CN105233974A - Fine grinding magnetic separation-roasting-regrinding magnetic separation tailing recovery process - Google Patents
Fine grinding magnetic separation-roasting-regrinding magnetic separation tailing recovery process Download PDFInfo
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- CN105233974A CN105233974A CN201510742449.XA CN201510742449A CN105233974A CN 105233974 A CN105233974 A CN 105233974A CN 201510742449 A CN201510742449 A CN 201510742449A CN 105233974 A CN105233974 A CN 105233974A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a fine grinding magnetic separation-roasting-regrinding magnetic separation tailing recovery process. The process is characterized by adopting three-section magnetic separation, three-section cyclone closed-circuit grinding classification operation, roasting and regrinding magnetic separation. A second-section cylindrical magnetic concentrate is singly grinded to reach a particle size of -0.025 mm above 90%; then, the first-section weak magnetic separation is performed to realize sufficient and effective separation of a strong magnetic ore and a weak magnetic ore from a gangue; a first-section weak magnetic concentrate is directly fed to a subsequent weak magnetic separation operation; and when the iron mineral recovery rate is guaranteed, the roasting operation handling capacity is reduced, and the excellent indexes of the concentrate with grade above 65% and yield above 9%, the tailing grade of 5-7% and the metal recovery rate above 53% are obtained.
Description
Technical field
The invention belongs to iron ore beneficiation technical field, mine tailing technique is reclaimed in particularly a kind of fine grinding magnetic separation-roasting-magnetic separation of regrinding.
Background technology
Select factory to produce 10% ~ 15% of current employing " stage grinding, coarse and fine separation; weight-magnetic-floating combined process flow ", grinding particle size is iron mineral mainly russet iron and the Armco magnetic iron run off in the comprehensive mine tailing of-0.074mm60% ~ 70%, to the good technique of the current effect of the recovery of comprehensive mine tailing be: adopt two sections of spiral chutes, permanent magnetism to scan with comprehensive mine tailing, spiral shell is smart, permanent magnetism is smart is mixed into rough concentrate, again with weak magnetic, Qiang Ci after rough concentrate ore grinding, reverse flotation or centrifuge technique selected." spiral chute, permanent magnetism-ore grinding-strong magnetic, centrifuge technique " flow process is adopted to sort the comprehensive ore deposit of bloodstone, the sorting index obtained when grinding particle size is 92.5%-0.046mm is: to ore deposit grade 12.63%, concentrate grade 67.95%, concentrate yield 4.00%, the rate of recovery 21.52%, tailings grade 10.33%, but because the distributive law of the iron mineral in comprehensive mine tailing in below 0.037mm grade is up to more than 70%, distributive law wherein in below 0.01mm grade is 10% ~ 20%, and the main iron mineral granularity in comprehensive mine tailing is very thin.Therefore the comprehensive mine tailing problem that tailings grade is higher after " spiral chute, permanent magnetism-ore grinding-strong magnetic, centrifuge technique " sorts cannot solve, and causes the rate of recovery to be difficult to further raising." magnetic separation-roasting-magnetic separation process " adopts weak magnetic to sort to roasted ore again after the high intensity magnetic mineral obtained all being carried out roasting after adopt strong magnetic to sort to mine tailing, although this technique improves the rate of recovery, but because Armco magnetic iron distributive law in mine tailing is 15% ~ 40%, and this part product should not enter complex process (because needing before roasting to concentrate, filtering, oven dry etc.), energy consumption is high, cost is high roasting technique processes.
Summary of the invention
The object of this invention is to provide and a kind ofly can be mainly superfine grade to target minreal and carry out economical and effective recovery containing the mine tailing of multiple iron mineral, thus realize improving the rate of recovery, mine tailing technique is reclaimed in the fine grinding magnetic separation-roasting-magnetic separation of regrinding simultaneously reducing effective recovery of energy consumption.
