CN102553709A - Magnetite roller mill dry separation method - Google Patents
Magnetite roller mill dry separation method Download PDFInfo
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- CN102553709A CN102553709A CN2012100127056A CN201210012705A CN102553709A CN 102553709 A CN102553709 A CN 102553709A CN 2012100127056 A CN2012100127056 A CN 2012100127056A CN 201210012705 A CN201210012705 A CN 201210012705A CN 102553709 A CN102553709 A CN 102553709A
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Abstract
The invention relates to a magnetite roller mill dry separation method which comprises the following steps that: firstly, the broken original ore is roughly separated by a dry separator; secondly, ore charge with the particle size of 25 to 80mm is sent to a high-pressure roller mill, the discharged material passes through a sieve with the sieve pore of 3 to 8mm, the ore with the particle size of more than 3 to 8mm returns to a pre-grinding dry separatorr; thirdly, the ore charge with small particle size is subjected to first-section dry separation, and the first-section dry separator has the magnetic field strength of 3500 to 5000GS and a rotary speed of 60 to150r/min; fourthly, the ore charge subjected to the first-section dry separation is subjected to second-section dry separation, and a second-section dry separator has the magnetic field strength of 1500 to 3500GS and a rotary speed of 60 to 200r/min; and fifthly, the ore charge subjected to the second-section dry separation is subjected to third-section dry separation to obtain dry fine powder, a third-section dry separator has the magnetic field strength of 800 to 2800GS and a rotary speed of 80 to 500r/min, and tailings from the third-section dry separation returns to the pre-grinding dry separator.
Description
Technical field
The invention belongs to magnetic iron ore dry separation technical field, be specifically related to a kind of magnetic iron ore roller mill dry dressing method.
Background technology
At present, the step of traditional magnet ore deposit ore-dressing technique is: referring to Fig. 1, with raw ore carry out successively slightly broken, in broken and thin broken; Magnetic iron ore after thin the breaking is behind dry type magnetic separation, and a part is discharged as mine tailing; Remaining gets into the wet milk wet-milling; After passing through wet magnetic separation again through the magnetic iron ore after the wet-milling, a part reclaims as the smart powder of iron, remainingly discharges as mine tailing.The shortcoming of this technology is: magnetic iron ore only through meticulous broken, dry type magnetic separation, discharge and also have some magnetic iron ores to be used as mine tailing by wet-milling, twice ore dressing of wet magnetic separation, and row is done in the bad realization of wet separation mine tailing, and environmental pollution is serious, does not meet national policy.
Therefore, along with the utilization of continually developing of China's iron ore deposit, iron ore deposit is poor day by day, rich ore and fewer and feweri than the iron ore of high-grade, and in the sorting of iron ore of low ore grade, it is low to exist the mine tailing rate of recovery again, the not high problem of the smart fine ore grade of iron.
More and more scholars and expert also begin to pay close attention to the rate of recovery that how to improve mine tailing, develop the problem of existing poor iron ore deposit as much as possible.
How low-cost large scale mining and the rate of recovery that improves mine tailing are our problem demanding prompt solutions at present.
Summary of the invention
In order to overcome the deficiency of above-mentioned prior art; The object of the present invention is to provide a kind of magnetic iron ore roller mill dry dressing method; Have that the mine tailing rate of recovery is high, mine tailing Armco magnetic iron content is controlled≤0.5%, and the high characteristics of smart grade powder, can realize a large amount of tailing dry rows; Prolong mine tailing storehouse service life, reduced environmental pollution.
To achieve these goals, the technical scheme that the present invention adopts is: a kind of magnetic iron ore roller mill dry dressing method may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, after process was roughly selected with the last step, granularity is that the ore of 25～80mm is sent into the high-pressure roller mill extruding, and the sieve that sieve aperture is 3～8mm is crossed in discharging, returns the preceding dry-dressing machine of mill greater than 3～8mm ore, and the small particle diameter mineral aggregate gets into next process;
Once more, the small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing; The magnetic field intensity of first section dry-dressing machine is 3500～4000GS, and the rotating speed of first section dry-dressing machine is 60～150r/min, after tail is thrown in dry separation through this section fine ore; Concentrate grade is further enhanced, and dividing concentrate selection TFe grade is 8～20%, and productive rate is 30～60%; The rate of recovery is 60～90%, and mine tailing TFe grade is 4～10%, and mine tailing Armco magnetic iron content is 0.3～1%;
The 4th; Mineral aggregate through first section dry separation gets into second section dry separation; And the discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 2000～3000GS, the revolution of second section dry-dressing machine is 60～130r/min; After tail is thrown in dry separation through this section fine ore; Concentrate grade is further enhanced, and dividing concentrate selection TFe grade is 15～28%, and productive rate is 50～75%; The rate of recovery is 55～85%, and mine tailing TFe grade is 4～12%;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder; The magnetic field intensity of the 3rd section dry-dressing machine is 800～1800GS, and the rotating speed of the 3rd section dry-dressing machine is 80～500r/min, and dry-dressing machine was roughly selected before mine tailing returned mill; Get into high-pressure roller mill circulation extruding once more, tailing has alleviated the high-pressure roller mill roll surface wear, thereby prolongs roll surface service life; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and divided concentrate selection TFe grade 25～55%; Productive rate is 30～70%, and the rate of recovery is 50～80%, and mine tailing TFe grade is 6～15%.
