CN109248776B - High-grade magnetic separation process - Google Patents
High-grade magnetic separation process Download PDFInfo
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- CN109248776B CN109248776B CN201811203775.3A CN201811203775A CN109248776B CN 109248776 B CN109248776 B CN 109248776B CN 201811203775 A CN201811203775 A CN 201811203775A CN 109248776 B CN109248776 B CN 109248776B
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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
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
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Abstract
The invention discloses a high-grade magnetic separation process, which comprises the following steps: (1) after the raw ore passes through the ore grinding stage, the raw ore is conveyed to the upper part of the magnetic roller through a nozzle with adjustable outlet thickness to enter a magnetic separation stage, concentrate adsorbed by the magnetic roller enters a concentrate bin, and tailings not adsorbed by the magnetic roller are subjected to a tailings detection stage; (2) in the tailing detection stage, if the content of magnetic mineral aggregate contained in the tailings exceeds a set value, the tailings are recycled into the ore grinding stage and mixed with the mineral aggregate after ore grinding, and meanwhile, the thickness of a nozzle outlet in the magnetic separation stage is reduced; (3) and (5) repeating the step (2) until the content of the magnetic mineral aggregate in the tailings is lower than a set value, and enabling the tailings to enter a tailing bin. The invention ensures the grade of the concentrate and has high recovery rate, and can select the proper thickness of the mineral aggregate for the mineral aggregate with specific particle size by combining the tailing detection stage and the nozzle with adjustable thickness, thereby being suitable for various mineral aggregates with different particle sizes and having wide application range.
Description
Technical Field
The invention belongs to the technical field of ore dressing, and particularly relates to a high-grade magnetic separation process.
Background
The existing mineral separation process is that mineral aggregate is sprayed to the front end of a magnetic roller from a nozzle, magnetic substances are adsorbed on a conveying belt by a strong magnetic roller by force and run together with the conveying belt until the magnetic substances are separated from the strong magnetic roller and fall into a fine aggregate bin, and unadsorbed impurities enter a tail aggregate bin. Although this kind of mode can avoid the mineral aggregate to pile up on the conveyer belt, however, consider ore dressing efficiency, the mineral aggregate has certain thickness when the nozzle blowout, the thickness of mineral aggregate itself can exert an influence to the ore dressing effect, this is because near strong magnetic drum surface magnetic field intensity is high, magnetic adsorption is strong, it is far away from strong magnetic drum surface, magnetic adsorption is weaker, that is, mineral aggregate thickness is big more, the mineral aggregate far away from strong magnetic drum receives magnetic force weak more, and mineral aggregate itself still has certain acceleration when the nozzle blowout, this makes the mineral aggregate far away from strong magnetic drum very easily break away from strong magnetic drum, and get into in the tailing. In the actual ore dressing process, the particle sizes of different mineral aggregates or different batches of the same mineral aggregate are different, the requirement on the thickness of the mineral aggregate is different, the thickness of the mineral aggregate cannot be adjusted by the existing magnetic separation process, and the ore dressing is usually carried out under the condition of larger mineral aggregate thickness, so that the grade of tailings is overhigh, and the recovery rate is low.
Disclosure of Invention
The invention aims to: the invention provides a high-grade magnetic separation process, aiming at the problems of overhigh grade and low recovery rate of tailings caused by incapability of adjusting the thickness of mineral aggregates and high mineral separation under the condition of larger mineral aggregate thickness in the existing magnetic separation process.
The technical scheme adopted by the invention is as follows:
a high-grade magnetic separation process comprises an ore grinding stage, a magnetic separation stage and a tailing detection stage, and comprises the following steps:
(1) after the raw ore passes through the ore grinding stage, the raw ore is conveyed to the upper part of the magnetic roller through a nozzle with adjustable outlet thickness to enter a magnetic separation stage, concentrate adsorbed by the magnetic roller enters a concentrate bin, and tailings not adsorbed by the magnetic roller are subjected to a tailings detection stage;
(2) in the tailing detection stage, if the content of magnetic mineral aggregate contained in the tailings exceeds a set value, the tailings are recycled into the ore grinding stage and mixed with the mineral aggregate after ore grinding, and meanwhile, the thickness of a nozzle outlet in the magnetic separation stage is reduced;
(3) and (5) repeating the step (2) until the content of the magnetic mineral aggregate in the tailings is lower than a set value, and enabling the tailings to enter a tailing bin.
