CN111921697A - Method and equipment for complex copper-lead-zinc sulphide ore crushing and grinding process - Google Patents
Method and equipment for complex copper-lead-zinc sulphide ore crushing and grinding process Download PDFInfo
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Abstract
A method and equipment for complex copper-lead-zinc sulphide ore crushing and grinding process. The invention comprises the following steps: feeding the coarsely crushed materials into a linear vibrating screen by a jaw crusher, feeding the oversize materials into a cone crusher for crushing, and then merging the coarsely crushed materials to form a closed-loop system, and feeding the undersize materials into a bin; the material in the storage bin is fed into the micro-powder sieve, the material on the sieve is fed into the high-pressure roller mill for super fine crushing and then returns to the micro-powder sieve for feeding to form a closed system, and the material under the sieve is a final crushed product. A three-section two-closed-circuit process is formed by a jaw crusher, a cone crusher, a high-pressure roller mill, a linear vibrating screen and a micro-powder screen, so that the ore crushing process is strengthened, the granularity of ore grinding materials is reduced, and the final crushed product P95 can be controlled to be 1-2 mm; the first stage grinding adopts a tower mill and a hydrocyclone to form a closed circuit. The ore is treated by the three-section two-closed-circuit superfine crushing combined tower grinding process, and the fineness of the finally floating material can be controlled to be more than or equal to 85 percent in the-0.074 mm grade.
Description
The technical field is as follows:
the invention relates to a method and equipment for a complex copper-lead-zinc sulphide ore crushing and grinding process.
Background art:
flotation is the most common method for purifying and processing minerals, and crushing and grinding are firstly carried out before ores enter flotation operation, so that useful minerals are dissociated in a single body. For a long time, the crushing and grinding operation is always the most important energy consumption link of a concentrating mill, and can account for 40% -70% of the total production power consumption, and particularly, the grinding operation has the defects of obviously high investment, high power consumption, low energy utilization rate and the like. With the trend of mineral resources towards poor, miscellaneous and fine, the innovation of the grinding process, the matching of high-efficiency energy-saving equipment and the effective reduction of the production cost of complex refractory ores become more and more industrial research hotspots.
At present, the most common crushing and grinding process in copper-lead-zinc polymetallic sulphide ore mines is a multi-stage crushing-ball milling process. According to the different geological characteristics of ores, natural endowment states of minerals, mineral separation process parameters and concentrate indexes, crushing operation generally comprises coarse crushing by a jaw crusher, crushing and fine crushing in a cone crusher, and a closed circuit is formed by matching with a vibrating screen, wherein the granularity of a final crushed product is-12.00 mm; the ore grinding operation generally adopts a one-stage (two-stage) ball mill and a spiral classifier configuration. The multistage crushing and ball milling process is still the most widely applied and technically mature process at present, but has the defects of more process links, large occupied area of a factory building, noise and dust pollution, high power consumption of unit ore, high production cost and the like, and taking a ball mill as an example, the loss of a lining plate and a medium of the ball mill accounts for more than 90 percent of the total loss cost of a plant. With the gradual depletion and the complication of resources, the traditional multi-stage crushing-ball milling process cannot meet the requirements of mine enterprises on energy conservation, consumption reduction and income improvement.
The invention content is as follows:
the invention aims to provide a method and equipment for a complex copper-lead-zinc sulphide ore crushing and grinding process.
The above purpose is realized by the following technical scheme:
an efficient energy-saving crushing and grinding process method for complex copper-lead-zinc sulfide ores comprises the following steps:
feeding the massive ore into a jaw crusher for coarse crushing, feeding the coarse crushed material into a linear vibrating screen through a first belt conveyor, feeding the material on the screen of the linear vibrating screen into a cone crusher for crushing through a second belt conveyor, and merging the medium crushed material into the belt conveyor; feeding the materials screened by the linear vibrating screen into a storage bin through a third belt conveyor for stacking, and then entering the step (2);
step (2), the material piled in the storage bin in the step (1) is sent into a micro-powder sieve through a large-inclination-angle belt conveyor IV, the material on the micro-powder sieve is sent into a high-pressure roller mill for superfine grinding through a large-inclination-angle belt conveyor V, and the superfine grinding material is merged into the large-inclination-angle belt conveyor IV; feeding the materials screened by the micro-powder sieve into the step (3);
feeding the material sieved by the micro-powder sieve in the step (2) into a tower mill for grinding through a large-inclination-angle belt conveyor six; the primary grinding ore pulp enters a hydrocyclone, the underflow of the hydrocyclone returns to a tower mill, and the overflow of the hydrocyclone is fed into an ore pulp stirring barrel.
