• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    U I T T R E K S E L The invention illustrates a wet sieving apparatus and a short flow graphite ore purification process through wet sieving. The purification process includes the following steps: after using a smaller number of multi-stage grinding and flotation, the coarse grains obtained by sieving are directly qualified as concentrates; the obtained fine-grained graphite ore is subjected to the short process of regrinding in the next mill and flotation again in the flotation machine, which can shorten the graphite ore separation process, protect the large flake graphite, and improve the quality of the overall graphite; the wet sieving device adopts longitudinal sieve mesh, and the pulsating rubber drumhead realizes pulsating slurry feeding, which effectively solves the problem of graphite easily deposited and overlapped l5 to form "false large pieces" and prevent the sieve mesh during horizontal sieving blocking, and improves the separation index, and reduces energy consumption and costs.
    公开号:NL2027855A
    申请号:NL2027855
    申请日:2021-03-29
    公开日:2021-10-25
    发明作者:He Xiangliang；Gao Huimin；Ma Junhui；Ren Zijie；Zhou Xianwu
    申请人:Univ Wuhan Tech；
    IPC主号:
    专利说明:

    DEVICE FOR WET SIEVE AND SHORT CURRENT PURIFICATION FROM GRAPHIETERTS BY NAT SEVEN
    FIELD OF THE DISCLOSURE The disclosure relates to a wet sieving and short flow cleaning process of graphite ore through wet sieving.
    BACKGROUND The graphite has stable chemical properties, is corrosion resistant and does not react quickly with chemicals such as acids and alkalis. It can be used in the fields of electrodes, dry batteries, antiwear agents, lubricants, crucibles, heat exchangers, coolers, etc. The graphite flakes are shaped like fish scales and belong to the hexagonal crystal system with layered structure. The larger the scale, the higher the value. Due to the scarcity of large sources of flake graphite, every effort must be made to protect the large flakes from damage during the purification process.
    In the purification of graphite ore, the process of multi-stage grinding and flotation is generally used. In order to protect the large graphite flakes and obtain high-quality graphite concentrate, the number of milling and refloating in industry is often more than ten times greater. After the concentrate has dried, the large and small flakes are sieved dry. This process is too long and complex. In recent years, studies have shown that some large graphite flakes and smaller flakes are predissociated during the flotation process, and the quality has reached the product requirements. Due to the inability to efficiently separate this portion of large flake graphite when wet, it is still reground and reselected along with low grade small flake graphite. Therefore, the high-quality graphite with large flakes is destroyed, which also reduces the grinding and flotation efficiency of the small flake graphite. If high-quality graphite with large flakes can be separated in advance, the process can be greatly shortened and the separation index and separation efficiency can be improved.
    Graphite is a laminar non-metallic ore. In the sieving operation with a traditional sieving machine, the sieve mesh is at the bottom. During the sieving process, large pieces of minerals easily accumulate and cover the sieve pores due to gravity. Because of its resistance to sedimentation, floc minerals settle horizontally rather than vertically as they fall. On reaching the lower screen mesh, the small pieces overlap to form a "false large piece", and because of the good hydrophobicity of graphite, hydrophobic flocculation narrows the overlap. Even if the screen mesh increases the vibration, the laminar minerals do not fall off as easily as the granular minerals. On the contrary, the vibration will cause the "false large pieces" to overlap more closely, and the clogging of the screen pores is not reduced, making it difficult for small minerals to pass through the screen mesh. The sieving efficiency and the sieving effect are moderate. Therefore, it is necessary to design an apparatus that can effectively clean the screen mesh to ensure efficient screening.
    In order to solve the problem of the screening efficiency of graphite flaked layered non-metallic ore, Chinese Patent Publication No. CN207446662U discloses a screen mesh for the production of micaceous iron. This technology uses double-layer screens and uses the blowing action of the pulse solenoid valve to simultaneously clean the screens, which effectively improves the screening quality and reduces the adverse effects caused by the blockage of the screens. However, the size range of this equipment is small and the filling efficiency of screening materials is low. It is limited to dry sieving only and cannot be used in wet sieving.