The high-grade magnetic separation process detects the content of the magnetic mineral aggregate in the tailings in real time by additionally arranging a tailing detection stage, compares the content with a set value, and once the content exceeds the set value, indicates that the thickness of the mineral aggregate is too large, the mineral aggregate far away from a magnetic roller is weakly adsorbed by magnetic force and is separated from the magnetic roller, then recycles the tailings into an ore grinding stage, reduces the thickness of a nozzle outlet of the magnetic separation stage, namely reduces the thickness of the mineral aggregate, and repeats the steps until the content of the magnetic mineral aggregate in the tailings is within the set value. On one hand, the invention recycles the unqualified tailings and then feeds the recycled tailings into the ore grinding stage to ensure the grade of the concentrate, on the other hand, for the mineral aggregate with specific particle size, under the condition that the optimal magnetic separation thickness is not clear, the invention combines the tailings detection stage and the nozzle with adjustable thickness to select the proper mineral aggregate thickness, therefore, the invention can also be applied to various mineral aggregates with different particle sizes, and has wide application range.
Furthermore, in the step (2), the thickness of the outlet of the nozzle can be reduced by 1-5mm each time according to the grade of the mineral aggregate.
Further, in the step (2), the nozzle is composed of a lower baffle plate which is horizontally arranged and an upper baffle plate which is obliquely arranged and can rotate up and down around the top end at the bottom end, a nozzle outlet is formed between the bottom end of the upper baffle plate and the lower baffle plate, and the thickness of the nozzle outlet is adjusted by rotating the upper baffle plate.
Further, the one end that lower baffle is located the nozzle outlet also can be rotated from top to bottom around the other end, and like this, overhead gage and lower baffle can rotate simultaneously, and the angle is adjustable promptly for the clearance between nozzle and the magnetic drum is adjustable, and the ore dressing effect is better.
Further, in the step (2), the tailing detection stage comprises a detection bin, the detection bin is positioned in front of the nozzle, the top of the detection bin is provided with an electromagnet, and the electromagnet is connected with the top of the detection bin through a spring; the tension sensor is used for detecting the tension change of the spring. If the magnetic mineral aggregate content in the tailings is high, mineral aggregates adsorbed on the electromagnet are increased, the tension of the spring is increased, therefore, the set value corresponds to a certain tension value of the spring, the tension sensor detects the change of the tension of the spring to judge whether the magnetic mineral aggregate content in the tailings exceeds the set value, once the set value is exceeded, the electromagnet is powered off to lose the magnetic force, and the magnetic mineral aggregates are magnetically separated together with the tailings again.
Further, the device also comprises a controller, and the electromagnet and the tension sensor are electrically connected with the controller. Through setting up the controller, the signal transmission to the controller that tension sensor detected, if exceed the setting value, the controller then controls the electro-magnet outage, and the tailing is retrieved and is got into the ore grinding stage, if do not exceed the setting value, then the tailing gets into the tailing storehouse.
Further, go up the baffle accessible telescopic link and connect the motor, by its upper and lower rotation of motor control to make motor and controller electric connection, when then the tailing detects and surpasss the setting value, controller control motor starts, and the baffle rotates downwards on order to reduce nozzle outlet thickness on the motor control, and the electro-magnet circular telegram is controlled again to the controller afterwards to continue to detect the tailing after the mineral aggregate thickness reduces.
Furthermore, a first discharging pipe and a second discharging pipe can be connected to the tail portion of the detection bin, a first electromagnetic valve is arranged on the first discharging pipe, a second electromagnetic valve is arranged on the second discharging pipe, and the first electromagnetic valve and the second electromagnetic valve are both electrically connected with the controller. When the tailings are required to be recycled and fed into the ore grinding stage, the controller controls the second electromagnetic valve to be closed, the first electromagnetic valve to be opened, the first discharge pipe is connected with the conveying device, the tailings are conveyed to the ore grinding stage after being recycled, and the conveying device can be a spiral conveyor or other conveying devices. When the content of the magnetic mineral materials in the tailings is within a set value, the controller controls the first electromagnetic valve to be closed, the second electromagnetic valve to be opened, and the tailings enter the tailing bin through the second discharge pipe.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the high-grade magnetic separation process, the tailing detection stage is additionally arranged, the nozzle with the adjustable outlet thickness is arranged, on one hand, the unqualified tailings are recycled and then are repeatedly fed into the ore grinding stage, the grade of the concentrate is ensured, the recovery rate is high, on the other hand, for the mineral aggregate with the specific particle size, the proper mineral aggregate thickness can be selected by combining the tailing detection stage and the nozzle with the adjustable thickness under the condition that the optimal magnetic separation thickness is not clear, therefore, the high-grade magnetic separation process can also be applied to various mineral aggregates with different particle sizes, and the application range is wide;
2. the invention can automatically detect the tailings and automatically adjust the thickness of the mineral aggregate, has high automation degree and reduces the workload of mineral separation workers;
3. the invention can be suitable for wet-type concentration and also can be suitable for wind-power ore dressing.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
All features disclosed in this specification may be combined in any combination, except features and/or steps that are mutually exclusive.
The present invention will be described in detail with reference to fig. 1.
