CN106000618A - Fluidized vertical screening device - Google Patents

Abstract

A kind of fluidized vertical screening equipment, the ore feeding area of the screening equipment is located on the top of the screening chamber, the screening chamber is placed vertically, one side of the screening chamber is installed with an upright screen, and the other side is The pulsating tympanic membrane is installed, and the pulsating transmission device is connected with the pulsating tympanic membrane through the pulsating transmission shaft, and the pulsating tympanic membrane is driven by the transmission device to generate a certain stroke and horizontal pulsation of strokes, so that the pulp continuously passes back and forth through the screen and is discharged in time. During the separation process, the coarse-grained products on the sieve cannot accumulate on the sieve surface, but directly sink, which fundamentally eliminates the source of the sieve being worn and blocked, and greatly improves the service life of the sieve and the screening efficiency. It also plays the role of cleaning the screen at any time, which fundamentally solves the problem of paste screen. This structure can keep the screen in the best working condition all the time. It is not afraid of high content of coarse grains in the ore feed, no strict requirements on the fineness of the feed ore, and it is not afraid of too much mud and will not stick to the screen.

Description

A fluidized vertical screening equipment

technical field

The invention relates to the field of mineral processing, and is a fluidized vertical screening device.

Background technique

Mining screening equipment is usually used for material classification of 0-300mm. For coarse-grained screening, sieve plate can be used, which is easier to screen and has a long service life. It is widely used in crushing operations in dressing plants. However, after the grinding operation, the screening efficiency of fine and fine particles is not high. The hole is easy to block, especially in the case of high mud content, the mud ball on the sieve is very easy to paste the sieve and make the sieve useless. In addition, the coarse-grained grades on the sieve not only wear the screen wires seriously, but also accumulate on the screen surface and seriously block the fine-grained grades from passing through the screen. Therefore, the screening operation has strict requirements on the fineness of the ore, and the content of coarse grains is not allowed to be high, and the screen must be cleaned every day, which makes the operation and management of the fine screen cumbersome, and the screening efficiency is difficult to stabilize. Many beneficiation plants adopt hydraulic classification because they are unwilling to use fine screens, but hydraulic classification is not classified according to the geometric size of the ore, but according to the sedimentation velocity of the ore particles. The sedimentation velocity is affected by the density of the ore, making the classification particle size inaccurate. , especially when the density difference between ores is very large, the hydraulic classification is very inaccurate, which will cause excessive grinding of heavy minerals in the grinding and grading operation, and will cause the index to drop in the sorting operation.

For the existing fine screening equipment, the most commonly used high-frequency vibrating screen has the best effect. The screen is placed horizontally and forms a small angle with the horizontal plane. After the pulp is fed into the screen, the high-frequency vibration of the screen makes the fine particles The coarse-grained grades are piled on the screen, and under the action of vibration, the table is supported by the screen and gradually slides out of the screen.

The current fine screen mesh material is mainly polyurethane, which is relatively wear-resistant. Although the stainless steel screen has a larger opening rate, its wear resistance is too poor, and its service life is as short as a few days to as long as 15 days. The workload of replacing the screen is heavy, and it needs to be washed every day. Polyurethane sieve, one is a fixed sieve plate with an opening rate of less than 10%, which has been used less and less in recent years. If the sieve size is maintained, its service life is about one month, such as a sieve plate of about 0.15mm . The second is the sieve used on the vibrating screen machine. At present, it is mainly based on the Derek screen and the imitation Derek screen. This application is mostly 0.10-2.0mm sieve holes, of which 0.11-0.18mm sieve The most holes. This type of sieve basically requires the ore particle size to be controlled at more than 60% of -200 mesh, so the service life is long, and the service life of Derek screen can reach half a year or longer. Although the appearance of the imitation Derek screen is the same, the main problem is that the screen holes are easily blocked and the screen permeability becomes poor. Derek screen, if the ore fineness is well controlled, it can achieve a screening efficiency of 60 to 70%, and the screen holes are not easy to block, and the screening efficiency of the imitation Derek screen can also be reached within a certain period of time. More than 40%. However, the price of Derrick screens is very expensive, and the price of each screen (about 0.7m ² ) is close to 10,000 yuan, which is about 2.5 times that of domestic imitation Derrick screens.

