Ore crushing and grinding system and crushing and grinding process

Abstract

The present invention discloses an ore crushing and grinding system and crushing and grinding process, comprising a crushing station, a pre-screening system, and a grinding system. The crushing station includes a main crushing station and an auxiliary feeding station. Both the main crushing station and the auxiliary feeding station are connected to the feed end of the pre-screening system. The discharge end of the pre-screening system is connected to the feed end of the grinding system. The discharge end of the grinding system is connected to the flotation system. The main crushing station crushes ore with a particle size of 0 to 1000 mm to less than 275 mm, and the auxiliary feeding station crushes ore with a particle size of 0 to 300 mm to less than 275 mm. The crushed ore enters the pre-screening system. Material less than 2 mm is directly fed into the grinding slurry pump tank for classification. Material not less than 2 mm enters the grinding system. After grinding and classification, the overflow product is finally supplied to the flotation system. The present invention increases the reliability and stability of the crushing station, achieves continuous ore supply to the grinding and flotation system, and saves equipment investment costs.

Description

Technical Field

[0001] The present invention relates to the technical field of ore crushing and grinding, and in particular to an ore crushing and grinding system and a crushing and grinding process. Background Art

[0002] As the scale of mine construction continues to expand, more and more mineral processing plants are adopting the "SAB(C)" crushing and grinding process. This process has the characteristics of compact equipment configuration, small footprint, low environmental pollution, and high degree of automation. The common form is "crushing station + intermediate ore pile + grinding system", among which the intermediate ore pile is mainly used to store qualified particle size materials after crushing, ensuring the continuity of the production links between the crushing system and external transportation and internal processes, playing a buffering and regulating role, and achieving the purpose of continuous feeding for the grinding operation.

[0003] However, actual production has revealed that using the "SAB(C)" grinding process to process highly oxidized ores has certain drawbacks. This is primarily due to the high fines content of such ores, which can easily lead to muddying during the rainy season. This can cause blockages in the intermediate ore stockpile discharge port, preventing continuous feed to the mill. Furthermore, clearing these blockages requires significant manpower and material resources, posing a significant safety hazard.

[0004] To avoid blockage in the intermediate ore pile, some mines have opted to eliminate it and instead feed the crushed product directly into the grinding system. However, because traditional crushing stations have only a single feed line containing the crusher, when critical equipment like the crusher is down for maintenance or a malfunction, the intermediate ore pile is missing and continuous feeding to the grinding system is impossible. Subsequent grinding and flotation operations are simultaneously halted, severely impacting the mine's effective operating days. Summary of the Invention

[0005] The present invention provides an ore crushing and grinding system and a crushing and grinding process to solve the technical problem that the front end of the existing grinding system cannot continuously feed the grinding system when crushing and grinding ore containing a large amount of fine ore.

[0006] According to one aspect of the present invention, an ore crushing and grinding system is provided, comprising a crushing station, a pre-screening system, and a grinding system. The crushing station comprises a main crushing station and an auxiliary feeding station. The main crushing station and the auxiliary feeding station are both connected to the feed end of the pre-screening system. The discharge end of the pre-screening system is connected to the feed end of the grinding system. The discharge end of the grinding system is connected to the flotation system.

[0007] The main crushing station and the auxiliary feeding station are distributed vertically or approximately vertically in the same plane. The main crushing station crushes ore with a particle size of 0-1000mm to less than 275mm, and the auxiliary feeding station crushes ore with a particle size of 0-300mm to less than 275mm.

[0008] Furthermore, the main crushing station includes a first raw ore bin, a first grid screen, a first heavy-duty plate feeder, and a jaw crusher. The first grid screen performs preliminary screening on the ore entering the first raw ore bin, so that the ore under the screen directly enters the first heavy-duty plate feeder and the jaw crusher in sequence.

[0009] Furthermore, the main crushing station also includes a first oil hammer, which crushes the ore on the first grid screen, so that the ore passes through the first grid screen and enters the first heavy plate feeder and the jaw crusher in sequence.

[0010] Furthermore, the auxiliary feeding station includes a second raw ore bin, a second grid screen and a second heavy-duty plate feeder. The second grid screen performs preliminary screening on the ore entering the second raw ore bin, so that part of the ore under the screen directly enters the second heavy-duty plate feeder.

