CN105233977A - Tailing recovery process adopting magnetic separation-circulating roasting-regrinding and magnetic separation method - Google Patents
Tailing recovery process adopting magnetic separation-circulating roasting-regrinding and magnetic separation method Download PDFInfo
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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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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a tailing recovery process adopting a magnetic separation-circulating roasting-regrinding and magnetic separation method. The tailing recovery process is characterized in that magnetic separation, third-section hydrocyclone closed circuit grinding and classification operation, circulating roasting, and regrinding and fifth-section low-intensity magnetic separation are adopted. According to the tailing recovery process disclosed by the invention, tailings in third-section low-intensity magnetic separation, fourth-section low-intensity magnetic separation and fifth-section low-intensity magnetic separation are returned to a concentration operation before roasting, and subjected to roasting, grinding and separation again, so that effective recovery for iron minerals is realized under relatively large grinding particle sizes, and the tailing grade is low, thus the good indexes of a concentrate grade of more than 63% and a metal recovery rate of more than 57% are obtained.
Description
Technical field
The invention belongs to iron ore beneficiation technical field, mine tailing technique is reclaimed in particularly a kind of preenrichment-circulation 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 magnetic separation-circulation 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 magnetic separation of the present invention-circulation 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, 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, two sections of cyclone overflows of more than granularity 80%-0.025mm feed one section of weak magnetic and sort, 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 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 heating-up temperature is 500 DEG C ~ 600 DEG C, and moisture content is reached after below 2%, passes into CO reducing gas and 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 the operation of three sections of cyclone closed circuit grinding classifications, the sand setting of three sections of cyclones feeds three sections of ore grindings, three sections of ore grindings adopt tower grinding machine, the ore discharge of tower mill returns three sections of cyclones and forms closed circuit grinding system, and granularity is that three sections of cyclone overflows of more than-0.025mm80% feed two sections of weak magnetic machines;
6) 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 63%, metal recovery rate more than 57%, one section of vertical-ring magnetic separator, grade 5% ~ 7% true tailings is merged in two sections of vertical-ring magnetic separator mine tailings and 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 deposit merging return two sections of two sections of concentrators and concentrate, suspension roasting and magnetic separation of regrinding form circulation roasting.
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 magnetic separation-circulation roasting-magnetic separation of regrinding, adopt three sections of weak magnetic, four sections of weak magnetic, the mine tailing of five sections of weak magnetic turns back to the concentrated operation before roasting, again carry out roasting, ore grinding, sort, can under the relatively thick grinding particle size of grinding particle size, obtain grade more than 63%, the concentrate of concentrate mineral products rate more than 10%, tailings grade less than 6%, the good index of metal recovery rate more than 57%, its rate of recovery comparatively traditional handicraft improves more than 30 percentage points, , simultaneously because one section of weak magnetic machine concentrate does not enter roasting operation, roasting operation treating capacity is made to reduce 15% ~ 40%, save energy consumption, reduce production cost.
Accompanying drawing explanation
Fig. 1 is the flow chart that mine tailing technique is reclaimed in magnetic separation of the present invention-circulation 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 magnetic separation of the present invention-circulation 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, 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, more than granularity 80%-0.025mm, this grinding particle size is industrially easy to realize relatively, and most of strongly magnetic mineral can be made under this granularity to be separated with weak magnetic mineral and gangue, therefore two sections of cyclone overflows feed one section of weak magnetic and sort, 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 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 heating-up temperature is 500 DEG C ~ 600 DEG C, and moisture content is reached after below 2%, passes into CO reducing gas and 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 the operation of three sections of cyclone closed circuit grinding classifications, the sand setting of three sections of cyclones feeds three sections of ore grindings, three sections of ore grindings adopt tower grinding machine, the ore discharge of tower mill returns three sections of cyclones and forms closed circuit grinding system, more than grinding particle size-0.025mm80%, this grinding particle size is industrially easy to realize relatively, and most of strongly magnetic mineral can be made under this granularity to be separated with weak magnetic mineral and gangue, therefore three sections of cyclone overflows feed two sections of weak magnetic machines;
6) 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 63%, metal recovery rate more than 57%, one section of vertical-ring magnetic separator, grade 5% ~ 7% true tailings is merged in two sections of vertical-ring magnetic separator mine tailings and two sections of weak magnetic tail ore deposits, three sections of weak magnetic tail ore deposits, the intergrowth of part strongly magnetic mineral and weak magnetic mineral and gangue is had in four sections of weak magnetic tail ore deposits and five sections of weak magnetic tail ore deposits, again through roasting, ore grinding, weak choosing can be reclaimed further to it, therefore three sections of weak magnetic tail ore deposits, four sections of weak magnetic tail ore deposits and five sections of weak magnetic tail ore deposit merging return two sections of two sections of concentrators and concentrate, suspension roasting and magnetic separation of regrinding form circulation roasting.
