CN104128259B - Anshan type is containing the iron carbonate single magnetic separation process of chromium depleted zone stone - Google Patents
Anshan type is containing the iron carbonate single magnetic separation process of chromium depleted zone stone Download PDFInfo
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Abstract
The present invention relates to a kind of Anshan type containing the iron carbonate single magnetic separation process of chromium depleted zone stone, comprise ore grinding-classification-magnetic separation, comprise the following steps: to comprise magnetic field magnetic separator preliminary election three cyclone classifications three sections dehydration two sections of dusting covers and four stage magnetic separator magnetic separation in three big cornerites of ore grinding. The present invention adopts the process of single magnetic selection method to provide a kind of energy-conservation reliable production technique with low-carbon environment-friendly containing iron carbonate chromium depleted zone stone, while improving ore grinding, classification and sorting efficiency, can further improve processing power, improving environment and economic target, reduction production cost, increase substantially the level of resources utilization inferior.
Description
Technical field
The invention belongs to technical field of beneficiation, particularly relate to a kind of Anshan type containing the iron carbonate single magnetic separation process of chromium depleted zone stone.
Background technology
Anshan type lean octahedral iron ore belongs to sedimentary metamorphic mineral deposit, is the iron ore that a kind of particulate is contaminated. The natural type of ore is mainly iron content quartzite, is made up of quartz (or hornblende) and magnetite (containing part martite), and major constituents is ribbon and disseminated. Anshan type lean octahedral iron ore stone belongs to the poor iron ore of high silicon, low sulphur phosphorus, red, limonite content is less, and its disseminated grain size is thin and uneven.
Character according to Anshan type lean octahedral iron ore stone, current domestic and international most of dressing-works generally all have employed stage grinding one magnetic separation-Fine screening-regrinding technology flow process and to complete the ore grinding of ore and sorts, and dressing-works all achieves relatively good sorting index mostly.
Anshan type belongs to a kind of specific type in Anshan type lean octahedral iron ore containing iron carbonate chromium depleted zone, although still belonging to sedimentary metamorphic mineral deposit and the iron ore of particulate dip-dye, but its ore natural type is mainly magnetite quartzite, magnet vacation forms as Chi Tieshiyingyan and water chestnut sinople rock etc. as Chi Tieshiyingyan, the vacation of magnet water chestnut iron. 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 magnetic iron level is lower than general chromium depleted zone, iron carbonate content is relatively high, also with a small amount of illusion, half illusion and hematite-limonite thing, Iron grade magnetite low about 5��10% poorer than general Anshan type, Anshan type containing iron carbonate chromium depleted zone iron mineral and the disseminated grain size of gangue mineral compared with general Anshan type lean octahedral iron ore thinner, owing to 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, such ore not only difficult mill but also difficult choosing, technique of preparing economic target is poor, and the past is generally discarded in mining junkyard as rock in mining process. at present treatment process for the magnetic iron ore of high carbon acid iron level is: become magnetite by neutral Roasting Decomposition when 1, being heated to 300��400C �� at not blowing air or when leading to a small amount of air, then process for producing iron ore concentrate is continued by beneficiation methods such as magnetic separation, current domestic Jin You only a few enterprise adopts in this way, and the critical defect of this kind of method existence is production cost height, energy consumption height, Air quality is easily polluted by the obnoxious flavour that particularly roasting process produces, 2, process at present is employing drastic reduction-efficient separation technology containing the process technology that the refractory ores such as iron carbonate are up-to-date, the ore being about to be crushed to certain particle size is lower than its melt temperature when, it is reduced into metallic iron with reductive agent (such as coal dust), the metallic iron atom restored at a certain temperature can natural shrinking, constantly annex and grow up, finally grow up to the iron particle of certain particle size, grog after reduction is through water quenching cooling, iron particle and gangue two-phase interface are shunk, be conducive to dissociating of iron granule and gangue in follow-up ore grinding, higher-grade can be obtained after sorting, high-recovery, the product of high degree of metalization, this product can replace steel scrap to enter steelmaking process after briquetting, this kind of technology is just in the experimental study stage at present, not examples of industrial application, although this kind of technique can improve the concentration effect of metallic iron, but there is energy consumption height equally and environment had the problems such as impact in this kind of technique.
