CN104923386A - Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process - Google Patents
Micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process Download PDFInfo
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- CN104923386A CN104923386A CN201510320314.4A CN201510320314A CN104923386A CN 104923386 A CN104923386 A CN 104923386A CN 201510320314 A CN201510320314 A CN 201510320314A CN 104923386 A CN104923386 A CN 104923386A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract
The invention relates to a micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process. The micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process is characterized by separating micro-fine disseminated mixed ores through an operating system with semi-autogenous grinding, wet preconcentration, continuous ore grinding, low-intensity and high-intensity magnetic separation, under-size sieve grinding and high-intensity magnetic fine gravitational separation to obtain 65.5-66% of iron ore concentrate at a yield rate of 35-40%. The micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process has the advantages that, by means of a wet semi-autogenous grinding process, crushing operations can be reduced; preconcentrated rough concentrate, after two sections of continuous grinding, can get rid of large-grain gangue and lean locked particles; then by performing separation through a low-intensity magnetic fine sieve regrinding method, qualified-grade concentrate can be obtained and meanwhile feeding capacity of gravitational separation operations can be reduced by 30%. Meanwhile, the micro-fine disseminated mixed ore coarse size preconcentrating and magnetic-gravitational separating process is short in process, simple in equipment, easy to operate, free from environmental pollution and capable of saving energy.
Description
Technical field
The invention belongs to iron ore beneficiation technical field, particularly a kind of
the preliminary election of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process.
Background technology
In recent years, domestic sorting for poor iron ore is successfully employed " Continuous Grinding, weak magnetic-strong magnetic-cloudy reverse flotation ", " stage grinding, weak magnetic-strong magnetic-anion reverse floatation ", " stage grinding, thickness grading; middling ore regrinding; weight-magnetic-reverse flotation ", " Continuous Grinding; thickness grading, middling ore regrinding, weight-magnetic-reverse flotation ", " three sections of ore grindings; stage weak magnetic strength magnetic-reverse flotation " technique, selects factory to apply respectively at Anshan iron and steel plant and domestic other.
What this several flow process adopted is raw ore after three sections of crushing and screenings, and under sieve ,-12 millimeters of product introduction grinding operations, sort after being milled to required grinding particle size, obtains the concentrate of acceptable quality." Continuous Grinding, weak magnetic-strong magnetic-cloudy reverse flotation ", " stage grinding, weak magnetic-strong magnetic-anion reverse floatation ", " three sections of ore grindings, stage weak magnetic strength magnetic-reverse flotation " technological process
in,flotation concentrate is final concentrate; " stage grinding, thickness grading, middling ore regrinding, weight-magnetic-reverse flotation ", " Continuous Grinding, thickness grading, middling ore regrinding, weight-magnetic-reverse flotation " technological process
in, gravity concentrate and flotation concentrate are combined into final concentrate.
Along with the deep exploitation of Mineral Resources in China, most of mine will enter the deep mining stage, will occur the ecotone of magnetic iron ore and bloodstone, and what ore dressing faced is sorting of magnetic-red composite ore, and wherein the ratio of magnetic iron ore and bloodstone is at about 4:6.
Such as: " three sections of ore grindings, stage weak magnetic-strong magnetic-reverse flotation " technological process that fine-grained disseminated grain iron ore adopts usually sorts, and Beneficiation flowsheet is shown in Fig. 1.
Conventional ore adopts coarse broken, the broken, thin broken-screening three sections of crushing process flow processs usually, ore grain size reaches below-12mm, again through two sections of Continuous Grindings, granularity reaches-200 order content more than 80%, after one section of weak magnetic strength magnetic separation, will mix magnetic concentrate regrinding, granularity reaches-325 order content 85% ~ 90%, again after the weak magnetic strength magnetic separation of second segment, secondary mixes magnetic concentrate and feeds reverse flotation work, reverse flotation work be one section roughly select, one section selected, three sections scan closed circuit floatation process.
In this technique, after one section of mixed magnetic concentrate regrinding, granularity reaches-325 orders 85% ~ 90%, a certain amount of magnetic ore deposit is had fully to reach monomer dissociation in this grinding particle size product, qualified grade magnetic concentrate can be obtained through magnetic separation, but the magnetic iron ore that part contained in ore in flow process has reached monomer dissociation enters in reverse flotation work, make flotation operation Chinese medicine consumption large, namely the treating capacity of flotation operation is added, turn increase floating agent dosage and beneficiation cost, causing appearance part not have the particulate magnetic ore deposit of abundant mineralising to enter in flotation operation mine tailing causes tailings grade higher, the drawbacks such as metal loss is larger.
