Pretreatment system for ore grinding overflow slurry

Abstract

The utility model belongs to the technical field of ore dressing, and particularly relates to a pretreatment system for ore grinding overflow slurry. And corresponding treatment devices can be selected for treatment according to the components of the ore grinding overflow slurry. The method comprises the following steps: 1, forming a desliming-pre-flotation-flotation treatment route in which the wet ball mill, the desliming device, the pre-flotation device and the spodumene flotation device are sequentially arranged; and 2, a pre-flotation-flotation treatment route in which the wet ball mill, the pre-flotation device and the spodumene flotation device are sequentially arranged is formed. And 3, a desliming-flotation treatment route in which the wet ball mill, the desliming device and the spodumene flotation device are sequentially arranged is formed. And 4, a flotation treatment route in which the wet ball mill and the spodumene flotation device are sequentially arranged is formed. And when the components of the ore grinding overflow slurry are changed and different, subsequent treatment is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of mineral processing technology, specifically relating to a pretreatment system for grinding overflow slurry. Background Technology

[0002] The grade of spodumene ore is the main indicator of the quality of spodumene mineral resources. The grade of spodumene ore determines the value of spodumene ore development and utilization, the direction of processing and utilization, and the production technology and process flow.

[0003] First, the mined spodumene is crushed into fine particles that meet the requirements using a crushing device. Then, the fine particles are subjected to heavy media separation, which yields lithium concentrate, middlings, and tailings. Middlings, with a grade between concentrate and tailings, is an intermediate product requiring further processing. A conveying system feeds the middlings into a wet ball mill for grinding. The grinding overflow slurry produced after the wet ball mill discharges and classifies the slurry requires further treatment. Current practice involves installing corresponding treatment equipment based on the composition of the grinding overflow slurry. Specifically, this includes, but is not limited to: when the grinding overflow slurry has a high mud content, a desliming device and a spodumene flotation device are installed downstream of the wet ball mill; when the grinding overflow slurry has a high mica content, a mica pre-flotation machine and a spodumene flotation device are installed downstream of the wet ball mill. However, when the composition of the grinding overflow slurry changes, different treatment devices need to be installed, posing technical problems of operational inconvenience. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a pretreatment system for grinding overflow slurry, which can select the appropriate treatment device for treatment according to the composition of the grinding overflow slurry.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a pretreatment system for grinding overflow slurry, including a wet ball mill, a desliming device, a pre-flotation device and a spodumene flotation device;

[0006] The slurry outlet of the wet ball mill is connected to the inlet of the desliming device via a first conveying mechanism, which is connected or disconnected via valve one; the slurry outlet of the desliming device is connected to the inlet of the pre-flotation device via a second conveying mechanism, which is connected or disconnected via valve two; the slurry outlet of the pre-flotation device is connected to the inlet of the spodumene flotation device via a third conveying mechanism, which is connected or disconnected via valve three.

[0007] The slurry outlet of the wet ball mill is connected to the feed inlet of the pre-flotation device through a fourth conveying mechanism, which is connected or disconnected by a valve.

[0008] The pre-floating device is connected to a pre-floating mineral discharge pipe at its pre-floating mineral discharge outlet, and a pre-floating mineral discharge valve is installed on the pre-floating mineral discharge pipe.

[0009] The slurry outlet of the wet ball mill is connected to the feed inlet of the spodumene flotation device through a fifth conveying mechanism, which is connected or disconnected through a valve.

[0010] The slurry outlet of the desliming device is connected to the feed inlet of the spodumene flotation device through a sixth conveying mechanism, which is connected or disconnected through a valve.

