CN103143438A - Production technique of magnetite refined powdered iron by dry process - Google Patents

Production technique of magnetite refined powdered iron by dry process Download PDF

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Publication number
CN103143438A
CN103143438A CN2013100691683A CN201310069168A CN103143438A CN 103143438 A CN103143438 A CN 103143438A CN 2013100691683 A CN2013100691683 A CN 2013100691683A CN 201310069168 A CN201310069168 A CN 201310069168A CN 103143438 A CN103143438 A CN 103143438A
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China
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magnetic
magnetic separator
separator
ore
mine tailing
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CN2013100691683A
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许建民
吕伟锋
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许建民
吕伟锋
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Priority to CN2013100691683A priority Critical patent/CN103143438A/en
Publication of CN103143438A publication Critical patent/CN103143438A/en
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Abstract

The invention discloses a production technique of magnetite refined powdered iron by a dry process, which comprises the following steps: crushing raw ores, and carrying out rough separation with a magnetic separator to concentrate the magnetite to the grade of higher than 25%; drying the ores with the humidity of higher than 5% to 2-3%, and grinding in a ball mill to obtain 60-200-mesh ore powder; sending the ore powder into a primary magnetic separator, wherein the primary magnetic separator is a drum-type magnetic separator provided with a dynamic magnetic system; and sending the refined powdered iron subjected to primary magnetic separation into a secondary magnetic separator, thereby obtaining the refined powdered iron, wherein the secondary magnetic separator is a drum-type magnetic separator with a dynamic magnetic system. The production technique disclosed by the invention has the advantages of simple technique, low investment cost, water resource saving, small occupied area, low production operation cost, and no discharge of wastewater or waste residue and no flying dust in the production process. The invention successfully solves the problem in separating low-grade magnetite in arid and high-cold regions, and provides a feasible way for solving the problem that low-grade magnetite resources can not be easily utilized.