[0011] Furthermore, the auxiliary feeding station further comprises a second oil hammer, which crushes the ore on the second grid screen so that the ore passes through the second grid screen 21 and enters the second heavy-duty plate feeder.

[0012] Furthermore, the discharge end of the pre-screening system includes an upper screen outlet and an lower screen outlet, the grinding system includes a semi-autogenous mill, a coarse-grained screening device, a grinding slurry pump pool, a slurry pump, a fine-grained classification device, a ball mill, and a stubborn stone crushing system, the upper screen outlet of the pre-screening system is connected to the feed end of the semi-autogenous mill, the lower screen outlet is connected to the feed end of the grinding slurry pump pool, the discharge end of the semi-autogenous mill is connected to the feed end of the coarse-grained screening device, the discharge end of the coarse-grained screening device includes an upper screen outlet and an lower screen outlet, the upper screen outlet of the coarse-grained screening device is connected to the stubborn stone crushing device The feed end of the crushing system is connected, the outlet of the underscreen part of the coarse-grained screening equipment is connected to the feed end of the grinding slurry pump pool, the discharge end of the grinding slurry pump pool is connected to the feed end of the slurry pump, the discharge end of the slurry pump is connected to the feed end of the fine-grained classification equipment, the discharge end of the fine-grained classification equipment includes an upper outlet and a lower outlet, the upper outlet of the fine-grained classification equipment is connected to the flotation system, the lower outlet of the fine-grained classification equipment is connected to the feed end of the ball mill, the discharge end of the ball mill is connected to the feed end of the grinding slurry pump pool, and the discharge end of the stubborn stone crushing system is connected to the feed end of the semi-autogenous mill.

[0013] Furthermore, the pebble crushing system includes a pebble bin and a fine-grained crusher, the feed end of the pebble bin is connected to the outlet of the above-screen part of the coarse-grained screening equipment, the discharge end of the pebble bin is connected to the feed end of the fine-grained crusher, and the discharge end of the fine-grained crusher is connected to the feed end of the semi-autogenous grinding mill.

[0014] Furthermore, the pre-screening system (4) includes a ore washer, a cylindrical screen or a linear vibrating screen.

[0015] According to another aspect of the present invention, there is also provided an ore crushing and grinding process, comprising the following steps:

[0016] (1) ores with a particle size of 0 to 1000 mm are crushed in a primary crushing station, and / or ores with a particle size of 0 to 300 mm are processed in an auxiliary feeding station to obtain crushed ore, wherein the particle size of the crushed ore is less than 275 mm;

[0017] (2) The crushed ore enters the pre-screening system for pre-screening, and the material with a size of not less than 2 mm enters the semi-autogenous grinding mill for grinding, and the material with a size less than 2 mm enters the grinding slurry pump pool;

[0018] (3) After the materials in the semi-autogenous mill are ground, they are screened by a coarse particle screening device. The materials with a particle size of not less than 15 mm enter the stone crushing system for processing, and the materials with a particle size of less than 15 mm enter the grinding slurry pump pool;

[0019] (4) The material entering the stone crushing system is crushed and then re-enters the semi-autogenous grinding mill for grinding, and then returns to the above step (3);

[0020] (5) The material entering the grinding slurry pump pool (58) is sent to the fine-grained classification device (511) by the slurry pump (59) for classification. The upper outlet product of the fine-grained classification device (511) is overflow, and the overflow enters the flotation system (6), wherein the overflow has a particle size of less than 0.074 mm accounting for not less than 75%; the lower outlet product is sediment, and the sediment enters the ball mill (510) for grinding, wherein the sediment has a particle size of less than 0.074 mm accounting for 10% to 15%;

[0021] (6) The material entering the ball mill is ground and then re-enters the grinding slurry pump tank, returning to step (5) until all the material enters the flotation system.

[0022] Furthermore, the material entering the pebble crushing system first enters the pebble bin and then enters the fine-grained crusher for crushing, and the crushed material re-enters the semi-autogenous grinding mill for grinding.

[0023] The present invention has the following beneficial effects:

[0024] (1) Based on the inherent characteristics of the ore, the present invention creatively eliminates the intermediate ore piles or other forms of material storage facilities used in the prior art, significantly saving mine construction costs. The optimized process flow is more adaptable to ores containing a large amount of fine ore, fundamentally reducing the potential for blockage failures.