Summary of the invention
The object of this invention is to provide
the preliminary election of a kind of fine grain teeth cloth composite ore coarse grain, magnetic-weight grder manskill, adopt wet type Semi-autogenous Grinding Technology, decrease crushing operation, preliminary election rough concentrate after two sections of Continuous Grindings, the large grain gangue of jettisoning and lean intergrowth, then sort through weak magnetic-spun yarn evenness method, like this while the qualified grade concentrate of acquisition, reselection operation mine-supplying quantity can be made to reduce about 30%, and technological process is short, equipment is simple, easy to operate, free from environmental pollution, energy-saving and cost-reducing.
The object of the invention is to be realized by following technical proposals:
Of the present invention
the preliminary election of a kind of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process,it is characterized in that adopting " Semi-Autogenous, wet type pre-selecting, Continuous Grinding, weak magnetic-strong magnetic, spun yarn evenness, the gravity treatment of strong magnetic essence " operating system, concrete steps are as follows:
A) be 31% ~ 33% by grade, Armco magnetic iron content is 40 ~ 60%, granularity is the raw ore of below 300mm, after Semi-Autogenous, the product that granularity reaches below-3mm enters to wet type pre-selecting, described wet type pre-selecting adopts the weak magnetic preliminary election of wet type and wet high-intensity magnetic preliminary election, the large grain gangue of jettisoning productive rate 15% ~ 20% and lean intergrowth;
B) mine tailing of the weak magnetic preliminary election of wet type feeds wet high-intensity magnetic preliminary election, and wet high-intensity magnetic preliminary rejection is as mine tailing jettisoning; The pre-concentrate selection of the weak magnetic of wet type and the pre-concentrate selection of wet high-intensity magnetic are merged into wet type pre-selecting and are mixed magnetic concentrate and feed two sections of Continuous Grinding operations;
C) two sections of Continuous Grinding operations described in adopt the operation of twice classifying cyclone closed circuit grinding, namely preliminary election mixes magnetic concentrate and feeds the operation of scalping cyclone closed circuit grinding, scalping hydrocyclone sand feeds one section of ball mill, and one section of ball mill ore discharging returns scalping cyclone classification; The overflow of scalping cyclone feeds the operation of secondary grading cyclone closed circuit grinding, secondary grading hydrocyclone sand feeds two sections of ball mills, two sections of ball milling ore discharge products return secondary grading cyclone classification, and secondary grading cyclone overflow granularity reaches-320 orders 90 ~ 95%;
D) overflow of secondary grading cyclone feeds one section of weak magnetic operation, one section of inferior fine magnetite concentrate feeds two sections of weak magnetic operations, two sections of inferior fine magnetite concentrates feed dusting cover, dusting cover oversize returns secondary grading cyclone classification, dusting cover undersize is the magnetic concentrate selected in advance, its grade is 65% ~ 66%, productive rate is 15% ~ 20%, before one section of weakly magnetic tailings and two sections of weakly magnetic tailingses merging feed strong magnetic, large well concentrates, underflow product after concentrated feeds one section strong magnetic operation, overflow after concentrated feeds recirculated water, the concentrate of one section of high intensity magnetic separation operation feeds reselection operation, the mine tailing of one section strong magnetic operation is as mine tailing jettisoning,
E) reselection operation described in adopts one section to roughly select centrifuge, one section of selected centrifuge, one section of closed-circuit system of scanning centrifuge and being formed, one section of concentrate roughly selecting centrifuge feeds one section of selected centrifuge, one section of mine tailing roughly selecting centrifuge feeds one section and scans centrifuge, concentrate and the dusting cover undersize of one section of selected centrifuge are combined into final concentrate, grade is 65.5% ~ 66%, productive rate is 35%-40%, the mine tailing of one section of selected centrifuge returns one section and roughly selects centrifuge, one section of concentrate scanning centrifuge returns one section and roughly selects centrifuge, one section of mine tailing and wet high-intensity magnetic preliminary rejection scanning centrifuge, one section of high intensity magnetic separation mine tailing is combined into true tailings, grade is 13% ~ 14%, productive rate is 66% ~ 60%.