[0011] Furthermore, the first conveying mechanism is a first conveying pipe, and the valve is installed on the first conveying pipe;

[0012] The second conveying mechanism is a second conveying pipe, and the second valve is installed on the second conveying pipe;

[0013] The third conveying mechanism is a third conveying pipe, and the valve is installed on the third conveying pipe;

[0014] The fourth conveying mechanism is a fourth conveying pipe, and the fourth valve is installed on the fourth conveying pipe;

[0015] The fifth conveying mechanism is a fifth conveying pipe, and the fifth valve is installed on the fifth conveying pipe;

[0016] The sixth conveying mechanism is the sixth conveying pipe, and the valve is installed on the sixth conveying pipe.

[0017] Furthermore, it also includes the main delivery pipe and the four-way connector;

[0018] The feed end of the main conveying pipe is connected to the slurry outlet of the wet ball mill, the discharge end of the main conveying pipe is connected to the first interface of the four-way connector, the feed end of the first conveying pipe is connected to the second interface of the four-way connector, the feed end of the fourth conveying pipe is connected to the third interface of the four-way connector, and the feed end of the fifth conveying pipe is connected to the fourth interface of the four-way connector.

[0019] Furthermore, sealing rings are provided between the discharge end of the main conveying pipe and the first interface of the four-way connector, between the inlet end of the first conveying pipe and the second interface of the four-way connector, between the inlet end of the fourth conveying pipe and the third interface of the four-way connector, and between the inlet end of the fifth conveying pipe and the fourth interface of the four-way connector.

[0020] Furthermore, the sealing ring is made of rubber.

[0021] Furthermore, valves one, two, three, four, five, six, and the pre-floating mineral discharge valve are all butterfly valves.

[0022] Furthermore, the main delivery pipe is made of one or more of the following materials: ultra-high molecular weight polymers, inorganic non-metallic materials, hard metals, and composite materials.

[0023] The material of the four-way connector is one or a combination of several of the following: ultra-high molecular weight materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0024] The material of the first delivery pipe is one or a combination of several of the following: ultra-high molecular weight polymers, inorganic non-metallic materials, hard metals, and composite materials.

[0025] The material of the second delivery pipe is one or a combination of several of the following: ultra-high molecular weight polymers, inorganic non-metallic materials, hard metals, and composite materials.

[0026] The material of the third conveying pipe is one or a combination of several of the following: ultra-high molecular weight materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0027] The material of the fourth conveying pipe is one or a combination of several of the following: ultra-high molecular weight materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0028] The material of the fifth conveying pipe is one or a combination of several of the following: ultra-high molecular weight materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0029] The material of the sixth conveying pipe is one or a combination of several of the following: ultra-high molecular weight materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0030] The material of the pre-floating mineral discharge pipe is one or a combination of ultra-high molecular weight materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0031] Furthermore, the spodumene flotation device is a spodumene roughing device.

[0032] Furthermore, the desliming device is a hydrocyclone, a desliming hopper, or a spiral classifier.

[0033] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model provides a pretreatment system for grinding overflow slurry, which can select appropriate treatment devices according to the composition of the grinding overflow slurry. 1. It forms a desliming-pre-flotation-flotation treatment route with a wet ball mill, desliming device, pre-flotation device, and spodumene flotation device arranged sequentially. 2. It forms a pre-flotation-flotation treatment route with a wet ball mill, pre-flotation device, and spodumene flotation device arranged sequentially. 3. It forms a desliming-flotation treatment route with a wet ball mill, desliming device, and spodumene flotation device arranged sequentially. 4. It forms a flotation treatment route with a wet ball mill and spodumene flotation device arranged sequentially. When the composition of the grinding overflow slurry changes or differs, it facilitates subsequent processing. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model;

[0035] Figure 2 This is a schematic diagram showing the main conveying pipe, the first conveying pipe, the fourth conveying pipe, and the fifth conveying pipe connected to the four-way connector.