In the process method for efficiently and energy-saving crushing and grinding the complex copper-lead-zinc sulfide ore, the first-stage ore grinding adopts a tower mill and a hydrocyclone to form a closed-circuit ore grinding system.
The complex copper-lead-zinc sulphide ore high-efficiency energy-saving crushing and grinding process method has the advantage that the granularity of the medium crushed product is less than or equal to 60.00 mm.
According to the high-efficiency energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore, the particle size of the coarse crushing product is less than or equal to 100.00 mm.
The complex copper-lead-zinc sulphide ore high-efficiency energy-saving crushing and grinding process method has the advantage that the granularity of the superfine crushed product is less than or equal to 5.00 mm.
An apparatus used in the high-efficiency energy-saving crushing and grinding process method of the complex copper-lead-zinc sulphide ore according to any one of the claims 1 to 5,
the raw material bin is used for storing blocky ores, a disc ore feeder is arranged at the outlet of the raw material bin, and a jaw crusher is arranged at the discharge outlet of the disc ore feeder;
the belt conveyor is used for conveying materials of the jaw crusher, the cone crusher and the linear vibrating screen;
the belt conveyor is used for conveying materials of the cone crusher and the linear vibrating screen;
the linear vibrating screen conveys materials to a feeding bin through a third belt conveyor;
a disc feeder is arranged at the outlet of the storage bin;
the belt conveyor is used for conveying materials of the disc ore feeder, the high-pressure roller mill and the micro-powder sieve;
the micro powder sieve conveys the materials to a buffer bin through a large-inclination-angle belt conveyor five, and a high-pressure roller mill is arranged at an outlet of the buffer bin;
the micro powder sieve conveys the materials to a tower mill through a large-inclination-angle belt conveyor six, and a high-pressure roller mill is arranged at an outlet of the buffer bin;
the tower mill conveys materials to an overflow slurry pool, the overflow slurry pool conveys the materials to a hydrocyclone through a slurry pump, and the hydrocyclone conveys the materials to the tower mill respectively.
The equipment used in the high-efficiency energy-saving crushing and grinding process method of the complex copper-lead-zinc sulphide ore is characterized in that an iron remover is arranged on the first belt conveyor and the fifth belt conveyor with large inclination angles.
The equipment used in the high-efficiency energy-saving crushing and grinding process method of the complex copper-lead-zinc sulphide ore is characterized in that the linear vibrating screen is used for dry screening, and the size of a screen hole is less than or equal to 20.00 mm.
The equipment used in the efficient energy-saving crushing and grinding process method of the complex copper-lead-zinc sulphide ore is characterized in that the fine sieve is screened in a dry mode, and the size of the sieve pore is less than or equal to 1.50 mm.
The invention has the beneficial effects that:
the invention changes the traditional high-energy consumption crushing and grinding process of multi-section crushing and ball milling of copper-lead-zinc multi-metal sulfide ores, and provides a most efficient and energy-saving crushing and grinding process of an ultra-fine crushing combined tower mill for poor, miscellaneous and fine complex sulfide ores.
According to the invention, the dry closed-circuit ore crushing system is composed of the high-pressure roller mill and the micro-powder sieve, so that the problems of high pump energy consumption, serious pump and pipeline abrasion and the like caused by part of wet-type screening operation are avoided, and the arrangement of plant equipment is simplified; the maximum granularity limit of the crushed product is reduced, more crushing and less grinding are fully realized, the unit power consumption of the ore is effectively reduced, and the possibility of improving the productivity of the plant selection is provided; the high-pressure roller mill is introduced to carry out superfine crushing operation, a large number of microcracks are generated on the surface of crushed material particles and in the particles, the grindability of the material is improved, and the operation power consumption of a subsequent ore grinding system is effectively reduced.
The tower mill and the hydrocyclone form a wet closed circuit grinding system, the grinding medium adopts ceramic balls, when the ground product is 85% in a size of-0.074 mm, the loss of the unit ore medium is only one ten thousandth, and compared with a ball mill, the wet closed circuit grinding system has the advantages of low operation energy consumption, strong processing capacity, high product fineness, stable and easily controlled production and the like; the method has good adaptability to the polymetallic ores embedded with fine and connected impurities, can realize effective separation of useful minerals, and improves the mineral separation recovery rate.
The invention has simple equipment connection, convenient plant layout and low investment. Due to the adoption of novel equipment, the automatic control is easy to realize, the production is stable, the dust is less, the noise is low, and the occupational disease risk of practitioners is reduced.
