CN104923386B - The pre-selection of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process - Google Patents
The pre-selection of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process Download PDFInfo
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- CN104923386B CN104923386B CN201510320314.4A CN201510320314A CN104923386B CN 104923386 B CN104923386 B CN 104923386B CN 201510320314 A CN201510320314 A CN 201510320314A CN 104923386 B CN104923386 B CN 104923386B
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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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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Abstract
The present invention relates to a kind of pre-selection of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process, it is characterized in that using Semi-Autogenous, wet type pre-selecting, Continuous Grinding, the strong magnetic of weak magnetic, spun yarn evenness, strong magnetic essence gravity treatment " operating system; sorted to fine grain teeth cloth composite ore, obtains 65.5%~66%, and yield is 35% 40% iron ore concentrate.It is an advantage of the invention that：Using wet type Semi-autogenous Grinding Technology, reduce crushing operation, pre-selection rough concentrate is after two sections of Continuous Grindings, the big grain gangue of jettisoning and lean intergrowth, sorted through weak magnetic spun yarn evenness method again, so while qualified grade concentrate is obtained, reselection operation mine-supplying quantity can be made to reduce 30% or so, it is energy-saving and technological process is short, equipment is simple, easy to operate, free from environmental pollution.
Description
Technical field
The invention belongs to iron ore beneficiation technical field, particularly a kind of fine grain teeth cloth composite ore coarse grain pre-selection, magnetic-weight
Sorting process.
Background technology
In recent years, it is domestic sorted for poor iron ore be successfully employed " Continuous Grinding, weak magnetic-strong magnetic-the moon reverse flotation ",
" stage grinding, weak magnetic-strong magnetic-anion reverse floatation ", " stage grinding, thickness grading, middling ore regrinding, weight-magnetic-anti-floating
Choosing ", " Continuous Grinding, thickness grading, middling ore regrinding, weight-magnetic-reverse flotation ", " three sections of ore grindings, the strong magnetic of stage weak magnetic-anti-floating
Choosing " technique, respectively Anshan iron and steel plant and it is domestic other select factory's popularization and application.
After what this several flow was used is raw ore through three sections of crushing and screenings, -12 millimeters of products enter grinding operation under sieve,
Sorted after grinding particle size required for being milled to, obtained the concentrate of acceptable quality." Continuous Grinding, weak magnetic-strong magnetic-the moon
Reverse flotation ", " stage grinding, weak magnetic-strong magnetic-anion reverse floatation ", " three sections of ore grindings, the strong magnetic-reverse flotation of stage weak magnetic " work
In skill flow, flotation concentrate is final concentrate；It is " stage grinding, thickness grading, middling ore regrinding, weight-magnetic-reverse flotation ", " continuous
In ore grinding, thickness grading, middling ore regrinding, weight-magnetic-reverse flotation " technological process, gravity concentrate and flotation concentrate are combined into final essence
Ore deposit.
With deeply developing for Mineral Resources in China, most of mine will will appear from magnetic iron ore into the deep mining stage
With the ecotone of bloodstone, what ore dressing faced is sorting for magnetic-red composite ore, and wherein the ratio of magnetic iron ore and bloodstone is 4：6
Left and right.
For example：" three sections of ore grindings, stage weak magnetic-strong magnetic-reverse flotation " technological process that fine-grained disseminated grain iron ore is generally used
Sort, Beneficiation flowsheet is shown in Fig. 1.
Conventional ore generally uses three sections of crushing process flows of coarse broken, the broken, thin broken-screening, and ore grain size reaches-
Below 12mm, then through two sections of Continuous Grindings, granularity reaches -200 mesh contents more than 80%, by that after one section of weak magnetic high intensity magnetic separation, will mix
Magnetic concentrate regrinding, granularity reaches -325 mesh contents 85%~90%, then by after second segment weak magnetic high intensity magnetic separation, secondary mixed magnetic concentrate is given
Enter reverse flotation work, reverse flotation work be one section of roughing, one section it is selected, three sections scan closed circuit floatation process.
Granularity reaches -325 mesh 85%~90% after one section of mixed magnetic concentrate regrinding in the technique, has one in the grinding particle size product
Quantitative magnetic ore deposit has sufficiently achieved monomer dissociation, and qualified grade magnetic concentrate can be obtained by magnetic separation, but in flow in ore
The magnetic iron ore that contained part has reached monomer dissociation enters in reverse flotation work so that flotation operation Chinese medicine consumption is big, i.e.,
The treating capacity of flotation operation is increased, floating agent dosage and beneficiation cost are increased again, cause part occur without abundant ore deposit
The particulate magnetic ore deposit of change is into causing the drawbacks such as tailings grade is higher, metal loss is larger in flotation operation mine tailing.