Anshan Iron and Steel Group of mining company have proven reserve about 1.2 hundred million tons containing iron carbonate chromium depleted zone stone, owing to iron carbonate content in ore is on average more than 9%, discard in decades always and do not exploited utilization, in recent years along with imported Fe ore and the continuous of iron ore concentrate price are risen, also favourable outside atmosphere is created to the development and utilization of this kind of ore resource, within 2007, Anshan iron and steel plant mining industry design and research institute is according to the boring sample of exploration during the geologic prospect of geologic prospect institute of Liaoning Province, the sample ore substantially representing little butte mining area ore character it is mixed with in conjunction with geologic report, carry out ore beneficiation feasibility experimental study, at head grade 27.92%, iron carbonate content 9.85%, adopt " three sections of ore grindings, discarding coarse tailing, magnetic concentrate regrinding selects again " technical process sorts, laboratory test obtains concentrate grade 65.35%, tailings grade 17.55%, the test-results of concentrate yield 21.70%, the Great Hermit Hill pelletizing factory of Anshan iron and steel plant group adopted " stage grinding-single magnetic separation-Fine screening-regrinding technology " of original process general Anshan type lean octahedral iron ore stone to process Anshan type containing iron carbonate chromium depleted zone stone accordingly from 2010, achieve the productive capacity close with lab index.
At present; sort the chromium depleted zone stone of Anshan type containing iron carbonate less than 6%; general employing " stage grinding-single magnetic separation-Fine screening-regrinding technology " but the continuous checking along with production practice, this kind for the treatment of process also exposes many obvious defects: one is owing to such ore disseminated grain size is thin, magnetic mineral content is relatively low, therefore original Grinding procedure product granularity often cannot meet the needs realizing monomer dissociation, cause concentrate grade on the low side and fluctuate big, it is very difficult to reach the index of laboratory concentrate grade more than 65%; Two is that original first and second grind grading plant efficiency is low, there is overground phenomenon, and when in ore milling product, mineral liberation degree is on the low side ,-10 microns of content but obviously increase, it is easy to cause the loss sorting magnetic iron in process metal loss, particularly mine tailing; Three is the common low intensity magnetic separator that an original sorting equipment is below magneticstrength 200mT, and its mine tailing product rate accounts for more than the 80% of total mine tailing product rate, is not suitable with containing iron carbonate chromium depleted zone stone, equally easily causes metal loss; Four is that three grinding grading techniques 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 height, and the level of resources utilization is low, production cost height.
Summary of the invention
It is an object of the invention to contain character and the feature of iron carbonate chromium depleted zone stone according to Anshan type, for upper
State defect and the deficiency of original technique and technology existence, a kind of economy, Anshan type efficient, environmental protection is provided to contain the iron carbonate single magnetic separation process of chromium depleted zone stone, while improving ore grinding, classification and sorting efficiency, improve sorting index, reduce production cost, improve the level of resources utilization inferior, it is achieved the energy-conservation target with low-carbon environment-friendly.
