Ore pulp grading device and grading system
By designing a small slurry grading device without extra power, using a curved screen plate for screening, solving the problem of low grading efficiency and difficulty in equipment maintenance of hydraulic rotor in the production of aluminum alumina production, realizing efficient mowing grading and. The stable operation of the equipment.
Patent Information
- Application Number
- CN202421113066.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-05-21
AI Technical Summary
In the production of alumina, existing hydraulic cyclones have problems such as over-grinding and severe over-milling of the grinder, severe fine sand clamping of the cyclone, low grading efficiency, and difficult equipment maintenance. The sand sinker wears quickly and needs to be replaced frequently. , affects production stability.
Design a kind of mowing device, including the feed box and a screening box. The curved screen plate is used for screening. The slurry rolled down through its own gravity overflow. Excess, rough particle grid discharged from the third outlet, further grind. The device does not require additional power. Set the spraying system for easy cleaning the screen and improve the screening effect.
Effectively improve the grading efficiency of the slurry, reduce the frequency of spare parts and labor intensity, reduce the safety risk, improve the grading efficiency of the mill and the overflow minerals, and improve the unit production capacity.
Smart Images
Figure CN222402178U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of alumina production, and in particular relates to a slurry classification device and a classification system. Background Art
[0002] The grading equipment for raw ore pulp of alumina production enterprises basically adopts hydrocyclones. When the hydrocyclone is used as a grading equipment, it is mainly used to form a grinding and grading system with a mill. The hydrocyclone has no moving parts and a simple structure. The upper part of the hydrocyclone is a hollow cylinder, and the lower part is an inverted cone connected to the cylinder. The two form the working cylinder of the hydrocyclone. It is also equipped with a feed pipe, an overflow pipe, an overflow duct and a sand settling port to form a set of sedimentation and grading equipment. When the hydrocyclone is working, the raw ore pulp enters the hydrocyclone along the tangential direction from the feed pipe at a high speed through the cyclone feed pump. Due to the restriction of the outer cylinder wall, the slurry is forced to rotate from top to bottom. This movement is usually called external cyclone or descending cyclone movement. The solid particles in the external vortex flow are subjected to centrifugal force. If the density is greater than the density of the surrounding liquid phase (this is the case in most cases), the centrifugal force it is subjected to will be greater. Once this force is greater than the liquid resistance caused by the movement, the solid particles will overcome this resistance and move toward the wall of the vessel, separating from the suspension. The particles that reach the vicinity of the vessel wall are pushed by the continuous liquid, moving downward along the vessel wall, gathering near the bottom flow outlet to form a thickened suspension slurry, and then discharged from the bottom flow outlet. The slurry (ore slurry with qualified particle size) continues to rotate downward. After entering the conical section, the inner diameter of the separator gradually decreases, and the liquid rotation speed increases. Because the pressure distribution in the radial direction is uneven when the liquid generates eddy current motion, the closer it is to the axis, the smaller it is, and it approaches zero when it reaches the axis, becoming a low-pressure area or even a vacuum area, causing the liquid to move toward the axis. Since the bottom flow outlet of the separator is greatly reduced, the liquid cannot be discharged quickly from the bottom flow outlet, forming an upward rotational motion, and is discharged from the overflow outlet.
[0003] However, in the actual production process, the hydrocyclone has problems such as over-grinding and over-crushing of the mill, serious sand inclusion in the hydrocyclone, low classification efficiency, and difficult equipment maintenance. At the same time, due to the influence of feed concentration, feed particle size, feed pressure, and the influence of material technology, the sand nozzle of the hydrocyclone usually wears out quickly and generally needs to be replaced after a service life of 700-1500 hours. In addition, when the pressure of the feed pump fluctuates greatly, the centrifugal force fluctuation of the slurry in the hydrocyclone cylinder will be greater, causing the sedimentation and separation effect of the slurry to fluctuate, and the amount of fine sand inclusion in the sand nozzle is large, which greatly affects the production capacity of the mill, resulting in high grinding power consumption and low qualified slurry volume, which in turn affects the operation rate and maintenance rate of the mill. In order to ensure the sedimentation and separation effect of the slurry, it is necessary to take time to manually detect the aperture size of the sand nozzle of the hydrocyclone and replace it during the production process. Each shutdown for cooling, inspection and replacement takes at least 4 hours, which greatly affects production control and production stability. Utility Model Content
[0004] In view of the current technical problems, the utility model aims to provide a pulp classification device and a classification system, wherein the pulp classification device can solve the technical problem of low pulp classification efficiency.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A slurry grading device, which has the following structural features: it includes a feed box and a screening box, one end of the screening box is connected to the bottom of the feed box; the feed box is provided with a first feed inlet on the top, and a first discharge port on the bottom, and the discharge port is staggered with the feed inlet; the screening box is provided with a second feed inlet on the top, and a second discharge port and a third discharge port on the bottom, and the second feed inlet is communicated with the first discharge port; an arc-shaped screen plate is provided in the screening box, the second feed inlet and the third discharge port are located above the arc-shaped screen plate, the second discharge port is located below the arc-shaped screen plate, and the bottom of the arc-shaped screen plate protrudes toward the second discharge port.
