Screening and separating system for waste residues in ore pulp

Abstract

The utility model relates to the technical field of ore pulp screening equipment, in particular to a system for screening and separating waste residues in ore pulp, which comprises a buffer tank, screening boxes are symmetrically arranged on two sides of the buffer tank, the front end and the rear end of each screening box are solid surfaces, and the other four surfaces are perforated screening surfaces. An ore pulp feeding port, a flushing water inlet and a purging gas inlet are formed in the solid face of one end of the screening box, an opening is formed in the solid face of the other end of the screening box, a gate is installed at the opening, a waste residue collecting chamber is arranged outside the gate, a waste residue channel is connected to the bottom of the waste residue collecting chamber, and a waste residue collecting groove is connected to the bottom of the waste residue channel. According to the screening and separating system for the waste residues in the ore pulp, by adopting the mode that the static screening box is matched with ore pulp liquid level disturbance scouring, the system can achieve efficient screening of the waste residues under the low-energy-consumption condition, compared with a vibration screening technology, the obvious energy efficiency advantage is achieved, noise pollution generated by equipment vibration is avoided, and the service life of the system is prolonged. And compared with a static screening technology, the screening efficiency is also remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ore pulp screening equipment, in particular to a waste slag screening and separation system in ore pulp. Background Art

[0002] During the mining and processing of minerals, plastic, rubber fragments and other large particles are often mixed into the mineral slurry due to various factors such as the use of explosives and the limited precision of the coarse screening in the grinding process. The particle size of these impurities is relatively large, usually between 5 and 20 mm, which is significantly different from the ore particles in the mineral slurry. However, since the density of these impurities (such as plastic or rubber) is between that of water and ore, it is difficult for them to float up in the mineral slurry by buoyancy, so special equipment is needed to separate them.

[0003] At present, there are various methods for separating large-size impurities in ore slurry, including static screening, vibrating screening, drum screening and spiral screening. Although these methods have their own advantages, they also have some obvious limitations and shortcomings. For example, although the static screening technology has a simple equipment structure and low energy consumption, the screening efficiency is low, a large screen area is required, and the cleaning and washing of the residue on the screen will increase the discharge of slag-containing wastewater. The vibrating screening equipment has a compact structure and high efficiency, but it has high energy consumption, high noise, and the complex equipment structure is not easy to maintain. Although the drum screening technology has high efficiency and is easy to operate continuously, it also has the problems of high energy consumption, large drum area, and large workload for impurity cleaning. Although the spiral screening equipment has a compact structure and low energy consumption, the screening efficiency is relatively low, and the sleeve structure is not conducive to the cleaning and maintenance of the screen barrel. Utility Model Content

[0004] The purpose of the utility model is to provide a system for screening and separating waste slag in a slurry, so as to solve the problem that the static screening technology proposed in the above background technology has a simple equipment structure and low energy consumption, but has a low screening efficiency and requires a larger screening area, and the cleaning and flushing of the residue on the screen will increase the discharge of slag-containing wastewater.

[0005] To achieve the above-mentioned purpose, the utility model provides a waste slag screening and separation system in a slurry, comprising a buffer tank, screening boxes are symmetrically arranged on both sides of the buffer tank, the front and rear ends of the screening box are solid surfaces, and the other four surfaces are open screen surfaces, a slurry feed port, a flushing water inlet and a purge gas inlet are arranged on the solid surface of one end of the screening box, the other end of the screening box is open on the solid surface, a gate is installed at the opening, a waste slag collecting chamber is arranged outside the gate, the bottom of the waste slag collecting chamber is connected to a waste slag channel, and the bottom of the waste slag channel is connected to the waste slag collecting tank.

[0006] Preferably, a stirrer is installed inside the buffer tank.

[0007] Preferably, a feed pipe is connected to the outer side of the slurry feed port, and two feed pipes are connected, and a feed port is arranged on the outer side.

[0008] Preferably, a regulating valve is installed on each of the two feed pipes.

[0009] Preferably, the outside of the purge gas inlet is connected to an external high-pressure air pump.

[0010] Preferably, a solid surface of the screening box away from the gate is coplanar with the outer wall of the buffer tank.

[0011] Preferably, a PLC control chip is further included, and a discharge valve is installed at the bottom discharge end of the buffer tank. The PLC control chip controls the opening of the regulating valve and the discharge valve switch, so as to control the slurry level in the buffer tank between the bottom surface of the buffer tank and the slurry feed port, and the surface slurry is used to flush the screen surface, thereby improving the screening efficiency and avoiding clogging of the screen holes.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. In the slurry waste slag screening and separation system, by using a static screening box in combination with the slurry surface disturbance flushing method, this system can achieve efficient screening of waste slag under low energy consumption conditions. Compared with the vibration screening technology, it has obvious energy efficiency advantages and avoids noise pollution caused by equipment vibration. The screening efficiency is also significantly improved compared with the static screening technology. This system adopts a special screening and slag removal combination method, using compressed air to purge the screening box, which not only effectively cleans the screening box, but also recycles the waste slag at the same time, greatly improving the cleaning efficiency and reducing the workload of operators.

