CN104128259A - Simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore - Google Patents
Simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore Download PDFInfo
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Abstract
The invention relates to a simple magnetic separation process for Anshan type iron carbonate-containing lean magnetite ore. The process includes ore grinding, grading and magnetic separation and comprises the following concrete steps: ore grinding three times; presorting with a large-wrap angle medium-intensity magnet separator; grading with a cyclone three times; dehydration in three stages; fine sieving in two stages; and magnetic separation with a magnet separator in four stages. The invention provides the energy-saving, low-carbon, environment-friendly and reliable production process for treatment of iron carbonate-containing lean magnetite ore by using a simple magnetic separation method; the process can further improve treating capability, enhance technical and economic indexes, reduce production cost and greatly increase the utilization efficiency of inferior resources while improving ore grinding, grading and sorting efficiency.
Description
Technical field
The invention belongs to technique of preparing field, relate in particular to a kind of Anshan type containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate.
Background technology
Anshan type lean octahedral iron ore belongs to metamorphosed sedimentary ore deposit, is the iron ore that a kind of particulate is contaminated.The natural type of ore is mainly ferruginous quartizite, is made up of quartz (or hornblend) and magnetic iron ore (containing part martite), is mainly configured to ribbon and disseminated.Anshan type lean octahedral iron ore stone belongs to the poor iron ore of high silicon, low-sulfur phosphorus, red, content of limonite is less, and its disseminated grain size is thin and inhomogeneous.
According to the character of Anshan type lean octahedral iron ore stone, domestic and international most of ore dressing plants have generally all adopted stage grinding one magnetic separation-dusting cover regrinding process flow process complete the ore grinding of ore and sort at present, and reasonable sorting index has all been obtained in ore dressing plant mostly.
Anshan type belongs to a kind of specific type in Anshan type lean octahedral iron ore containing the poor magnetic iron ore of ferric carbonate, although still belong to the iron ore that metamorphosed sedimentary ore deposit and particulate are contaminated, its ore natural type be mainly magnetite quartzite, magnet vacation as Chi Tieshiyingyan, the vacation of magnet sparring as compositions such as Chi Tieshiyingyan and sparring quartzites.Such ore is different from general Anshan type lean octahedral iron ore stone, its ore composition is more complicated, mineral crystal form is poor, the maximum feature of ore is that Armco magnetic iron content is lower than general poor magnetic iron ore, ferric carbonate content is relatively high, also, with a small amount of illusion, half illusion and hematite-limonite thing, iron grade is than low 5～10% left and right of the poor magnetite of general Anshan type; Anshan type is thinner compared with general Anshan type lean octahedral iron ore containing the disseminated grain size of the poor magnetic iron ore iron mineral of ferric carbonate and gangue mineral, because its disseminated grain size is thinner by 15～20% than general Anshan type lean octahedral iron ore stone, therefore liberation degree of minerals is lower, the not only difficult mill of such ore but also difficult choosing, technique of preparing economic indicator is poor, and the past is generally discarded in Pai Yanchang as rock in mining process.For the processing method of the magnetic iron ore of high carbon acid iron content be at present: 1, at blowing air not or pass into while being heated to 300～400C ° under the condition of a small amount of air and become magnetic iron ore by neutral Roasting Decomposition, then continue process for producing iron ore concentrate by beneficiation methods such as magnetic separation, current domestic Jin You only a few enterprise adopts in this way, and the critical defect that this method exists is that production cost is high, energy consumption is high, the pernicious gas that particularly roasting process produces easily pollutes air quality, 2, processing at present containing the up-to-date treatment technology of the refractory ores such as ferric carbonate is employing drastic reduction-efficient separation technology, the ore that is about to be crushed to certain particle size is under the condition lower than its melt temperature, be reduced into metallic iron with reducing agent (as coal dust), the metallic iron atom restoring under specified temp can natural shrinking, constantly annex and grow up, finally grow up to the iron particle of certain particle size, grog after reduction is cooling through shrend, iron particle and gangue two-phase interface are shunk, be conducive to dissociating of iron granule and gangue in follow-up ore grinding, after sorting, can obtain high-grade, high-recovery, the product of high degree of metalization, this product can replace steel scrap to enter steelmaking process after briquetting, current this technology is just in the experimental study stage, not examples of industrial application, although this technique can be improved the concentration effect of metallic iron, but this technique exists energy consumption high and environment is had to problems such as impact equally.