The present invention's five sections of magnetic machines adopt magnetovibration highly-effective magnetic separator, the feature of this equipment is: sort in district and have 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 gathering magnetic, dodging and shake, gangue is fully separated with iron mineral, realizes the effective recovery to superfine rank iron mineral.
The mine tailing of three sections of weak magnetic of this technique, four sections of weak magnetic, five sections of weak magnetic turns back to the concentrated operation before roasting, again carry out roasting, ore grinding, sort, can under the relatively thick grinding particle size of grinding particle size, realize the effective recovery to iron mineral, tailings grade is lower.
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 magnetic separation-circulation 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, 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, two sections of cyclone overflows of more than granularity 80%-0.025mm feed one section of weak magnetic and sort, 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 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 heating-up temperature is 500 DEG C ~ 600 DEG C, and moisture content is reached after below 2%, passes into CO reducing gas and 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 the operation of three sections of cyclone closed circuit grinding classifications, the sand setting of three sections of cyclones feeds three sections of ore grindings, three sections of ore grindings adopt tower grinding machine, the ore discharge of tower mill returns three sections of cyclones and forms closed circuit grinding system, and granularity is that three sections of cyclone overflows of more than-0.025mm80% feed two sections of weak magnetic machines;
6) 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 63%, metal recovery rate more than 57%, one section of vertical-ring magnetic separator, grade 5% ~ 7% true tailings is merged in two sections of vertical-ring magnetic separator mine tailings and 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 deposit merging return two sections of two sections of concentrators and concentrate, suspension roasting and magnetic separation of regrinding form circulation roasting.
2. mine tailing technique is reclaimed in magnetic separation according to claim 1-circulation roasting-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 magnetic separation according to claim 1-circulation roasting-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 magnetic separation according to claim 1-circulation roasting-magnetic separation of regrinding, and it is characterized in that five sections of described weak magnetic machines adopt magnetovibration highly-effective magnetic separator.
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Cited By (5)
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| CN105855020A (en) * | 2016-05-27 | 2016-08-17 | 鞍钢集团矿业公司 | High-pressure roller milling-dry preliminary election technology for lean magnetite ore |
| CN107365904A (en) * | 2017-07-11 | 2017-11-21 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore shaft roasting magnetic separation flotation tailing recycles technique |
| CN107546435A (en) * | 2017-07-17 | 2018-01-05 | 中航锂电（洛阳）有限公司 | A kind of physical purification method of lithium ion battery recovery positive mix |
| CN108480036A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of pre-selection-roasting-magnetic heavy industry skill recycling magnetic tailing |
| CN108672071A (en) * | 2018-05-07 | 2018-10-19 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of artificial magnet plants processing and speculum iron is mixed into artificial magnet and plants magnetization sorting process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107365904B (en) * | 2017-07-11 | 2019-01-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore shaft roasting magnetic separation flotation tailing recycling technique |
| CN107546435A (en) * | 2017-07-17 | 2018-01-05 | 中航锂电（洛阳）有限公司 | A kind of physical purification method of lithium ion battery recovery positive mix |
| CN108480036A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of pre-selection-roasting-magnetic heavy industry skill recycling magnetic tailing |
| CN108672071A (en) * | 2018-05-07 | 2018-10-19 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of artificial magnet plants processing and speculum iron is mixed into artificial magnet and plants magnetization sorting process |
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