[0014] 2. In the slurry waste slag screening and separation system, by using compressed air to blow the screening box and configuring waste slag collection facilities, this system achieves the generation of no slag-containing wastewater, and the water content of the waste slag is also low. After unified collection, it can be sent to the solid waste system for treatment. In view of the easy sedimentation of slurry, this system is equipped with anti-sedimentation and anti-blocking facilities, which effectively avoids the bridging and accumulation of mineral particles in the system, thereby preventing the blockage of equipment and pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the screening box in the utility model;

[0018] Figure 4 For this utility model Figure 2 Schematic diagram of the cross section of AA;

[0019] Figure 5 For this utility model Figure 2 Schematic diagram of the cross section of the middle BB;

[0020] Figure 6 For this utility model Figure 2 Schematic diagram of the cross section of CC.

[0021] The meaning of each number in the figure is:

[0022] 1. Screening box; 11. Solid surface; 12. Perforated screen surface; 13. Slurry feed port; 14. Flushing water inlet; 15. Purge gas inlet; 16. Gate; 2. Buffer tank; 3. Waste slag collection chamber; 4. Waste slag channel; 5. Waste slag collection tank; 6. Feed pipe; 61. Feed port; 62. Regulating valve; 7. Mixer. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] The utility model provides a waste slag screening and separation system in ore slurry, such as Figure 1-Figure 6 As shown, it includes a buffer tank 2, and screening boxes 1 are symmetrically arranged on both sides of the buffer tank 2. The front and rear ends of the screening box 1 are solid surfaces 11, and the other four surfaces are open screen surfaces 12. A slurry feed port 13, a flushing water inlet 14 and a purge air inlet 15 are arranged on the solid surface 11 at one end of the screening box 1. The flushing water inlet 14 is used to pass flushing water to further prevent the mineral particles from bridging and accumulating on the screen surface. Valves are installed on the flushing water inlet 14 and the purge air inlet 15. The solid surface 11 at the other end of the screening box 1 is opened, and a gate 16 is installed at the opening. A waste slag collecting chamber 3 is arranged outside the door 16, and a waste slag channel 4 is connected to the bottom of the waste slag collecting chamber 3, and a waste slag collecting tank 5 is connected to the bottom of the waste slag channel 4. The gate 16 is closed during screening and flushing, and opened during compressed air blowing, so that the waste slag can enter the waste slag collecting chamber 3. After the slurry enters the screening box 1, the screened slurry enters the buffer tank 2 through the sieve holes at the bottom and both sides. When the waste slag trapped in the first screening box 1 accumulates to a certain extent, the slurry screening is switched to another screening box 1 by switching the regulating valve 62, and then the slag is discharged.

[0025] The two screening boxes 1 are used alternately to ensure the continuous operation of the slurry screening. When the waste residue in one screening box 1 is enriched to a certain extent, the slurry is first switched to another screening box 1 for screening, and then the slurry level is adjusted to below the bottom surface of the screening box 1. The flushing water inlet 14 of the screening box 1 is passed through the flushing water inlet 14 to flush the screening box 1, and a small amount of residual mineral particles are recovered. After the cleaning is completed, the valve of the flushing water inlet 14 is closed, the gate 16 of the screening box 1 is opened, and the purge gas inlet 15 is opened to purge the waste residue to the waste residue collection chamber 3, and finally enter the waste residue collection tank 5 through the waste residue channel 4 under the action of gravity for drainage and natural drying. After the waste residue is cleaned, the slurry level is restored to normal, and the waste residue is cleaned with compressed air. No waste liquid is generated in the entire cleaning system. The purging process also has a certain drying effect on the waste residue. The waste residue collection tank 5 is an open tank with a drainage sieve plate at the bottom to further dry the waste residue naturally, effectively reduce the water content of the waste residue, and achieve efficient separation of solid and liquid materials.

[0026] In this embodiment, a stirrer 7 is installed inside the buffer tank 2 to facilitate stirring of the slurry and prevent the slurry from settling to the bottom of the tank during system operation. The bottom outlet end of the buffer tank 2 is set to a three-way structure to facilitate slag cleaning at the outlet.

[0027] Specifically, the outer side of the slurry feed port 13 is connected to a feed pipe 6 , two feed pipes 6 are connected, and an inlet 61 is provided on the outer side to facilitate the input of slurry.

[0028] Furthermore, a regulating valve 62 is installed on each of the two feed pipes 6 to facilitate the feed switch operation of the feed pipe 6 .

[0029] Furthermore, the outside of the purge gas inlet 15 is connected to a high-pressure gas pump to facilitate the introduction of high-pressure gas.

[0030] Furthermore, a solid surface 11 of the screening box 1 away from the gate 16 is coplanar with the outer wall of the buffer tank 2 .