[0007] During operation, the slurry enters the feed box through the first inlet, and relies on its own gravity to overflow through the first outlet and roll onto the arc-shaped screen plate working surface of the screening box for screening. Qualified fine-grained slurry passes through the sieve holes of the arc-shaped screen plate and is discharged from the second outlet, while coarse-grained slurry is discharged from the third outlet into the mill for further grinding. The slurry grading device of the utility model does not require additional power when the slurry enters, effectively ensures the grading effect, reduces the frequency of spare parts replacement, reduces labor intensity and safety risks, improves the grading efficiency of the mill, and at the same time increases the overflow slurry solid content and unit production capacity.
[0008] Preferably, a protrusion is provided on the inner bottom wall of the feed box, the protrusion is arranged along the width direction of the feed box and abuts against the two side walls of the feed box, and the first feed inlet and the first discharge port are respectively arranged on both sides of the protrusion. The overflow and rolling speed of the slurry can be effectively controlled by providing the protrusion. After the slurry enters the feed box through the first feed inlet, it must overflow the protrusion before overflowing from the first discharge port and rolling into the screening box.
[0009] Preferably, the longitudinal section of the arc-shaped sieve plate is an arc shape, and the central angle of the arc shape is 30° to 60°.
[0010] Preferably, the height of the arc-shaped screen plate is 2.0 m to 2.6 m.
[0011] Preferably, the screening box is provided with a spray system, the spray head of which penetrates the side wall of the screening box and faces the upper surface of the arc-shaped screen plate. By providing the spray system, it is convenient to clean the surface of the screen plate, flush out the blockages and scars in the screen holes, improve the screening effect and reduce manpower maintenance.
[0012] Based on the same inventive concept, the utility model also provides a slurry classification system, including a mill, a slurry tank and the slurry classification device as described above, wherein the third discharge port is connected to the feed pipe of the mill, and the second discharge port is connected to the feed pipe of the slurry tank.
[0013] Preferably, the slurry classifying device is provided in plurality, and the bottoms of the screening boxes in the plurality of slurry classifying devices are abutted against each other; the plurality of the third discharge ports are arranged opposite to each other and are all connected to the feed pipe of the mill, and the plurality of the second discharge ports are all connected to the feed pipe of the slurry tank. By providing a plurality of classifying devices, sufficient screening area can be provided.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The slurry classifying device and classifying system of the utility model do not require additional power when the slurry enters the classifying device, which effectively ensures the classification effect, reduces the frequency of spare parts replacement, reduces labor intensity and safety risks, improves the classification efficiency of the mill, and at the same time improves the overflow slurry solid content and unit production capacity.
[0016] 2. The slurry grading device and grading system of the utility model, by setting up a spray system, is convenient for cleaning the surface of the screen plate, and the blockages and scars in the screen holes are washed away, thereby improving the screening effect and reducing the manpower maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the structure of the slurry classification device in Example 1 of the utility model;
[0018] Figure 2 for Figure 1 Schematic diagram of the structure of the middle feed box;
[0019] Figure 3 for Figure 1 Schematic diagram of the structure of the middle screening box;
[0020] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure;
[0021] Figure 5 This is a schematic diagram of the structure of the slurry classification system in Example 2 of the utility model;
[0022] In the figure:
[0023] 1-feed box; 2-screening box; 3-first feed port; 4-first discharge port; 5-second feed port; 6-second discharge port; 7-arc screen plate; 8-bump; 9-third discharge port; 10-spraying system. DETAILED DESCRIPTION
[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following text, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.