    SUMMARY A technical problem to be solved by the description are the problems of small graphite flakes, long processes, high energy consumption and high costs with existing screening methods.
    Initially, the wet screen device comprises a cylinder with a pressure return line on top. The pressure return line is connected to a sump and the sump is connected to the slurry supply line and the slurry pump; the slurry pump is connected to the slurry inlet pipe which is inserted into the cylinder, and an anti-wear rubber pad is installed on the top of the cylinder opposite the outlet of the slurry inlet pipe; the inside of the cylinder is sheathed with a screen mesh which is a longitudinally mounted cylindrical screen mesh having openings at both ends, the cylindrical screen mesh is sheathed outside the slurry inlet pipe, a cavity is formed between the cylindrical screen mesh and the slurry inlet pipe, and the top and bottom of the cylindrical screen mesh are removably connected to the top and bottom of the cylinder, respectively; a pulsating rubber drumhead is installed at the bottom of the cavity, and a coarse-grain discharge chute is installed between the pulsating rubber drumhead and the cylindrical screen mesh, at least one coarse-grained discharge pipe is installed at the periphery, and a control valve is installed on the coarse grain - empty drain pipe; A fine-grain discharge funnel is installed between the cylindrical screen mesh and the cylinder.
    The cylinder is made of metal or polyurethane.
    The multiple screen meshes are arranged concentrically, and the top and bottom of the screen meshes are removably connected to the top and bottom of the cylinder, respectively; the mesh size of the multiple sieve meshes gradually decreases from the inside out.
    The screen mesh and the cylinder are bolted together.
    The number of fine-grain discharge hoppers is four, and they are evenly arranged along the circumferential direction, and the size of the fine-grain discharge hopper is adapted to the width between the cylinder and the screen mesh.
    In the second aspect, the short-flow purification process of graphite ore by wet sieving comprises the following steps: S1, after crushing the graphite ore, introducing it into the pre-processing machine for grinding and sorting, and then performing multi-stage grinding and flotation to to obtain graphite products; S52, placing the graphite products obtained after multi-stage grinding and flotation in the wet sieving device, and sieving the ore particles of the graphite products under the action of the pulse force supplied by the pulsating rubber drumhead and the water flow, wherein the fine-grained graphite which passes through the screen mesh, and the large flake graphite remaining in the screen mesh is used as concentrate I; S3, wherein the fine-grained graphite is brought into the next mill to be re-grinded, and then refloated to obtain fine-grained graphite as a concentrate II.
    The pulsation speed of the pulsating rubber drumhead in step S2 is 100 rpm - 300 rpm.
    The beneficial effect of the technical scheme proposed in the publication is: 1) Compared with the traditional method using multi-stage grinding, flotation process and final product screening process before use, the present invention uses a specific sieving apparatus for sieving, whereby the number of grinding steps and flotation are reduced, the process shortened and energy consumption and costs reduced; Meanwhile, the fine-grained graphite ore, the first product of which is large-scale graphite, enters the next mill for the grinding and refloating process, which greatly improves the yield and recovery of large-scale graphite.
    2) The graphite ore continuous wet sieving equipment uses a longitudinal screen mesh; instead of the traditional sieving method for gravity sedimentation, the fine-grained materials under the impulse force and the water flow force pass horizontally through the sieve pores to achieve sieving in the present invention; it effectively prevents flake mineral particles from overlapping, prevents the screen mesh from being covered by large flakes or overlapping "false large" minerals, reduces clogging of the screen mesh and improves the quality of flake graphite.
    3) In the graphite ore continuous wet screener, the height of the upper overflow pipe H is adjusted according to the size of the screen pores, the inlet flow and outlet flow, and the feed size distribution; It works with the coarse-grain and fine-grain discharge hopper to maintain stability of slurry input and output and maintain proper pressure differential on both sides of the screen mesh while reducing equipment damage and ensuring a simple process and easy operation.
    4) The graphite ore continuous wet sieving device ensures the pulsating separation of the ore pulp by the pulsating rubber drumhead, which makes the ore particles more evenly dispersed and improves the sieving efficiency.