Advantage of the present invention is: fine grain teeth cloth composite ore through wet type Semi-Autogenous-screening after, undersize is through wet type pre-selecting, spun yarn evenness, magnetic-weight sorting process sorts, wet type pre-selecting can make ore under coarse fraction condition, dish out 15% ~ 20% bulky grain qualified tailings, magnetic separation-Fine screening-regrinding technology, can the pre-dressing rate of output 15 ~ 20%, grade more than 65% magnetic ore deposit, reduce gravity treatment centrifuge operation mine-supplying quantity, compared with reverse flotation, decrease the link of making up a prescription of flotation, decrease environmental pollution, avoid the easy wave phenomenon of flotation operation, and adopt centrifuge technology process flow process short, equipment is simple, easy to operate, free from environmental pollution, energy-saving and cost-reducing.
Accompanying drawing explanation
Fig. 1 is former three sections of ore grindings, stage weak magnetic, Qiang Ci, anion reverse floatation process chart.
Fig. 2 is process chart of the present invention.
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 2, of the present invention
the preliminary election of a kind of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process,it is characterized in that adopting " Semi-Autogenous, wet type pre-selecting, Continuous Grinding, weak magnetic-strong magnetic, spun yarn evenness, strong magnetic essence-gravity treatment " operating system, concrete steps are as follows:
A) be 31% ~ 33% by grade, Armco magnetic iron content is 40 ~ 60%, granularity is the raw ore of below 300mm, after Semi-Autogenous, the product that granularity reaches below-3mm enters to wet type pre-selecting, described wet type pre-selecting adopts the weak magnetic preliminary election of wet type and wet high-intensity magnetic preliminary election, the large grain gangue of jettisoning productive rate 15% ~ 20% and lean intergrowth;
B) mine tailing of the weak magnetic preliminary election of wet type feeds wet high-intensity magnetic preliminary election, and wet high-intensity magnetic preliminary rejection is as mine tailing jettisoning; The pre-concentrate selection of the weak magnetic of wet type and the pre-concentrate selection of wet high-intensity magnetic are merged into wet type pre-selecting and are mixed magnetic concentrate and feed two sections of Continuous Grinding operations;
C) two sections of Continuous Grinding operations described in adopt the operation of twice classifying cyclone closed circuit grinding, namely preliminary election mixes magnetic concentrate and feeds the operation of scalping cyclone closed circuit grinding, scalping hydrocyclone sand feeds one section of ball mill, and one section of ball mill ore discharging returns scalping cyclone classification; The overflow of scalping cyclone feeds the operation of secondary grading cyclone closed circuit grinding, secondary grading hydrocyclone sand feeds two sections of ball mills, two sections of ball milling ore discharge products return secondary grading cyclone classification, and secondary grading cyclone overflow granularity reaches-320 orders 90 ~ 95%;
D) overflow of secondary grading cyclone feeds one section of weak magnetic operation, one section of inferior fine magnetite concentrate feeds two sections of weak magnetic operations, two sections of inferior fine magnetite concentrates feed dusting cover, dusting cover oversize returns secondary grading cyclone classification, dusting cover undersize is the magnetic concentrate selected in advance, its grade is 65% ~ 66%, productive rate is 15% ~ 20%, before one section of weakly magnetic tailings and two sections of weakly magnetic tailingses merging feed strong magnetic, large well concentrates, underflow product after concentrated feeds one section strong magnetic operation, overflow after concentrated feeds recirculated water, the concentrate of one section of high intensity magnetic separation operation feeds reselection operation, the mine tailing of one section strong magnetic operation is as mine tailing jettisoning,
E) reselection operation described in adopts one section to roughly select centrifuge, one section of selected centrifuge, one section of closed-circuit system of scanning centrifuge and being formed, one section of concentrate roughly selecting centrifuge feeds one section of selected centrifuge, one section of mine tailing roughly selecting centrifuge feeds one section and scans centrifuge, concentrate and the dusting cover undersize of one section of selected centrifuge are combined into final concentrate, grade is 65.5% ~ 66%, productive rate is 35%-40%, the mine tailing of one section of selected centrifuge returns one section and roughly selects centrifuge, one section of concentrate scanning centrifuge returns one section and roughly selects centrifuge, one section of mine tailing and wet high-intensity magnetic preliminary rejection scanning centrifuge, one section of high intensity magnetic separation mine tailing is combined into true tailings, grade is 13% ~ 14%, productive rate is 65% ~ 60%.
