CN110523532A - A kind of efficient magnetic iron ore milling method - Google Patents
A kind of efficient magnetic iron ore milling method Download PDFInfo
- Publication number
- CN110523532A CN110523532A CN201910771830.7A CN201910771830A CN110523532A CN 110523532 A CN110523532 A CN 110523532A CN 201910771830 A CN201910771830 A CN 201910771830A CN 110523532 A CN110523532 A CN 110523532A
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- China
- Prior art keywords
- magnetic separation
- ore
- iron ore
- product
- ball mill
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/20—Magnetic separation whereby the particles to be separated are in solid form
Abstract
The invention discloses a kind of efficient magnetic iron ore milling methods, magnetic iron ore including that will be delivered to-the 12mm of fine ore bin enters the first wet magnetic separation device and carries out a magnetic separation, concentrate after magnetic separation enters ball mill ore grinding, magnetite product after ore grinding feeds the second wet magnetic separation device and carries out secondary magnetic separation, the concentrate product of then secondary magnetic separation, which is raised to send to grading plant, carries out grading, coarse grain product after classification is back to ball mill ore grinding again, and the fine particle product that -74 μm of grades after classification account for 40% or more enters subsequent mill and is elected to be industry.It is an advantage of the invention that eliminating the influence of the gangue mineral of monomer dissociation and lean intergrowth to grinding efficiency, improves ore grinding of ore and recycle production capacity, reduce energy consumption and cost, increase benefit.
Description
Technical field
The present invention relates to ferrous metal technical field of beneficiation more particularly to a kind of efficient magnetic iron ore milling methods.
Background technique
It is general for the ore dressing of magnetic iron ore in technical field of beneficiation are as follows: crushing and screening -- dry type magnetic separation -- stage mill
Mine -- stage grading technique.It by broken magnetic iron ore, feeds in the ball mill of primary grinding, after ball mill ore grinding, uses
Classifying equipoment such as cyclone, spiral classifier etc. is classified, and the fine particle product after classification feeds down one of operation, coarse fraction
Product then returns to ball mill and re-starts ore grinding, to form the closed cycle of grind grading.
But in such a process, there is the largely gangue mineral of monomer dissociation and poor companies in ball mill original feed
Raw body, and among the back amount of classifying equipoment, there is also the gangues of the monomer dissociation of new output due to ore grinding effect
Mineral and lean intergrowth, these substances can all enter ball mill and carry out ore grinding, therefore largely affect ball mill ore grinding
The promotion of efficiency, has a direct impact Ball mill throughput, and energy consumption is high, at high cost.
Summary of the invention
The object of the invention is exactly to provide a kind of efficient to solve the problems, such as that existing grinding process low efficiency, energy consumption are high
Magnetic iron ore milling method, eliminate the influence of the gangue mineral of monomer dissociation and lean intergrowth to grinding efficiency, improve choosing
Mine factory ore grinding recycles production capacity, reduces energy consumption and cost, increases benefit.
To achieve the goals above, present invention employs following technical solutions:
A kind of efficient magnetic iron ore milling method, including the fine ore bin, ball mill and grading plant being sequentially connected, fine ore bin and ball
A first wet magnetic separation device for bulky grain sorting is connected between grinding machine, and one is connected between ball mill and grading plant
Second wet magnetic separation device.
The magnetic iron ore for being delivered to -12mm of fine ore bin enters the first wet magnetic separation device and carries out a magnetic separation, a magnetic separation
Concentrate afterwards enters ball mill ore grinding, and the magnetic iron ore after ore grinding feeds the second wet magnetic separation device and carries out secondary magnetic separation, and then two
The concentrate product of secondary magnetic separation, which is raised to send to grading plant, carries out grading, and the coarse grain product after classification is back to ball mill and regrinds
Mine, the fine particle product that -74 μm of grades account for 40% or more enter subsequent mill and are elected to be industry.