Due to the above-mentioned deficiencies of the fine screen equipment, many operations in the mine dressing plant that should be screened and classified are forced to adopt hydraulic classification, such as cyclone, spiral classifier, inclined plate classification, etc. If the fine screen equipment can overcome the above shortcomings, make the screening efficiency high and stable, the screen mesh maintenance is simple, the price is cheap, and even there is no strict requirement on the fineness of the ore, it can be directly used for closed-circuit classification with the mill. The important indicators of the factory have been greatly improved, and its market prospects will be very impressive.

Contents of the invention

Aiming at the deficiencies of traditional mining fine screening equipment, the present invention aims to provide a fluidized vertical screening equipment, which is completely different from conventional screening equipment in terms of structure and principle, during the entire screening process , fundamentally eliminate the source of the screen being worn and blocked, greatly improving the service life and screening efficiency of the screen. The pulsating pulp not only effectively makes the fine-grained grade pass through the screen, but also plays the role of cleaning the screen at any time, which fundamentally solves the problem of paste screen. This structure can keep the screen in the best working condition all the time. It is not afraid of high content of coarse grains in the ore feed, no strict requirements on the fineness of the feed ore, and it is not afraid of too much mud and will not stick to the screen.

The present invention realizes through following technical scheme:

A fluidized vertical screening equipment, including a pulsating transmission device, a pulsating tympanic membrane, a flange, a pulsating transmission shaft, a screening cavity, a screen, a connecting screw, a fine-grained discharge pipe, a spiral sand lifter and the tympanic membrane method Lan, the feeding area of ore pulp is located at the top of the screening chamber, and its characteristic is that: the screening chamber is placed upright, and on the opposite sides of the screening chamber, an upright screen is installed on one side, and an upright screen is installed on the other side The pulsating tympanic membrane is installed, and the pulsating tympanic membrane and the screen are fixedly connected with the screening chamber by the connecting screw; the pulsating transmission device is connected with the pulsating tympanic membrane through the pulsating transmission shaft, and the pulsating tympanic membrane is driven by the transmission device to generate a certain stroke and stroke level Pulsation, the slurry in the screening chamber reciprocates continuously under the action of horizontal pulsation and passes through the screen to enter the fine-grained area, where fine-grained discharge pipes are distributed; the bottom of the screening chamber is connected to the spiral sand lifter superior.

Preferably, the pulsation transmission device is a cam structure, and the other end of the pulsation transmission shaft that transmits power is connected to the pulsation tympanic membrane outside the screening cavity through the tympanic membrane flange.

The stroke of the pulsating transmission shaft is 5 to 30 mm, and the stroke rate is 1 to 5 times per second.

The included angle between the upright screen and the horizontal plane is 90±10°, and the size of the mesh on it is 0.1 to 0.5 mm.

3-50 inverted siphon-type fine-grain discharge pipes are distributed in the fine-grain grade area, and the outlets of each siphon-type fine-grain grade discharge pipes are on the same horizontal plane.

The pulsating tympanic membrane is made of rubber.

Compared with the prior art, the present invention has the following beneficial effects:

1. After the high-frequency vibrating screen slurry is fed to the screen surface, the water quickly leaks through the front end of the screen and takes away some fine-grained grades. The concentration of the slurry in the middle and rear sections of the screen is very high, and the ore particles cannot be well dispersed. , especially when the mud content is high, too little water is easy to paste the sieve and lose the sieving lease. The sieving operation of the present invention is completely carried out in the pulsating pulp of original concentration, the ore particles are well dispersed, the ore slime is well dispersed, and the sieve will not be smeared.

2. Since traditional screens such as high-frequency vibrating screens are placed horizontally, coarse-grained particles on the screen must accumulate on the screen. If the fine-grained particles want to pass through the screen, they will be blocked by these accumulated coarse particles. It will be reduced a lot, resulting in low screening efficiency. Because the sieve of the present invention is placed upright, coarse particles cannot accumulate on the sieve, fine particles can pass through the sieve normally without blocking, and the screening efficiency is high.

