CN112473991A - Novel semi-autogenous grinding one-stage closed circuit grinding production process - Google Patents
Novel semi-autogenous grinding one-stage closed circuit grinding production process Download PDFInfo
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- CN112473991A CN112473991A CN202011317978.2A CN202011317978A CN112473991A CN 112473991 A CN112473991 A CN 112473991A CN 202011317978 A CN202011317978 A CN 202011317978A CN 112473991 A CN112473991 A CN 112473991A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
- B02C21/007—Disintegrating plant with or without drying of the material using a combination of two or more drum or tube mills
Abstract
The invention discloses a novel semi-autogenous grinding one-section closed circuit grinding production process, which comprises the following process steps: (1) semi-autogenous grinding and ball milling closed circuit grinding process; (2) the semi-autogenous grinding machine operates alone to form a semi-autogenous grinding first-stage closed circuit grinding process: s1, modification of the semi-autogenous mill: adding steel balls into the semi-autogenous mill, and allowing the maximum steel ball filling rate to reach 15%; s2, feeding ore to a semi-autogenous mill after the plate feeder is fully extruded; s3, grinding the minerals by a semi-autogenous grinding machine, and mixing and grinding the semi-autogenous grinding steel balls and the minerals; s4, discharging the material obtained in the step s3 through a semi-self grinding ball row after the grinding is completed; s5, conveying the mineral discharged in the step s4 to a hydrocyclone through a slurry pump; s6, after classifying and screening by the hydrocyclone, the qualified fraction enters the next flotation process as overflow, and the coarse fraction settled sand returns to the semi-autogenous grinding again to be continuously ground to form closed cycle. The invention can not only carry out the semi-autogenous grinding and ball milling closed circuit grinding process, but also transform the semi-autogenous grinding machine into a section of closed circuit grinding process used by the ball mill, has strong operation flexibility, and can save equipment and production cost.
Description
Technical Field
The invention belongs to the technical field of ore grinding processes, and particularly relates to a novel semi-autogenous grinding one-stage closed circuit ore grinding production process.
Background
The working principle of the autogenous mill is basically the same as that of a ball mill, except that the diameter of a cylinder is larger, and the crushed materials in the cylinder are used as media without balls or any other grinding media, so that the aim of grinding is achieved by continuously impacting and mutually grinding the materials in the cylinder. During the working process of the autogenous mill, ores with the diameters of less than 80mm and more than 20mm are not easy to grind, and at this time, a certain proportion of steel balls or steel rods are required to be added into the autogenous mill, and the ore grinding efficiency is greatly improved after the ore grinding media are added. This grinding apparatus was later developed to become a so-called semi-autogenous mill. These grinding media are usually added in relatively small amounts, accounting for only 8% of the useful volume of the autogenous mill.
With the continuous improvement of the semi-autogenous grinding technology, the application range is gradually expanded, and the semi-autogenous grinding technology is well known as a way for reducing the capital investment and the production cost of a concentrating mill. The overseas ore grinding experts think that the grinding tasks which are required to be completed by a plurality of sections of operations such as crushing, rod grinding and even ball milling are completed by concentrating one operation, namely one-section autogenous grinding or semi-autogenous grinding, which is not economical economically, the ore grinding efficiency is not high, and more people perform two-section operation. Therefore, the development trend of the semi-autogenous grinding technology is to use a semi-autogenous grinding machine and a ball mill to form an ore grinding process to provide raw materials for the next separation work.
However, the ball mill needs to be overhauled frequently, the overhauling time is more than two weeks each time, the whole ore grinding flow is interrupted during the overhauling period, and the normal operation is difficult to maintain only by the semi-autogenous mill, so that great loss and inconvenience are brought to production.
In conclusion, how to provide a novel semi-autogenous grinding one-section closed circuit grinding production process, which can perform a semi-autogenous grinding and ball milling closed circuit grinding process and a single semi-autogenous grinding one-section closed circuit grinding process, has strong operation flexibility, and can save equipment and production cost, and is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to solve the technical problems that the existing semi-autogenous grinding and ball milling closed circuit grinding process is easy to interrupt and has low flexibility and great loss is brought to production, and provides a novel semi-autogenous grinding one-section closed circuit grinding production process, which can be used for carrying out the semi-autogenous grinding and ball milling closed circuit grinding process and carrying out the independent semi-autogenous grinding one-section closed circuit grinding process, and has strong operation flexibility.
