand pump, 207 - second-stage hydrocyclone, 208 - second-stage grinding mill. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] Figure 2An improved short-circuit circulating system for reverse flotation return water of collophanite is shown, which includes a high-level water tank 1, a grinding device 2, a reverse flotation device 3, a scavenging device 4, a first thickener 5 and a return water tank 6 connected in series by gravity flow. The scavenging device 4 is connected to a hydrocyclone 8 through a slurry pump 7. The overflow port of the hydrocyclone 8 is connected to the feed port of the grinding device 2 through a gravity flow pipe 9. The underflow port of the hydrocyclone 8 is connected to a reprocessing process. The underflow port of the first thickener 5 is connected to a tailings storage tank. The concentrate outlet of the reverse flotation device 3 is connected in series by gravity flow to a second thickener 10 and a return water tank 6. The return water tank 6 is connected to the high-level water tank 1 through a high-pressure pump 11. The underflow port of the second thickener 10 is connected to a concentrate storage tank. During the construction of the factory, the height difference between the high-level water tank 1 and the return water tank 6 is about 100 meters. To ensure the gravity flow power of water, the height difference between the high-level water tank 1 and the grinding device 2 is about 60 meters, which is convenient for the water in the high-level water tank 1 to flow by gravity to each water replenishing point. To enable the overflow with a certain pressure in the hydrocyclone 8 to flow by gravity into the grinding device, the height difference between the overflow port of the hydrocyclone 8 and the feed port of the grinding device 2 is 10 - 20 meters. The height difference between the hydrocyclone 8 and the grinding device 2 can be achieved by the installation of the hydrocyclone 8. Usually, the height of the hydrocyclone 8 is about 12 meters. When installing, the height of its bottom mounting frame can be fabricated and installed according to actual needs.

[0021] As Figure 4 shown, during use, the preliminarily crushed collophanite is fed into the grinding device 2, and the water overflowing from the high-level water tank 1 and the hydrocyclone 8 is used as grinding water addition and water replenishment. After the grinding is qualified, it enters the reverse flotation device 3 for reverse flotation. The reverse flotation concentrate is concentrated by the second thickener 10, and the obtained phosphate concentrate is transported to the concentrate storage tank for storage. The foam enters the scavenging device 4 as tailings for scavenging. The foam tailings after scavenging are sent to the first thickener 5 for concentration, and the obtained tailings are transported to the tailings storage tank or tailings pond for storage as final tailings. The concentrate in the tank is pumped into the hydrocyclone 8 for classification, and the underflow concentrate enters the next process for treatment. The overflow is used as water replenishment for the grinding device through the gravity flow pipe 9. The overflows of the first thickener 5 and the second thickener 10 flow by gravity into the return water tank 6, and then are sent into the high-level water tank 6 through a high-pressure pump for recycling.

[0022] To facilitate the control of the amount of return water entering the grinding device 2, as Figure 3 shown, one end of the gravity flow pipe 9 is provided with a valve 12, and the other end is provided with a flowmeter 13. The total amount of return water entering the grinding device 2 is controlled through the valve 12 and the flowmeter 13 to ensure the stability of the total amount of water replenishment. To further stabilize the water replenishment pressure and control the flow rate, a buffer pipe 14 is arranged in the middle of the gravity flow pipe 9. The diameter of the buffer pipe 14 is 2 - 5 times that of the gravity flow pipe 9, and the excessive overflow water can be temporarily stored in the buffer pipe 14.

[0023] Level sensors are installed in both the elevated water tank 1 and the return water tank 6. When the water storage in the elevated water tank 1 is insufficient, it can be supplemented by the return water tank 6 and external clean water. When the water level in the return water tank 6 is too high, it can be pumped into the elevated water tank 1 for storage.

[0024] To further improve the grinding efficiency and effect, as Figure 5 shown, the grinding device 2 is composed of a first-stage mill 201, a first-stage pump pool 202, a first sand pump 203, a first-stage cyclone 204, a second-stage pump pool 205, a second sand pump 206, a second-stage cyclone 207, and a second-stage mill 208 connected in sequence. The underflow port of the first-stage cyclone 204 is connected to the feed port of the first-stage mill 201, the overflow port of the first-stage cyclone 204 is connected to the second-stage pump pool 205, the underflow port of the second-stage cyclone 207 is connected to the feed port of the second-stage mill 208, the discharge port of the second-stage mill 208 is connected to the second-stage pump pool 205, the overflow port of the second-stage cyclone 207 is connected to the feed port of the reverse flotation device 3, and the overflow port of the classification cyclone 8 is connected to the feed port of the second-stage pump pool 205.