[0036] Reference numerals in the attached drawings: 1-Wet ball mill; 2-Desliming device; 3-Pre-flotation device; 4-Spodumene flotation device; 5-First conveying pipe; 501-Valve 1; 6-Second conveying pipe; 601-Valve 2; 7-Third conveying pipe; 701-Valve 3; 8-Fourth conveying pipe; 801-Valve 4; 9-Fifth conveying pipe; 901-Valve 5; 10-Sixth conveying pipe; 1001-Valve 6; 11-Tails discharge pipe; 1101-Discharge valve; 12-Sludge discharge pipe; 1201-Sludge discharge valve; 13-Pre-flotation mineral discharge pipe; 1301-Pre-flotation mineral discharge valve; 14-Main conveying pipe; 15-Four-way connector. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] A pretreatment system for grinding overflow slurry includes a wet ball mill 1, a desliming device 2, a pre-flotation device 3, and a spodumene flotation device 4. The slurry outlet of the wet ball mill 1 is connected to the inlet of the desliming device 2 via a first conveying mechanism, which is connected or disconnected via valve 501. The slurry outlet of the desliming device 2 is connected to the inlet of the pre-flotation device 3 via a second conveying mechanism, which is connected or disconnected via valve 601. The slurry outlet of the pre-flotation device 3 is connected to the inlet of the spodumene flotation device 4 via a third conveying mechanism, which is connected or disconnected via valve 701. The wet ball mill 1... The slurry outlet of the wet ball mill 1 is connected to the inlet of the pre-flotation device 3 via a fourth conveying mechanism, which is connected or disconnected via valve 801. The pre-flotation mineral outlet of the pre-flotation device 3 is connected to a pre-flotation mineral discharge pipe 13, and a pre-flotation mineral discharge valve 1301 is installed on the pre-flotation mineral discharge pipe 13. The slurry outlet of the wet ball mill 1 is connected to the inlet of the spodumene flotation device 4 via a fifth conveying mechanism, which is connected or disconnected via valve 901. The slurry outlet of the desliming device 2 is connected to the inlet of the spodumene flotation device 4 via a sixth conveying mechanism, which is connected or disconnected via valve 1001.

[0039] The first conveying mechanism can be a first conveying trough, the second conveying mechanism can be a second conveying trough, the third conveying mechanism can be a third conveying trough, the fourth conveying mechanism can be a fourth conveying trough, the fifth conveying mechanism can be a fifth conveying trough, and the sixth conveying mechanism can be a sixth conveying trough. Preferably, the first conveying mechanism is a first conveying pipe 5, and valve 1 501 is installed on the first conveying pipe 5; the second conveying mechanism is a second conveying pipe 6, and valve 2 601 is installed on the second conveying pipe 6; the third conveying mechanism is a third conveying pipe 7, and valve 3 701 is installed on the third conveying pipe 7; the fourth conveying mechanism is a fourth conveying pipe 8, and valve 4 801 is installed on the fourth conveying pipe 8; the fifth conveying mechanism is a fifth conveying pipe 9, and valve 5 901 is installed on the fifth conveying pipe 9; the sixth conveying mechanism is a sixth conveying pipe 10, and valve 6 1001 is installed on the sixth conveying pipe 10.

[0040] Currently, pre-floating minerals refer to easily floatable gangue minerals such as mica and amphibole.

[0041] The sludge discharge port of the desludge removal device 2 is connected to a sludge discharge pipe 12, and a sludge discharge valve 1201 is installed on the sludge discharge pipe 12.

[0042] The pre-floating device 3 is used to pre-float easily floating gangue minerals such as mica and amphibole.

[0043] The tailings outlet of the spodumene flotation device 4 is connected to a tailings discharge pipe 11, and a discharge valve 1101 is installed on the tailings discharge pipe 11.

[0044] Example 1: A desliming-pre-flotation-flotation treatment route is formed by sequentially arranging a wet ball mill 1, a desliming device 2, a pre-flotation device 3, and a spodumene flotation device 4.