In order to achieve the purpose, the invention provides the following technical scheme: a novel semi-autogenous grinding one-section closed circuit grinding production process comprises a semi-autogenous grinding and ball milling closed circuit grinding process, when a ball mill needs to be maintained, the semi-autogenous grinding machine independently operates to form the semi-autogenous grinding one-section closed circuit grinding process:
s1, modification of the semi-autogenous mill: adding steel balls into the semi-autogenous mill to enable the maximum steel ball filling rate to reach 15%;
s2, feeding ore to a semi-autogenous mill after the plate feeder is fully extruded;
s3, grinding the minerals by a semi-autogenous grinding machine, and mixing and grinding the semi-autogenous grinding steel balls and the minerals;
s4, discharging the material obtained in the step s3 through a semi-self grinding ball row after the grinding is completed;
s5, conveying the minerals discharged in the step s4 to a hydrocyclone through a slurry pump after the minerals enter a pump pool;
s6, after classifying and screening by the hydrocyclone, the qualified fraction enters the next flotation process as overflow, and the coarse fraction settled sand returns to the semi-autogenous grinding again to be continuously ground to form closed cycle.
Further, the semi-autogenous grinding and ball milling closed circuit grinding process comprises the following process steps:
s1, feeding ore to a semi-autogenous mill after the plate feeder is fully extruded;
s2, grinding the minerals by a semi-autogenous grinding machine, and mixing and grinding a semi-autogenous grinding steel ball and the minerals;
s3, discharging the material obtained in the step S2 through a semi-self grinding ball row after the material is completely ground;
s4, after the minerals discharged in the step S3 are discharged into a pump pool, the minerals are conveyed to a hydrocyclone through a slurry pump;
and S5, after classifying and screening by the hydrocyclone, enabling qualified particle size to enter the next flotation process, enabling unqualified particle size to enter a semi-autogenous mill for continuous grinding, discharging the completely ground material into a pump pool, and enabling the completely ground material to enter the hydrocyclone again for classifying and screening.
Further, the plate feeder is connected with a semi-autogenous mill, the semi-autogenous mill is connected with a pump pool, the pump pool is connected with a slurry pump, the slurry pump is connected with a hydraulic cyclone, the hydraulic cyclone is respectively connected with a ball mill and the semi-autogenous mill, and the ball mill is also connected with the pump pool.
Furthermore, a first switch is arranged between the hydrocyclone and the ball mill, a second switch is arranged between the hydrocyclone and the semi-autogenous mill, and a third switch is arranged between the ball mill and the pump pool.
Further, in the semi-autogenous grinding and ball-milling closed circuit grinding process, the first switch and the third switch are in an open state, the second switch is in a closed state, and in the semi-autogenous grinding closed circuit grinding process formed by the independent operation of the semi-autogenous grinding machine, the first switch and the third switch are in a closed state, and the second switch is in an open state. By controlling the three switches, the semi-autogenous grinding and ball mill closed circuit grinding process and the semi-autogenous grinding closed circuit grinding process can be switched at will, and the operation flexibility is strong.
Furthermore, the diameter of the filled steel ball of the semi-autogenous mill is any combination of 60 mm-80 mm and 100 mm-110 mm, so that the effect of semi-autogenous milling and one-section closed-circuit fine milling is enhanced.
Further, the size of the semi-autogenous mill is 4000 x 3600.
Further, the slurry pump is a 150ZJA slurry pump.
Further, the hydrocyclone is FX660J hydrocyclone.
When a semi-autogenous grinding and ball milling closed-circuit grinding process is required, opening a first switch and a third switch, and closing a second switch to form a grinding process of a plate feeder, a semi-autogenous mill, a pump tank, a slurry pump, a hydrocyclone (classified screening), a ball mill and an ore tank, wherein the filling rate of the semi-autogenous mill is about 8 percent of the common specification; when the ball mill cannot be used during maintenance and a semi-autogenous mill closed circuit grinding process is required, firstly, steel balls are added into the semi-autogenous mill to enable the maximum filling rate of the steel balls to reach 15%, then the first switch and the third switch are closed, the second switch is opened, a plate type ore feeder, the semi-autogenous mill, a pump pool, a slurry pump, a hydrocyclone (classified screening) and a semi-autogenous mill first-stage closed circuit grinding production process are formed, and at the moment, the treatment capacity of the semi-autogenous mill is remarkably improved.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can be switched between the semi-autogenous grinding and ball milling closed circuit grinding process and the semi-autogenous grinding one-stage closed circuit grinding process at will, and the processes are not affected with each other, and the normal production state can be kept at any time;
(2) the invention has simple operation and strong flexibility by the design of the semi-autogenous grinding one-stage closed circuit grinding production process; the production efficiency is improved, and the production cost is saved.