[0025] (2) The crushing station is equipped with a main crushing system and an auxiliary feeding system. The two can feed ore independently, but their configurations are different. The main crushing system can be used to process 0-1000mm raw ore, while the auxiliary feeding system is used to process 0-300mm raw ore. This solution not only increases the reliability and stability of the crushing station, achieving the goal of continuous ore supply to the grinding and flotation equipment, but also minimizes equipment procurement costs.

[0026] (3) The pre-screening system can separate some fine particles from the raw ore in advance, effectively reducing the load of the semi-autogenous grinding mill and improving the overall production capacity of the grinding system.

[0027] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic structural diagram of a crushing and grinding system for processing high oxidation rate ores according to a preferred embodiment of the present invention.

[0030] Legend:

[0031] 100. Crushing station; 1. Main crushing station; 11. First screen; 12. First ore bin; 13. First heavy-duty apron feeder; 14. Jaw crusher; 15. First belt conveyor; 16. First oil hammer; 2. Auxiliary feeding station; 21. Second screen; 22. Second ore bin; 23. Second heavy-duty apron feeder; 24. Second belt conveyor; 25. Second oil hammer; 3. Third belt conveyor; 4. Pre-screening system; 5. Grinding system; 51. Fine-grain crusher; 52. Fourth belt conveyor; 53. Semi-autogenous grinding mill; 54. Coarse-grain screening equipment; 55. Fifth belt conveyor; 56. Stone bin; 57. Sixth belt conveyor; 58. Grinding slurry pump tank; 59. Slurry pump; 510. Ball mill; 511. Fine-grain classification equipment; 6. Flotation system; 7. Loader. DETAILED DESCRIPTION

[0032] In order to make the invention purpose, technical scheme and beneficial technical effect of the present invention clearer, the present invention is further described in detail below with reference to the embodiments. It should be understood that the embodiments described in this specification are only for explaining the present invention and are not intended to limit the present invention.

[0033] For simplicity, only some numerical ranges are explicitly disclosed herein. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, and similarly, any upper limit can be combined with any other upper limit to form an unspecified range. In addition, although not explicitly stated, each point or individual value between the endpoints of a range is included in the range. Thus, each point or individual value can serve as its own lower limit or upper limit and be combined with any other point or individual value, or with other lower limits or upper limits, to form an unspecified range.

[0034] In the description of this article, it should be noted that, unless otherwise specified, "above" and "below" are inclusive of the number itself, and the "multiple" in "one or more" means two or more, and the "multiple" in "one or more" means two or more.

[0035] An embodiment of the first aspect of the present invention provides an ore crushing and grinding system, including a crushing station 100, a pre-screening system 4 and a grinding system 5. The crushing station 100 includes a main crushing station 1 and an auxiliary feeding station 2. The main crushing station 1 and the auxiliary feeding station 2 are both connected to the feed end of the pre-screening system 4, the discharge end of the pre-screening system 4 is connected to the feed end of the grinding system 5, and the discharge end of the grinding system 5 is connected to the flotation system 6.

[0036] The main crushing station 1 and the auxiliary feeding station 2 are distributed vertically or approximately vertically in the same plane. The main crushing station 1 crushes ore with a particle size of 0-1000 mm to less than 275 mm, and the auxiliary feeding station 2 crushes ore with a particle size of 0-300 mm to less than 275 mm.

[0037] like Figure 1 As shown, in this embodiment of the present invention, the crushing station 100 includes two independent ore feeding systems: a primary crushing system and an auxiliary feeding system. The primary and auxiliary feeding systems are arranged vertically on the same plane, each capable of independent ore supply. There is no intermediate ore pile or other storage facilities behind the crushing station 100. Qualified ore processed by the crushing station 100 enters the pre-screening system 4. This qualified ore can be delivered to the pre-screening system 4 by a first belt conveyor.

[0038] According to an embodiment of the present invention, the crushing station 100 can realize continuous and stable ore supply to the pre-screening system. During normal production, the main crushing system is used to process ore mainly composed of lump ore (particle size is 0mm~1000mm); when the main crushing system equipment is maintained or shut down due to a fault, the auxiliary feeding system is used to process ore mainly composed of powder ore (particle size is 0mm~300mm).

[0039] In an embodiment of the present invention, the main crushing station 1 includes a first raw ore bin 12, a first grid screen 11, a first heavy-duty plate feeder 13, and a jaw crusher 14. The first grid screen 11 performs preliminary screening on the ore entering the first raw ore bin 12, so that the ore under the screen directly enters the first heavy-duty plate feeder 13 and the jaw crusher 14 in sequence.