It is an object of the invention to be realized by following technical proposals:
Contain the iron carbonate single magnetic separation process of chromium depleted zone stone according to a kind of Anshan type of the present invention, comprise ore grinding-classification-magnetic separation, comprise the following steps:
1) granularity-12mm accounts for more than 93%, Iron grade more than 7% feeds long cylinder overflow ball mill I containing iron carbonate chromium depleted zone stone and carries out a grinding operation in full Iron grade 17��28%, iron carbonate, the ore discharge product of ball mill feeds preliminary election machine in magnetic field in big cornerite, concentrate after preliminary election feeds Primary dynamic pressure and carries out scalping operation to ore deposit swirler, its Primary dynamic pressure returns a grinding machine to the heavy sand of ore deposit swirler, and Primary dynamic pressure feeds magnetic field magnetic separator in a section to the overflow product of granularity-200 order more than 60% of ore deposit swirler;
2) the concentrate product that magnetic field magnetic separator sorts rear grade 44��48% in a section feeds two dynamic pressures and carries out secondary grading to ore deposit swirler, two dynamic pressures return magnetic field magnetic separator in a section to the heavy sand of ore deposit swirler after long cylinder overflow ball mill II carries out two ore grindings, and two dynamic pressures feed one section of dewatering tank and two sections of weak magnetic separators to the overflow product of ore deposit swirler granularity-200 order more than 90%;
3) the concentrate product that one section of dewatering tank 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 swirler, the heavy sand of No. three swirlers feeds after vertical stirring mill III carries out three ore grindings and returns No. three swirlers, and the overflow product of granularity-325 order more than 90% of No. three swirlers feeds two sections of dewatering tanks and three sections of weak magnetic separators;
4) the concentrate product that two sections of dewatering tanks 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 three dynamic pressures to ore deposit swirler;
5) screen 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% screen undersizes merge and feed three sections of dewatering tanks and four sections of weak magnetic separators, and the concentrate sorting rear grade 65��66% becomes final concentrate;
6) in big cornerite magnetic field preliminary election machine mine tailing, the mine tailing of magnetic field magnetic separator, two sections of dewatering tanks and the mine tailing of three sections of weak magnetic separators and the mine tailing of three sections of dewatering tanks and four sections of weak magnetic separators merge in one section becomes true tailings.
Above-mentioned Anshan type is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, and preliminary election machine in magnetic field in described big cornerite, adopts High-gradient Magnetic system magnetic pole, the average field intensity of drum surface 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 the narrow magnetic pole of multipole.
In described one section, the average field intensity of magnetic field magnetic separator drum surface is 200mT, and wherein scanning district's field intensity is on average 250mT, and Guide canel is 135 ��.
Described low intensity magnetic separator is multipole magnetic system high gradient magnetic separator, and magnetic pole is 8��10, and magnetic cornerite is 140 �㡫150 ��, and the average field intensity of drum surface is 180��200mT.
Described low intensity magnetic separator is multipole magnetic system high gradient magnetic separator, and magnetic pole is 8��10, and magnetic cornerite is 140 �㡫150 ��, and the average field intensity of drum surface is 180��200mT.
Described dewatering tank is bottom magnetic system permanent magnet dehydration tank.
Described electric and magnetic oscillation vibrating dusting cover size of mesh is for being less than or equal 76 microns, and percentage of open area is more than 30%.
It is an advantage of the invention that:
1) after completing an ore grinding, preliminary election operation is directly carried out owing to have employed, then graded operation is carried out, can dish out in advance a large amount of qualified tailings, while reducing by ore grinding circulating load, a raising scalping efficiency and improving ore grinding raw meal particle size composition, grinding machine processing power can be increased substantially;
2) the present invention first and second ore grinding adopts long cylinder overflow type grinding machine, three ore grindings adopt vertical stirring mills, it is to increase grinding efficiency, ensure that ore milling product granularity;
3) the present invention is directed to Anshan type containing iron carbonate chromium depleted zone stone characteristic, preliminary election and a stages of magnetic separation adopt in magnetic field magnetic separator, other each section sorts the combination adopting weak magnetic separator and magnetic dewater cone, had both decreased the loss of magnetic iron in mine tailing, and turn improved final concentrate grade;
4) the present invention adopts the organic assembling of electric and magnetic oscillation vibrating dusting cover and swirler, improves three ore grindings and grading effect, has ensured end product quality.
The present invention adopts the process of single magnetic selection method to provide a kind of energy-conservation reliable production technique with low-carbon environment-friendly containing iron carbonate chromium depleted zone stone, while improving ore grinding, classification and sorting efficiency, can further improve processing power, improving environment and economic target, reduction production cost, increase substantially the level of resources utilization inferior.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is described in detail.