Drawings
FIG. 1 is a flow chart of the operation of a novel semi-autogenous grinding one-stage closed circuit grinding production process provided by the invention;
FIG. 2 is a flow chart of semi-autogenous grinding and ball milling closed circuit grinding in the novel semi-autogenous grinding one-stage closed circuit grinding production process provided by the invention;
fig. 3 is a flow chart of semi-autogenous grinding closed circuit ore grinding in the novel semi-autogenous grinding one-stage closed circuit ore grinding production process provided by the invention.
Description of reference numerals:
1. the device comprises a plate feeder, 2, a semi-autogenous mill, 3, a ball mill, 4, a pump pool, 5, a slurry pump, 6, a hydraulic cyclone, 7, a first switch, 8, a second switch and 9, and a third switch.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 1, the invention provides a novel semi-autogenous grinding one-stage closed circuit grinding production process, wherein the connection relationship among all devices is as follows: plate feeder 1 connects semi-autogenous mill 2, semi-autogenous mill 2 connects pump sump 4, pump sump 4 connects sediment stuff pump 5, sediment stuff pump 5 connects hydrocyclone 6, hydrocyclone 6 connects ball mill 3 and semi-autogenous mill 2 respectively, ball mill 3 still connects pump sump 4.
A first switch 7 is arranged between the hydrocyclone 6 and the ball mill 3, a second switch 8 is arranged between the hydrocyclone 6 and the semi-autogenous mill 2, and a third switch 9 is arranged between the ball mill 3 and the pump pool 4.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a semi-autogenous grinding + ball milling closed circuit grinding process in a novel semi-autogenous grinding one-stage closed circuit grinding production process, which comprises the following process steps:
s1, feeding ore to a semi-autogenous mill 2 after the plate feeder 1 is fully extruded;
s2, grinding the minerals by a semi-autogenous grinding machine 2, and mixing and grinding the semi-autogenous grinding steel balls and the minerals;
s3, discharging the material obtained in the step S2 through a semi-self grinding ball row after the material is completely ground;
s4, after the minerals discharged in the step S3 are discharged into a pump pool 4, the minerals are conveyed to a hydrocyclone 6 through a slurry pump 5;
s5, after the hydrocyclone 6 is classified and screened, the qualified grade enters the next flotation process, the unqualified grade enters the semi-autogenous mill 2 to be continuously ground, and the material obtained by complete grinding is discharged into the pump pool 4 and enters the hydrocyclone 6 again to be classified and screened.
In the present embodiment, the first switch 7 and the third switch 9 are in an open state, and the second switch 8 is in a closed state. The diameters of the steel balls are 100mm and 110mm, and the filling rate of the semi-autogenous mill 2 is 8%.
The semi-autogenous mill 2 has a size of 4000 x 3600; the slurry pump 5 is a 150ZJA slurry pump; the hydrocyclone 6 is an FX660J hydrocyclone.
Example 2
As shown in fig. 1 and 3, the present embodiment provides a semi-autogenous grinding one-stage closed circuit grinding process in a novel semi-autogenous grinding one-stage closed circuit grinding production process, which includes the following process steps:
s1, modification of semi-autogenous mill 2: adding steel balls into the semi-autogenous mill 2 to ensure that the filling rate of the steel balls reaches 13%;
s2, feeding ore to a semi-autogenous mill 2 after the plate feeder 1 is fully extruded;
s3, grinding the minerals by a semi-autogenous grinding machine 2, and mixing and grinding the semi-autogenous grinding steel balls and the minerals;
s4, discharging the material obtained in the step s3 through a semi-self grinding ball row after the grinding is completed;
s5, conveying the minerals discharged in the step s4 to a hydrocyclone 6 through a slurry pump 5 after the minerals enter a pump pool 4;
s6, classifying and screening by the hydrocyclone 6, taking the qualified fraction as overflow to enter the next flotation process, and returning the coarse fraction settled sand to the semi-autogenous mill 2 again to continue grinding to form closed cycle.
In this embodiment, the first switch 7 and the third switch 9 are in the off state, and the second switch is in the on state. The diameters of the steel balls are 60mm and 100 mm.
Example 3
The present embodiment is different from embodiment 2 in that: s1, modification of semi-autogenous mill 2: and adding steel balls into the semi-automatic mill 2 to ensure that the maximum steel ball filling rate reaches 14 percent.