The invention has the beneficial effects as follows:
The present invention utilizes high-pressure roller mill as the in small, broken bits of iron ore comminution process and corase grind, can increase substantially the production capacity of whole system, reduces the energy consumption and the steel consumption of system simultaneously, has energy-efficient advantage.Compared with prior art, effect of the present invention has:
1) improves the smart grade powder of iron, improved the mine tailing rate of recovery.
2) reduce the content of fine powder in the mine tailing, fine powder and coarse grain mine tailing are mixed, can get into the barren rock stockyard, improved the easy fluidity of mine tailing, reduced the mine tailing intractability, prolonged the mine tailing storehouse life-span.
3) rational gradation composition high-pressure roller mill material size has reduced the loss of equipment, has reduced vibration, and has prolonged the service life of equipment.
4) regrind before the mine tailing behind three stages of magnetic separation returns mill; Effectively improve peeling off between the ore crystal, especially this technology in any mineral processing circuit in the past once design adopted, this technology invention can be controlled the height of concentrate grade; Also can control ferromagnetic throwing tail content in the mine tailing; The mine tailing closed cycle effectively raises the mine tailing utilization rate, controls ferromagnetic throwing tail amount.
5) equipment is simple, and flow process is simple, significantly reduces investment outlay and maintenance cost.
6) improve system throughput, reduced system energy consumption.
Description of drawings
Fig. 1 is the magnetite separation process chart of prior art.
Fig. 2 is a process chart of the present invention.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done further explain.
Embodiment one
With reference to accompanying drawing 2, it is 9.79% that this instance adopts raw ore TFe grade.A kind of magnetic iron ore roller mill dry dressing method may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, with the last step through after roughly selecting, granularity is that the ore of 60～70mm is sent into the high-pressure roller mill extruding, the sieve that sieve aperture is 8mm is crossed in discharging, selects machine before returning dry grinding greater than the 8mm ore, the small particle diameter mineral aggregate gets into next process;
Once more; The small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 4000GS; The rotating speed of first section dry-dressing machine is 80r/min; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and dividing concentrate selection TFe grade is 14.35%; Productive rate is 33.09%; The rate of recovery is 70.71%, and mine tailing TFe grade is 5.54%, and mine tailing Armco magnetic iron content is 0.42%;
The 4th; Mineral aggregate through first section dry separation gets into second section dry separation; And the discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 3000GS, the rotating speed of second section dry-dressing machine is 110r/min; After tail is thrown in dry separation through this section fine ore; Concentrate grade is further enhanced, and dividing concentrate selection TFe grade is 17.87%, and productive rate is 68.23%; The rate of recovery is 84.97%, and mine tailing TFe grade is 6.79%;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder; The magnetic field intensity of the 3rd section dry-dressing machine is 1800GS, and the rotating speed of the 3rd section dry-dressing machine is 150r/min, and dry-dressing machine was roughly selected before mine tailing returned mill; Get into high-pressure roller mill circulation extruding once more, tailing has alleviated the high-pressure roller mill roll surface wear, thereby prolongs roll surface service life; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and divided concentrate selection TFe grade 26.01%; Productive rate is 51.66%, and the rate of recovery is 75.27%, and mine tailing TFe grade is 9.14%.