    5) The graphite ore continuous wet screener forms a closed loop, which sequentially passes through the cylinder, the overhead return line, the sump, the slurry feed line, the slurry pump and the slurry inlet line; it can continuously screen large throughput material and also avoid the equipment damage caused by the instability of the pump flow and pressure to be suitable for industrial production.
    6) The graphite ore continuous wet sieving device is used in the wet sieving process, and there is no phenomenon of damage to workers due to dust during use.
    BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings are intended to provide a better understanding of embodiments of the disclosure. The drawings form part of the disclosure and serve to illustrate the principle of the embodiments of the disclosure along with the literal description. Apparently the drawings in the description below are only a few embodiments of the disclosure, one skilled in the art can obtain other drawings from these drawings without creative effort. In the numbers: FIG. 1 is a schematic diagram of the wet screen
    direction; FIG. 2 is a schematic diagram of the bottom structure of the cylinder in FIG. 1; FIG. 3 is a process flow diagram of the short flow graphite ore refining process through wet screens; In the picture above: (1) cylinder, (2) screen mesh, (3) slurry supply line, (4) pulsating rubber drum head, (5) fine grain hopper, (6) control valve, (7) coarse grain discharge line, (8) slurry pump , (9) sump, (10) slurry supply line, (11) pressure return line, (12) anti-wear rubber pad, (13) coarse grain discharge pipe.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS As indicated in FIG. 1, the wet screen device comprises a cylinder (1) with a pressure return line (11) at the top, the pressure return line (11) is connected to a sump (9) and the sump (2) is connected to the slurry supply line (10) and the slurry pump (8). The slurry pump (8) is connected to the slurry inlet line (3) which is inserted into the cylinder {1). The slurry passes through the slurry supply line (10) and enters the sump (9) and then it is sent from the slurry pump (8) into the slurry inlet line (3). And then it is ejected from the top of the slurry inlet pipe (3) and enters the screen mesh (2). In particular, the slurry enters the cavity formed by the screen mesh (2) and the slurry inlet line (3), and the pressure return line (11) at the top of the cylinder (1) is connected to the sump (9) to achieve the general circulation of the slurry. An anti-wear rubber pad (12) is installed on top of the cylinder (1) opposite the outlet of the slurry inlet line (3). The anti-wear rubber pad (12) is placed directly above the slurry inlet pipe (3), which can effectively absorb the damage to the cylinder (1) caused by the impact force of the sprayed slurry. The inside of the cylinder (1) is sheathed with a screen mesh (2) which is a longitudinally mounted cylindrical screen mesh (2) with openings at both ends. The cylindrical screen mesh (2)
    is sheathed outside the slurry inlet line (3) ). A cavity is formed between the cylindrical screen mesh (2) and the slurry inlet pipe (3), and the slurry sprayed through the slurry inlet pipe (3) enters the cavity for filtering and screening.
    To facilitate cleaning of the cylindrical screen mesh (2), the top and bottom of the cylindrical screen mesh (2) are removably connected to the top and bottom of the cylinder (1), respectively.
    As indicated in FIG. 2, a pulsating rubber drum head (4) is installed on the bottom of the cavity (1), and a coarse-grained discharge chute (13) is installed between the pulsating rubber drum head (4) and the cylindrical screen mesh (2), at at least one coarse-grained discharge pipe (7) is installed in the coarse-grained discharge chute (13) along the circumferential direction, and a control valve (6) is installed on the coarse-grained discharge pipe (7). The pulsating rubber drumhead (4) is connected to the over-center coupling and driven to make a pulsating movement through the over-center coupling so that the graphite and other laminar minerals are completely dispersed in the screen space. Meanwhile, under the influence of the impulse force and the water current force, a horizontal resultant force is generated; since the flake graphite is lightweight and settles in a flat manner, it can pass quickly through the screen mesh (2) to achieve screening action.
    Wherein the over-center coupling is prior art, and the specific construction is not described in detail, so long as the associated function can be realized.
    The fine grain discharge funnel (5) is installed between the cylindrical screen mesh (2) and the cylinder (1). The fine-grain discharge hopper (5) has a large size, a large number and a large displacement; the coarse-grained discharge pipe (7) has a small number, a small size and a small displacement; due to the screen mesh (2), the coarse-grained discharge pipe (7) and the fine-grained discharge bunker (5) are laterally spaced from each other, so that the screening is more complete.