[0045] Specifically, when the -10μm mineral content in the grinding overflow slurry discharged from the wet ball mill 1 is greater than or equal to 10wt%, valve 1 501 opens, and valves 4 801 and 5 901 close. The grinding overflow slurry discharged from the slurry outlet of the wet ball mill 1 enters the desliming device 2 through the first conveying pipe 5 for desliming. After desliming, the slurry discharge valve 1201 opens, and the slurry is discharged through the slurry discharge pipe 12. When the pre-flotation mineral content in the deslimed slurry is greater than or equal to 15wt%, valve 2 601 opens, and the deslimed slurry enters the pre-flotation device 3 through the second conveying pipe 6 for pre-flotation and impurity removal. After pre-flotation and impurity removal, the pre-flotation mineral discharge valve 1301 opens, and the pre-flotation mineral is discharged through the pre-flotation mineral discharge pipe 13. Valve 3 701 opens, and the deslimed and pre-flotation impurity removed slurry enters the spodumene flotation device 4 through the third conveying pipe 7 to float spodumene. The tailings after flotation are discharged through the tailings discharge pipe 11.

[0046] Example 2: A pre-flotation-flotation treatment route is formed by sequentially arranging a wet ball mill 1, a pre-flotation device 3, and a spodumene flotation device 4.

[0047] Specifically, when the -10μm mineral content in the grinding overflow slurry discharged from the wet ball mill 1 is less than 10wt%, and the pre-flotation mineral content in the grinding overflow slurry discharged from the wet ball mill 1 is greater than or equal to 15wt%, valve four 801 opens, and valve one 501 and valve five 901 close. The grinding overflow slurry discharged from the slurry outlet of the wet ball mill 1 enters the pre-flotation device 3 through the fourth pipe 8 for pre-flotation and impurity removal. After pre-flotation and impurity removal, the pre-flotation mineral discharge valve 1301 opens, and the pre-flotation minerals are discharged through the pre-flotation mineral discharge pipe 13. Valve three 701 opens, and the slurry after pre-flotation and impurity removal enters the spodumene flotation device 4 through the third conveying pipe 7 to float spodumene. The tailings after flotation are discharged through the tailings discharge pipe 11.

[0048] Example 3: A desliming-flotation treatment route is formed by sequentially arranging a wet ball mill 1, a desliming device 2, and a spodumene flotation device 4.

[0049] Specifically, when the -10μm mineral content in the grinding overflow slurry discharged from the wet ball mill 1 is greater than or equal to 10wt%, valve 501 is opened, and valves 801 and 901 are closed. The grinding overflow slurry discharged from the slurry outlet of the wet ball mill 1 enters the desliming device 2 through the first conveying pipe 5 for desliming. After desliming, the slurry discharge valve 1201 is opened, and the slurry is discharged through the slurry discharge pipe 12. When the pre-flotation mineral content in the deslimed slurry is less than 15wt%, valve 1001 is opened. The deslimed slurry enters the spodumene flotation device 4 through the sixth conveying pipe 10 to float spodumene. The tailings after flotation are discharged through the tailings discharge pipe 11.

[0050] Example 4: A flotation process route is formed by sequentially setting up a wet ball mill 1 and a spodumene flotation device 4.

[0051] Specifically, when the content of -10μm minerals in the grinding overflow slurry discharged from the wet ball mill 1 is less than 10wt%, and the content of pre-flotation minerals in the grinding overflow slurry discharged from the wet ball mill 1 is less than 15wt%, valve 501 is opened, valve 1 and valve 4 are closed, and the grinding overflow slurry discharged from the slurry outlet of the wet ball mill 1 enters the spodumene flotation device 4 through the fifth conveying pipe 9 to float spodumene. The tailings after flotation are discharged through the tailings discharge pipe 11.

[0052] Specifically, it also includes a main conveying pipe 14 and a four-way connector 15; the feed end of the main conveying pipe 14 is connected to the slurry outlet of the wet ball mill 1, the discharge end of the main conveying pipe 14 is connected to the first interface of the four-way connector 15, the feed end of the first conveying pipe 5 is connected to the second interface of the four-way connector 15, the feed end of the fourth conveying pipe 8 is connected to the third interface of the four-way connector 15, and the feed end of the fifth conveying pipe 9 is connected to the fourth interface of the four-way connector 15.