Further, the grading plant is cyclone or spiral classifier.
Further, demagnetizer is set on the concentrate pipeline of the second wet magnetic separation device, for eliminating because of magnetic separation
And the magnetic coagulation phenomenon of the magnetic mineral generated, improve graded operation effect.
Further, the first wet magnetic separation device and the second wet magnetic separation device are middle high field intensity bulky grain wet type magnetic
Select machine.
In technical solution of the present invention, the tailing of a magnetic separation can also carry out straight line screening, be divided into size greater than 1.5mm's
Thick tailing and the thin tailing less than 1.5mm, on the one hand can reduce tailings discharging amount, on the other hand can be by the thick tailing of output
It is externally sold as building material product, increases benefit income；By reasonably adjusting ore grinding, classification and the device configuration of magnetic separation, change
The process of grind grading circulation realizes that mill selects the promotion of efficiency, so reach increase dressing plant's production capacity, reduce ore dressing at
Originally, increase the purpose of benefit.
Detailed description of the invention
Fig. 1 is to use a kind of efficient magnetic iron ore grinding process flow diagram of the invention.
Specific embodiment
Embodiment 1
For the present invention is more clearly understood, with reference to the accompanying drawing to a kind of efficient magnetic iron ore milling method of the invention into one
Step explanation, described herein the specific embodiments are only for explaining the present invention, is not intended to limit the present invention.
As shown in Figure 1, a kind of efficient magnetic iron ore ore grinding device, including the fine ore bin, ball mill and classification being sequentially connected
Device, it is characterised in that:
(1) between fine ore bin and ball mill connect one for coarse granule sorting the first wet magnetic separation device, ball mill and point
A second wet magnetic separation device for fine grained sorting is connected between stage arrangement；
(2) magnetic iron ore for being delivered to -12mm of fine ore bin is introduced into the first wet magnetic separation device and carries out a magnetic separation；
Concentrate product after (3) magnetic separation enters ball mill ore grinding；
Product from failing after (4) magnetic separation enters the straight line shaker that screen size is 1.5mm, the coarse fraction product conduct of+1.5mm
Building materials sale, the thin tailing of -1.5mm are discharged into tailings pump pond；
(5) magnetic iron ore after ball mill ore grinding feeds the second wet magnetic separation device and carries out secondary magnetic separation；
(6) the concentrate product after secondary magnetic separation, which is raised to send to grading plant, carries out grading；
(7) product from failing after secondary magnetic separation is discharged into tailings pump pond；
(8) coarse grain product after being classified is back to ball mill ore grinding again, after fine particle product (- 74 μm of grades account for 40% or more) enters
Continuous mill is elected to be industry.
In the present invention, the chromium depleted zone stone of mine extraction is machined to qualification by conventional Three stage crushing with single closed circuit stage sieving technology
Then granularity is transported to mill with belt conveyer and selects workshop fine ore bin, the magnetic iron ore exported from fine ore bin enters the first wet type magnetic
Screening device carries out first time magnetic separation, and a large amount of gangue mineral of monomer dissociation and poor adhesions present in fine ore are discharged by magnetic separation
Body, the concentrate after a magnetic separation feed ball mill again and carry out ore grinding.Due to adding for the first wet magnetic separation device, can make into
The grade of ore grinding stone is improved to some extent compared with original powder mine, while reducing a large amount of gangue mineral of monomer dissociation and poor companies
Raw body enters mill, and the processing capacity of ball mill can be made to be discharged by a relatively large margin；
Ore is after ore grinding, due to the reduction of granularity, the gangue mine of the newly-generated a certain amount of monomer dissociation of meeting in ore milling product
The monomer solution of this part new life is discharged so the product after ore grinding is sent into the second wet magnetic separation device in object and lean intergrowth
From gangue mineral and lean intergrowth, further mitigate grind grading circulation in circulating load, secondary magnetic concentrate, which is discharged to, to follow
Ring pumps pond, then raises to send to classifying equipoment with sand pump and carry out grading, and the coarse fraction product after classification then returns to ball mill and regrinds
Mine forms grind grading closed cycle；Fine fraction graded product after classification is qualified ore milling product, feeds subsequent mill and is elected to be
Industry.