The object of the invention is to be realized by following technical proposals:
Mine tailing technique is reclaimed in fine grinding magnetic separation-roasting of the present invention-magnetic separation of regrinding, comprising grade is 10% ~ 15%, granularity is that the comprehensive mine tailing of-0.074mm60% ~ 70% feeds one section of drum magnetic separator and carries out magnetic concentration working, the mine tailing of one section of drum magnetic separator feeds one section of vertical-ring magnetic separator and carries out magnetic concentration working, the concentrate of the concentrate of one section of drum magnetic separator and one section of vertical-ring magnetic separator merges the closed circuit grinding classification operation feeding one section of cyclone and one section of ball mill and form, that is: the concentrate of one section of drum magnetic separator and the concentrate merging of one section of vertical-ring magnetic separator feed one section of cyclone, the sand setting of one section of cyclone feeds one section of ball milling, the ore discharge of one section of ball milling returns one section of cyclone, the overflow of one section of cyclone of granularity 90% ~ 95%-0.074mm feeds two sections of drum magnetic separators and carries out magnetic concentration working, characterized by further comprising the following step:
1) concentrate of two sections of drum magnetic separators feeds two sections of cyclones, the sand setting of two sections of cyclones feeds two sections of tower mills, the ore discharge of two sections of tower mills returns two sections of cyclones and forms closed circuit grinding system, secondary grinding graded operation product granularity is more than 90%-0.025mm, the overflow of two sections of cyclones feeds one section of weak magnetic and sorts, one section of weak magnetic tail ore deposit feeds one section of concentrator and carries out concentrated operation together with two sections of drum magnetic separator mine tailings, the overflow of one section of concentrator uses as recirculated water, concentration is that the underflow of one section of close machine of 30% ~ 40% feeds two sections of vertical-ring magnetic separators and carries out magnetic concentration working, the mine tailing of two sections of vertical-ring magnetic separators throws tail, the concentrate of two sections of vertical-ring magnetic separators feeds two sections of concentrators and carries out concentrated operation,
2) overflow of two sections of concentrators uses as recirculated water, and be that the underflow of two sections of concentrators of 55% ~ 60% feeds filter and filters by concentration, obtaining filter cake is rough concentrate, and its moisture content is 9% ~ 13%, and grade is 25% ~ 33%, productive rate is 15% ~ 20%;
3) described rough concentrate is fed suspending magnetization roasting furnace by belt and carry out suspension roasting operation, its sintering temperature is 500 DEG C ~ 600 DEG C, after making rough concentrate moisture content reach 2%, then passes into
cOreducing gas is reduced to the Armco magnetic iron mineral of Armco magnetic iron distributive law more than 88%;
4) the Armco magnetic iron mineral of post-job for suspension roasting Armco magnetic iron distributive law more than 88% are fed three sections of cyclones, the sand setting of three sections of cyclones feeds three sections of tower mills, the ore discharge of three sections of tower mills returns three sections of cyclones and forms closed circuit grinding system, three sections of grinding-classification operation product granularities are more than 90%-0.025mm, and the overflow of three sections of cyclones feeds two sections of weak magnetic machines;
5) one section of weak magnetic machine and two sections of weak magnetic machine concentrate merging feed three sections of weak magnetic machines, the concentrate of three sections of weak magnetic machines feeds four sections of weak magnetic machines, the concentrate of four sections of weak magnetic machines feeds five sections of dehydration magnetic separators, five sections of dehydration magnetic separator concentrate are final concentrate, its concentrate grade more than 65%, metal recovery rate more than 53%, the true tailings of grade 5% ~ 7% is merged in one section of vertical-ring magnetic separator, two sections of vertical-ring magnetic separator mine tailings and one section of weak magnetic tail ore deposit, two sections of weak magnetic tail ore deposits, three sections of weak magnetic tail ore deposits, four sections of weak magnetic tail ore deposits and five sections of weak magnetic tail ore deposits.
The magnetic induction intensity of one section of described drum magnetic separator is 300 ~ 500mT, the magnetic induction intensity 300 ~ 500mT of one section of vertical-ring magnetic separator.
The magnetic induction intensity of two sections of described drum magnetic separators is 150 ~ 180mT, the magnetic induction intensity 300 ~ 500mT of two sections of vertical-ring magnetic separators.
Described five sections weak magnetic machines adopt magnetovibration highly-effective magnetic separator.
