CN104888947A - Magnetic separation-centrifuge separation technology of micro-fine particle dissemination magnet-hematite mixed ore - Google Patents
Magnetic separation-centrifuge separation technology of micro-fine particle dissemination magnet-hematite mixed ore Download PDFInfo
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Abstract
The invention relates to a magnetic separation-centrifuge separation technology of micro-fine particle dissemination magnet-hematite mixed ore. The magnetic separation-centrifuge separation technology is characterized by adopting a grading operating system of wet-type semi-autogenous grinding, stage grinding, phase flux weakening-strong magnetism, and strong magnetism concentrate-centrifuge; the magnetic separation-centrifuge separation technology has the following advantages: the wet-type autogenous grinding process is adopted, so that the crushing operation is reduced; the stage grinding and stage magnetic separation method is adopted, the single magnetic separation method is adopted to recycle vignite reaching monomer separation in advance so as to throw and collect iron mineral reaching monomer separation, the effects of cost decreasing and benefit increasing are realized, and the mineral reaching monomer separation is prevented from entering next operation; the centrifuge is adopted for grading, the technological processes are short, and the equipment is simple and easy to operate, does not pollute the environment, saves energy and reduces consumption.
Description
Technical field
The invention belongs to iron ore beneficiation technical field, particularly a kind of micro-
fine-grained disseminated grain magnetic-red composite ore
magnetic separation-centrifuge 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.
Original ore size 0-12mm, through two sections of Continuous Grindings, granularity reaches-200 order content more than 80%, after one section of weak magnetic strength magnetic separation, to mix magnetic concentrate regrinding, granularity reaches-325 order content 85% ~ 90%, then 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, flotation operation also can cause environmental pollution simultaneously.
Summary of the invention
The object of this invention is to provide the magnetic separation-centrifuge sorting process of a kind of fine grain teeth cloth magnetic-red composite ore, adopt wet self-grinding technique, decrease crushing operation, the method of employing stage mill staged magnetic separation, can the method for single magnetic separation be adopted to reclaim in advance the vignite reaching monomer dissociation, realize the iron mineral of monomer early to throw early to receive, cost efficiency, the mineral of monomer dissociation are avoided to enter next section of operation, employing centrifuge sorts, 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:
Magnetic separation-centrifuge the sorting process of a kind of fine grain teeth cloth magnetic-red composite ore of the present invention, is characterized in that: adopt wet type Semi-Autogenous, stage grinding, stage weak magnetic-strong magnetic, strong magnetic essence-from
Scheming sorting operation system, concrete steps are as follows:
A) raw ore that grade is 31% ~ 33%, Armco magnetic iron content is 40 ~ 60%, granularity is below 300mm through ore pocket feed wet type Semi-Autogenous-screening operation, under its sieve ,-3mm product feeds one section of closed circuit grinding classification system and carries out primary grinding and classification process, and oversize returns that wet type is Semi-Autogenous regrinds;
B) sand setting after one section of closed circuit grinding classification returns one section of closed circuit grinding classification system and regrinds, and the overflow that after one section of closed circuit grinding classification, granularity reaches-200 orders more than 85% feeds one section of low intensity magnetic separation operation;
C) mine tailing of one section of low intensity magnetic separation operation feeds one section of high intensity magnetic separation operation, one section of low intensity magnetic separation operation concentrate and one section of high intensity magnetic separation operation concentrate are combined into mixed magnetic concentrate, grade is 40% ~ 42%, productive rate is 70% ~ 72%, mixed magnetic concentrate feeds two sections of closed circuit grinding classification operations, sand setting after two sections of Grading Overflow granularities reach-325 order 90 ~ 95%, two sections of closed circuit grinding classifications returns two sections of closed circuit grinding classification systems and regrinds;
D) two sections of Grading Overflows that granularity reaches-325 orders 90% ~ 95% feed two sections of low intensity magnetic separation operations, sort out two sections of inferior fine magnetite concentrates and two sections of weakly magnetic tailingses, the grade of its two sections of inferior fine magnetite concentrates is 62.5% ~ 63%, two sections of inferior fine magnetite concentrates are fed three sections of low intensity magnetic separation operations, sort out three sections of inferior fine magnetite concentrates and three sections of weakly magnetic tailingses, the grade of its three sections of inferior fine magnetite concentrates is 64.5% ~ 65%, three sections of inferior fine magnetite concentrates are fed four sections of low intensity magnetic separation operations, sort out four sections of inferior fine magnetite concentrates and four sections of weakly magnetic tailingses, the grade of its four sections of inferior fine magnetite concentrates is 65% ~ 65.5%, productive rate 15% ~ 20%, two sections of weakly magnetic tailingses, three sections of weakly magnetic tailingses and four sections of weakly magnetic tailingses feed two sections of high intensity magnetic separation operations in the lump,