The content of the invention
It is an object of the invention to provide a kind of pre-selection of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process, using wet
Formula Semi-autogenous Grinding Technology, reduces crushing operation, pre-selection rough concentrate after two sections of Continuous Grindings, the big grain gangue of jettisoning and poor adhesion
Body, then sorted through weak magnetic-spun yarn evenness method, so while qualified grade concentrate is obtained, reselection operation mine-supplying quantity can be made
30% or so is reduced, and technological process is short, equipment is simple, easy to operate, free from environmental pollution, it is energy-saving.
The purpose of the present invention is realized by following technical proposals：
A kind of fine grain teeth cloth composite ore coarse grain pre-selection of the invention, magnetic-weight sorting process, it is characterised in that using " half
Autogenous grinding, wet type pre-selecting, Continuous Grinding, weak magnetic-strong magnetic, spun yarn evenness, the gravity treatment of strong magnetic essence " operating system, comprises the following steps that：
A) it is 31%~33% by grade, magnetic iron content is 40~60%, granularity is the raw ore of below 300mm, through half certainly
After mill, the product that granularity is reached below -3mm enters to wet type pre-selecting, and described wet type pre-selecting is preselected and wet type using wet type weak magnetic
High magnetic pre-selection, the big grain gangue and lean intergrowth of jettisoning yield 15%~20%；
B) mine tailing of wet type weak magnetic pre-selection feeds wet high-intensity magnetic pre-selection, and wet high-intensity magnetic preliminary rejection is used as mine tailing jettisoning；It is wet
The pre- concentrate selection of formula weak magnetic and the pre- concentrate selection of wet high-intensity magnetic merge into the mixed magnetic concentrate of wet type pre-selecting and feed two sections of Continuous Grinding operations；
C) two sections of Continuous Grinding operations described in use classifying cyclone closed circuit grinding operation twice, that is, preselect mixed magnetic essence
Ore deposit feeds scalping cyclone closed circuit grinding operation, and scalping hydrocyclone sand feeds one section of ball mill, one section of ball mill
Ore discharge returns to scalping cyclone classification；Scalping cyclone overflow feeds secondary grading cyclone closed circuit grinding operation,
Secondary grading hydrocyclone sand feeds two sections of ball mills, and two sections of ball milling ore discharge products return to secondary grading cyclone classification, secondary
Classifying cyclone overflow granularity reaches -320 mesh 90 ~ 95%；
D) secondary grading cyclone overflow feeds one section of weak magnetic operation, and one section of inferior fine magnetite concentrate feeds two sections of weak magnetic operations, two
Section inferior fine magnetite concentrate feeds dusting cover, and dusting cover oversize returns to secondary grading cyclone classification, and dusting cover undersize is to select in advance
Magnetic concentrate, its grade is 65% ~ 66%, and yield is 15% ~ 20%, one section of weakly magnetic tailings and two sections of weakly magnetic tailingses merge feed it is strong
Big well is concentrated before magnetic, and the underflow product after concentration feeds one section strong magnetic operation, and the overflow after concentration feeds recirculated water, one section
The concentrate of high intensity magnetic separation operation feeds reselection operation, and the one section strong mine tailing of magnetic operation is used as mine tailing jettisoning；
E) reselection operation described in uses one section of roughing centrifuge, one section of selected centrifuge, scans centrifuge for one section and is formed
Closed-circuit system, the concentrate of one section of roughing centrifuge feeds one section of selected centrifuge, and the mine tailing of one section of roughing centrifuge feeds one
Section scans centrifuge, and one section of concentrate of selected centrifuge is combined into final concentrate with dusting cover undersize, and grade is 65.5%~66%,
Yield is 35%-40%, and one section of mine tailing of selected centrifuge returns to one section of roughing centrifuge, and one section of concentrate for scanning centrifuge is returned
One section of roughing centrifuge, one section of mine tailing for scanning centrifuge is combined into finally with wet high-intensity magnetic preliminary rejection, one section of high intensity magnetic separation mine tailing
Mine tailing, grade is 13%~14%, and yield is 66%~60%.