[0040] In some embodiments, the primary crushing station 1 has an adjustable first grizzly screen 11 mounted atop a first ore bin 12. The first heavy-duty apron feeder 13 is tilted upward at a 17° angle to the bottom of the first ore bin 12. A chain curtain is mounted at the head of the first heavy-duty apron feeder 13 to cushion the ore. The jaw of the jaw crusher 14 is connected to the head of the first heavy-duty apron feeder 13.

[0041] In some embodiments, a first belt conveyor 15 is further installed below the first heavy-duty plate feeder 13 and the jaw crusher 14 for conveying processed ore.

[0042] In an embodiment of the present invention, the main crushing station 1 further includes a first oil hammer 16, which crushes the ore above the first grizzly screen 11, so that the ore passes through the first grizzly screen 11 and enters the first heavy-duty plate feeder 13 and the jaw crusher 14 in sequence.

[0043] In some embodiments, the primary crushing station 1 operates as follows: ore, primarily lump ore, is transported to the first ore bin 12 of the primary crushing station 1. After pre-screening by a first grating 11, the undersize material is fed to a jaw crusher 14 via a first heavy-duty plate feeder 13 for crushing to an acceptable particle size. The oversize material from the first grating 11 is further crushed by a first oil hammer 16 before being fed back into the primary crushing system. The particle size of the qualified material after processing in the crushing station 100 is less than 275 mm.

[0044] In an embodiment of the present invention, the auxiliary feeding station 2 includes a second raw ore bin 22, a second grid screen 21 and a second heavy-duty plate feeder 23. The second grid screen 21 performs preliminary screening on the ore entering the second raw ore bin 22, so that the ore under the screen directly enters the second heavy-duty plate feeder 23.

[0045] In some embodiments, the second grating 21 of the auxiliary feeding station 2 is mounted on top of the second raw ore bin 22. The size of the second grating 21 is adjustable. A second heavy-duty apron feeder 23 is mounted horizontally on top of the second raw ore bin 22. A chain curtain is installed at the head of the second heavy-duty apron feeder 23 to buffer the ore.

[0046] In some embodiments, a second belt conveyor 24 is further installed at the lower portion of the second heavy-duty apron feeder 23 for conveying processed ore.

[0047] In an embodiment of the present invention, the auxiliary feeding station 2 further comprises a second oil hammer 25 , which crushes the ore on the second grizzly screen 21 so that the ore passes through the second grizzly screen 21 and enters the second heavy-duty plate feeder 23 .

[0048] In some embodiments, ore, primarily fine ore, is transported to the second raw ore bin 22 of the auxiliary feeding station 2. After pre-screening by the second grating screen 21, the material below the sieve is of acceptable particle size. The material above the grating screen is further crushed by the second oil hammer 25 before being fed back into the auxiliary feeding system. The particle size of the qualified material after processing by the crushing station 100 is less than 275 mm.

[0049] In an embodiment of the present invention, the discharge end of the pre-screening system 4 includes an upper screen outlet and an lower screen outlet, the grinding system 5 includes a semi-autogenous mill 53, a coarse-grained screening device 54, a grinding slurry pump pool 58, a slurry pump 59, a fine-grained classification device 511, a ball mill 510, and a stone crushing system, the upper screen outlet of the pre-screening system 4 is connected to the feed end of the semi-autogenous mill 53, the lower screen outlet is connected to the feed end of the grinding slurry pump pool 58, the discharge end of the semi-autogenous mill 53 is connected to the feed end of the coarse-grained screening device 54, the discharge end of the coarse-grained screening device 54 includes an upper screen outlet and an lower screen outlet, the upper screen outlet of the coarse-grained screening device 54 is connected to the stone crushing The feed end of the crushing system is connected, the outlet of the under-sieve part of the coarse-grained screening device 54 is connected to the feed end of the grinding slurry pump pool 58, the discharge end of the grinding slurry pump pool 58 is connected to the feed end of the slurry pump 59, the discharge end of the slurry pump 59 is connected to the feed end of the fine-grained classification device 511, the discharge end of the fine-grained classification device 511 includes an upper outlet and a lower outlet, the upper outlet of the fine-grained classification device 511 is connected to the flotation system 6, the lower outlet of the fine-grained classification device 511 is connected to the feed end of the ball mill 510, the discharge end of the ball mill 510 is connected to the feed end of the grinding slurry pump pool 58, and the discharge end of the stubborn stone crushing system is connected to the feed end of the semi-autogenous mill 53.