The product that two sections of Grading Overflow granularities reach-325 orders 90% ~ 95% feeds two sections of low intensity magnetic separation operations, the concentrate grade 62.5% ~ 63% of two sections of low intensity magnetic separation operations, the concentrate of two sections of low intensity magnetic separation operations feeds three sections of low intensity magnetic separation operations, the concentrate grade of three sections of low intensity magnetic separation operations is 64.5% ~ 65%, the concentrate of three sections of low intensity magnetic separation operations feeds four sections of low intensity magnetic separation operations, after four stages of magnetic separation machines sort, obtains the inferior fine magnetite concentrate of grade 65% ~ 65.5%, productive rate 15% ~ 20%; Two sections of low intensity magnetic separation operation mine tailings, three sections of low intensity magnetic separation operation mine tailings and four sections of low intensity magnetic separation operation mine tailings feed two sections of high intensity magnetic separation operations in the lump, and sorting out grade is 45.20% ~ 46% 2 section of high intensity magnetic separation concentrate, and two sections of high intensity magnetic separation concentrate feed centrifuge sorting operation,
E) two sections of high intensity magnetic separation concentrate feed centrifuge sorting operation, described centrifuge sorting operation adopts one section to roughly select centrifuge, one section of selected centrifuge and one section scan the closed circuit Beneficiation flowsheet of centrifuge, 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 magnetic concentrate of one section of selected centrifuge are combined into final concentrate, its grade is 65% ~ 65.5%, 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 one section of high intensity magnetic separation operation mine tailing scanning centrifuge, two sections of high intensity magnetic separation operation mine tailings are combined into true tailings, its grade is 13% ~ 14%, productive rate is 65% ~ 60%.
Advantage of the present invention is:
1) due to present invention process have employed wet type Semi-Autogenous-sieving technology, in decreasing, thin broken operation;
2) the present invention have employed mill stage, choosing stage in process, and the method for single magnetic separation reclaims the magnetic ore deposit of monomer dissociation in advance.Mainly owing to containing a certain amount of magnetic ore deposit in fine grain teeth cloth magnetic iron ore and bloodstone composite ore, when the magnetic ore deposit in mineral reaches monomer dissociation time, adopt the method for single magnetic separation, can the pre-dressing rate of output 15 ~ 20%, grade 65% magnetic iron ore, significantly reduce subsequent job mine-supplying quantity;
3) adopt centrifuge to sort, 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 technological process is short, technique is simple, easy to operate, 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 the magnetic separation-centrifuge sorting process flow chart of fine grain teeth cloth magnetic of the present invention-red composite ore.
Detailed description of the invention
The specific embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
As
shown in Fig. 2, the magnetic separation-centrifuge sorting process of a kind of fine grain teeth cloth magnetic-red composite ore of the present invention, is characterized in that: adopt wet type Semi-Autogenous, stage grinding, stage weak magnetic-strong magnetic, Qiang Ci
Essence-centrifuge sorting operation system, concrete steps are as follows:
A) raw ore that grade is 31% ~ 33%, Armco magnetic iron content is 40 ~ 60%, granularity is below 300mm through ore pocket feed wet type Semi-Autogenous-screening operation, under its sieve ,-3mm product feeds one section of closed circuit grinding classification system and carries out primary grinding and classification process, and oversize returns that wet type is Semi-Autogenous regrinds;
B) sand setting after one section of closed circuit grinding classification returns one section of closed circuit grinding classification system and regrinds, and the overflow that after one section of closed circuit grinding classification, granularity reaches-200 orders more than 85% feeds one section of low intensity magnetic separation operation;
C) mine tailing of one section of low intensity magnetic separation operation feeds one section of high intensity magnetic separation operation, one section of low intensity magnetic separation operation concentrate and one section of high intensity magnetic separation operation concentrate are combined into mixed magnetic concentrate, grade is 40% ~ 42%, productive rate is 70% ~ 72%, mixed magnetic concentrate feeds two sections of closed circuit grinding classification operations, sand setting after two sections of Grading Overflow granularities reach-325 order 90 ~ 95%, two sections of closed circuit grinding classifications returns two sections of closed circuit grinding classification systems and regrinds;