[0053] Preferably, sealing rings are provided between the discharge end of the main conveying pipe 14 and the first interface of the four-way connector 15, between the inlet end of the first conveying pipe 5 and the second interface of the four-way connector 15, between the inlet end of the fourth conveying pipe 8 and the third interface of the four-way connector 15, and between the inlet end of the fifth conveying pipe 9 and the fourth interface of the four-way connector 15. By providing sealing rings, leakage can be effectively prevented between the discharge end of the main conveying pipe 14 and the first interface of the four-way connector 15, between the inlet end of the first conveying pipe 5 and the second interface of the four-way connector 15, between the inlet end of the fourth conveying pipe 8 and the third interface of the four-way connector 15, and between the inlet end of the fifth conveying pipe 9 and the fourth interface of the four-way connector 15.

[0054] The sealing ring can be made of silicone, and preferably, the sealing ring is made of rubber.

[0055] Valve 501, valve 601, valve 701, valve 801, valve 901, valve 1001, and pre-floating mineral discharge valve 1301 can all be ball valves, gate valves, etc. Preferably, valves 501, 601, 701, 801, 901, 1001, and 1301 are all butterfly valves.

[0056] Specifically, the main conveying pipe 14 is made of one or more of the following materials: ultra-high molecular weight polymer (UHMWPP), inorganic non-metallic materials, hard metal materials, and composite materials; the four-way connector 15 is made of one or more of the following materials: UHMWPP), inorganic non-metallic materials, hard metal materials, and composite materials; the first conveying pipe 5 is made of one or more of the following materials: UHMWPP), inorganic non-metallic materials, hard metal materials, and composite materials; the second conveying pipe 6 is made of one or more of the following materials: UHMWPP), inorganic non-metallic materials, hard metal materials, and composite materials; and the third conveying pipe 7 is made of UHMWPP) and inorganic non-metallic materials. The materials are: one or more of the following: materials, hard metal materials, and composite materials; the material of the fourth conveying pipe 8 is one or more of the following: materials, inorganic non-metallic materials, hard metal materials, and composite materials; the material of the fifth conveying pipe 9 is one or more of the following: materials, inorganic non-metallic materials, hard metal materials, and composite materials; the material of the sixth conveying pipe 10 is one or more of the following: materials, inorganic non-metallic materials, hard metal materials, and composite materials; and the material of the pre-floating mineral discharge pipe 13 is one or more of the following: materials, inorganic non-metallic materials, hard metal materials, and composite materials.

[0057] Ultra-high molecular weight materials (UHMWPEs) are materials formed from ultra-high molecular weight polymers. They have extremely high molecular weights, typically exceeding 1 million, and possess excellent physical and chemical properties. UHMWPEs include ultra-high molecular weight polyethylene (UHMWPE), polytetrafluoroethylene (PTFE), and polyetheretherketone (PEEK), among others.

[0058] Inorganic non-metallic materials are those primarily composed of silicates, oxides, and carbides. They possess excellent corrosion resistance, high-temperature resistance, and mechanical strength, and represent the current state of technology. Inorganic non-metallic materials include ceramics, fiberglass, graphite, and silicon carbide.

[0059] Hard metal materials and composite materials are both existing materials.

[0060] The spodumene flotation device 4 can be a spodumene refining device, preferably a spodumene roughing device.

[0061] Preferably, the desliming device 2 is a hydrocyclone, a desliming hopper, or a spiral classifier. Hydrocyclones, desliming hoppers, or spiral classifiers are all devices in the prior art.