[0050] In some embodiments, the material conveyed by the first belt conveyor and the second belt conveyor 24 is conveyed to the pre-screening equipment via the third belt conveyor 3, the material above the pre-screening equipment is conveyed to the semi-autogenous grinding mill 53 via the fourth belt conveyor 52, and the material below the screen is conveyed to the grinding slurry pump pool 58 through a pipeline.

[0051] In some embodiments, the coarse particle screening device 54 includes but is not limited to a linear vibrating screen or a cylindrical screen. The fine particle classification device generally adopts a hydrocyclone or a spiral classifier.

[0052] In some embodiments, the semi-autogenous mill 53 and the ball mill 510 of the grinding system 5 are arranged in a "one" shape, the coarse particle screening equipment 54 is installed directly below the discharge port of the semi-autogenous mill 53, the grinding slurry pump pool 58 is installed directly below the coarse particle screening equipment 54, and the fine particle classification equipment 511 is installed above the feed port of the ball mill 510.

[0053] In some embodiments, the discharge from the semi-autogenous grinding mill 53 flows by gravity to the coarse-grained screening device 54. The oversize material from the coarse-grained screening device 54 is conveyed to the rock crushing system via a fifth belt conveyor 55, and the undersize material is discharged to the grinding slurry pump tank 58. The material from the grinding slurry pump tank 58 is pumped by a slurry pump to the fine-grained classification device 511. The fine-grained classification device is provided with a sedimentation device that flows by gravity back to the ball mill 510. The discharge from the ball mill 510 flows by gravity to the grinding slurry pump tank 58, and the overflow can flow by gravity to the flotation system 6.

[0054] In some embodiments, the SAG mill 53 has an aspect ratio of 4.5:8.5, while the ball mill 510 has an aspect ratio of 10.2:6.2. Forged balls are used as grinding media in the SAG mill 53, with diameters of 120 mm, 100 mm, and 75 mm, respectively, with an initial charge weight ratio of 51:36:13. Cast balls are used as grinding media in the ball mill 510, with diameters of 60 mm, 40 mm, and 30 mm, respectively, with an initial charge weight ratio of 60:30:10.

[0055] In an embodiment of the present invention, the pebble crushing system includes a pebble bin 56 and a fine-grained crusher 51, the feed end of the pebble bin 56 is connected to the outlet of the above-screen part of the coarse-grained screening equipment 54, the discharge end of the pebble bin 56 is connected to the feed end of the fine-grained crusher 51, and the discharge end of the fine-grained crusher 51 is connected to the feed end of the semi-autogenous grinding mill 53.

[0056] In some embodiments, the fine-grain crusher 51 includes, but is not limited to, a cone crusher or an impact crusher. The rock bin 56 is mounted directly above the fifth belt conveyor 55. The material in the rock bin 56 enters the fine-grain crusher 51 via the sixth belt conveyor 57. The rock bin 56 is equipped with a level meter to enable interlocking control with the fine-grain crusher 51.

[0057] In the embodiment of the present invention, the pre-screening system 4 includes, but is not limited to, a ore washer, a drum screen, or a linear vibrating screen. Each of these ore washers, drum screens, or linear vibrating screens can pre-screen the ore. After pre-screening, material with a particle size less than 2 mm is fed into the grinding slurry pump pool 58, while material with a particle size of 2 mm or greater enters the grinding system 5.

[0058] The main function of pre-screening is to screen out the fine particles in the ore in advance, so that the materials that meet the classification requirements can be graded in the slurry pump pool, reduce the load of the semi-autogenous grinding mill, and improve the comprehensive production capacity of the grinding system. On the other hand, it can prevent fine particles from entering the grinding system and becoming slimy due to over-grinding.

[0059] There are three sources of materials for the grinding slag slurry pump pool: one is the undersize product of the pre-screening equipment, one is the undersize product of the coarse-particle screening equipment, and the other is the discharge of the ball mill. The grinding slag slurry pump pool generally controls the particle size to be 80% of the material less than 2mm. Therefore, the pre-screening equipment chooses 2mm, which is conducive to the subsequent fine-particle classification operation and improves the efficiency of the classification operation.