Example 1
A high-grade magnetic separation process comprises an ore grinding stage, a magnetic separation stage and a tailing detection stage, and comprises the following steps:
(1) after the raw ore passes through the ore grinding stage, the raw ore is conveyed to the upper part of the magnetic roller through a nozzle with adjustable outlet thickness to enter a magnetic separation stage, concentrate adsorbed by the magnetic roller enters a concentrate bin, and tailings not adsorbed by the magnetic roller are subjected to a tailings detection stage;
(2) in the tailing detection stage, if the content of magnetic mineral aggregate contained in the tailings exceeds a set value, the tailings are recycled into the ore grinding stage and mixed with the mineral aggregate after ore grinding, and meanwhile, the thickness of a nozzle outlet in the magnetic separation stage is reduced;
(3) and (5) repeating the step (2) until the content of the magnetic mineral aggregate in the tailings is lower than a set value, and enabling the tailings to enter a tailing bin.
The high-grade magnetic separation process detects the content of the magnetic mineral aggregate in the tailings in real time by additionally arranging a tailing detection stage, compares the content with a set value, and once the content exceeds the set value, indicates that the thickness of the mineral aggregate is too large, the mineral aggregate far away from a magnetic roller is weakly adsorbed by magnetic force and is separated from the magnetic roller, then recycles the tailings into an ore grinding stage, reduces the thickness of a nozzle outlet of the magnetic separation stage, namely reduces the thickness of the mineral aggregate, and repeats the steps until the content of the magnetic mineral aggregate in the tailings is within the set value. On one hand, the invention recycles the unqualified tailings and then feeds the recycled tailings into the ore grinding stage to ensure the grade of the concentrate, on the other hand, for the mineral aggregate with specific particle size, under the condition that the optimal magnetic separation thickness is not clear, the invention combines the tailings detection stage and the nozzle with adjustable thickness to select the proper mineral aggregate thickness, therefore, the invention can also be applied to various mineral aggregates with different particle sizes, and has wide application range.
Example 2
Based on the example 1, in the step (2), the thickness of the outlet of the nozzle can be reduced by 1-5mm each time according to the ore grade.
Example 3
Based on embodiment 1, in step (2), the nozzle is composed of a lower baffle plate which is horizontally arranged and an upper baffle plate which is obliquely arranged and can rotate up and down around the top end at the bottom end, a nozzle outlet is formed between the bottom end of the upper baffle plate and the lower baffle plate, and the thickness of the nozzle outlet is adjusted by rotating the upper baffle plate. In addition, the lower baffle plate is positioned at one end of the nozzle outlet and can rotate up and down around the other end, so that the upper baffle plate and the lower baffle plate can rotate simultaneously, namely the angle is adjustable, the gap between the nozzle and the magnetic roller is adjustable, and the mineral separation effect is better.
Example 4
Based on the embodiment 1, in the step (2), the tailing detection stage comprises a detection bin, the detection bin is positioned in front of the nozzle, the top of the detection bin is provided with an electromagnet, and the electromagnet is connected with the top of the detection bin through a spring; the tension sensor is used for detecting the tension change of the spring. If the magnetic mineral aggregate content in the tailings is high, mineral aggregates adsorbed on the electromagnet are increased, the tension of the spring is increased, therefore, the set value corresponds to a certain tension value of the spring, the tension sensor detects the change of the tension of the spring to judge whether the magnetic mineral aggregate content in the tailings exceeds the set value, once the set value is exceeded, the electromagnet is powered off to lose the magnetic force, and the magnetic mineral aggregates are magnetically separated together with the tailings again.
Example 5
Based on embodiment 4, still include the controller, electro-magnet and force sensor all with controller electric connection. Through setting up the controller, the signal transmission to the controller that tension sensor detected, if exceed the setting value, the controller then controls the electro-magnet outage, and the tailing is retrieved and is got into the ore grinding stage, if do not exceed the setting value, then the tailing gets into the tailing storehouse.
Example 6
Based on embodiment 5, go up the baffle accessible telescopic link and connect the motor, by its upper and lower rotation of motor control to make motor and controller electric connection, then when the tailing detected and surpassed the setting value, the controller control motor started, and the baffle is gone up in motor control rotates downwards in order to reduce nozzle outlet thickness, and the controller is controlled the electro-magnet circular telegram again afterwards, detects with the tailing after continuing to reduce the mineral aggregate thickness.
Example 7
Based on above-mentioned embodiment, can detect first discharging pipe and second discharging pipe of storehouse afterbody connection to set up first solenoid valve on first discharging pipe, set up the second solenoid valve on the second discharging pipe, first solenoid valve and second solenoid valve all with controller electric connection. When the tailings are required to be recycled and fed into the ore grinding stage, the controller controls the second electromagnetic valve to be closed, the first electromagnetic valve to be opened, the first discharge pipe is connected with the conveying device, the tailings are conveyed to the ore grinding stage after being recycled, and the conveying device can be a spiral conveyor or other conveying devices. When the content of the magnetic mineral materials in the tailings is within a set value, the controller controls the first electromagnetic valve to be closed, the second electromagnetic valve to be opened, and the tailings enter the tailing bin through the second discharge pipe.