[0062] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pre-treatment system for grinding overflow slurry, characterized by: It comprises a wet ball mill (1), a desliming device (2), a pre-floating device (3) and a spodumene flotation device (4); The pulp outlet of the wet ball mill (1) is connected with the feed inlet of the desliming device (2) through a first conveying mechanism, which is connected or disconnected through a valve one (501); the pulp outlet of the desliming device (2) is connected with the feed inlet of the pre-floating device (3) through a second conveying mechanism, which is connected or disconnected through a valve two (601); the pulp outlet of the pre-floating device (3) is connected with the feed inlet of the spodumene flotation device (4) through a third conveying mechanism, which is connected or disconnected through a valve three (701); The pulp outlet of the wet ball mill (1) is connected with the feed inlet of the pre-floating device (3) through a fourth conveying mechanism, which is connected or disconnected through a valve four (801); The pre-floating mineral discharge outlet of the pre-floating device (3) is connected with a pre-floating mineral discharge pipe (13), and a pre-floating mineral discharge valve (1301) is installed on the pre-floating mineral discharge pipe (13); The pulp outlet of the wet ball mill (1) is connected with the feed inlet of the spodumene flotation device (4) through a fifth conveying mechanism, which is connected or disconnected through a valve five (901); The pulp outlet of the desliming device (2) is connected with the feed inlet of the spodumene flotation device (4) through a sixth conveying mechanism, which is connected or disconnected through a valve six (1001).

2. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 1, characterized in that: The first conveying mechanism is a first conveying pipe (5), and the valve one (501) is installed on the first conveying pipe (5); The second conveying mechanism is a second conveying pipe (6), and the valve two (601) is installed on the second conveying pipe (6); The third conveying mechanism is a third conveying pipe (7), and the valve three (701) is installed on the third conveying pipe (7); The fourth conveying mechanism is a fourth conveying pipe (8), and the valve four (801) is installed on the fourth conveying pipe (8); The fifth conveying mechanism is a fifth conveying pipe (9), and the valve five (901) is installed on the fifth conveying pipe (9); The sixth conveying mechanism is a sixth conveying pipe (10), and the valve six (1001) is installed on the sixth conveying pipe (10).

3. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 2, characterized in that: It further comprises a main conveying pipe (14) and a four-way joint (15); The feed end of the main conveying pipe (14) is connected with the pulp outlet of the wet ball mill (1), the discharge end of the main conveying pipe (14) is connected with the first interface of the four-way joint (15), the feed end of the first conveying pipe (5) is connected with the second interface of the four-way joint (15), the feed end of the fourth conveying pipe (8) is connected with the third interface of the four-way joint (15), and the feed end of the fifth conveying pipe (9) is connected with the fourth interface of the four-way joint (15).

4. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 3, characterized in that: A sealing ring is arranged between the discharge end of the main conveying pipe (14) and the first interface of the four-way joint (15), between the feed end of the first conveying pipe (5) and the second interface of the four-way joint (15), between the feed end of the fourth conveying pipe (8) and the third interface of the four-way joint (15), and between the feed end of the fifth conveying pipe (9) and the fourth interface of the four-way joint (15).

5. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 4, characterized in that: The sealing ring is a rubber product.

6. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 1, characterized by: The valve one (501), valve two (601), valve three (701), valve four (801), valve five (901), valve six (1001), and pre-float mineral discharge valve (1301) are butterfly valves.

7. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 3, characterized by: The material of the main conveying pipe (14) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the four-way joint (15) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the first conveying pipe (5) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the second conveying pipe (6) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the third conveying pipe (7) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the fourth conveying pipe (8) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the fifth conveying pipe (9) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the sixth conveying pipe (10) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material. The material of the pre-float mineral discharge pipe (13) is one or a combination of ultra-high molecular material, inorganic non-metallic material, hard metal material, and composite material.

8. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 1, characterized by: The lithium spodumene flotation device (4) is a lithium spodumene roughing device.

9. The pre-treatment system of an ore grinding overflow slurry as claimed in claim 1, characterized by: The desliming device (2) is a cyclone, a desliming bucket, or a spiral classifier.

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