[0025] Example 1
[0026] like Figure 1 As shown, a slurry classification device provided in this embodiment includes a feed box 1 and a screening box 2, one end of the screening box 2 is connected to the bottom of the feed box 1. Figure 2 As shown, the top of the feed box 1 is provided with a first feed inlet 3, and the bottom is provided with a first discharge port 4, which is staggered with the feed inlet 3. A convex block 8 is provided on the inner bottom wall of the feed box 1, and the convex block 8 is arranged along the width direction of the feed box 1 and abuts against the front and rear side walls of the feed box 1. The first feed inlet 3 and the first discharge port 4 are respectively arranged on both sides of the convex block 8. Figure 1 and Figure 3 As shown, the screening box 2 is provided with a second feed port 5 at the top, and a second discharge port 6 and a third discharge port 9 at the bottom, and the second feed port 5 is communicated with the first discharge port 4. An arc-shaped sieve plate 7 is provided in the screening box 2, and the upper surface of the arc-shaped sieve plate 7 is connected to the bottom of the feed box 1. The second feed port 5 and the third discharge port 9 are located above the arc-shaped sieve plate 7, and the second discharge port 6 is located below the arc-shaped sieve plate 7, and the bottom of the arc-shaped sieve plate 7 protrudes toward the second discharge port 6. The shell of the arc-shaped sieve plate 7 is made of low-carbon steel material, and the screen surface is made of 304 stainless steel (standard) material. The sieve plate type is metal wire material, and the sieve hole is 1.5-2 times the controlled particle size of the slurry. The longitudinal section shape of the arc-shaped sieve plate 7 is an arc, and the central angle of the arc is 45°. The radius of the arc-shaped sieve plate 7 is 2036 mm, and the overall height of the grading device is 3.0 m. As shown Figure 4 As shown, a spray system 10 is provided on the screening box 2 , and a spray head of the spray system 10 penetrates the side wall of the screening box 2 and faces the upper surface of the arc-shaped screen plate 7 .
[0027] A pulp classification system includes a mill, a pulp tank and the pulp classification device as described above, wherein the third discharge port 9 is connected to the feed pipe of the ball mill, the second discharge port 6 is connected to the feed pipe of the pulp tank, and the original feed pump and pipeline are used.
[0028] When working, the slurry separation device of this embodiment is a simple, efficient, DSM static non-powered ore dressing and screening device. The slurry enters the feed box 1 through the feed pump, passes through the buffer overflow of the bottom of the feed box 1 and the bump, and rolls down from the first discharge port 4 by its own gravity to the working surface of the arc screen plate 7 for screening. The qualified fine-grained slurry flows out from the second discharge port 6 and enters the slurry tank. The unqualified slurry is discharged from the third discharge port 9 and returned to the ball mill for further grinding. After shutdown, the circulating alkali solution is introduced into the spray system 10 to clean the screen surface, so that the blockages and scars in the screen holes of the arc screen plate 7 are washed clean as much as possible, so as to improve the regeneration effect of the screening area.
[0029] Example 2
[0030] The slurry separation device in this embodiment is the same as that in embodiment 1. Figure 5 As shown, the pulp classification system of this embodiment includes a mill, a pulp tank and two pulp classification devices, the arc-shaped screen plates 7 in the two pulp classification devices are arranged opposite to each other, and the bottoms of the screening boxes 2 are abutted. The two third discharge ports 9 are both connected to the feed pipe of the ball mill, and the two second discharge ports 6 are both connected to the feed pipe of the pulp tank, and the original feed pump and pipeline are used.
[0031] The slurry classification system of this embodiment was used to carry out four groups of slurry classification experiments. The experimental conditions and experimental results are as follows:
[0032] Experiment 1: The mill discharge is 100t / h, and the circulating mother liquor for preparing slurry is 330m 3 / h, after the slurry is prepared, it enters the classification device for processing, and the fine-particle slurry discharged from the second discharge port 6 is analyzed to obtain: the content of -63μm in the slurry under the left curved sieve plate 7 is 80.7%, the content of -150μm in the slurry under the sieve is 95.6%, and the solid content is 329g / l; the content of -63μm in the slurry under the right curved sieve plate 7 is 81.8%, the content of -150μm in the slurry under the sieve is 95.3%, and the solid content is 335g / l.