Anshan Iron and Steel Group of mining company have approximately 1.2 hundred million tons of proved reserves containing the poor magnetic iron ore of ferric carbonate, because ferric carbonate content in ore is on average more than 9%, discard and do not exploited utilization always in decades, constantly riseing along with imported iron ore stone and iron ore concentrate price in recent years, also created favourable external environment condition to the development and utilization of this ore resource, the boring sample that Anshan iron and steel plant mining industry design and research institute in 2007 explores during according to the geologic prospect of geologic prospect institute of Liaoning Province, be mixed with the sample ore that substantially represents mining area, The Solitary Hill ore properties in conjunction with geologic report, carry out the experimental study of ore washability, at head grade 27.92%, ferric carbonate content 9.85%, adopt " three sections of ore grindings, discarding coarse tailing, magnetic concentrate regrinding selects again " technological process sorts, laboratory test obtains concentrate grade 65.35%, tailings grade 17.55%, the result of the test of concentrate yield 21.70%, The Great Hermit Hill pelletizing plant of Anshan iron and steel plant group adopted the general Anshan type lean octahedral iron ore stone of original processing " stage grinding-single magnetic separation-dusting cover regrinding process " to process Anshan type containing the poor magnetic iron ore of ferric carbonate accordingly since 2010, obtain the production target close with lab index.
At present; sort Anshan type containing the poor magnetic iron ore of ferric carbonate below 6%; the general " stage grinding-single magnetic separation-dusting cover regrinding process that adopts " but along with the continuous checking of production practices, this treatment process also exposes many obvious defects: the one, because such ore disseminated grain size is thin, magnetic mineral content is relatively low, therefore original Grinding procedure product granularity often cannot meet the needs of realizing monomer dissociation, cause that concentrate grade is on the low side and fluctuation is large, be difficult to reach more than 65% index of laboratory concentrate grade; The 2nd, original first and second classifier for milling ore efficiency is low, has overground phenomenon, and under ore milling product Minerals degree of dissociation condition on the low side ,-10 microns of content but obviously increase, and easily cause and sort ferromagnetic loss in process metal loss, particularly mine tailing; The 3rd, an original sorting equipment is the common low-intensity (magnetic) separator below magnetic field intensity 200mT, and its mine tailing productive rate accounts for the more than 80% of total mine tailing productive rate, to inadaptable containing the poor magnetic iron ore of ferric carbonate, equally easily causes metal loss; The 4th, tertiary grinding grading technology and flow process regulating power are poor, and ore milling product granularity is partially thick, and the problems referred to above finally cause that concentrate grade is low, tailings grade is high, and the level of resources utilization is low, and production cost is high.
summary of the invention
The object of the invention is character and feature containing the poor magnetic iron ore of ferric carbonate according to Anshan type, for upper
State defect and deficiency that original technique and technology exist, provide a kind of economy, Anshan type efficient, environmental protection to contain the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, in improving ore grinding, classification and sorting efficiency, improve sorting index, reduce production costs, improve the level of resources utilization inferior, realize energy-conservation and target low-carbon environment-friendly.