Example 4
The present embodiment is different from embodiment 2 in that: s1, modification of semi-autogenous mill 2: and adding steel balls into the semi-automatic mill 2 to ensure that the maximum steel ball filling rate reaches 15 percent.
Example 5
The present embodiment is different from embodiment 2 in that: the steel balls have diameters of 70mm and 105 mm.
Example 6
The present embodiment is different from embodiment 2 in that: the diameters of the steel balls are 80mm and 110 mm.
Comparative example 1
This comparative example differs from example 1 in that: in the production process, the semi-autogenous mill 2 is opened singly, and the ball mill 3 is closed.
Comparative example 2
This comparative example differs from example 1 in that: in the production process, the ball mill 3 is singly opened, and the semi-autogenous mill 2 is closed.
Comparative example 3
This comparative example differs from example 2 in that: the filling rate of the semi-autogenous mill 2 was 9%.
Comparative example 4
This comparative example differs from example 2 in that: the filling rate of the semi-autogenous mill 2 was 12%.
Comparative example 5
This comparative example differs from example 2 in that: the steel balls have diameters of 50mm and 90 mm.
Comparative example 6
This comparative example differs from example 2 in that: the diameters of the steel balls are 90mm and 120 mm.
The ore grinding process throughput of the above 8 sets of examples is shown in the following table:
according to the results, in the embodiments 2-6, after the semi-autogenous mill is modified to form a semi-autogenous milling first-stage closed-circuit milling process, the semi-autogenous mill can be independently used as a ball mill to operate, the ore milling treatment capacity is remarkably improved to 75 t/h at most, 70t/h at least is achieved, and the production effect of the initial semi-autogenous mill and ball milling closed-circuit milling process in the embodiment 1 is obviously better.
Wherein, the lowest ore grinding treatment capacity of the ordinary semi-autogenous grinding machine which is operated independently in the comparative example 1 is 30t/h, because the filling rate of the steel balls of the ordinary semi-autogenous grinding machine is only 8 percent, the filling rate is too low, the ball amount is small, the ore fine grinding effect cannot be achieved, and the flotation feed granularity cannot be met. The ore grinding treatment capacity of the ball mill which is operated independently in the comparative example 2 is also lower, and the production efficiency is only 20 t/h.
In comparative examples 3 and 4, after the filling rate of the semi-autogenous mill is changed, the ore grinding treatment capacity is increased, so that the steel ball filling rate of the semi-autogenous mill is in a standard range of 13-15% in a closed circuit ore grinding process of a semi-autogenous mill section.
In comparative examples 5 and 6, after the diameter of the filled steel ball of the semi-autogenous mill is changed, the ore grinding treatment capacity is reduced, and the ball diameter and the ball ratio are not adjusted, so that the diameter of the filled steel ball in the semi-autogenous mill in a section of closed-loop process is strictly controlled within the combination range of any one of 60 mm-80 mm and 100 mm-110 mm.
The invention has the beneficial effects that: the invention can be switched between the semi-autogenous grinding and ball milling closed circuit grinding process and the semi-autogenous grinding closed circuit grinding process at will, the operation is flexible, the cost is saved, the improved grinding treatment capacity is obviously improved, and the production efficiency is greatly improved.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or some technical features thereof can be replaced. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A novel semi-autogenous grinding one-stage closed circuit grinding production process comprises a semi-autogenous grinding and ball milling closed circuit grinding process, and is characterized in that: when the ball mill needs to be maintained, the semi-autogenous mill operates alone to form a semi-autogenous mill first-stage closed circuit grinding process:
s1, modification of the semi-autogenous mill: adding steel balls into the semi-autogenous mill, and allowing the maximum steel ball filling rate to reach 15%;
s2, feeding ore to a semi-autogenous mill after the plate feeder is fully extruded;
s3, grinding the minerals by a semi-autogenous grinding machine, and mixing and grinding the semi-autogenous grinding steel balls and the minerals;
s4, discharging the material obtained in the step s3 through a semi-self grinding ball row after the grinding is completed;
s5, conveying the minerals discharged in the step s4 to a hydrocyclone through a slurry pump after the minerals enter a pump pool;
s6, after classifying and screening by the hydrocyclone, the qualified fraction enters the next flotation process as overflow, and the coarse fraction settled sand returns to the semi-autogenous grinding again to be continuously ground to form closed cycle.