[0031] Furthermore, it also includes a PLC control chip. A discharge valve is installed at the bottom discharge end of the buffer tank 2. The PLC controls the opening of the regulating valve 62 and the switch of the discharge valve to control the slurry level in the buffer tank 2 between the bottom surface of the buffer tank 2 and the slurry feed port 13.

[0032] Specific case 1

[0033] This example was carried out on a pilot plant. The slurry comes from the ball milling process, and the waste residue is mainly plastic, rubber fragments and light fluorosilicate particles, with a particle size range of 5 to 20 mm. The screening system consists of a stainless steel mesh bag and a buffer tank. The stainless steel mesh bag is fixed at the entrance of the slurry for direct screening. The mesh bag aperture is 4 mm. After the slurry is initially screened by the mesh bag, it enters the buffer tank (8m 3) buffer, and then transported to the classification system by a centrifugal pump for classification. The classification system consists of 6 cyclones (3 in operation and 3 in reserve), with a DN150 cyclone specification and a sand nozzle diameter of 8mm. The main indicators for screening effect are the blockage frequency of the sand nozzle of the cyclone and the waste residue interception rate in the slurry.

[0034] The test results show that the frequency of blockage of the grit nozzle of the cyclone is about 16 times / shift (8h) when the net bag is used for screening, and the corresponding waste residue interception rate is about 99.900%. In this comparative example, the grit nozzle needs to be cleaned about once every 30 minutes, which seriously affects the continuous operation of the upstream and downstream processes. It may be that the mesh of the net bag may be misaligned under the action of the slurry scouring, resulting in a small amount of particles larger than 8mm entering the classification system, causing the grit nozzle to be blocked.

[0035] Specific case 2

[0036] This embodiment and Case 1 are operated on the same pilot plant. The slurry indicators and classification system parameters are consistent with those of Case 1. The main difference is that the screening system screening box uses a sieve plate as the screening surface, and the scouring effect of the slurry surface is used to improve the screening efficiency. In addition, a flushing water pipe is configured to regularly flush the accumulated ore in the screening box to ensure continuous operation of the screening system.

[0037] The test results show that in this embodiment, the frequency of blockage of the cyclone sand nozzle is about 1 time / shift (8h), and the corresponding waste residue interception rate is about 99.994%. Compared with Case 1, the blockage frequency of the cyclone sand nozzle is significantly reduced, and the large particles of waste residue in the slurry are thoroughly screened, which can basically ensure the continuous operation of the grading system. In addition, the sieve hole is not blocked during the screening process of this embodiment. The flushing effect of the slurry on the screening box, combined with the flushing water pipe, can effectively avoid the blockage of the sieve hole caused by the bridging of mineral particle deposition during the static screening process.

[0038] Finally, it should be noted that the electronic components of the mixer 7, PLC control chip, etc. in this embodiment are all universal standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods. In the idle space of this device, all the above-mentioned electrical components are connected by wires respectively, and the specific connection means should refer to the working sequence between the electrical components in the above-mentioned working principle to complete the electrical connection, which are all well-known technologies in the art.

[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A system for screening and separating waste residue in a slurry, comprising a buffer tank (2), characterized in that: Screening boxes (1) are symmetrically arranged on both sides of the buffer tank (2); the front and rear ends of the screening box (1) are solid surfaces (11), and the other four surfaces are perforated screening surfaces (12); a slurry feed port (13), a flushing water inlet (14) and a purge gas inlet (15) are arranged on the solid surface (11) at one end of the screening box (1); an opening is arranged on the solid surface (11) at the other end of the screening box (1); a gate (16) is installed at the opening; a waste slag collection chamber (3) is arranged outside the gate (16); the bottom of the waste slag collection chamber (3) is connected to a waste slag channel (4), and the bottom of the waste slag channel (4) is connected to a waste slag collection tank (5).

2. The waste slag screening and separation system in slurry according to claim 1 is characterized in that: A stirrer (7) is installed inside the buffer tank (2).

3. The waste slag screening and separation system in slurry according to claim 1 is characterized in that: The outer side of the slurry feed port (13) is connected to a feed pipe (6), two feed pipes (6) are connected, and a feed inlet (61) is arranged on the outer side.

4. The waste slag screening and separation system in slurry according to claim 3 is characterized in that: A regulating valve (62) is installed on each of the two feed pipes (6).

5. The waste slag screening and separation system in slurry according to claim 1, characterized in that: The outside of the purge gas inlet (15) is connected to an external high-pressure gas pump.

6. The waste slag screening and separation system in slurry according to claim 1, characterized in that: A solid surface (11) of the screening box (1) away from the gate (16) is coplanar with the outer wall of the buffer tank (2).

7. The waste slag screening and separation system in slurry according to claim 1, characterized in that: It also includes a PLC control chip, which controls the opening of the regulating valve (62) to control the slurry level in the buffer tank (2) between the bottom surface of the buffer tank (2) and the slurry feed port (13).

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