The object of the invention is to realize by following technical proposals:
Containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, comprise ore grinding-classification-magnetic separation according to a kind of Anshan type of the present invention, comprise the following steps:
1) granularity-12mm is accounted for more than 93%, more than 7% the feeding a long cylinder overflowball mill I containing the poor magnetic iron ore of ferric carbonate and carry out grinding operation one time of iron grade in full iron grade 17～28%, ferric carbonate, the ore discharge product of ball mill feeds preliminary election machine in magnetic field in large cornerite, concentrate after preliminary election feeds Primary dynamic pressure and carries out scalping operation to ore deposit cyclone, its Primary dynamic pressure returns to grinding machine No. one time to the sand setting of ore deposit cyclone, and to granularity-200 order of ore deposit cyclone, more than 60% overflow product feeds magnetic field magnetic separator in a section to Primary dynamic pressure;
2) the concentrate product that magnetic field magnetic separator sorts rear grade 44～48% in a section feeds secondary dynamic pressure and carries out secondary grading to ore deposit cyclone, secondary dynamic pressure is returned to magnetic field magnetic separator in a section to the sand setting of ore deposit cyclone after long cylinder overflowball mill II is carried out secondary grinding, and to cyclone granularity-200, ore deposit order, more than 90% overflow product feeds one section of drench pit and two sections of weak magnetic separators in secondary dynamic pressure;
3) the concentrate product that one section of drench pit and two sections of weak magnetic separators sort rear grade 56～59% feeds one section of electric and magnetic oscillation vibrating dusting cover, the oversize of one section electric and magnetic oscillation vibrating dusting cover feeds three dynamic pressures to ore deposit cyclone, the sand setting of No. three cyclones feeds vertical stirring mill III to carry out returning to cyclone No. three times after tertiary grinding, and the more than 90% overflow product of granularity-325 order of No. three cyclones feeds two sections of drench pits and three sections of weak magnetic separators;
4) the concentrate product that two sections of drench pits and three sections of weak magnetic separators sort rear grade 55～58% feeds two sections of electric and magnetic oscillation vibrating dusting covers, and the oversize of two sections of electric and magnetic oscillation vibrating dusting covers returns to three dynamic pressures to ore deposit cyclone;
5) undersize of one section of electric and magnetic oscillation vibrating dusting cover grade 63～65% and two sections of electric and magnetic oscillation vibrating dusting cover grade 62～64% undersizes merging feed three sections of drench pits and four sections of weak magnetic separators, and the concentrate that sorts rear grade 65～66% becomes final concentrate;
6) in the mine tailing of magnetic field preliminary election machine in large cornerite, one section, the mine tailing of mine tailing, two sections of drench pits and three sections of weak magnetic separators of magnetic field magnetic separator and the mine tailing of three sections of drench pits and four sections of weak magnetic separators merge and become true tailings.
Above-mentioned Anshan type contains the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, preliminary election machine in magnetic field in described large cornerite, and adopting High-gradient Magnetic is magnetic pole, drum surface average field-strength is 250mT, Guide canel is 240 °, roughly selects and scans district's magnetic pole and adopt wide magnetic pole, and selected district magnetic pole adopts multipole narrow magnetic pole.
In described one section, magnetic field magnetic separator drum surface average field-strength is 200mT, wherein scans district field intensity average out to 250mT, and Guide canel is 135 °.
Described low-intensity (magnetic) separator is that multipole magnetic is high gradient magnetic separator, and magnetic pole is 8～10, and disk pack angle is 140 °～150 °, and drum surface average field-strength is 180～200mT.
Described low-intensity (magnetic) separator is that multipole magnetic is high gradient magnetic separator, and magnetic pole is 8～10, and disk pack angle is 140 °～150 °, and drum surface average field-strength is 180～200mT.
Described drench pit is that bottom magnetic is permanent magnet dehydration tank.
Described electric and magnetic oscillation vibrating dusting cover screen size is for being less than or equal to 76 microns, and percent opening is more than 30%.
Advantage of the present invention is:
1) after an ore grinding, directly carry out preliminary election operation owing to having adopted completing, then carry out graded operation, a large amount of qualified tailings of can dishing out in advance, in reducing by ore grinding circulating load, a raising scalping efficiency and improving ore grinding raw meal particle size composition, can increase substantially grinding machine disposal ability;
2) the present invention's first and second ore grinding adopts long cylinder overflow type grinding machine, and tertiary grinding adopts vertical stirring mill, has improved grinding efficiency, has ensured ore milling product granularity;
3) the present invention is directed to Anshan type containing the poor magnetic iron ore characteristic of ferric carbonate, magnetic field magnetic separator during preliminary election and a stages of magnetic separation adopt, other each section sorts the combination that adopts weak magnetic separator and magnetic dewater cone, has both reduced ferromagnetic loss in mine tailing, has improved again final concentrate grade;
4) the present invention adopts the organic assembling of electric and magnetic oscillation vibrating dusting cover and cyclone, has improved tertiary grinding and grading effect, has ensured end product quality.