[0025] During use, the ore after preliminary crushing enters the first-stage mill 201 for grinding at a rate of about 220 t / h while adding about 60 m 3 / h of water. The ground pulp enters the first-stage pump pool and adds 180 - 200 m 3 / h of water. After stirring evenly, it is pumped into the first-stage cyclone 204 for classification by the first sand pump 203. The underflow sand after classification returns to the first-stage mill 201 for circulating grinding, and the overflow enters the second-stage pump pool 205 while adding 270 - 300 m 3 / h of water. Then it is pumped into the second-stage cyclone 207 for classification by the second sand pump 206. The classified sand enters the second-stage mill 208 for grinding and then enters the second-stage pump pool 205. The classified overflow enters the stirring tank of the reverse flotation device 3, and 16 - 22 kg / t of regulator and 1 - 3 kg / t of inhibitor are added in the first-stage stirring tank. After stirring, it enters the second-stage stirring tank, 2 - 5 kg / t of collector is added in the second-stage stirring tank and stirred evenly before entering the flotation operation. The overflow water of the classification cyclone 8 enters the second-stage pump pool 205 through the gravity flow pipe 9 to meet its water addition and make-up water requirements. At the same time, the phosphorus concentrate particles in the overflow water directly enter the second-stage cyclone 207 and enter the flotation directly after classification without entering the mill for re-grinding. The introduction of the overflow water has no impact on the previous flotation process. Generally, multiple production lines are arranged in parallel for flotation, and the overflow water is used for multiple production lines.

[0026] In the above-mentioned flotation system with an annual output of 2.8 million tons of concentrate, the overflow flow rate of the cyclone is about 400 m 3 / h, the motor power of the high-pressure pump is 900 kw, and the rated flow rate is 1120 m 3 / h, with an efficiency of 85%. By recycling and reusing in the self-flow mode in this application, the power consumption can be saved by 400÷1120÷0.85×900 = 378 kw·h per hour, and 3.2672 million kw·h per year. Additionally, 57,300 tons of phosphate concentrate in the overflow of the classifier cyclone 8 can be recovered.

[0027] Although the present invention has been described herein with reference to various illustrative embodiments thereof, it should be understood that those skilled in the art can devise many other modifications and embodiments that will fall within the scope of the principles of this application and the spirit thereof. More specifically, within the scope of this application's disclosure, the drawings, and the claims, various variations and improvements can be made to the components and / or the layout. In addition to the variations and improvements to the components and / or the layout, other uses will also be apparent to those skilled in the art.

Claims

1. An improved short-circuit circulation system for reverse flotation return water of collophanite, which is characterized in that: It includes a high-level water tank (1), a grinding device (2), a reverse flotation device (3), a scavenging device (4), a first thickener (5) and a return water tank (6) connected in series by gravity flow. The scavenging device (4) is connected to a hydrocyclone (8) through a slurry pump (7). The overflow port of the hydrocyclone (8) is connected to the feed port of the grinding device (2) through a gravity flow pipe (9). The underflow port of the hydrocyclone (8) is connected to a reprocessing process. The underflow port of the first thickener (5) is connected to a tailings storage tank. The concentrate outlet of the reverse flotation device (3) is connected in series by gravity flow to a second thickener (10) and a return water tank (6). The return water tank (6) is connected to the high-level water tank (1) through a high-pressure pump (11). The underflow port of the second thickener (10) is connected to a concentrate storage tank. The height difference between the overflow port of the hydrocyclone (8) and the feed port of the grinding device (2) is 10 - 20 meters. The grinding device (2) is composed of a first-stage mill (201), a first-stage pump sump (202), a first sand pump (203), a first-stage hydrocyclone (204), a second-stage pump sump (205), a second sand pump (206), a second-stage hydrocyclone (207), and a second-stage mill (208) connected in sequence. The underflow port of the first-stage hydrocyclone (204) is connected to the feed port of the first-stage mill (201). The overflow port of the first-stage hydrocyclone (204) is connected to the second-stage pump sump (205). The underflow port of the second-stage hydrocyclone (207) is connected to the feed port of the second-stage mill (208). The discharge port of the second-stage mill (208) is connected to the second-stage pump sump (205). The overflow port of the second-stage hydrocyclone (207) is connected to the feed port of the reverse flotation device (3). The overflow port of the hydrocyclone (8) is connected to the feed port of the second-stage pump sump (205) through a gravity flow pipe (9).

2. The improved short-circuit circulation system for reverse flotation return water of collophanite according to claim 1, which is characterized in that: One end of the gravity flow pipe (9) is provided with a valve (12), and the other end is provided with a flow meter (13).

3. The improved short-circuit circulation system for reverse flotation return water of collophanite according to claim 1, which is characterized in that: A buffer pipe (14) is arranged in the middle of the gravity flow pipe (9), and the diameter of the buffer pipe (14) is 2 - 5 times that of the gravity flow pipe (9).

4. The improved short-circuit circulation system for reverse flotation return water of collophanite according to claim 1, which is characterized in that: Liquid level sensors are arranged in both the high-level water tank (1) and the return water tank (6).

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