[0033] Experiment 2: The mill discharge is 95t / h, and the circulating mother liquor for preparing slurry is 310m 3 / h, after the slurry is prepared, it enters the classification device for treatment, and the fine-particle slurry discharged from the second discharge port 6 is analyzed and it is found that: the content of -63μm in the slurry under the left curved sieve plate 7 is 76.3%, the content of -150μm in the slurry under the sieve is 94.3%, and the solid content is 302g / l; the content of -63μm in the slurry under the right curved sieve plate 7 is 79.5%, the content of -150μm in the slurry under the sieve is 97.1%, and the solid content is 295g / l.
[0034] Experiment 3: The mill discharge is 95t / h, and the circulating mother liquor for preparing slurry is 200m3 / h, after the slurry is prepared, it enters the classification device for treatment, and the fine-particle slurry discharged from the second discharge port 6 is analyzed, and it is found that: the content of -63μm in the slurry under the left curved sieve plate 7 is 75.5%, the content of -150μm in the slurry under the sieve is 96.1%, and the solid content is 342g / l; the content of -63μm in the slurry under the right curved sieve plate 7 is 79.7%, the content of -150μm in the slurry under the sieve is 94.3%, and the solid content is 343g / l.
[0035] Experiment 4: The mill discharge is 87t / h, and the circulating mother liquor for preparing slurry is 280m 3 / h, after the slurry is prepared, it enters the classification device for processing, and the fine-particle slurry discharged from the second discharge port 6 is analyzed, and it is found that: the content of -63μm in the slurry under the left curved sieve plate 7 is 78.7%, the content of -150μm in the slurry under the sieve is 95.6%, and the solid content is 339g / l; the content of -63μm in the slurry under the right curved sieve plate 7 is 80.8%, the content of -150μm in the slurry under the sieve is 97.4%, and the solid content is 275g / l.
[0036] The slurry classification device and classification system of the present embodiment are characterized by simple operation and low labor intensity, and can effectively avoid production process accidents caused by coarsening of the slurry due to faults such as enlargement of the sand settling nozzle and blockage during the production process. The fine content ratio of the reflux slurry is greatly reduced, and the solid content of the qualified slurry is effectively improved, while the relative dissolution rate is not affected.
[0037] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the embodiments by those skilled in the art fall within the scope defined by the claims attached to the present invention.
Claims
1. A slurry classification device, characterized in that: It comprises a feed box (1) and a screening box (2), one end of the screening box (2) is connected to the bottom of the feed box (1); The feed box (1) is provided with a first feed inlet (3) at the top and a first discharge outlet (4) at the bottom, and the discharge outlet (4) is staggered with the feed inlet (3); The screening box (2) is provided with a second material inlet (5) at the top, and a second material outlet (6) and a third material outlet (9) at the bottom, wherein the second material inlet (5) is connected to the first material outlet (4); The screening box (2) is provided with an arc-shaped sieve plate (7), the second feed port (5) and the third discharge port (9) are located above the arc-shaped sieve plate (7), the second discharge port (6) is located below the arc-shaped sieve plate (7), and the bottom of the arc-shaped sieve plate (7) protrudes toward the second discharge port (6).
2. The slurry classification device according to claim 1, characterized in that: A protrusion (8) is provided on the inner bottom wall of the feed box (1), and the protrusion (8) is arranged along the width direction of the feed box (1) and abuts against the two side walls of the feed box (1), and the first feed inlet (3) and the first discharge outlet (4) are respectively arranged on both sides of the protrusion (8).
3. The slurry classification device according to claim 1, characterized in that: The longitudinal cross-section of the arc-shaped sieve plate (7) is in the shape of an arc, and the central angle of the arc is 30° to 60°.
4. The slurry classification device according to claim 3, characterized in that: The height of the arc-shaped screen plate (7) is 2.0 m to 2.6 m.
5. The slurry classification device according to claim 1, characterized in that: The screening box (2) is provided with a spray system (10), and a spray head of the spray system (10) penetrates the side wall of the screening box (2) and faces the upper surface of the arc-shaped screening plate (7).
6. A pulp classification system, comprising a mill and a pulp tank, characterized in that: It also comprises a pulp classification device as claimed in any one of claims 1 to 5, wherein the third discharge port (9) is connected to a feed pipe of a mill, and the second discharge port (6) is connected to a feed pipe of a pulp tank.
7. The slurry classification system according to claim 6, characterized in that: The slurry classifying devices are provided in plurality, and the bottoms of the screening boxes (2) in the plurality of slurry classifying devices are abutted against each other; the plurality of third discharge ports (9) are arranged relatively to each other and are all connected to the feed pipe of the mill, and the plurality of second discharge ports (6) are all connected to the feed pipe of the slurry tank.