Description

A kind of dry method magnetic iron ore powdered iron producing technique
Technical field
The invention belongs to the ore beneficiation technical field, be specifically related to a kind of dry method magnetic iron ore powdered iron producing technique.
Background technology
Magnetite separation generally adopts wet magnetic separation technique, and technique is simple, and technology maturation is widely used, but along with iron ore deposit reduces, grade descends.The rise in price of the energy, water resource, mine entironment protection and safety in production more and more receive publicity, and the deficiency of wet magnetic separation technique also highlights day by day.(1) the ore utilization rate is not high, generally below 75%.(2) water consumption is large, produces one ton of iron fine powder and approximately needs 3.5 tons of water.(3) the mine tailing ore discharge pollutes, and forms potential safety hazard.The production technology that some dry type magnetic separation magnetic iron ores also occurred in recent years, the patent No. 200410082956 is affected by ore dampness, produces unstablely, adopts the magnetic separation of low-intensity magnetic field multiple tracks, and mine tailing Armco magnetic iron content is high, causes waste.
Summary of the invention
The object of the invention is to solve the above-mentioned technical problem that exists in prior art, it is magnetic separator dry method magnetic iron ore powdered iron producing technique that a kind of dynamic magnetic is provided.
For achieving the above object, the technical solution used in the present invention is different:
Dry method magnetic iron ore powdered iron producing technique of the present invention, raw ore is roughly selected with magnetic separator after fragmentation, more than magnetic iron ore is enriched to 25% grade; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, iron fine powder after the one-level magnetic separation enters the secondary magnetic separation machine, and described secondary magnetic separation machine is with the cylinder magnetic separator of dynamic magnetic system, makes the iron fine powder.
Dry method magnetic iron ore powdered iron producing technique of the present invention, concrete steps are as follows:
Raw ore is roughly selected with magnetic separator, more than magnetic iron ore is enriched to 25% grade through being crushed to the 10mm left and right; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, and described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, cylinder surface magnetic induction intensity 90-250mT; Roller conveyor speed 2-9m/s; Concentrate after the one-level magnetic separation enters the secondary magnetic separation machine, and mine tailing enters the mine tailing magnetic separator and selects.
Described secondary magnetic separation machine is the cylinder magnetic separator with dynamic magnetic system, permanent magnetic pulley magnetic induction intensity 50-120 mT, and Roller conveyor speed 2-9m/s, the iron fine powder after secondary magnetic separation is transported to finished bin, and the chats of selecting returns to ball mill.
Described mine tailing magnetic separator is that magnetic separator permanent magnetic pulley magnetic induction intensity 150-300 mT selects mine tailing again with the cylinder magnetic separator of dynamic magnetic system, and mine tailing MFe content is less than 0.4%, and mine tailing is transported to tailing bin.Chats returns to ball mill.
Dry dressing method of the present invention is applicable to the easily magnetite ore of choosing, and humidity is less than the sand iron ore below 18%, the dry magnetic separation of the strongly magnetic minerals such as paigeite.
The cylinder magnetic separator that is with dynamic magnetic described in the present invention has adopted the magnetic separator of " drum-type magnetic separator magnetic system amplitude adjustment driving device " (patent No. 200820149220) with dynamic magnetic system, as the magnetic plant of magnetic iron ore magnetic separation iron fine powder.It is high that production technology has the ore utilization rate, saves water resource, reduces equipment investment, produces stable, operating cost is low, and floor space is little, non-environmental-pollution, and can be used for humidity at the sand iron ore below 18%, super poor iron ore, the dry production iron fine powder of the strongly magnetic minerals such as difficult ore dressing.
The present invention's dynamic magnetic used is that magnetic separator is that magnetic is the cylinder magnetic separator that waves with certain cycle, angle, magnetic system waves the drive magnetic mineral and moves at working surface, by mechanism, gangue particle from rolling into a ball, is removed magnetic iron ore magnetic, be conducive to improve the fine ore grade.
Patent of the present invention provides a technique simple, and investment cost is few, saving water resource, floor space is little, the operating cost of production is low, in production process without waste water, waste sludge discharge, without the dry method magnetite separation production technology of dust from flying.Successfully solved drought and water shortage, extremely frigid zones, the ore dressing problem of low-grade magnetite, the problem that is difficult to utilize for the low-grade magnetite resource have found a feasible approach.
Description of drawings
Fig. 1 is process chart of the present invention.
The specific embodiment
Embodiment 1
Raw ore is roughly selected with magnetic separator, more than magnetic iron ore is enriched to 25% grade through being crushed to the 10mm left and right; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, and described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, cylinder surface magnetic induction intensity 90-250mT; Roller conveyor speed 2-9m/s; Concentrate after the one-level magnetic separation enters the secondary magnetic separation machine, and mine tailing enters the mine tailing magnetic separator and selects;