    The control valve (6) on the coarse-grained discharge line (7) can be turned to increase or decrease the size of the discharge opening and thus adjust the displacement, so as to adjust the pressure of the cylinder (1). The height H of the pressure return line (11) at the top is adjustable and the height H is determined in accordance with the pressure to be maintained in the cavity. During use, it is adapted to the size of the sieve pores, the inlet or outlet flow rate and the size distribution of the feed particles.
    The multiple screen meshes are arranged concentrically, and the top and bottom of the screen meshes are removably connected to the top and bottom of the cylinder, respectively; the mesh size of the multiple sieve meshes gradually decreases from the inside out, so that the screening of graphite with different particle diameters can be achieved.
    The working principle of the wet sieving device is: The slurry passes through the slurry supply line (10) and enters the sump (9), and then it is sent from the slurry pump (8) into the slurry inlet line (3). And then it is ejected from the top of the slurry inlet pipe (3) and enters the screen mesh (2). The pulsating rubber drumhead (4) is started to disperse the graphite ore completely in the screen space under the action of the pulse force, which coordinates with the action of the water flow to produce a horizontal resultant force. Since the fine-grained graphite is lightweight and settles in a flat manner, it can quickly pass through the screen mesh (2) and the large flake graphite is blocked in the screen mesh (2) to achieve the purpose of sieving.
    As shown in FIG. 2, the short-flow purification process of graphite ore by wet sieving involves the following steps: S1, after crushing the graphite ore, introducing it into the pre-processing machine for grinding and sorting, and then performing multi-stage grinding and flotation to produce graphite pro- to obtain ducts; S2, placing the graphite products obtained after multi-stage grinding and flotation in the wet sieving device, and sieving the ore particles of the graphite products under the action of the pulse force supplied by the pulsating rubber drum sheet and the water flow, whereby the fine-grained graphite which passes through the screen mesh, and the large flake graphite remaining in the screen mesh is used as concentrate I; S3, wherein the fine-grained graphite is brought into the next mill to be re-grinded, and then refloated to obtain fine-grained graphite as a concentrate II.
    The invention is mainly directed to high-grade graphite ore with large flakes, to achieve the aim of protecting the large flakes and improving the quality. In comparison, the traditional graphite ore screening process is usually a multi-stage milling-flotation process. After the quality meets the requirement, it is dried and then subjected to dry sieving to obtain graphite with large flakes. Using traditional methods to obtain large flake graphite has the disadvantages of low efficiency, high energy consumption and long process flow. The invention uses high-grade graphite with large flakes, and the sieving is performed after the graphite with large flakes obtained by flotation meets the required quality; it shortens milling and flotation times, and increases the yield of large-scale graphite. Fine-grained graphite ore re-enters the subsequent milling and flotation process, improving overall quality, achieving the goal of shortening the sieving process, reducing energy consumption and protecting large flakes.
    The above process of applying water flow force to the graphite ore is: the graphite ore is completely dispersed in the screen space by pulsation, and at the same time lateral force is generated; Because the flake graphite is lightweight and settles in a flat manner, it can quickly pass through the screen mesh.
    The pulsation rate is 100 rpm - 300 rpm.
    The short flow purification process of graphite ore through wet sieving is suitable for large flake graphite, and the quality of large flake graphite is higher than that of fine grain graphite.
    In the following examples, the ore used is graphite ore from Lucbei, Heilongjiang, having a fixed carbon content of 13%. Example 1 Example 1 provides a short flow graphite ore purification process by wet sieving. After drying, crushing, sieving, shrinking and drying the graphite ore from Luobei, Heilongjiang, the original ore has a fixed carbon content of 13%. The screen mesh of the screening device is a single layer, and the diameter of the screen pore is 0.15 mm. Specifically, this example includes the following steps: After roughing 400 g of graphite ore, 4 ball mills and 4 flotation are performed. The total meal is 15 minutes. Sieving the flotation product for 10 minutes with the above screen device (screen pore 0.15 mm), and the large flake graphite on the screen mesh is used as concentrate I. The fine-grained graphite under the screen mesh enters the next mill to be re-processed grinded. After milling, the fine-grained graphite is subjected to flotation. The process adopts 4 times milling and 5 times flotation, and the obtained fine-grained graphite is used as concentrate II. After the graphite purification, the parameters of the obtained graphite with large flakes and fine-grained graphite are shown in Table 1.