Description of the drawings:
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic structural view of the process equipment of the present invention.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a method for a crushing and grinding process of complex copper-lead-zinc sulphide ores, wherein the ore feeding amount is 35 tons per hour, the maximum size of a massive ore is 350.00mm, and the ore is easier to grind than a standard ore.
Step (1), a groove type ore feeder 18 is arranged at the bottom of a raw ore bin 1, ores enter a jaw crusher 11 to be coarsely crushed, the particle size of a coarsely crushed product is less than or equal to 100.00mm, the coarsely crushed product is fed into a linear vibrating screen 13 through a belt conveyor I5 to be screened, and the size of a screen hole is 12.00 mm. Feeding the oversize material into a cone crusher through a second belt conveyor 6 for crushing, wherein the granularity of the medium crushed product is less than or equal to 60.00mm, and merging the medium crushed product into a first belt conveyor 5 to form a closed system with the system cyclic load of 140%; and the materials screened by the linear vibrating screen 13 are sent into a storage bin through a third belt conveyor 7 for stacking.
And (2) arranging a disc feeder 19 at the bottom of the stacking bin 2, and feeding the disc feeder into the fine powder sieve 15 through a large-inclination-angle belt conveyor four 8, wherein the size of a sieve pore is 1.00 mm. Materials on the sieve of the micro-powder sieve 15 are sent into the high-pressure roller mill 14 for superfine grinding through the large-inclination-angle belt conveyor five 9, the granularity of superfine grinding products is less than or equal to 5.00mm, the superfine grinding products are merged into the large-inclination-angle belt conveyor four 8 to form a closed system, and the circulating load of the system is 260%. The high-pressure roller mill 14 has a load roller gap of 15.00mm, a roller surface speed of 0.87m/s, a load current of 160A and a material column height of 3000.0 mm.
And (3) feeding the material sieved by the micro-powder sieve into a tower mill for grinding through a No.6 large-inclination-angle belt conveyor, feeding ore pulp into a hydrocyclone, returning the underflow of the hydrocyclone to the tower mill to form a closed system, wherein the circulating load of the system is 200%, and the overflow of the hydrocyclone is fed into an ore pulp stirring barrel for subsequent flotation operation. The concentration of ore grinding of the tower mill is 55 percent, the rotating speed of the shaft is 45 percent, the medium ball is an alumina ball, the filling rate is 60 percent, and the ore grinding time is 50 min.
The composition of the overflow grain size produced by the ultrafine grinding three-stage two-closed-circuit one-stage tower mill grinding process is shown in table 1.
TABLE 1 Ore grinding overflow size screen analysis
Feeding the coarsely crushed materials into a linear vibrating screen by a jaw crusher, feeding the oversize materials into a cone crusher for crushing, and then merging the coarsely crushed materials to form a closed-loop system, and feeding the undersize materials into a bin; the material in the storage bin is fed into the micro-powder sieve, the material on the sieve is fed into the high-pressure roller mill for super fine crushing and then returns to the micro-powder sieve for feeding to form a closed system, and the material under the sieve is a final crushed product. A three-section two-closed-circuit process is formed by a jaw crusher, a cone crusher, a high-pressure roller mill, a linear vibrating screen and a micro-powder screen, so that the ore crushing process is strengthened, the granularity of ore grinding materials is reduced, and the final crushed product P95 can be controlled to be 1-2 mm; the first stage grinding adopts a tower mill and a hydrocyclone to form a closed circuit. The ore is treated by the three-section two-closed-circuit superfine crushing combined tower grinding process, and the fineness of the finally floating material can be controlled to be more than or equal to 85 percent in the-0.074 mm grade.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An efficient energy-saving crushing and grinding process method for complex copper-lead-zinc sulfide ores is characterized by comprising the following steps:
the method comprises the following steps that (1) lump ore is fed into a jaw crusher (11) to be coarsely crushed, coarsely crushed materials are fed into a linear vibrating screen (13) through a belt conveyor I (5), oversize materials on the linear vibrating screen (13) are fed into a cone crusher (12) through a belt conveyor II (6) to be crushed, and middle crushed materials are merged into the belt conveyor (5); feeding the undersize material of the linear vibrating screen (13) into a storage bin (2) through a belt conveyor III (7) for piling, and then entering the step (2);
step (2), the material stockpiled in the bin (2) in the step (1) is sent into a micropowder screen (15) through a large-inclination-angle belt conveyor IV (8), the material on the micropowder screen (15) is sent into a high-pressure roller mill (14) for superfine grinding through a large-inclination-angle belt conveyor V (9), and the superfine grinding material is merged into the large-inclination-angle belt conveyor IV (8); feeding the undersize material of the micropowder sieve (15) into the step (3);
step (3), feeding the undersize material of the fine powder sieve (15) in the step (2) into a tower mill (16) for grinding through a large-inclination-angle belt conveyor six (10); the primary grinding ore pulp enters a hydrocyclone (17), the underflow of the hydrocyclone (17) returns to a tower mill (16), and the overflow of the hydrocyclone (17) is fed into an ore pulp stirring barrel (4).