2. The novel semi-autogenous grinding one-stage closed circuit grinding ore production process according to claim 1, characterized in that: the semi-autogenous grinding and ball milling closed circuit grinding process comprises the following process steps:
s1, feeding ore to a semi-autogenous mill after the plate feeder is fully extruded;
s2, grinding the minerals by a semi-autogenous grinding machine, and mixing and grinding a semi-autogenous grinding steel ball and the minerals;
s3, discharging the material obtained in the step S2 through a semi-self grinding ball row after the material is completely ground;
s4, after the minerals discharged in the step S3 are discharged into a pump pool, the minerals are conveyed to a hydrocyclone through a slurry pump;
and S5, after classifying and screening by the hydrocyclone, enabling qualified size fractions to enter the next flotation process, enabling unqualified size fractions to enter a ball mill for grinding, discharging the materials obtained by complete grinding into a pump pool, and enabling the materials to enter the hydrocyclone again for classifying and screening.
3. The novel semi-autogenous grinding one-stage closed circuit grinding ore production process according to claim 1, characterized in that: the plate feeder is connected with a semi-autogenous mill, the semi-autogenous mill is connected with a pump pool, the pump pool is connected with a slurry pump, the slurry pump is connected with a hydraulic cyclone, the hydraulic cyclone is respectively connected with a ball mill and the semi-autogenous mill, and the ball mill is also connected with the pump pool.
4. The novel semi-autogenous grinding one-stage closed circuit grinding ore production process according to claim 3, characterized in that: a first switch is arranged between the hydrocyclone and the ball mill, a second switch is arranged between the hydrocyclone and the semi-autogenous mill, and a third switch is arranged between the ball mill and the pump pool.
5. The novel one-stage closed circuit grinding production process according to any one of claims 1 to 4, characterized in that: in the semi-autogenous grinding and ball milling closed circuit grinding process, the first switch and the third switch are in an open state, the second switch is in a closed state, in the semi-autogenous grinding one-stage closed circuit grinding process formed by the independent operation of the semi-autogenous grinding machine, the first switch and the third switch are in a closed state, and the second switch is in an open state.
6. The novel semi-autogenous grinding self-circulation production process according to claim 1, characterized in that: the diameter of the filling steel ball of the semi-autogenous mill is any combination of 60 mm-80 mm and 100 mm-110 mm.
7. The novel semi-autogenous grinding one-stage closed circuit grinding production process according to claim 1, characterized in that: the size of the semi-autogenous mill is 4000 x 3600.
8. The novel semi-autogenous grinding one-stage closed circuit grinding ore production process according to claim 1, characterized in that: the slurry pump is a 150ZJA slurry pump.
9. The novel semi-autogenous grinding one-stage closed circuit grinding ore production process according to claim 1, characterized in that: the hydrocyclone is an FX660J hydrocyclone.
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| US20050116077A1 (en) * | 2003-06-18 | 2005-06-02 | Metso Minerals Industries, Inc. | Mill liner profile |
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| CN103357491A (en) * | 2013-08-08 | 2013-10-23 | 中冶北方（大连）工程技术有限公司 | Automatic hard rock returning device with semi-automatic grinding machine |
| CN105251572A (en) * | 2015-10-25 | 2016-01-20 | 中国瑞林工程技术有限公司 | Novel ore grinding classification system and process |
| CN108187878A (en) * | 2017-12-29 | 2018-06-22 | 潘自维 | A kind of one and half closed circuit grinding grading techniques |
| CN208161808U (en) * | 2018-02-09 | 2018-11-30 | 都兰金辉矿业有限公司 | A kind of gold mine grinding classification system |
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2020
- 2020-11-23 CN CN202011317978.2A patent/CN112473991B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050116077A1 (en) * | 2003-06-18 | 2005-06-02 | Metso Minerals Industries, Inc. | Mill liner profile |
| CN1903442A (en) * | 2006-02-16 | 2007-01-31 | 中国恩菲工程技术有限公司 | Semi-automill ball-milling type ore grinding system and its control system |
| CN103357491A (en) * | 2013-08-08 | 2013-10-23 | 中冶北方（大连）工程技术有限公司 | Automatic hard rock returning device with semi-automatic grinding machine |
| CN105251572A (en) * | 2015-10-25 | 2016-01-20 | 中国瑞林工程技术有限公司 | Novel ore grinding classification system and process |
| CN108187878A (en) * | 2017-12-29 | 2018-06-22 | 潘自维 | A kind of one and half closed circuit grinding grading techniques |
| CN208161808U (en) * | 2018-02-09 | 2018-11-30 | 都兰金辉矿业有限公司 | A kind of gold mine grinding classification system |
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