3. Since traditional screens such as high-frequency vibrating screens are placed horizontally, coarse-grained particles on the screen must accumulate on the screen, and constantly rub against the screen from the screen head to the tail to cause wear and tear, which greatly reduces the service life of the screen. Because the screen is upright in the present invention, coarse particles that cannot pass through the screen cannot be rubbed and worn with the screen, thereby greatly prolonging the service life of the screen.

4. In order to improve the screening efficiency and prolong the service life of the screen, high-frequency vibrating screen can only screen out most of the coarse particles in the ore in advance, and increase the fineness of the ore to ensure the use effect, which undoubtedly increases process and cost. The sieving equipment proposed by the present invention can save the process of pre-screening coarse particles because it is not affected by coarse particles, and is simple and low in cost.

Description of drawings

Fig. 1 is the schematic diagram of the principle of fluidized vertical screening equipment;

Fig. 2 is the structural representation of fluidized vertical screening equipment;

Fig. 3 is a schematic diagram of direction A-A in Fig. 2;

Fig. 4 is the schematic diagram of the distribution mode of the fine-grained discharge pipe among Fig. 2;

In the figure: 1. Pulsating transmission device, 2. Pulsating tympanic membrane, 3. Flange, 4. Pulsating transmission shaft, 5. Screening cavity, 6. Feeding area, 7. Screen, 8. Connecting screw, 9. Fine Grain grade area, 10, fine grade discharge pipe, 11, spiral sand lifter, 12, tympanic membrane flange.

detailed description

The technical scheme of the present invention is shown in Figures 1-4. The ore pulp enters the screening cavity 5 from the mine supply area 6. The left side of the screening cavity 5 is a pulsating tympanic membrane 2 made of rubber, and the right side is a screen 7. The three pass through several The root connecting screw rod 8 is fixedly connected, detachable and replaceable.

The included angle between the screen 7 and the horizontal plane is 90±10°, and the mesh size of the screen 7 is at most 0.5mm and at least 0.1mm. The pulsation transmission device 1 is designed as a cam structure, which generates reciprocating horizontal pulsation through the pulsation transmission shaft 4. The pulsation transmission shaft 4 is connected with the pulsation tympanic membrane 2 through the tympanic membrane flange 12, and drives the pulsation tympanic membrane 2 to generate reciprocating motion so that the screening chamber 5 The pulp produces pulsation. The stroke of the pulsating transmission shaft 4 is 5 to 30mm, and the stroke frequency is 1 to 5 times per second. During the working process of the equipment, the pulsating pulp in the screening chamber 5 passes through the screen 7 reciprocally, and the pulp carries particles smaller than the sieve through the screen 7 and then enters the fine-grained zone 9, and is discharged from the fine-grained grade. 10 discharge. The fine-grained discharge pipe includes 3-50 inverted siphons, which are distributed at different heights in the fine-grained area 9, but the outlets are at the same level, as shown in Figure 4, so that the pulsating pulp can pass through the screen 7 more evenly, and the entire screen The surface is utilized more evenly, and the purpose of adopting the inverted siphon is to ensure that the ore slurry liquid level in the screening chamber 5 can always submerge the screen 7 to maintain fluidized screening conditions. Coarse particles in the pulsating pulp that are larger than the size of the sieve hole are blocked by the screen 7 and remain in the screening chamber 5, and directly sink to the spiral sand extractor 11 to be discharged.