As shown in Figure 1, contain the iron carbonate single magnetic separation process of chromium depleted zone stone according to a kind of Anshan type of the present invention, comprise ore grinding-classification-magnetic separation, comprise the following steps:
1) granularity-12mm accounts for more than 93%, Iron grade more than 7% feeds long cylinder overflow ball mill I containing iron carbonate chromium depleted zone stone and carries out a grinding operation in full Iron grade 17��28%, iron carbonate, the ore discharge product of ball mill feeds preliminary election machine in magnetic field in big cornerite, concentrate after preliminary election feeds Primary dynamic pressure and carries out scalping operation to ore deposit swirler, its Primary dynamic pressure returns a grinding machine to the heavy sand of ore deposit swirler, and Primary dynamic pressure feeds magnetic field magnetic separator in a section to the overflow product of granularity-200 order more than 60% of ore deposit swirler;
Preliminary election machine in magnetic field in described big cornerite, adopting High-gradient Magnetic system magnetic pole, the average field intensity of drum surface is 250mT, and Guide canel is 240 ��, roughly selecting and scan district's magnetic pole adopts wide magnetic pole in order to improve the rate of recovery, and selected district magnetic pole adopts the narrow magnetic pole of multipole in order to upgrade;
The present invention directly carries out preliminary election operation after adopting an ore grinding, then graded operation is carried out, can dish out in advance a large amount of qualified tailings, reducing by ore grinding circulating load, improve scalping efficiency and improve while ore grinding raw meal particle size forms, grinding machine processing power can be increased substantially;
2) the concentrate product that magnetic field magnetic separator sorts rear grade 44��48% in a section feeds two dynamic pressures and carries out secondary grading to ore deposit swirler, two dynamic pressures return magnetic field magnetic separator in a section to the heavy sand of ore deposit swirler after long cylinder overflow ball mill II carries out two ore grindings, and two dynamic pressures feed one section of dewatering tank and two sections of weak magnetic separators to the overflow product of ore deposit swirler granularity-200 order more than 90%;
In described one section, the average field intensity of magnetic field magnetic separator drum surface is 200mT, and wherein scanning district's field intensity is on average 250mT, and Guide canel is 135 ��;
3) the concentrate product that one section of dewatering tank 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 swirler, the heavy sand of No. three swirlers feeds after vertical stirring mill III carries out three ore grindings and returns No. three swirlers, and the overflow product of granularity-325 order more than 90% of No. three swirlers feeds two sections of dewatering tanks and three sections of weak magnetic separators;
Described low intensity magnetic separator is multipole magnetic system high gradient magnetic separator, and magnetic pole is 8��10, and magnetic cornerite is 140 �㡫150 ��, and the average field intensity of drum surface is 180��200mT;
4) the concentrate product that two sections of dewatering tanks 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 three dynamic pressures to ore deposit swirler;
Electric and magnetic oscillation vibrating dusting cover size of mesh of the present invention is for being less than or equal 76 microns, and percentage of open area is more than 30%. The present invention adopts the organic assembling of electric and magnetic oscillation vibrating dusting cover and swirler, improves three ore grindings and grading effect, has ensured end product quality;
Dewatering tank of the present invention is bottom magnetic system permanent magnet dehydration tank;
5) screen 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% screen undersizes merge and feed three sections of dewatering tanks and four sections of weak magnetic separators, and the concentrate sorting rear grade 65��66% becomes final concentrate;
6) in big cornerite magnetic field preliminary election machine mine tailing, the mine tailing of magnetic field magnetic separator, two sections of dewatering tanks and the mine tailing of three sections of weak magnetic separators and the mine tailing of three sections of dewatering tanks and four sections of weak magnetic separators merge in one section becomes true tailings.