The present invention is for adopting single magnetic selection method to process the reliable production technology that a kind of energy-conservation and low-carbon environment-friendly is provided containing the poor magnetic iron ore of ferric carbonate, in improving ore grinding, classification and sorting efficiency, can further improve disposal ability, improve technical and economic requirements, reduce production costs, increase substantially the level of resources utilization inferior.
Brief description of the drawings
Fig. 1 is process chart of the present invention.
Detailed description of the invention
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment.
As shown in Figure 1, containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, comprise ore grinding-classification-magnetic separation according to a kind of Anshan type of the present invention, comprise the following steps:
1) granularity-12mm is accounted for more than 93%, more than 7% the feeding a long cylinder overflowball mill I containing the poor magnetic iron ore of ferric carbonate and carry out grinding operation one time of iron grade in full iron grade 17～28%, ferric carbonate, the ore discharge product of ball mill feeds preliminary election machine in magnetic field in large cornerite, concentrate after preliminary election feeds Primary dynamic pressure and carries out scalping operation to ore deposit cyclone, its Primary dynamic pressure returns to grinding machine No. one time to the sand setting of ore deposit cyclone, and to granularity-200 order of ore deposit cyclone, more than 60% overflow product feeds magnetic field magnetic separator in a section to Primary dynamic pressure;
Preliminary election machine in magnetic field in described large cornerite, adopting High-gradient Magnetic is magnetic pole, and drum surface average field-strength is 250mT, and Guide canel is 240 °, roughly select and scan district's magnetic pole and adopt wide magnetic pole in order to improve the rate of recovery, selected district magnetic pole adopts multipole narrow magnetic pole in order to upgrade;
The present invention directly carries out preliminary election operation after adopting an ore grinding, then carry out graded operation, a large amount of qualified tailings of can dishing out in advance, in reducing by ore grinding circulating load, improving scalping efficiency and improve ore grinding raw meal particle size composition, can increase substantially grinding machine disposal ability;
2) the concentrate product that magnetic field magnetic separator sorts rear grade 44～48% in a section feeds secondary dynamic pressure and carries out secondary grading to ore deposit cyclone, secondary dynamic pressure is returned to magnetic field magnetic separator in a section to the sand setting of ore deposit cyclone after long cylinder overflowball mill II is carried out secondary grinding, and to cyclone granularity-200, ore deposit order, more than 90% overflow product feeds one section of drench pit and two sections of weak magnetic separators in secondary dynamic pressure;
In described one section, magnetic field magnetic separator drum surface average field-strength is 200mT, wherein scans district field intensity average out to 250mT, and Guide canel is 135 °;
3) the concentrate product that one section of drench pit and two sections of weak magnetic separators sort rear grade 56～59% feeds one section of electric and magnetic oscillation vibrating dusting cover, the oversize of one section electric and magnetic oscillation vibrating dusting cover feeds three dynamic pressures to ore deposit cyclone, the sand setting of No. three cyclones feeds vertical stirring mill III to carry out returning to cyclone No. three times after tertiary grinding, and the more than 90% overflow product of granularity-325 order of No. three cyclones feeds two sections of drench pits and three sections of weak magnetic separators;
Described low-intensity (magnetic) separator is that multipole magnetic is high gradient magnetic separator, and magnetic pole is 8～10, and disk pack angle is 140 °～150 °, and drum surface average field-strength is 180～200mT;
4) the concentrate product that two sections of drench pits and three sections of weak magnetic separators sort rear grade 55～58% feeds two sections of electric and magnetic oscillation vibrating dusting covers, and the oversize of two sections of electric and magnetic oscillation vibrating dusting covers returns to three dynamic pressures to ore deposit cyclone;
Electric and magnetic oscillation vibrating dusting cover screen size of the present invention is for being less than or equal to 76 microns, and percent opening is more than 30%.The present invention adopts the organic assembling of electric and magnetic oscillation vibrating dusting cover and cyclone, has improved tertiary grinding and grading effect, has ensured end product quality;
Drench pit of the present invention is that bottom magnetic is permanent magnet dehydration tank;
5) undersize of one section of electric and magnetic oscillation vibrating dusting cover grade 63～65% and two sections of electric and magnetic oscillation vibrating dusting cover grade 62～64% undersizes merging feed three sections of drench pits and four sections of weak magnetic separators, and the concentrate that sorts rear grade 65～66% becomes final concentrate;
6) in the mine tailing of magnetic field preliminary election machine in large cornerite, one section, the mine tailing of mine tailing, two sections of drench pits and three sections of weak magnetic separators of magnetic field magnetic separator and the mine tailing of three sections of drench pits and four sections of weak magnetic separators merge and become true tailings.