Advantage of the present invention is:
The present invention reclaims mine tailing technique owing to have employed above-mentioned fine grinding magnetic separation-roasting-magnetic separation of regrinding, at head grade 10% ~ 15%, under the condition of final more than grinding particle size-0.025mm90%, to other through one section of low intensity magnetic separation after two sections of cartridge type magnetic essences separately ore grinding to more than granularity-0.025mm90%, strongly magnetic mineral and weak magnetic mineral and gangue is made to realize fully effectively being separated, one section of weak magnetic essence directly feeds the other operation of follow-up low intensity magnetic separation, while ensure that the iron mineral rate of recovery, decrease roasting operation treating capacity, obtain grade more than 65%, the concentrate of productive rate more than 9%, tailings grade 5% ~ 7%, the good index of metal recovery rate more than 53%, this technique achieves the high efficiente callback of iron in mine tailing, its rate of recovery comparatively traditional handicraft improves more than 30 percentage points, save production cost simultaneously, the mine tailing being suitable for being mainly target minreal superfine grade iron mineral carries out economical and effective recovery.
Accompanying drawing explanation
Fig. 1 is the flow chart that mine tailing technique is reclaimed in preenrichment of the present invention-fine grinding roasting-magnetic separation of regrinding.
Detailed description of the invention
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, mine tailing technique is reclaimed in fine grinding magnetic separation-roasting of the present invention-magnetic separation of regrinding, the comprehensive mine tailing of-0.074mm60% ~ 70% that comprises grade that to be 10% ~ 15% granularity be feeds one section of drum magnetic separator and carries out magnetic concentration working, the mine tailing of one section of drum magnetic separator feeds one section of vertical-ring magnetic separator and carries out magnetic concentration working, the concentrate of the concentrate of one section of drum magnetic separator and one section of vertical-ring magnetic separator merges the closed circuit grinding classification operation feeding one section of cyclone and one section of ball mill and form, that is: the concentrate of one section of drum magnetic separator and the concentrate merging of one section of vertical-ring magnetic separator feed one section of cyclone, the sand setting of one section of cyclone feeds one section of ball milling, the ore discharge of one section of ball milling returns one section of cyclone, the overflow of one section of cyclone of granularity 90% ~ 95%-0.074mm feeds two sections of drum magnetic separators and carries out magnetic concentration working, characterized by further comprising the following step:
1) concentrate of two sections of drum magnetic separators feeds two sections of cyclones, the sand setting of two sections of cyclones feeds two sections of tower mills, the ore discharge of two sections of tower mills returns two sections of cyclones and forms closed circuit grinding system, secondary grinding graded operation product granularity is more than 90%-0.025mm, iron mineral degree of dissociation reaches more than 80%, the overflow of two sections of cyclones feeds one section of weak magnetic and sorts, sort in rear one section of inferior fine magnetite concentrate and be mainly strongly magnetic mineral, mainly monomer gangue in one section of weakly magnetic tailings, weak magnetic mineral and intergrowth, one section of weak magnetic tail ore deposit feeds one section of concentrator and carries out concentrated operation together with two sections of drum magnetic separator mine tailings, the overflow of one section of concentrator uses as recirculated water, concentration is that the underflow of one section of close machine of 30% ~ 40% feeds two sections of vertical-ring magnetic separators and carries out magnetic concentration working, the mine tailing of two sections of vertical-ring magnetic separators throws tail, the concentrate of two sections of vertical-ring magnetic separators feeds two sections of concentrators and carries out concentrated operation,
The magnetic induction intensity of one section of described drum magnetic separator is 300 ~ 500mT, the magnetic induction intensity 300 ~ 500mT of one section of vertical-ring magnetic separator.
The magnetic induction intensity of two sections of described drum magnetic separators is 150 ~ 180mT, the magnetic induction intensity 300 ~ 500mT of two sections of vertical-ring magnetic separators.