It can be seen from the principle of Figure 1 that the fine screen is immersed in the pulp and placed upright (while the screen of conventional fine screen equipment is placed horizontally, and the screen is screened in the air through high-frequency vibration, etc. ). The pulp is fed into the device from the top, and the tympanic membrane on the left is driven by the transmission mechanism to generate a certain stroke and pulsation, and the pulp continuously passes through the screen back and forth under the action of the pulsation. The pulsating pulp disperses the ore particles, and the ore particles smaller than the sieve are discharged through the screen in time. The sieve is always in the fluidized slurry, and the coarser particles larger than the sieve are blocked by the sieve and cannot pass through, so they sink directly. Fall and discharge in time. During the whole screening process, because the screen is upright, the so-called "coarse-grained products on the screen" cannot accumulate on the screen surface, but directly sink, which fundamentally eliminates the source of the screen being worn and blocked, and the pulsation The ore slurry not only effectively makes the fine-grained grade pass through the screen, but also plays the role of cleaning the screen at any time, which fundamentally solves the problem of paste screen. This structure can keep the screen in the best working condition all the time. It is not afraid of high content of coarse grains in the ore feed, no strict requirements on the fineness of the ore feed, and it is not afraid of too much mud and will not paste the screen.

Further illustrate the beneficial effect of equipment of the present invention with the example of a comparative test below;

An antimony mine in Yunnan adopts high-frequency vibrating screen, the screen material is stainless steel, the screen hole size is 40 mesh (equivalent to 0.45mm), the ore fineness is about 60% of -200 mesh, the ore concentration is about 20%, and the screening efficiency is 80% , the processing capacity is about 6t/h, the life of the screen is about 15 days, and the screen is cleaned once a day.

Using the fluidized screening equipment of the present invention to carry out comparative tests on the spot, also adopting stainless steel 40 mesh screen mesh, the ore feeding is not pre-screened, the ore fineness -200 mesh is about 33%, the ore concentration is about 31%, and the sieve The separation efficiency is 87%, the processing capacity is about 11t/h, mainly due to the increased weight of the coarse-grained grade, and the service life of the screen is 37 days. It can be seen that with the equipment of the present invention, the screening efficiency and the service life of the screen are still much higher than the conventional high-frequency vibrating screen when the ore fineness is much coarser, which has obvious advantages.

Claims (6)

1. a fluidization vertical screening equipment, including pulsation actuating device (1), pulsation tympanum (2), flange (3), pulsation power transmission shaft (4), screening cavity (5), to mining area (6), screen cloth (7), connect screw rod (8), fine fraction district (9), fine fraction discharge pipe (10), spiral carries sand device (11) and tympanum flange (12), cavity (5) top is sieved in being positioned to mining area (6) of ore pulp, it is characterized in that: described screening cavity (5) stands to be placed, in the both sides that screening cavity (5) is relative, wherein upright screen cloth (7) is installed in side, opposite side installs pulsation tympanum (2), it is connected fixing with screening cavity (5) to pulsation tympanum (2) and screen cloth (7) by connecting screw rod (8)；Described pulsation actuating device (1) is connected by pulsation power transmission shaft (4) and pulsation tympanum (2), pulsation tympanum is driven to produce the level pulsation of certain stroke and jig frequency by actuating device, screening cavity (5) interior ore pulp enters fine fraction district (9) toward redoubling through screen cloth (7) under the effect that level is pulsed the most back and forth, and fine fraction district (9) are distributed fine fraction discharge pipe (10)；Screening cavity (5) bottom is connected to spiral and carries on sand device (11).

A kind of fluidization vertical screening equipment, it is characterized in that: described pulsation actuating device (1) is cam structure, pulsation power transmission shaft (4) other end of its transmission power is connected by the pulsation tympanum (2) of tympanum flange (12) with screening cavity (5) outside.

A kind of fluidization vertical screening equipment, it is characterised in that: the stroke of described pulsation power transmission shaft (4) is 5 to 30mm, and jig frequency is each second 1 to 5 time.

A kind of fluidization vertical screening equipment, it is characterised in that: described upright screen cloth (7) is 90 ± 10 ° with the angle of horizontal plane, and screen size thereon is 0.1 to 0.5mm.

A kind of fluidization vertical screening equipment, it is characterised in that: 3-50 root inverted hydrocone type fine fraction discharge pipe (10) being distributed in fine fraction district (9), each fine fraction discharge pipe (10) exports in same level.

A kind of fluidization vertical screening equipment, it is characterised in that: described pulsation tympanum (2) is quality of rubber materials.