    Table 1 Process results of milling, flotation, sieving and again flotation and milling Producti-Quality Recover- Productity/% ty/% ning/% Total Gra- 11.15 95.34 81.77 Cycle Concentrate 23.38% of Concentrate the total concentrate 95.89 19.23 I(+0.15 nm) concentrate 76.62% of Concentrate total concentrate 94.88 62.35 II{-0.15 mm) concentrate
    Comparative Example 1 Multi-stage milling and flotation processes are used to screen the final products.
    400 g of crude graphite ore is used, which is pre-processed for 8 minutes, and then 10 ball mills and 11 floats are performed.
    The total meal is 37.5 minutes.
    After drying, the flotation concentrate is subjected to a 0.15 mm dry screen to obtain +0.15 mm graphite concentrate and -0.15 mm graphite concentrate.
    After the graphite purification, the parameters of the obtained graphite with large flakes and fine-grained graphite are shown in Table 2. Table 2 Process results of milling and flotation Productivity Quality Recovery Productity/%ness/%ning/% Total grain 11.11 95.01 81.20 bicycle concentrate 19.20% of +0.15 mm the total concentrate 85.04 15.59 part concentrate concentrate 80.80% of -0.15 mm the total concentration 94.95 65.57 part concentrate concentrate Example 2 Example 2 provides a short flow purification process of graphite ore by means of wet sieving.
    After drying, crushing, sieving, shrinking and drying the graphite ore from Luobei, Heilongjiang, the original ore has a fixed carbon content of 13%. The screen mesh of the screening device is a single layer, and the diameter of the screen pore is 0.15 mm.
    Specifically, this example includes the following steps: After preprocessing 400 g of graphite ore for 8 minutes, 4 ball milling and 4 flotation processes (4 ball milling and 4 flotation processes can produce sufficient amount and high quality large flake graphite).
    The total meal is 21 minutes.
    Sift the flotation product for 10 minutes with the top
    the aforementioned screen device (screen pore 0.15 mm), and the large flake graphite on the screen mesh is used as concentrate I.
    The fine-grained graphite under the screen mesh enters the next mill to be ground again.
    After milling, the fine-grained graphite is subjected to flotation.
    The process adopts 3 times milling and 4 times flotation, and the obtained fine-grained graphite is used as concentrate II.
    After the graphite purification, the parameters of the obtained graphite with large flakes and fine-grained graphite are shown in Table 3. Table 3 Process results of milling, flotation, sieving and reflotation and milling Producti-Quality-Recovery-Productity/%ness/s ning/ % Total grain 87.10 12.608 94.11 phyt concentrate % 26.34% of concentrate total concentrate 97.41 24.87 1(+0.15 rm) concentrate 73.66% of concentrate total concentrate 96, 40 68.82 II (-0.15 mm) centrate Comparative Example 2 Multi-stage milling and flotation processes are used to screen the final products.
    Taking 400 g of crude graphite ore for roughing for 8 minutes, and performing 10 ball milling and 11 float milling.
    The total meal is 52.5 minutes.
    After drying, the flotation concentrate is subjected to a 0.15 mm dry screen to obtain +0.15 mm graphite concentrate and -0.15 mm graphite concentrate.
    After the graphite purification, the parameters of the obtained graphite with large flakes and fine-grained graphite are shown in Table 4.