2) overflow of two sections of concentrators uses as recirculated water, and be that the underflow of two sections of concentrators of 55% ~ 60% feeds filter and filters by concentration, obtaining filter cake is rough concentrate, and its moisture content is 9% ~ 13%, and grade is 25% ~ 33%, productive rate is 15 ~ 20%;
3) described rough concentrate is fed suspending magnetization roasting furnace by belt and carry out suspension roasting operation, its sintering temperature is 500 DEG C ~ 600 DEG C, after making rough concentrate moisture content reach 2%, then passes into
cOreducing gas is reduced to the Armco magnetic iron mineral of Armco magnetic iron distributive law more than 88%;
4) the Armco magnetic iron mineral of post-job for suspension roasting Armco magnetic iron distributive law more than 88% are fed three sections of cyclones, the sand setting of three sections of cyclones feeds three sections of tower mills, the ore discharge of three sections of tower mills returns three sections of cyclones and forms closed circuit grinding system, three sections of grinding-classification operation product granularities are more than 90%-0.025mm, and the overflow of three sections of cyclones feeds two sections of weak magnetic machines;
5) one section of weak magnetic machine and two sections of weak magnetic machine concentrate merging feed three sections of weak magnetic machines, the concentrate of three sections of weak magnetic machines feeds four sections of weak magnetic machines, the concentrate of four sections of weak magnetic machines feeds five sections of dehydration magnetic separators, described five sections weak magnetic machines adopt magnetovibration highly-effective magnetic separator, five sections of dehydration magnetic separator concentrate are final concentrate, its concentrate grade more than 65%, metal recovery rate more than 53%, one section of vertical-ring magnetic separator, two sections of vertical-ring magnetic separator mine tailings and one section of weak magnetic tail ore deposit, two sections of weak magnetic tail ore deposits, three sections of weak magnetic tail ore deposits, the true tailings of grade 5% ~ 7% is merged in four sections of weak magnetic tail ore deposits and five sections of weak magnetic tail ore deposits.
The present invention sorts in district some magnetic-assemblying areas, Shan Zhen district, magnetic linkage is formed through magnetic-assemblying area magnetic mineral when ore pulp enters point constituency, magnetic linkage is smashed again when moving downward through Shan Zhen district again, non magnetic ore is overflowed with ascending current, like this through repeatedly poly-magnetic, sudden strain of a muscle are shaken, gangue is fully separated with iron mineral, realizes the effective recovery to superfine rank iron mineral.
The parameters such as grinding particle size of the present invention, magnetic field intensity, thickness grading granularity, all will according to the character of ore, and result of study is determined by experiment.
Adopt technique of the present invention, achieve the high efficiente callback of iron in mine tailing, its rate of recovery comparatively traditional handicraft improves more than 30 percentage points.
Claims (4)
1. mine tailing technique is reclaimed in fine grinding magnetic separation-roasting-magnetic separation of regrinding, the comprehensive mine tailing of-0.074mm60% ~ 70% that comprises grade that to be 10% ~ 15% granularity be feeds one section of drum magnetic separator and carries out magnetic concentration working, the mine tailing of one section of drum magnetic separator feeds one section of vertical-ring magnetic separator and carries out magnetic concentration working, the concentrate of the concentrate of one section of drum magnetic separator and one section of vertical-ring magnetic separator merges the closed circuit grinding classification operation feeding one section of cyclone and one section of ball mill and form, that is: the concentrate of one section of drum magnetic separator and the concentrate merging of one section of vertical-ring magnetic separator feed one section of cyclone, the sand setting of one section of cyclone feeds one section of ball milling, the ore discharge of one section of ball milling returns one section of cyclone, the overflow of one section of cyclone of granularity 90% ~ 95%-0.074mm feeds two sections of drum magnetic separators and carries out magnetic concentration working, characterized by further comprising the following step:
1) concentrate of two sections of drum magnetic separators feeds two sections of cyclones, the sand setting of two sections of cyclones feeds two sections of tower mills, the ore discharge of two sections of tower mills returns two sections of cyclones and forms closed circuit grinding system, secondary grinding graded operation product granularity is more than-0.025mm90%, the overflow of two sections of cyclones feeds one section of weak magnetic and sorts, one section of weak magnetic tail ore deposit feeds one section of concentrator and carries out concentrated operation together with two sections of drum magnetic separator mine tailings, the overflow of one section of concentrator uses as recirculated water, concentration is that the underflow of one section of close machine of 30 ~ 40% feeds two sections of vertical-ring magnetic separators and carries out magnetic concentration working, the mine tailing of two sections of vertical-ring magnetic separators throws tail, the concentrate of two sections of vertical-ring magnetic separators feeds two sections of concentrators and carries out concentrated operation,
2) overflow of two sections of concentrators uses as recirculated water, and be that the underflow of two sections of concentrators of 55% ~ 60% feeds filter and filters by concentration, obtaining filter cake is rough concentrate, and its moisture content is 9% ~ 13%, and grade is 25% ~ 33%, productive rate is 15% ~ 20%;
3) described rough concentrate is fed suspending magnetization roasting furnace by belt and carry out suspension roasting operation, its sintering temperature is 500 DEG C ~ 600 DEG C, after making rough concentrate moisture content reach 2%, then passes into
cOreducing gas is reduced to the Armco magnetic iron mineral of Armco magnetic iron distributive law more than 88%;
4) the Armco magnetic iron mineral of post-job for suspension roasting Armco magnetic iron distributive law more than 88% are fed three sections of cyclones, the sand setting of three sections of cyclones feeds three sections of tower mills, the ore discharge of three sections of tower mills returns three sections of cyclones and forms closed circuit grinding system, three sections of grinding-classification operation product granularities are more than 90%-0.025mm, and the overflow of three sections of cyclones feeds two sections of weak magnetic machines;
5) one section of weak magnetic machine and two sections of weak magnetic machine concentrate merging feed three sections of weak magnetic machines, the concentrate of three sections of weak magnetic machines feeds four sections of weak magnetic machines, the concentrate of four sections of weak magnetic machines feeds five sections of dehydration magnetic separators, five sections of dehydration magnetic separator concentrate are final concentrate, its concentrate grade more than 65%, metal recovery rate more than 53%, the true tailings of grade 5% ~ 7% is merged in one section of vertical-ring magnetic separator, two sections of vertical-ring magnetic separator mine tailings and one section of weak magnetic tail ore deposit, two sections of weak magnetic tail ore deposits, three sections of weak magnetic tail ore deposits, four sections of weak magnetic tail ore deposits and five sections of weak magnetic tail ore deposits.