Embodiment two
It is 10.64% that this instance adopts raw ore TFe grade.A kind of magnetic iron ore roller mill dry dressing method may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, after process was roughly selected with the last step, granularity is that the ore of 50～60mm is sent into the high-pressure roller mill extruding, and the sieve that sieve aperture is 5mm is crossed in discharging, returns the preceding dry-dressing machine of mill greater than the 5mm ore, and the small particle diameter mineral aggregate gets into next process;
Once more; The small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 3800GS; The rotating speed of first section dry-dressing machine is 100r/min; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and dividing concentrate selection TFe grade is 14.39%; Productive rate is 55.57%; The rate of recovery is 75.15%, and mine tailing TFe grade is 5.95%, and mine tailing Armco magnetic iron content is 0.42%;
The 4th; Mineral aggregate through first section dry separation gets into second section dry separation; And the discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 2500GS, the rotating speed of second section dry-dressing machine is 150r/min; After tail is thrown in dry separation through this section fine ore; Concentrate grade is further enhanced, and dividing concentrate selection TFe grade is 17.53%, and productive rate is 66.35%; The rate of recovery is 80.82%, and mine tailing TFe grade is 8.20%;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder; The magnetic field intensity of the 3rd section dry-dressing machine is 1300GS, and the rotating speed of the 3rd section dry-dressing machine is 350r/min, and dry-dressing machine was roughly selected before mine tailing returned mill; Get into high-pressure roller mill circulation extruding once more, tailing has alleviated the high-pressure roller mill roll surface wear, thereby prolongs roll surface service life; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and divided concentrate selection TFe grade 28.02%; Productive rate is 45.84%, and the rate of recovery is 73.28%, and mine tailing TFe grade is 8.65%.
Embodiment three
It is 10.89% that this instance adopts raw ore TFe grade.
A kind of magnetic iron ore roller mill dry dressing method may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, after process was roughly selected with the last step, granularity is that the ore of 25～50mm is sent into the high-pressure roller mill extruding, and the sieve that sieve aperture is 3mm is crossed in discharging, returns dry-dressing machine greater than the 3mm ore, and the small particle diameter mineral aggregate gets into next process;
Once more; The small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 3500GS; The rotating speed of first section dry-dressing machine is 110r/min; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and dividing concentrate selection TFe grade is 19.38%; Productive rate is 56.00%; The rate of recovery is 82.10%, and mine tailing TFe grade is 8.24%, and mine tailing Armco magnetic iron content is 0.89%;
The 4th; Mineral aggregate through first section dry separation gets into second section dry separation; And the discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 2000GS, the rotating speed of second section dry-dressing machine is 180r/min; After tail is thrown in dry separation through this section fine ore; Concentrate grade is further enhanced, and dividing concentrate selection TFe grade is 26.09%, and productive rate is 73.02%; The rate of recovery is 84.12%, and mine tailing TFe grade is 11.10%;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder; The magnetic field intensity of the 3rd section dry-dressing machine is 800GS, and the rotating speed of the 3rd section dry-dressing machine is 500r/min, and dry-dressing machine was roughly selected before mine tailing returned mill; Get into high-pressure roller mill circulation extruding once more, tailing has alleviated the high-pressure roller mill roll surface wear, thereby prolongs roll surface service life; After tail was thrown in dry separation through this section fine ore, concentrate grade was further enhanced, and divided concentrate selection TFe grade 53.82%; Productive rate is 68.29%, and the rate of recovery is 77.25%, and mine tailing TFe grade is 14.01%.
Claims (4)
1. a magnetic iron ore roller mill dry dressing method is characterized in that, may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, after process was roughly selected with the last step, granularity is that the ore of 25～80mm is sent into the high-pressure roller mill extruding, and the sieve that sieve aperture is 3～8mm is crossed in discharging, returns the preceding dry-dressing machine of mill greater than 3～8mm ore, and the small particle diameter mineral aggregate gets into next process;
Once more, the small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 3500～5000GS, and the rotating speed of first section dry-dressing machine is 60～150r/min;
The 4th, through second section dry separation of mineral aggregate entering of first section dry separation, and discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 1500～3500GS, the rotating speed of second section dry-dressing machine is 60～200r/min;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder, the magnetic field intensity of the 3rd section dry-dressing machine is 800～2800GS, and the rotating speed of the 3rd section dry-dressing machine is 80～500r/min, and mine tailing returns dry-dressing machine before the mill.