[0060] In some embodiments, the pre-screening process includes: crushed material from the crushing station 100 enters the pre-screening system 4, with the pre-screening cut-off particle size being 2 mm. After pre-screening, the oversize material has a particle size of +2 mm and passes through the fourth belt conveyor 52 to the semi-autogenous mill 53 for grinding. The undersize material has a particle size of -2 mm and enters the grinding slurry pump tank 58.

[0061] In some embodiments, the grinding and classification process includes: the pre-screened oversize material is ground in a semi-autogenous grinding mill 53. The ground material is then discharged to a coarse-size screening device 54, which cuts the particles into 15 mm particles. After screening, the oversize material, with a particle size of +15 mm, enters the rock crushing system; the undersize material, with a particle size of -15 mm, enters the grinding slurry pump tank 58. The material in the grinding slurry pump tank 58 is pumped by a slurry pump 59 to a fine-size classification device 511. After classification, the sediment is fed to a ball mill 510 for grinding, and the overflow (75% of the -0.074 mm particle size) enters a flotation system 6. The material after grinding in the ball mill 510 is also discharged to the grinding slurry pump tank 58.

[0062] In some embodiments, the rock crushing process is as follows: the material on the coarse particle screening device 54 enters the fine particle crusher 51, and the particle size of the material after crushing is P 80 =12mm, and the material returns to the grinding system 5 for re-grinding and classification.

[0063] The embodiment of the second aspect of the present invention provides a grinding process for processing ore, comprising the following steps:

[0064] (1) Ore with a particle size of 0 to 1000 mm is crushed by the main crushing station 1, and / or ore with a particle size of 0 to 300 mm is processed by the auxiliary feeding station 2 to obtain crushed ore, wherein the particle size of the crushed ore is less than 275 mm;

[0065] (2) The crushed ore enters the pre-screening system 4 for pre-screening, and the material with a size of not less than 2 mm enters the semi-autogenous grinding mill 53 for grinding, and the material with a size less than 2 mm enters the grinding slurry pump pool 58;

[0066] (3) The material from the semi-autogenous mill 53 is ground and then screened by the coarse particle screening device 54. The material with a particle size of not less than 15 mm enters the stone crushing system for processing, and the material with a particle size less than 15 mm enters the grinding slurry pump pool 58.

[0067] (4) The material entering the stone crushing system is crushed and then re-enters the semi-autogenous grinding mill 53 for grinding, and then returns to the above step (3);

[0068] (5) The material entering the grinding slurry pump pool (58) is sent to the fine-grained classification device (511) by the slurry pump (59) for classification. The upper outlet product of the fine-grained classification device (511) is overflow, and the overflow enters the flotation system (6), wherein the overflow has a particle size of less than 0.074 mm accounting for not less than 75%; the lower outlet product is sediment, and the sediment enters the ball mill (510) for grinding, wherein the sediment has a particle size of less than 0.074 mm accounting for 10% to 15%;

[0069] (6) The material entering the ball mill 510 is ground and then re-enters the grinding slurry pump pool 58, returning to step (5) until all the material enters the flotation system 6.

[0070] According to an embodiment of the present invention, the coarse-particle screening equipment mainly processes the semi-autogenous grinding mill grinding products and uses 15mm for screening, so that the coarse-particle ore above 15mm can enter the stubborn stone crushing system for crushing, achieving "more crushing and less grinding" and improving the grinding efficiency.

[0071] The composition of the fine particle size classification equipment can be adjusted. The reason why the classification is required to be carried out according to step (5) is mainly because the grinding classification is to provide qualified particle size materials for flotation to achieve sufficient monomer dissociation of minerals, and flotation generally requires that the proportion of materials with a particle size of less than 0.074 mm is not less than 75%.

[0072] Fine particle classification equipment generally adopts hydrocyclone or spiral classifier, which has high classification efficiency, compact equipment layout, small footprint and easy maintenance.

[0073] In the embodiment of the present invention, the material entering the pebble crushing system first enters the pebble bin 56 and then enters the fine-grained crusher 51 for crushing. The crushed material then re-enters the semi-autogenous grinding mill 53 for grinding.