Magnetic field magnetic separator during preliminary election of the present invention and a stages of magnetic separation adopt, other each section sorts the combination that adopts weak magnetic separator and magnetic dewater cone, has both reduced ferromagnetic loss in mine tailing, has improved again final concentrate grade.
Claims (7)
1. Anshan type, containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, comprises ore grinding-classification-magnetic separation, comprises the following steps:
1) granularity-12mm is accounted for more than 93%, more than 7% the feeding a long cylinder overflowball mill I containing the poor magnetic iron ore of ferric carbonate and carry out grinding operation one time of iron grade in full iron grade 17～28%, ferric carbonate, the ore discharge product of ball mill feeds preliminary election machine in magnetic field in large cornerite, concentrate after preliminary election feeds Primary dynamic pressure and carries out scalping operation to ore deposit cyclone, its Primary dynamic pressure returns to grinding machine No. one time to the sand setting of ore deposit cyclone, and to granularity-200 order of ore deposit cyclone, more than 60% overflow product feeds magnetic field magnetic separator in a section to Primary dynamic pressure;
2) the concentrate product that magnetic field magnetic separator sorts rear grade 44～48% in a section feeds secondary dynamic pressure and carries out secondary grading to ore deposit cyclone, secondary dynamic pressure is returned to magnetic field magnetic separator in a section to the sand setting of ore deposit cyclone after long cylinder overflowball mill II is carried out secondary grinding, and to cyclone granularity-200, ore deposit order, more than 90% overflow product feeds one section of drench pit and two sections of weak magnetic separators in secondary dynamic pressure;
3) the concentrate product that one section of drench pit and two sections of weak magnetic separators sort rear grade 56～59% feeds one section of electric and magnetic oscillation vibrating dusting cover, the oversize of one section electric and magnetic oscillation vibrating dusting cover feeds three dynamic pressures to ore deposit cyclone, the sand setting of No. three cyclones feeds vertical stirring mill III to carry out returning to cyclone No. three times after tertiary grinding, and the more than 90% overflow product of granularity-325 order of No. three cyclones feeds two sections of drench pits and three sections of weak magnetic separators;
4) the concentrate product that two sections of drench pits and three sections of weak magnetic separators sort rear grade 55～58% feeds two sections of electric and magnetic oscillation vibrating dusting covers, and the oversize of two sections of electric and magnetic oscillation vibrating dusting covers returns to three dynamic pressures to ore deposit cyclone;
5) undersize of one section of electric and magnetic oscillation vibrating dusting cover grade 63～65% and two sections of electric and magnetic oscillation vibrating dusting cover grade 62～64% undersizes merging feed three sections of drench pits and four sections of weak magnetic separators, and the concentrate that sorts rear grade 65～66% becomes final concentrate;
6) in the mine tailing of magnetic field preliminary election machine in large cornerite, one section, the mine tailing of mine tailing, two sections of drench pits and three sections of weak magnetic separators of magnetic field magnetic separator and the mine tailing of three sections of drench pits and four sections of weak magnetic separators merge and become true tailings.