The above description is an embodiment of the present invention. The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the protection scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (4)
1. A high-grade magnetic separation process comprises an ore grinding stage, a magnetic separation stage and a tailing detection stage, and is characterized by comprising the following steps:
(1) after the raw ore passes through the ore grinding stage, the raw ore is conveyed to the upper part of the magnetic roller through a nozzle with adjustable outlet thickness to enter a magnetic separation stage, concentrate adsorbed by the magnetic roller enters a concentrate bin, and tailings not adsorbed by the magnetic roller enter a tailing detection stage;
(2) in the tailing detection stage, if the content of magnetic mineral aggregate contained in the tailings exceeds a set value, the tailings are recycled into the ore grinding stage and are mixed with the mineral aggregate after ore grinding, and meanwhile, the thickness of a nozzle outlet in the magnetic separation stage is reduced by 1-5mm each time;
(3) and (5) repeating the step (2) until the content of the magnetic mineral aggregate in the tailings is lower than a set value, and enabling the tailings to enter a tailing bin.
2. The high-grade magnetic separation process according to claim 1, wherein in the step (2), the nozzle is composed of a lower baffle plate which is horizontally arranged and an upper baffle plate which is obliquely arranged and can rotate up and down around the top end at the bottom end, a nozzle outlet is formed between the bottom end of the upper baffle plate and the lower baffle plate, and the thickness of the nozzle outlet is adjusted by rotating the upper baffle plate.
3. The high-grade magnetic separation process according to claim 1, wherein in the step (2), the tailings detection stage comprises a detection bin, the detection bin is positioned in front of the nozzle, an electromagnet is arranged at the top of the detection bin, and the electromagnet is connected with the top of the detection bin through a spring; the tension sensor is used for detecting the tension change of the spring.
4. The high-grade magnetic separation process according to claim 3, further comprising a controller, wherein the electromagnet and the tension sensor are electrically connected to the controller.
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| CN201811203775.3A CN109248776B (en) | 2018-10-16 | 2018-10-16 | High-grade magnetic separation process |
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| CN201811203775.3A CN109248776B (en) | 2018-10-16 | 2018-10-16 | High-grade magnetic separation process |
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| CN109225624A (en) * | 2018-10-16 | 2019-01-18 | 何双江 | A kind of adjustable ore-dressing plant of mineral aggregate thickness and its ore-dressing technique |
| JP7355713B2 (en) * | 2020-07-16 | 2023-10-03 | 株式会社神戸製鋼所 | Pretreatment method for recovering valuable elements from secondary batteries and method for recovering valuable elements from secondary batteries |
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| CN2208982Y (en) * | 1994-10-12 | 1995-10-04 | 王国顺 | Electromagnetic concentrating machine |
| CN2666558Y (en) * | 2003-11-11 | 2004-12-29 | 鞍山科技大学 | Magnetic separator |
| CN101513624B (en) * | 2009-04-07 | 2011-04-20 | 李海军 | Improved direct current magnetic separator |
| CN102240597A (en) * | 2011-05-25 | 2011-11-16 | 大连金河铸造有限公司 | Casting sand magnetic separation device and method |
| CN202387550U (en) * | 2011-12-20 | 2012-08-22 | 鞍钢集团矿业公司 | Tailing discharge device for impulse vertical-ring high-gradient magnetic separation machine |
| CN103028489B (en) * | 2012-11-27 | 2015-07-01 | 鞍钢集团矿业公司 | Magnetic iron online detection and warning device in magnetite tailings |
| CN104128258A (en) * | 2014-07-16 | 2014-11-05 | 珠海蓝天地力投资控股有限公司 | Weathered sandy ilmenite magnetic-separator |
| CN204842218U (en) * | 2015-07-07 | 2015-12-09 | 何征徽 | Choice equipment of magnetic iron ore |
| CN205164941U (en) * | 2015-10-15 | 2016-04-20 | 哈尔滨市永恒鑫科技开发有限公司 | Sorting facilities based on strong magnet separator of permanent magnetism disk |
| CN105170319A (en) * | 2015-10-27 | 2015-12-23 | 张荣斌 | Magnetic separator for mines |
| CN105381872B (en) * | 2015-12-15 | 2017-10-31 | 吴振宇 | A kind of fan-shaped distributing device |
| CN105921272B (en) * | 2016-02-01 | 2018-04-24 | 沈阳隆基电磁科技股份有限公司 | A kind of Full-automatic magnetic suspension selecting machine |
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