    Table 4 Process results of milling and flotation Productivity Quality Recovery Productity/% /% ning /% Total grain 12.30 95.10 91.11 bike concentrate 17.73% of +0.15 mm the total concentration 96, 45 16.18 part concentrate concentrate 82.27% of +0.15 mm the total concentrate 95.50 74.34 part concentrate concentrate In summary, compared with the comparative example, the purification process reduces with a short process of graphite ore by wet sieving in the present invention, the enrichment process of 11 to 9 and 11 to 8, respectively, and greatly shortens the screening process. The total yield of graphite concentrate increased slightly. The floc ratio of graphite with large flakes to fine grain graphite is increased from 0.24:1 to 0.30:1 and from 0.22:1 to 0.36:1, respectively, which protects the graphite with large flakes and increases yield. The overall quality of graphite is increased from 95.01% to 95.34% and from 95.10% to 97.10%; the quality of large flake graphite is increased from 95.04% to 95.89% and from 96.45% to 97.41%; the quality of fine-grained graphite is reduced from 94.95% to 94.88 and increased from 95.50% to 96.40%, which improves production efficiency and reduces costs.
    In the description of the patent of the present invention, the orientation or installation relationship is indicated by each part based on the orientation or relationship shown in the drawings, which is only for the convenience of describing the patent and obtaining of a general understanding. It is not that the referenced device or element must have a specific orientation and configuration. Therefore, it cannot be considered as limiting the present invention. After reading this specification, the skilled person can make changes to this embodiment without making any creative additions.
    wear if necessary.
    However, as long as it falls within the scope of the claims of the present invention, it is protected by patent law.
    权利要求:
    Claims (7)
    [1]
    A wet screen device comprising: a cylinder having a pressure return line at the top, the pressure return line being connected to a sump and the sump being connected to the slurry supply line and the slurry pump; wherein the slurry pump is connected to the slurry inlet pipe which is inserted into the cylinder, and an anti-wear rubber pad is installed on the top of the cylinder opposite the outlet of the slurry inlet pipe; wherein the inside of the cylinder is sheathed with a screen mesh which is a longitudinally mounted cylindrical screen mesh having openings at both ends, the cylindrical screen mesh is sheathed outside the slurry inlet conduit, a cavity is formed between the cylindrical screen mesh and the slurry inlet pipe, and the upper and bottom of the cylindrical screen mesh are removably connected to the top and bottom of the cylinder, respectively; wherein a pulsating rubber drumhead is installed at the bottom of the cavity, and a coarse-grained discharge chute is installed between the pulsating rubber drum-head and the cylindrical screen, wherein at least one coarse-grained discharge pipe is installed circumferentially, and a control valve is installed on the coarse-grained discharge pipe ; wherein a fine-grain discharge funnel is installed between the cylindrical screen mesh and the cylinder.
    [2]
    The wet screen device of claim 1, wherein the cylinder is made of metal or polyurethane.
    [3]
    The wet screen device of claim 1, wherein the plurality of screen meshes are arranged concentrically, and the top and bottom of the screen meshes are removably connected to the top and bottom of the cylinder, respectively; wherein the mesh size of the multiple screen meshes gradually decreases from the inside to the outside.
    [4]
    A wet screen device according to claim 2, wherein the screen mesh and the cylinder are bolted together.
    [5]
    The wet screening device according to claim 1, wherein the number of fine-grain discharge hoppers is four, and they are arranged evenly along the circumferential direction, and the size of the fine-grain discharge hopper is adapted to the width between the cylinder and the screen mesh.
    [6]
    A short flow purification process of graphite ore by wet sieving, comprising the following steps: S1, after crushing the graphite ore, introducing into the roughing machine for grinding and sorting, and then performing multi-phase milling and flotation to obtain graphite products; S2, placing the graphite products obtained after multi-stage grinding and flotation in the wet sieving device, and sieving the ore particles of the graphite products under the action of the pulse force supplied by the pulsating rubber drumhead and the water flow, whereby the fine-grained graphite passing through the screen mesh and the large flake graphite remaining in the screen mesh is used as concentrate I; S3, wherein the fine-grained graphite is introduced into the next mill to be re-grinded and then refloated to obtain fine-grained graphite as a concentrate II.
    [7]
    The wet screen method for purifying graphite ore according to claim 6, characterized in that the pulsation speed of the pulsating rubber drumhead in step S2 is 100 rpm - 300 rpm.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010237902.2A|CN111495734A|2020-03-30|2020-03-30|Wet screening device and short-process purification method for graphite ore containing wet screening|
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