2. a kind of magnetic iron ore roller mill dry dressing method according to claim 1 is characterized in that, may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, with the last step through after roughly selecting, granularity is that the ore of 30～70mm is sent into the high-pressure roller mill extruding, the sieve of sieve aperture for≤8mm crossed in discharging, returns dry-dressing machine before the mill greater than the 8mm ore, the small particle diameter mineral aggregate gets into next process;
Once more, the small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 4000GS, and the rotating speed of first section dry-dressing machine is 80r/min;
The 4th, through second section dry separation of mineral aggregate entering of first section dry separation, and discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 3000GS, the rotating speed of second section dry-dressing machine is 90r/min;
Five, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder, the magnetic field intensity of the 3rd section dry-dressing machine is 1500GS, and the rotating speed of the 3rd section dry-dressing machine is 350r/min, and mine tailing returns dry-dressing machine before the mill.
3. a kind of magnetic iron ore roller mill dry dressing method according to claim 1 is characterized in that, may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, with the last step through after roughly selecting, granularity is that the ore of 40～60mm is sent into the high-pressure roller mill extruding, the sieve of sieve aperture for≤5mm crossed in discharging, returns dry-dressing machine before the mill greater than the 5mm ore, the small particle diameter mineral aggregate gets into next process;
Once more, the small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 3800GS, and the rotating speed of first section dry-dressing machine is 80r/min;
The 4th, through second section dry separation of mineral aggregate entering of first section dry separation, and discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 2500GS, the rotating speed of second section dry-dressing machine is 110r/min;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder, the magnetic field intensity of the 3rd section dry-dressing machine is 1000GS, and the rotating speed of the 3rd section dry-dressing machine is 450r/min, and mine tailing returns dry-dressing machine before the mill.
4. a kind of magnetic iron ore roller mill dry dressing method according to claim 1 is characterized in that, may further comprise the steps:
At first, with crushing raw ore, broken raw ore is discharged mine tailing after roughly selecting through dry-dressing machine;
Secondly, after process was roughly selected with the last step, granularity is that the ore of 25～50mm is sent into the high-pressure roller mill extruding, and the sieve that sieve aperture is 3mm is crossed in discharging, returns the preceding dry-dressing machine of mill greater than the 3mm ore, and the small particle diameter mineral aggregate gets into next process;
Once more, the small particle diameter mineral aggregate of last step screening gets into first section dry separation, and discharges mine tailing, and the magnetic field intensity of first section dry-dressing machine is 3500GS, and the rotating speed of first section dry-dressing machine is 90r/min;
The 4th, through second section dry separation of mineral aggregate entering of first section dry separation, and discharge mine tailing, the magnetic field intensity of second section dry-dressing machine is 2000GS, the rotating speed of second section dry-dressing machine is 130r/min;
The 5th, get into the 3rd section dry separation through the mineral aggregate of second section dry separation, obtain doing smart powder, the magnetic field intensity of the 3rd section dry-dressing machine is 800GS, and the rotating speed of the 3rd section dry-dressing machine is 500r/min, and mine tailing returns dry-dressing machine before the mill.
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| CN2012100127056A CN102553709A (en) | 2012-01-16 | 2012-01-16 | Magnetite roller mill dry separation method |
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| CN2012100127056A CN102553709A (en) | 2012-01-16 | 2012-01-16 | Magnetite roller mill dry separation method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107759A (en) * | 2014-07-29 | 2014-10-22 | 山东华联矿业股份有限公司 | Flotation tailing iron recycling device and method |
| CN105880003A (en) * | 2016-05-27 | 2016-08-24 | 马鞍山市天工科技股份有限公司 | Non-sieving high-pressure roller grinding dry-type magnetic separation method for magnetic ores |
| CN114618635A (en) * | 2022-03-28 | 2022-06-14 | 胡沿东 | Dry grinding and dry separation process of magnetic iron ore |
-
2012
- 2012-01-16 CN CN2012100127056A patent/CN102553709A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 覃大国: "浅谈磁选厂降低能耗的途径", 《河北冶金》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104107759A (en) * | 2014-07-29 | 2014-10-22 | 山东华联矿业股份有限公司 | Flotation tailing iron recycling device and method |
| CN105880003A (en) * | 2016-05-27 | 2016-08-24 | 马鞍山市天工科技股份有限公司 | Non-sieving high-pressure roller grinding dry-type magnetic separation method for magnetic ores |
| CN105880003B (en) * | 2016-05-27 | 2018-06-05 | 马鞍山市天工科技股份有限公司 | A kind of magnetic iron ore is without screening high pressure roller mill dry type magnetic separation method |
| CN114618635A (en) * | 2022-03-28 | 2022-06-14 | 胡沿东 | Dry grinding and dry separation process of magnetic iron ore |
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Application publication date: 20120711 |