It is an advantage of the invention that：Fine grain teeth cloth composite ore through wet type it is Semi-Autogenous-screening after, undersize is pre- through wet type
Choosing, spun yarn evenness, magnetic-weight sorting process sorts, and wet type pre-selecting can make ore under the conditions of coarse fraction, dish out 15% ~ 20% it is big
Particle qualified tailings, magnetic separation-Fine screening-regrinding technology can the pre-dressing rate of output 15 ~ 20%, the magnetic ore deposit of grade more than 65%, reduction
Gravity treatment centrifugation machine operation mine-supplying quantity, compared with reverse flotation, reduces the link made up a prescription of flotation, reduces environmental pollution, keeps away
Exempt from the easy wave phenomenon of flotation operation, and use centrifuge technology process flow is short, equipment is simple, easy to operate, free from environmental pollution,
It is energy-saving.
Brief description of the drawings
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 invention.
Specific embodiment
Specific embodiment of the invention is further illustrated below in conjunction with the accompanying drawings.
As shown in Fig. 2 a kind of fine grain teeth cloth composite ore coarse grain pre-selection of the invention, magnetic-weight sorting process, its feature
It is using " Semi-Autogenous, wet type pre-selecting, Continuous Grinding, weak magnetic-strong magnetic, spun yarn evenness, strong magnetic essence-gravity treatment " operating system, tool
Body step is as follows：
A) it is 31%~33% by grade, magnetic iron content is 40~60%, granularity is the raw ore of below 300mm, through half certainly
After mill, the product that granularity is reached below -3mm enters to wet type pre-selecting, and described wet type pre-selecting is preselected and wet type using wet type weak magnetic
High magnetic pre-selection, the big grain gangue and lean intergrowth of jettisoning yield 15%~20%；
B) mine tailing of wet type weak magnetic pre-selection feeds wet high-intensity magnetic pre-selection, and wet high-intensity magnetic preliminary rejection is used as mine tailing jettisoning；It is wet
The pre- concentrate selection of formula weak magnetic and the pre- concentrate selection of wet high-intensity magnetic merge into the mixed magnetic concentrate of wet type pre-selecting and feed two sections of Continuous Grinding operations；
C) two sections of Continuous Grinding operations described in use classifying cyclone closed circuit grinding operation twice, that is, preselect mixed magnetic essence
Ore deposit feeds scalping cyclone closed circuit grinding operation, and scalping hydrocyclone sand feeds one section of ball mill, one section of ball mill
Ore discharge returns to scalping cyclone classification；Scalping cyclone overflow feeds secondary grading cyclone closed circuit grinding operation,
Secondary grading hydrocyclone sand feeds two sections of ball mills, and two sections of ball milling ore discharge products return to secondary grading cyclone classification, secondary
Classifying cyclone overflow granularity reaches -320 mesh 90 ~ 95%；
D) secondary grading cyclone overflow feeds one section of weak magnetic operation, and one section of inferior fine magnetite concentrate feeds two sections of weak magnetic operations, two
Section inferior fine magnetite concentrate feeds dusting cover, and dusting cover oversize returns to secondary grading cyclone classification, and dusting cover undersize is to select in advance
Magnetic concentrate, its grade is 65% ~ 66%, and yield is 15% ~ 20%, one section of weakly magnetic tailings and two sections of weakly magnetic tailingses merge feed it is strong
Big well is concentrated before magnetic, and the underflow product after concentration feeds one section strong magnetic operation, and the overflow after concentration feeds recirculated water, one section
The concentrate of high intensity magnetic separation operation feeds reselection operation, and the one section strong mine tailing of magnetic operation is used as mine tailing jettisoning；
E) reselection operation described in uses one section of roughing centrifuge, one section of selected centrifuge, scans centrifuge for one section and is formed
Closed-circuit system, the concentrate of one section of roughing centrifuge feeds one section of selected centrifuge, and the mine tailing of one section of roughing centrifuge feeds one
Section scans centrifuge, and one section of concentrate of selected centrifuge is combined into final concentrate with dusting cover undersize, and grade is 65.5%~66%,
Yield is 35%-40%, and one section of mine tailing of selected centrifuge returns to one section of roughing centrifuge, and one section of concentrate for scanning centrifuge is returned
One section of roughing centrifuge, one section of mine tailing for scanning centrifuge is combined into finally with wet high-intensity magnetic preliminary rejection, one section of high intensity magnetic separation mine tailing
Mine tailing, grade is 13%~14%, and yield is 65%~60%.