Advantage of the present invention is: fine grain teeth cloth composite ore through wet type Semi-Autogenous-screening after, undersize is through preliminary election, spun yarn evenness, magnetic-weight sorting process sorts, wet type pre-selecting can make ore under coarse fraction condition, dish out 15% ~ 20% bulky grain qualified tailings, magnetic-heavily sorting, can the pre-dressing rate of output 15 ~ 20%, grade more than 65% magnetic ore deposit, reduce reselection operation mine-supplying quantity, compared with reverse flotation, decrease the link of making up a prescription of flotation, decrease environmental pollution, avoid the easy wave phenomenon of flotation operation, and adopt centrifuge technology process flow process short, equipment is simple, easy to operate, free from environmental pollution, energy-saving and cost-reducing.
Claims (1)
1. one kind
the preliminary election of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process, itsbe characterised in that employing is Semi-Autogenous, wet type pre-selecting, Continuous Grinding, spun yarn evenness, magnetic-heavily separation operation system, concrete steps are as follows:
A) be 31% ~ 33% by grade, Armco magnetic iron content is 40 ~ 60%, granularity is that the raw ore of below 300mm is after Semi-Autogenous, the product that granularity reaches below-3mm enters to wet type pre-selecting, described wet type pre-selecting adopts the weak magnetic preliminary election of wet type and wet high-intensity magnetic preliminary election, the large grain gangue of jettisoning productive rate 15% ~ 20% and lean intergrowth;
B) mine tailing of the weak magnetic preliminary election of wet type feeds wet high-intensity magnetic preliminary election, and wet high-intensity magnetic preliminary rejection is as mine tailing jettisoning; The pre-concentrate selection of the weak magnetic of wet type and the pre-concentrate selection of wet high-intensity magnetic are merged into wet type pre-selecting and are mixed magnetic concentrate and feed two sections of Continuous Grinding operations;
C) two sections of Continuous Grinding operations described in adopt the operation of twice classifying cyclone closed circuit grinding, namely preliminary election mixes magnetic concentrate and feeds the operation of scalping cyclone closed circuit grinding, scalping hydrocyclone sand feeds one section of ball mill, and one section of ball mill ore discharging returns scalping cyclone classification; The overflow of scalping cyclone feeds the operation of secondary grading cyclone closed circuit grinding, secondary grading hydrocyclone sand feeds two sections of ball mills, two sections of ball milling ore discharge products return secondary grading cyclone classification, and secondary grading cyclone overflow granularity reaches-320 orders 90 ~ 95%;
D) overflow of secondary grading cyclone feeds one section of weak magnetic operation, one section of inferior fine magnetite concentrate feeds two sections of weak magnetic operations, two sections of inferior fine magnetite concentrates feed dusting cover, dusting cover oversize returns secondary grading cyclone classification, dusting cover undersize is the magnetic concentrate selected in advance, its grade is 65% ~ 66%, productive rate is 15% ~ 20%, before one section of weakly magnetic tailings and two sections of weakly magnetic tailingses merging feed strong magnetic, large well concentrates, underflow product after concentrated feeds one section strong magnetic operation, overflow after concentrated feeds recirculated water, the concentrate of one section of high intensity magnetic separation operation feeds reselection operation, the mine tailing of one section strong magnetic operation is as mine tailing jettisoning,
E) reselection operation described in adopts one section to roughly select centrifuge, one section of selected centrifuge, one section of closed-circuit system of scanning centrifuge and being formed, one section of concentrate roughly selecting centrifuge feeds one section of selected centrifuge, one section of mine tailing roughly selecting centrifuge feeds one section and scans centrifuge, concentrate and the dusting cover undersize of one section of selected centrifuge are combined into final concentrate, grade is 65.5% ~ 66%, productive rate is 35%-40%, the mine tailing of one section of selected centrifuge returns one section and roughly selects centrifuge, one section of concentrate scanning centrifuge returns one section and roughly selects centrifuge, one section of mine tailing and wet high-intensity magnetic preliminary rejection scanning centrifuge, one section of high intensity magnetic separation mine tailing is combined into true tailings, grade is 13% ~ 14%, productive rate is 65% ~ 60%.