Described secondary magnetic separation machine is the cylinder magnetic separator with dynamic magnetic system, permanent magnetic pulley magnetic induction intensity 50-120 mT, and Roller conveyor speed 2-9m/s, the iron fine powder after secondary magnetic separation is transported to finished bin, and the chats of selecting returns to ball mill;
Described mine tailing magnetic separator is that magnetic separator permanent magnetic pulley magnetic induction intensity 150-300 mT selects mine tailing again with the cylinder magnetic separator of dynamic magnetic system, and mine tailing MFe content is less than 0.4%, and mine tailing is transported to tailing bin, and the chats of selecting returns to ball mill.
Embodiment 2
Raw ore is roughly selected with magnetic separator, more than magnetic iron ore is enriched to 25% grade through being crushed to the 10mm left and right; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, and described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, cylinder surface magnetic induction intensity 90mT; Roller conveyor speed 2m/s; Concentrate after the one-level magnetic separation enters the secondary magnetic separation machine, and mine tailing enters the tail magnetic separator and selects;
Described secondary magnetic separation machine is the cylinder magnetic separator with dynamic magnetic system, permanent magnetic pulley magnetic induction intensity 50mT, and Roller conveyor speed 2m/s, the iron fine powder after secondary magnetic separation is transported to finished bin, and the chats of selecting returns to ball mill;
Described mine tailing magnetic separator is that magnetic separator permanent magnetic pulley magnetic induction intensity 150mT selects mine tailing again with the cylinder magnetic separator of dynamic magnetic system, and mine tailing MFe content is less than 0.4%, and mine tailing is transported to tailing bin, and the chats of selecting returns to ball mill.
Embodiment 3
Raw ore is roughly selected with magnetic separator, more than magnetic iron ore is enriched to 25% grade through being crushed to the 10mm left and right; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, and described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, cylinder surface magnetic induction intensity 250mT; Roller conveyor speed 9m/s; Concentrate after the one-level magnetic separation enters the secondary magnetic separation machine, and mine tailing enters the tail magnetic separator and selects;
Described secondary magnetic separation machine is the cylinder magnetic separator with dynamic magnetic system, permanent magnetic pulley magnetic induction intensity 120 mT, and Roller conveyor speed 9m/s, the iron fine powder after secondary magnetic separation is transported to finished bin, and the chats of selecting returns to ball mill;
Described mine tailing magnetic separator is that magnetic separator permanent magnetic pulley magnetic induction intensity 300 mT select mine tailing again with the cylinder magnetic separator of dynamic magnetic system, and mine tailing MFe content is less than 0.4%, and mine tailing is transported to tailing bin, and the chats of selecting returns to ball mill.
Embodiment 4
Raw ore is roughly selected with magnetic separator, more than magnetic iron ore is enriched to 25% grade through being crushed to the 10mm left and right; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, and described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, cylinder surface magnetic induction intensity 180mT; Roller conveyor speed 6m/s; Concentrate after the one-level magnetic separation enters the secondary magnetic separation machine, and mine tailing enters the tail magnetic separator and selects;
Described secondary magnetic separation machine is the cylinder magnetic separator with dynamic magnetic system, permanent magnetic pulley magnetic induction intensity 80 mT, and Roller conveyor speed 6m/s, the iron fine powder after secondary magnetic separation is transported to finished bin, and the chats of selecting returns to ball mill;
Described mine tailing magnetic separator is that magnetic separator permanent magnetic pulley magnetic induction intensity 220 mT select mine tailing again with the cylinder magnetic separator of dynamic magnetic system, and mine tailing MFe content is less than 0.4%, and mine tailing is transported to tailing bin, and the chats of selecting returns to ball mill.
Embodiment 5
Head grade 12%, broken through jaw, hammer is broken, the magnetic separator preliminary election obtains the MFe25% left and right, the rough concentrate of granularity 10 ~ 20mm, enter ball mill and make 100 order mineral fines, enter the magnetic separator feed bin through elevator, evenly feed the one-level magnetic extractor drum surface by oscillating feeder, magnetic induction intensity 120mT, rotating speed 2m/s ~ 9 m/s, rotating speed is adjustable, sub-elects concentrate 1, mine tailing 1.Concentrate 1 enters the secondary magnetic separation machine, and magnetic induction intensity 60mT, then choosing produce the above fine ore of grade 62%, discharge mine tailing 2.Tail, 1 adopts the mine tailing magnetic separator. and magnetic induction intensity 250mT magnet drum selects again, discharges mine tailing 3 Armco magnetic iron grades less than 0.25%, concentrate 3.Mine tailing 2. concentrate 3 return to ball mill for chats.
Embodiment 6
Sand iron ore after enrichment, Armco magnetic iron grade 20% left and right, humidity 12%, before entering ball mill, adopt the hot-air seasoning material, arrive humidity below 2%, make 80 order mineral fines, enter 1 grade of magnetic separator, magnetic extractor drum surface magnetic induction intensity 100mT, rotating speed 2m/s ~ 9m/s, adjustable, produce concentrate 1. mine tailing 1. concentrate 1 and enter magnetic induction intensity 60mT, 2 grades of magnetic separators select again, produce concentrate grade more than 63%.Discharge mine tailing 2, tail, 1 selects through the mine tailing magnetic separator again, discharges MFe less than 0.20% mine tailing 3 and concentrate 3, and mine tailing 2. concentrate 3 return to ball mill for chats.