It is an advantage of the invention that：Fine grain teeth cloth composite ore through wet type it is Semi-Autogenous-screening after, undersize is through pre-selection, thin
Sieve is regrinded, and magnetic-weight sorting process is sorted, and wet type pre-selecting can make ore under the conditions of coarse fraction, dish out 15% ~ 20% bulky grain
Qualified tailings, magnetic-sort again, can the pre-dressing rate of output 15 ~ 20%, the magnetic ore deposit of grade more than 65%, reduce reselection operation to
Ore deposit amount, compared with reverse flotation, reduces the link made up a prescription of flotation, reduce environmental pollution, it is to avoid flotation operation easily fluctuates
Phenomenon, and use centrifuge technology process flow is short, equipment is simple, easy to operate, free from environmental pollution, energy-saving.
Claims (1)
1. a kind of pre-selection of fine grain teeth cloth composite ore coarse grain, magnetic-weight sorting process, it is characterised in that use is Semi-Autogenous, and wet type is pre-
Choosing, Continuous Grinding, spun yarn evenness, the separation operation system of magnetic-again is comprised the following steps that：
A) by grade be 31%~33%, magnetic iron content be 40~60%, granularity for below 300mm raw ore after Semi-Autogenous,
The product that granularity is reached below -3mm enters to wet type pre-selecting, and described wet type pre-selecting is pre- using the pre-selection of wet type weak magnetic and wet high-intensity magnetic
Choosing, the big grain gangue and lean intergrowth of jettisoning yield 15%~20%；
B) mine tailing of wet type weak magnetic pre-selection feeds wet high-intensity magnetic pre-selection, and wet high-intensity magnetic preliminary rejection is used as mine tailing jettisoning；Wet type is weak
The pre- concentrate selection of magnetic and the pre- concentrate selection of wet high-intensity magnetic merge into the mixed magnetic concentrate of wet type pre-selecting and feed two sections of Continuous Grinding operations；
C) two sections of Continuous Grinding operations described in use classifying cyclone closed circuit grinding operation twice, that is, preselect mixed magnetic concentrate and give
Enter scalping cyclone closed circuit grinding operation, scalping hydrocyclone sand feeds one section of ball mill, one section of ball mill ore discharging
Return to scalping cyclone classification；Scalping cyclone overflow feeds secondary grading cyclone closed circuit grinding operation, secondary
Classifying cyclone sand setting feeds two sections of ball mills, and two sections of ball milling ore discharge products return to secondary grading cyclone classification, secondary grading
Cyclone overflow granularity reaches -320 mesh 90 ~ 95%；
D) secondary grading cyclone overflow feeds one section of weak magnetic operation, and one section of inferior fine magnetite concentrate feeds two sections of weak magnetic operations, and two sections weak
Magnetic concentrate feeds dusting cover, and dusting cover oversize returns to secondary grading cyclone classification, and dusting cover undersize is the magnetic selected in advance
Property concentrate, its grade is 65% ~ 66%, and yield is 15% ~ 20%, before one section of weakly magnetic tailings and two sections of weakly magnetic tailingses merge and feed strong magnetic
Big well is concentrated, and the underflow product after concentration feeds one section strong magnetic operation, and the overflow after concentration feeds recirculated water, one section strong magnetic
The concentrate for being elected to be industry feeds reselection operation, and the one section strong mine tailing of magnetic operation is used as mine tailing jettisoning；
E) reselection operation described in uses one section of roughing centrifuge, one section of selected centrifuge, and one section is scanned closing for centrifuge formation
Road system, the concentrate of one section of roughing centrifuge feeds one section of selected centrifuge, and the mine tailing of one section of roughing centrifuge feeds one section and sweeps
Centrifuge, one section of concentrate of selected centrifuge is selected to be combined into final concentrate with dusting cover undersize, grade is 65.5%~66%, yield
It is 35%-40%, one section of mine tailing of selected centrifuge returns to one section of roughing centrifuge, and one section of concentrate for scanning centrifuge returns to one section
Roughing centrifuge, one section of mine tailing for scanning centrifuge is combined into true tailings with wet high-intensity magnetic preliminary rejection, one section of high intensity magnetic separation mine tailing,
Grade is 13%~14%, and yield 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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| CN106492977A (en) * | 2016-10-14 | 2017-03-15 | 鞍钢集团矿业有限公司 | The strong magnetic reverse floatation process of lean hematite high pressure roller mill, weak magnetic |
| 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 |
| 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 |
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| 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 |
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