2. Anshan type according to claim 1 is containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, it is characterized in that preliminary election machine in magnetic field in described large cornerite, adopting High-gradient Magnetic is magnetic pole, drum surface average field-strength is 250mT, Guide canel is 240 °, roughly select and scan district's magnetic pole and adopt wide magnetic pole, selected district magnetic pole adopts multipole narrow magnetic pole.
3. Anshan type according to claim 1 is containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, it is characterized in that in described one section, magnetic field magnetic separator drum surface average field-strength is 200mT, wherein scans district field intensity average out to 250mT, and Guide canel is 135 °.
4. Anshan type according to claim 1 is containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, it is characterized in that described low-intensity (magnetic) separator is that multipole magnetic is high gradient magnetic separator, magnetic pole is 8～10, and disk pack angle is 140 °～150 °, and drum surface average field-strength is 180～200mT.
5. Anshan type according to claim 1 is containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, it is characterized in that described low-intensity (magnetic) separator is that multipole magnetic is high gradient magnetic separator, magnetic pole is 8～10, and disk pack angle is 140 °～150 °, and drum surface average field-strength is 180～200mT.
6. Anshan type according to claim 1, containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, is characterized in that described drench pit is that bottom magnetic is permanent magnet dehydration tank.
7. Anshan type according to claim 1, containing the single magnetic separation process of the poor magnetic iron ore of ferric carbonate, is characterized in that described electric and magnetic oscillation vibrating dusting cover screen size is for being less than or equal to 76 microns, and percent opening is more than 30%.
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| CN105032610A (en) * | 2015-09-16 | 2015-11-11 | 鞍钢集团矿业公司 | High-pressure roller selective comminuting and magnetic separating method for lean magnetite ore |
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| CN105233977A (en) * | 2015-11-05 | 2016-01-13 | 鞍钢集团矿业公司 | Tailing recovery process adopting magnetic separation-circulating roasting-regrinding and magnetic separation method |
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| CN105233976B (en) * | 2015-11-05 | 2017-07-28 | 鞍钢集团矿业有限公司 | Magnetic tailing recovery process is regrinded in preenrichment roasting |
| CN106000638B (en) * | 2016-05-20 | 2017-09-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of refractory iron ore integrates mine tailing iron-extracting process |
| CN106000638A (en) * | 2016-05-20 | 2016-10-12 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for extracting iron from comprehensive tailings of refractory iron ores |
| CN105944833A (en) * | 2016-05-27 | 2016-09-21 | 鞍钢集团矿业公司 | Process for stage grinding-tower milling-magnetic vibrating machine separating lean magnetite ores |
| CN107029869A (en) * | 2017-06-16 | 2017-08-11 | 鞍钢集团矿业有限公司 | A kind of double media of magnetic iron ore, tower mill magnetic shake ore separators sorting process |
| CN107552203A (en) * | 2017-09-25 | 2018-01-09 | 安徽金安矿业有限公司 | A kind of method and device for improving ball mill grinding efficiency |
| CN108672081A (en) * | 2018-07-05 | 2018-10-19 | 鞍钢集团矿业有限公司 | Magnetic iron ore high pressure roller mill wet type pre-selecting-stage grinding-dusting cover tower grinds magnetic separation process |
| CN108993757A (en) * | 2018-07-05 | 2018-12-14 | 鞍钢集团矿业有限公司 | Semi-Autogenous pre-selection-the stage grinding of magnetic iron ore-dusting cover tower grinds magnetic separation process |
| CN108993758A (en) * | 2018-07-05 | 2018-12-14 | 鞍钢集团矿业有限公司 | A kind of fine-grained disseminated grain carbonate chromium depleted zone stone ore-dressing technique |
| CN109201277A (en) * | 2018-09-20 | 2019-01-15 | 鞍钢集团矿业有限公司 | Technique is selected in a kind of Anshan type lean octahedral iron ore mine tailing high efficiente callback again |
| CN110898961A (en) * | 2019-11-27 | 2020-03-24 | 黑龙江工程学院 | Self-circulation grinding and beneficiation method for fine screen |
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