2. The efficient energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore according to claim 1, wherein the first-stage ore grinding adopts a tower mill (16) and a hydrocyclone (17) to form a closed-circuit ore grinding system.
3. The efficient energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore according to claim 1, wherein the granularity of the medium crushed product is less than or equal to 60.00 mm.
4. The efficient energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore according to claim 1, wherein the granularity of the coarse crushing product is less than or equal to 100.00 mm.
5. The efficient energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore according to claim 1, wherein the granularity of the superfine crushed product is less than or equal to 5.00 mm.
6. An apparatus used in the high-efficiency energy-saving crushing and grinding process method of the complex copper-lead-zinc sulphide ore according to any one of the claims 1 to 5,
the raw material bin (1) is used for storing blocky ores, a disc ore feeder (18) is arranged at the outlet of the raw material bin (1), and a jaw crusher (11) is arranged at the discharge outlet of the disc ore feeder (18);
the first belt conveyor (5) is used for conveying materials of the jaw crusher (11), the cone crusher (12) and the linear vibrating screen (13);
the second belt conveyor (6) is used for conveying materials of the cone crusher (5) and the linear vibrating screen (13);
the linear vibrating screen (13) conveys materials to the feeding bin (2) through a third belt conveyor (7);
the outlet of the silo (2) is provided with a disc feeder (19);
the belt conveyor four (8) is used for conveying the materials of the disc feeder (19), the high-pressure roller mill (14) and the fine powder screen (15);
the fine powder sieve (15) conveys the materials to a buffer bin (21) through a large-inclination-angle belt conveyor five (9), and a high-pressure roller mill (14) is arranged at the outlet of the buffer bin (21);
the fine powder screen (15) conveys the materials to a tower mill (16) through a large-inclination-angle belt conveyor six (10), and a high-pressure roller mill (14) is arranged at the outlet of the buffer bin (21);
the tower mill (16) conveys materials to the overflow slurry pool (3), the overflow slurry pool (3) conveys the materials to the hydrocyclone (17) through the slurry pump (20), and the hydrocyclone (17) conveys the materials to the tower mill (16) respectively.
7. The equipment used in the high-efficiency energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore according to the claim 6 is characterized in that the first belt conveyor (5) and the fifth belt conveyor (9) with large inclination are provided with iron removers.
8. The equipment used in the high-efficiency energy-saving crushing and grinding process method for the complex copper-lead-zinc sulphide ore according to the claim 6, wherein the linear vibrating screen (13) is a dry type screen with the screen hole size less than or equal to 20.00 mm.
9. The equipment used in the high-efficiency energy-saving crushing and grinding process method for the complex copper-lead-zinc sulfide ore according to claim 6, wherein the fine powder sieve (15) is screened in a dry mode, and the size of a sieve pore is less than or equal to 1.50 mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112827616A (en) * | 2020-12-22 | 2021-05-25 | 江阴市顺通工程机械有限公司 | Vibration screening system |
| CN113102080A (en) * | 2021-04-20 | 2021-07-13 | 东北大学 | A two-stage series high-pressure roller mill-stirring mill short-flow grinding system and method thereof |
| CN115970851A (en) * | 2023-02-10 | 2023-04-18 | 沈阳盛世五寰科技有限公司 | Grinding-flotation short-flow separation method for treating fine-grained molybdenite |
| CN116273441A (en) * | 2023-03-06 | 2023-06-23 | 中国恩菲工程技术有限公司 | Platinum palladium ore beneficiation method and system |
| CN116966981A (en) * | 2023-07-28 | 2023-10-31 | 武汉海剑环保材料有限公司 | Device for manufacturing recycled concrete by using building solid waste |
| WO2024153015A1 (en) * | 2023-01-18 | 2024-07-25 | 中国恩菲工程技术有限公司 | Method and system for efficient ore crushing, grinding and sorting |
| CN119237146A (en) * | 2024-12-05 | 2025-01-03 | 湖南宝山有色金属矿业有限责任公司 | Dry separation and washing method of ore |
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