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| CN106423533A (en) * | 2016-10-14 | 2017-02-22 | 鞍钢集团矿业有限公司 | Poor hematite high-pressure roller grinding, roughness and fineness classification and reselection-magnetic separation-reverse flotation technology |
| CN106423534A (en) * | 2016-10-14 | 2017-02-22 | 鞍钢集团矿业有限公司 | Poor hematite high pressure roller milling, thickness grading and reselection-magnetic separation-centrifugal machine sorting process |
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| CN106269204B (en) * | 2016-08-17 | 2018-07-27 | 鞍钢集团矿业有限公司 | A kind of energy saving technique of processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
| CN106269204A (en) * | 2016-08-17 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of energy saving technique processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
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| 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 |
| CN108283988B (en) * | 2018-02-09 | 2020-03-31 | 鞍钢集团矿业设计研究院有限公司 | Process for treating mixed iron ore by stage ore grinding magnetic-gravity flow |
| CN108283988A (en) * | 2018-02-09 | 2018-07-17 | 鞍钢集团矿业设计研究院有限公司 | Stage grinding magnetic weight flow processing mixed type iron ore technique |
| CN108355828A (en) * | 2018-02-09 | 2018-08-03 | 鞍钢集团矿业设计研究院有限公司 | The full permanent magnetism short route of Continuous Grinding handles mixed type iron ore technique |
| CN108355827A (en) * | 2018-02-09 | 2018-08-03 | 鞍钢集团矿业设计研究院有限公司 | Continuous Grinding magnetic weight flow processing mixed type iron ore technique |
| CN108480034A (en) * | 2018-03-07 | 2018-09-04 | 鞍钢集团矿业有限公司 | A kind of method of magnetic-weight combined mineral dressing technology recycling magnetic tailing |
| 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 |
| CN109013068A (en) * | 2018-08-01 | 2018-12-18 | 中冶北方（大连）工程技术有限公司 | A kind of upgrading drop general labourer's skill of copper mine |
| CN109013068B (en) * | 2018-08-01 | 2020-07-28 | 中冶北方（大连）工程技术有限公司 | Quality-improving and impurity-reducing process for copper ore |
| CN109351467B (en) * | 2018-09-20 | 2020-07-28 | 鞍钢集团矿业有限公司 | Sorting process for treating maghemia mixed ore based on iron mineral embedded granularity |
| CN109351467A (en) * | 2018-09-20 | 2019-02-19 | 鞍钢集团矿业有限公司 | A kind of sorting process based on the iron mineral disseminated grain size processing red mixed ore of magnetic |
| CN110302896A (en) * | 2018-11-06 | 2019-10-08 | 无锡多瑞玛科技有限公司 | A kind of two product heavy-medium cyclone process for discarding tailings |
| CN109663653A (en) * | 2018-11-16 | 2019-04-23 | 西北矿冶研究院 | Process method for recycling copper by grading and regrinding copper-selecting tailings |
| CN109759248A (en) * | 2019-02-28 | 2019-05-17 | 玉溪大红山矿业有限公司 | A kind of underground low-grade iron ore magnetic reconnection closes the ore-dressing technique of upgrading drop tail |
| CN109759248B (en) * | 2019-02-28 | 2021-06-01 | 玉溪大红山矿业有限公司 | Magnetic-gravity combined upgrading and tailing-reducing mineral separation process for underground low-grade iron ore |
| CN109894267A (en) * | 2019-03-20 | 2019-06-18 | 中钢集团马鞍山矿山研究院有限公司 | The magnetic of the red compound iron ore of magnetic-- weight method for separating |
| CN113769885A (en) * | 2021-04-26 | 2021-12-10 | 安徽金日晟矿业有限责任公司 | Mineral processing technology for realizing balanced and efficient recovery of mixed iron ore mining |
| CN113769885B (en) * | 2021-04-26 | 2022-12-16 | 安徽金日晟矿业有限责任公司 | Mineral processing technology for realizing balanced and efficient recovery of mixed iron ore mining |
| WO2023060890A1 (en) * | 2021-10-14 | 2023-04-20 | 中钢集团马鞍山矿山研究总院股份有限公司 | Beneficiation method for stepped recovery and segmented tailing discarding of low-grade chromite ore |
| CN115445759A (en) * | 2022-09-13 | 2022-12-09 | 鞍钢集团矿业设计研究院有限公司 | Combined process of grinding, selecting and gravity-magnetic separation of magnetic hematite mixed ore |
| CN115921093A (en) * | 2022-12-20 | 2023-04-07 | 鞍钢集团矿业有限公司 | Separate grinding-magnetic levitation combined separation process for maghemite |
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