2. mine tailing technique is reclaimed in fine grinding magnetic separation-roasting according to claim 1-magnetic separation of regrinding, and it is characterized in that the magnetic induction intensity of one section of described drum magnetic separator is 300 ~ 500mT, the magnetic induction intensity 300 ~ 500mT of one section of vertical-ring magnetic separator.
3. mine tailing technique is reclaimed in fine grinding magnetic separation-roasting according to claim 1-magnetic separation of regrinding, and it is characterized in that the magnetic induction intensity of two sections of described drum magnetic separators is 150 ~ 180mT, the magnetic induction intensity 300 ~ 500mT of two sections of vertical-ring magnetic separators.
4. mine tailing technique is reclaimed in fine grinding magnetic separation-roasting according to claim 1-magnetic separation of regrinding, and it is characterized in that five sections of described magnetic machines adopt magnetovibration highly-effective magnetic separator.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105772216A (en) * | 2016-03-28 | 2016-07-20 | 东北大学 | Novel method for producing iron concentrates through complex refractory iron ore |
| CN106362858A (en) * | 2016-10-14 | 2017-02-01 | 鞍钢集团矿业有限公司 | Process for extracting cement-replacing superfine iron tailing powder from iron tailings |
| CN107096638A (en) * | 2017-06-16 | 2017-08-29 | 鞍钢集团矿业有限公司 | A kind of iron ore composite ore point mill, sorting, magnetic-gravity separation technique |
| CN107385199A (en) * | 2017-07-11 | 2017-11-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of difficult ore dressing magnetizing roast dry grinding dry separation craft |
| CN107597430A (en) * | 2017-08-28 | 2018-01-19 | 鞍钢集团矿业有限公司 | A kind of magnetic reconnection for handling iron tailings closes ore-dressing technique |
| CN108405179A (en) * | 2018-03-07 | 2018-08-17 | 鞍钢集团矿业有限公司 | A kind of method of magnetic separation-roasting-magnetic separation process recycling magnetic tailing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105772216A (en) * | 2016-03-28 | 2016-07-20 | 东北大学 | Novel method for producing iron concentrates through complex refractory iron ore |
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| CN106362858A (en) * | 2016-10-14 | 2017-02-01 | 鞍钢集团矿业有限公司 | Process for extracting cement-replacing superfine iron tailing powder from iron tailings |
| CN107096638A (en) * | 2017-06-16 | 2017-08-29 | 鞍钢集团矿业有限公司 | A kind of iron ore composite ore point mill, sorting, magnetic-gravity separation technique |
| CN107385199A (en) * | 2017-07-11 | 2017-11-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of difficult ore dressing magnetizing roast dry grinding dry separation craft |
| CN107597430A (en) * | 2017-08-28 | 2018-01-19 | 鞍钢集团矿业有限公司 | A kind of magnetic reconnection for handling iron tailings closes ore-dressing technique |
| CN108405179A (en) * | 2018-03-07 | 2018-08-17 | 鞍钢集团矿业有限公司 | A kind of method of magnetic separation-roasting-magnetic separation process recycling magnetic tailing |
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