[0074] Example

[0075] The following examples more particularly describe the present disclosure, and these examples are intended to be illustrative only, as various modifications and variations within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are by weight, and all reagents used in the examples are commercially available or synthesized according to conventional methods and used directly without further processing, and all instruments used in the examples are commercially available.

[0076] Example 1

[0077] The crushing and grinding process system of the present invention is used to process a copper-cobalt ore with an oxidation rate of 75%, a Mohs hardness of 8 to 10, and a bulk density of 1.77 t / m 3 The maximum particle size is 1000mm. The raw ore comes from the mine and is fed into the first raw ore bin 12 of the main crushing station 1 by a loader 7, with a supply rate of 250t / h. The size of the first grid screen 11 is 650mm*650mm. The undersize material is fed into the jaw crusher 14 through the first heavy plate feeder 13 and crushed to a qualified particle size; the material on the first grid screen 11 is further crushed to ≤650mm by an oil hammer and then fed into the main crushing station 1 again. The final ore particle size processed by the main crushing station 1 is ≤275mm, and is fed into the pre-screening system 4 in sequence through the first belt conveyor 15 and the third belt conveyor 3. The material on the screen is not less than 2mm and enters the semi-autogenous mill (53) for grinding, with an ore capacity of 200t / h; the material under the screen is less than 2mm. It enters the grinding slurry pump pool (58), with an ore capacity of 50t / h. After being processed by the grinding system, the overflow product entering the flotation system accounts for 75% -0.074mm, and the ore output is 250t / h.

[0078] Example 2

[0079] The crushing and grinding process system of the present invention is used to process a copper-cobalt ore with an oxidation rate of 75%, a Mohs hardness of 8 to 10, and a bulk density of 1.77 t / m 3The maximum particle size is 300mm. The raw ore comes from the fine-grained ore preparation yard near the crushing station 100 and is fed into the second raw ore bin 22 of the auxiliary feeding system by a loader 7, with a supply rate of 280t / h. The size of the second grid screen 21 is 200mm*200mm, and the material below the screen is the qualified particle size; the material above the second grid screen 21 is further crushed to ≤200mm by an oil hammer and then fed into the auxiliary feeding system again. The final ore particle size processed by the auxiliary feeding system is ≤275mm, and is fed into the pre-screening system 4 in sequence by the second belt conveyor 24 and the third belt conveyor 3. The material above the screen with a particle size of not less than 2mm enters the semi-autogenous mill (53) for grinding, with a ore capacity of 200t / h; the material below the screen with a particle size of less than 2mm enters the grinding slurry pump pool (58), with a ore capacity of 80t / h. After being processed by the grinding system, the overflow product entering the flotation system accounts for 75% -0.074mm, and the ore output is 280t / h.

[0080] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner as long as no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. An ore crushing and grinding system, characterized in that: The invention comprises a crushing station (100), a pre-screening system (4) and a grinding system (5), wherein the crushing station (100) comprises a main crushing station (1) and an auxiliary feeding station (2), wherein the main crushing station (1) and the auxiliary feeding station (2) are both connected to the feed end of the pre-screening system (4), the discharge end of the pre-screening system (4) is connected to the feed end of the grinding system (5), and the discharge end of the grinding system (5) is connected to the flotation system (6). The main crushing station (1) and the auxiliary feeding station (2) are vertically or approximately vertically distributed on the same plane. The main crushing station (1) crushes ore with a particle size of 0 to 1000 mm to less than 275 mm, and the auxiliary feeding station (2) crushes ore with a particle size of 0 to 300 mm to less than 275 mm. The main crushing station (1) comprises a first raw ore bin (12), a first grid screen (11), a first heavy plate feeder (13), and a jaw crusher (14); the first grid screen (11) performs a primary screening on the ore entering the first raw ore bin (12), so that the ore under the screen directly enters the first heavy plate feeder (13) and the jaw crusher (14) in sequence; The auxiliary feeding station (2) comprises a second raw ore bin (22), a second grid screen (21) and a second heavy-duty plate feeder (23); the second grid screen (21) performs a primary screening on the ore entering the second raw ore bin (22), so that the ore under the screen directly enters the second heavy-duty plate feeder (23); The discharge end of the pre-screening system (4) includes an outlet for the upper portion of the screen and an outlet for the lower portion of the screen; The grinding system (5) includes a semi-autogenous mill (53), a coarse-grained screening device (54), a grinding slurry pump pool (58), a slurry pump (59), a fine-grained classification device (511), a ball mill (510), and a stubborn stone crushing system. The outlet of the upper screen portion of the pre-screening system (4) is connected to the feed end of the semi-autogenous mill (53), the outlet of the lower screen portion is connected to the feed end of the grinding slurry pump pool (58), and the discharge end of the semi-autogenous mill (53) is connected to the feed end of the coarse-grained screening device (54). The discharge end of the coarse-grained screening device (54) includes an upper screen portion outlet and an underscreen portion outlet, the upper screen portion outlet of the coarse-grained screening device (54) is connected to the feed end of the stubborn stone crushing system, the underscreen portion outlet of the coarse-grained screening device (54) is connected to the feed end of the grinding slurry pump pool (58), the discharge end of the grinding slurry pump pool (58) is connected to the feed end of the slurry pump (59), and the discharge end of the slurry pump (59) is connected to the feed end of the fine-grained classification device (511). The discharge end of the fine-grained classification device (511) includes an upper outlet and a lower outlet, the upper outlet of the fine-grained classification device (511) is connected to the flotation system (6), the lower outlet of the fine-grained classification device (511) is connected to the feed end of the ball mill (510), and the discharge end of the ball mill (510) is connected to the feed end of the grinding slag slurry pump pool (58). The discharge end of the pebble crushing system is communicated with the feed end of the semi-autogenous grinding mill (53).