Claims (2)

1. dry method magnetic iron ore powdered iron producing technique, it is characterized in that: raw ore is roughly selected with magnetic separator after fragmentation, more than magnetic iron ore is enriched to 25% grade; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, iron fine powder after the one-level magnetic separation enters the secondary magnetic separation machine, and described secondary magnetic separation machine is with the cylinder magnetic separator of dynamic magnetic system, makes the iron fine powder.
2. dry method magnetic iron ore powdered iron producing technique according to claim 1 is characterized in that concrete steps are as follows:
Raw ore is roughly selected with magnetic separator, more than magnetic iron ore is enriched to 25% grade through being crushed to the 10mm left and right; Humidity should be dried ore greater than 5% ore that humidity 2-3% is laggard to be entered ball mill and carry out grinding, obtains 60-200 order mineral fine; The breeze of making enters the one-level magnetic separator, and described one-level magnetic separator is the cylinder magnetic separator with dynamic magnetic system, cylinder surface magnetic induction intensity 90-250mT; Roller conveyor speed 2-9m/s; Concentrate after the one-level magnetic separation enters the secondary magnetic separation machine, and mine tailing enters the mine tailing magnetic separator and selects;
Described secondary magnetic separation machine is the cylinder magnetic separator with dynamic magnetic system, permanent magnetic pulley magnetic induction intensity 50-120 mT, and Roller conveyor speed 2-9m/s, the iron fine powder after secondary magnetic separation is transported to finished bin, and the chats of selecting returns to ball mill;
Described mine tailing magnetic separator is that magnetic separator permanent magnetic pulley magnetic induction intensity 150-300 mT selects mine tailing again with the cylinder magnetic separator of dynamic magnetic system, and mine tailing MFe content is less than 0.4%, and mine tailing is transported to tailing bin, and the chats of selecting returns to ball mill.
CN2013100691683A 2013-03-05 2013-03-05 Production technique of magnetite refined powdered iron by dry process Pending CN103143438A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495735A (en) * 2013-09-06 2014-01-08 安徽华钢冶金科技有限公司 Powder metallurgy method
CN104399584A (en) * 2014-12-13 2015-03-11 唐山市丰润区华晨机械维修部 Dry magnetic separation technology for waste steel slags
CN106944258A (en) * 2017-04-27 2017-07-14 酒泉钢铁(集团)有限责任公司 The dry type ore sorting technique of iron ore concentrate is extracted from extreme poverty sand iron ore
CN106179706B (en) * 2016-08-04 2019-08-23 山东济钢合金材料科技有限公司 A method of separating the iron oxide mixed from iron powder

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132560A (en) * 1981-02-10 1982-08-16 Sumitomo Heavy Ind Ltd Dressing method of pyrite cinder
CN1053758A (en) * 1991-02-07 1991-08-14 四川省地质矿产局化探队 Bastnaesite magnet-gravity technology
JPH10230185A (en) * 1997-02-20 1998-09-02 Toyota Motor Corp Apparatus and method for treating shredder dust
CN1623669A (en) * 2004-12-14 2005-06-08 李兴斌 Dry mineral separation technology process for producing iron refine ore from iron ore containing magnetic
CN1623668A (en) * 2004-12-14 2005-06-08 李兴斌 Combined mineral separation technology process for producing iron refine ore powder containing magnetic iron ore
CN101007294A (en) * 2007-01-26 2007-08-01 郭心岭 Magnetic separation concentration method
CN101422752A (en) * 2007-11-01 2009-05-06 鞍钢集团矿业公司 Method for reducing the level of reselection tailings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57132560A (en) * 1981-02-10 1982-08-16 Sumitomo Heavy Ind Ltd Dressing method of pyrite cinder
CN1053758A (en) * 1991-02-07 1991-08-14 四川省地质矿产局化探队 Bastnaesite magnet-gravity technology
JPH10230185A (en) * 1997-02-20 1998-09-02 Toyota Motor Corp Apparatus and method for treating shredder dust
CN1623669A (en) * 2004-12-14 2005-06-08 李兴斌 Dry mineral separation technology process for producing iron refine ore from iron ore containing magnetic
CN1623668A (en) * 2004-12-14 2005-06-08 李兴斌 Combined mineral separation technology process for producing iron refine ore powder containing magnetic iron ore
CN101007294A (en) * 2007-01-26 2007-08-01 郭心岭 Magnetic separation concentration method
CN101422752A (en) * 2007-11-01 2009-05-06 鞍钢集团矿业公司 Method for reducing the level of reselection tailings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103495735A (en) * 2013-09-06 2014-01-08 安徽华钢冶金科技有限公司 Powder metallurgy method
CN104399584A (en) * 2014-12-13 2015-03-11 唐山市丰润区华晨机械维修部 Dry magnetic separation technology for waste steel slags
CN106179706B (en) * 2016-08-04 2019-08-23 山东济钢合金材料科技有限公司 A method of separating the iron oxide mixed from iron powder
CN106944258A (en) * 2017-04-27 2017-07-14 酒泉钢铁(集团)有限责任公司 The dry type ore sorting technique of iron ore concentrate is extracted from extreme poverty sand iron ore

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