Preliminary election of the present invention and a stages of magnetic separation adopt in magnetic field magnetic separator, other each section sorts the combination adopting weak magnetic separator and magnetic dewater cone, had both decreased the loss of magnetic iron in mine tailing, and turn improved final concentrate grade.
Claims (6)
1. Anshan type is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, comprises ore grinding-classification-magnetic separation, comprises the following steps:
1) granularity-12mm accounts for more than 93%, Iron grade more than 7% feeds long cylinder overflow ball mill I containing iron carbonate chromium depleted zone stone and carries out a grinding operation in full Iron grade 17��28%, iron carbonate, the ore discharge product of ball mill feeds preliminary election machine in magnetic field in big cornerite, concentrate after preliminary election feeds Primary dynamic pressure and carries out scalping operation to ore deposit swirler, its Primary dynamic pressure returns a grinding machine to the heavy sand of ore deposit swirler, and Primary dynamic pressure feeds magnetic field magnetic separator in a section to the overflow product of granularity-200 order more than 60% of ore deposit swirler;
2) the concentrate product that magnetic field magnetic separator sorts rear grade 44��48% in a section feeds two dynamic pressures and carries out secondary grading to ore deposit swirler, two dynamic pressures return magnetic field magnetic separator in a section to the heavy sand of ore deposit swirler after long cylinder overflow ball mill II carries out two ore grindings, and two dynamic pressures feed one section of dewatering tank and two sections of weak magnetic separators to the overflow product of ore deposit swirler granularity-200 order more than 90%;
3) the concentrate product that one section of dewatering tank 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 swirler, the heavy sand of No. three swirlers feeds after vertical stirring mill III carries out three ore grindings and returns No. three swirlers, and the overflow product of granularity-325 order more than 90% of No. three swirlers feeds two sections of dewatering tanks and three sections of weak magnetic separators;
4) the concentrate product that two sections of dewatering tanks 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 three dynamic pressures to ore deposit swirler;
5) screen 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% screen undersizes merge and feed three sections of dewatering tanks and four sections of weak magnetic separators, and the concentrate sorting rear grade 65��66% becomes final concentrate;
6) in big cornerite magnetic field preliminary election machine mine tailing, the mine tailing of magnetic field magnetic separator, two sections of dewatering tanks and the mine tailing of three sections of weak magnetic separators and the mine tailing of three sections of dewatering tanks and four sections of weak magnetic separators merge in one section becomes true tailings.
2. Anshan type according to claim 1 is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, it is characterized in that preliminary election machine in magnetic field in described big cornerite, adopt High-gradient Magnetic system magnetic pole, the average field intensity of drum surface is 250mT, Guide canel is 240 ��, roughly selecting and scan district's magnetic pole and adopt wide magnetic pole, selected district magnetic pole adopts the narrow magnetic pole of multipole.
3. Anshan type according to claim 1 is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, it is characterised in that in described one section, the average field intensity of magnetic field magnetic separator drum surface is 200mT, and wherein scanning district's field intensity is on average 250mT, and Guide canel is 135 ��.
4. Anshan type according to claim 1 is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, it is characterized in that described weak magnetic separator is multipole magnetic system high gradient magnetic separator, magnetic pole is 8��10, and magnetic cornerite is 140 �㡫150 ��, and the average field intensity of drum surface is 180��200mT.
5. Anshan type according to claim 1 is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, it is characterised in that described dewatering tank is bottom magnetic system permanent magnet dehydration tank.
6. Anshan type according to claim 1 is containing the iron carbonate single magnetic separation process of chromium depleted zone stone, it is characterised in that described electric and magnetic oscillation vibrating dusting cover size of mesh is for being less than or equal 76 microns, and percentage of open area is more than 30%.
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| 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 |
| CN108672081B (en) * | 2018-07-05 | 2020-08-21 | 鞍钢集团矿业有限公司 | Magnetite high-pressure roller grinding wet preselection-stage grinding-fine sieve tower grinding magnetic separation process |
| 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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