Demagnetizer on the concentrate pipeline of second wet magnetic separation device can eliminate the magnetic mineral generated by magnetic separation
Magnetic coagulation phenomenon improves graded operation effect.
In addition, the product from failing after a magnetic separation is divided into thick tailing and thin tailing after sieving, it is possible to reduce tailings discharging amount,
While the thick tailing of output is also used as building material product and externally sells, and increases benefit income.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (6)
1. a kind of efficient magnetic iron ore milling method, equipment therefor includes the fine ore bin, ball mill and grading plant being sequentially connected,
It is characterized by comprising following steps:
(1) between fine ore bin and ball mill connect one for coarse granule sorting the first wet magnetic separation device, ball mill and point
A second wet magnetic separation device for fine grained sorting is connected between stage arrangement；
(2) magnetic iron ore that the granularity for being delivered to fine ore bin is -12mm is introduced into the first wet magnetic separation device and carries out a magnetic separation；
Concentrate product after (3) magnetic separation enters ball mill ore grinding；
(4) magnetic iron ore after ore grinding feeds the second wet magnetic separation device and carries out secondary magnetic separation；
(5) the concentrate product after secondary magnetic separation, which is raised to send to grading plant, carries out grading；
(6) coarse grain product after being classified is back to ball mill ore grinding again, after the fine particle product that -74 μm of grades account for 40% or more enters
Continuous mill is elected to be industry.
2. efficient magnetic iron ore milling method according to claim 1, it is characterised in that:
The straight line shaker that tailing after magnetic separation is 1.5mm by screen size, is divided into the thick tailing and size-of size+1.5mm
The thin tailing of 1.5mm, thin tailing are discharged into tailings pump pond, and thick tailing is sold as building products.
3. efficient magnetic iron ore milling method according to claim 1 or 2, it is characterised in that:
Demagnetizer is set on the concentrate pipeline of the second wet magnetic separation device, the concentrate product after secondary magnetic separation is first taken off
Magnetic treatment.
4. efficient magnetic iron ore milling method according to claim 1 or 2, it is characterised in that:
Product from failing after secondary magnetic separation is discharged into tailings pump pond.
5. efficient magnetic iron ore milling method according to claim 1 or 2, it is characterised in that:
The grading plant is cyclone or spiral classifier.
6. efficient magnetic iron ore milling method according to claim 1 or 2, it is characterised in that:
The first wet magnetic separation device and the second wet magnetic separation device are middle high field intensity bulky grain wet magnetic separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910771830.7A CN110523532A (en) | 2019-08-21 | 2019-08-21 | A kind of efficient magnetic iron ore milling method |
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| CN201910771830.7A CN110523532A (en) | 2019-08-21 | 2019-08-21 | A kind of efficient magnetic iron ore milling method |
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| US4341744A (en) * | 1979-01-22 | 1982-07-27 | Stauffer Chemical Company | Soda ash production |
| RU2011416C1 (en) * | 1992-04-28 | 1994-04-30 | Белгородский научно-исследовательский институт по обогащению и окомкованию руд черных металлов "Белмеханобрчермет" | Method for enrichment of compounded iron ores |
| CN101032708A (en) * | 2006-03-11 | 2007-09-12 | 山东金岭铁矿 | Magnetite wet type pre-selecting method |
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| RU2011416C1 (en) * | 1992-04-28 | 1994-04-30 | Белгородский научно-исследовательский институт по обогащению и окомкованию руд черных металлов "Белмеханобрчермет" | Method for enrichment of compounded iron ores |
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Application publication date: 20191203 |
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