2. The ore crushing and grinding system according to claim 1, characterized in that: The main crushing station (1) further comprises a first oil hammer (16), which crushes the ore on the first grid screen (11) so that the ore passes through the first grid screen (11) and enters the first heavy plate feeder (13) and the jaw crusher (14) in sequence.

3. The ore crushing and grinding system according to claim 1, characterized in that: The auxiliary feeding station (2) further comprises a second oil hammer (25) for crushing the ore on the second grid screen (21) so that the ore passes through the second grid screen (21) and enters the second heavy plate feeder (23).

4. The ore crushing and grinding system according to claim 1, characterized in that: The pebble crushing system includes a pebble bin (56) and a fine-grained crusher (51), wherein the feed end of the pebble bin (56) is connected to the outlet of the upper screen portion of the coarse-grained screening device (54), the discharge end of the pebble bin (56) is connected to the feed end of the fine-grained crusher (51), and the discharge end of the fine-grained crusher (51) is connected to the feed end of the semi-autogenous grinding mill (53).

5. The ore crushing and grinding system according to claim 1, characterized in that: The pre-screening system (4) includes a ore washer, a cylindrical screen or a linear vibrating screen.

6. A ore grinding process, characterized in that: The steps include: (1) ore with a particle size of 0 to 1000 mm is crushed by a main crushing station (1), and / or ore with a particle size of 0 to 300 mm is crushed by an auxiliary feeding station (2), to obtain crushed ore, wherein the particle size of the crushed ore is less than 275 mm; (2) The crushed ore enters the pre-screening system (4) for pre-screening, and the material with a size of not less than 2 mm enters the semi-autogenous mill (53) for grinding, and the material with a size less than 2 mm enters the grinding slurry pump pool (58); (3) The material of the semi-autogenous mill (53) is ground and then screened by a coarse particle screening device (54). The material with a particle size of not less than 15 mm enters the stone crushing system for processing, and the material with a particle size less than 15 mm enters the grinding slurry pump pool (58); (4) The material entering the stone crushing system is crushed and then re-enters the semi-autogenous grinding mill (53) for grinding, and then returns to the above step (3); (5) The material entering the grinding slurry pump pool (58) is sent to the fine-grained classification device (511) by the slurry pump (59) for classification. The upper outlet product of the fine-grained classification device (511) is overflow, and the overflow enters the flotation system (6), wherein the overflow has a particle size of less than 0.074 mm accounting for not less than 75%; the lower outlet product is sediment, and the sediment enters the ball mill (510) for grinding, wherein the sediment has a particle size of less than 0.074 mm accounting for 10% to 15%; (6) The material entering the ball mill (510) is ground and then re-enters the grinding slurry pump pool (58), returning to step (5) until all the material enters the flotation system (6).

7. The ore crushing and grinding process according to claim 6, characterized in that: The material entering the pebble crushing system first enters the pebble bin (56), then enters the fine-grained crusher (51) for crushing, and the crushed material re-enters the semi-autogenous grinding mill (53) for grinding.

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