D) two sections of Grading Overflows that granularity reaches-325 orders 90% ~ 95% feed two sections of low intensity magnetic separation operations, sort out two sections of inferior fine magnetite concentrates and two sections of weakly magnetic tailingses, the grade of its two sections of inferior fine magnetite concentrates is 62.5% ~ 63%, two sections of inferior fine magnetite concentrates are fed three sections of low intensity magnetic separation operations, sort out three sections of inferior fine magnetite concentrates and three sections of weakly magnetic tailingses, the grade of its three sections of inferior fine magnetite concentrates is 64.5% ~ 65%, three sections of inferior fine magnetite concentrates are fed four sections of low intensity magnetic separation operations, sort out four sections of inferior fine magnetite concentrates and four sections of weakly magnetic tailingses, the grade of its four sections of inferior fine magnetite concentrates is 65% ~ 65.5%, productive rate 15% ~ 20%, two sections of weakly magnetic tailingses, three sections of weakly magnetic tailingses and four sections of weakly magnetic tailingses feed two sections of high intensity magnetic separation operations in the lump,
The product that two sections of Grading Overflow granularities reach-325 orders 90% ~ 95% feeds two sections of low intensity magnetic separation operations, the concentrate grade 62.5% ~ 63% of two sections of low intensity magnetic separation operations, the concentrate of two sections of low intensity magnetic separation operations feeds three sections of low intensity magnetic separation operations, the concentrate grade of three sections of low intensity magnetic separation operations is 64.5% ~ 65%, the concentrate of three sections of low intensity magnetic separation operations feeds four sections of low intensity magnetic separation operations, after four stages of magnetic separation machines sort, obtains the inferior fine magnetite concentrate of grade 65% ~ 65.5%, productive rate 15% ~ 20%; Two sections of low intensity magnetic separation operation mine tailings, three sections of low intensity magnetic separation operation mine tailings and four sections of low intensity magnetic separation operation mine tailings feed two sections of high intensity magnetic separation operations in the lump, and sorting out grade is 45.20% ~ 46% 2 section of high intensity magnetic separation concentrate, and two sections of high intensity magnetic separation concentrate feed centrifuge sorting operation.
Adopt wet self-grinding technique, decrease crushing operation, the method of employing stage mill staged magnetic separation, can the method for single magnetic separation be adopted to reclaim in advance the vignite reaching monomer dissociation, realize the iron mineral of monomer early to throw early to receive, cost efficiency, avoids the mineral of monomer dissociation to enter next section of operation.
E) two sections of high intensity magnetic separation concentrate feed centrifuge sorting operation, described centrifuge sorting operation adopts one section to roughly select centrifuge, one section of selected centrifuge and one section scan the closed circuit Beneficiation flowsheet of centrifuge, 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 magnetic concentrate of one section of selected centrifuge are combined into final concentrate, its grade is 65% ~ 65.5%, 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 one section of high intensity magnetic separation operation mine tailing scanning centrifuge, two sections of high intensity magnetic separation operation mine tailings are combined into true tailings, its grade is 13% ~ 14%, productive rate is 65% ~ 60%.
Employing centrifuge sorts, and 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 technological process is short, technique is simple, easy to operate, energy-saving and cost-reducing.
Claims (1)
1. magnetic separation-centrifuge sorting process of fine grain teeth cloth magnetic-red composite ore, is characterized in that:
Employing wet type is Semi-Autogenous, stage grinding, stage weak magnetic-strong magnetic, strong magnetic essence-centrifuge sorting operation system, and concrete steps are as follows:
A) raw ore that grade is 31% ~ 33%, Armco magnetic iron content is 40 ~ 60%, granularity is below 300mm through ore pocket feed wet type Semi-Autogenous-screening operation, under its sieve ,-3mm product feeds one section of closed circuit grinding classification system and carries out primary grinding and classification process, and oversize returns that wet type is Semi-Autogenous regrinds;
B) sand setting after one section of closed circuit grinding classification returns one section of closed circuit grinding classification system and regrinds, and the overflow that after one section of closed circuit grinding classification, granularity reaches-200 orders more than 85% feeds one section of low intensity magnetic separation operation;
C) mine tailing of one section of low intensity magnetic separation operation feeds one section of high intensity magnetic separation operation, one section of low intensity magnetic separation operation concentrate and one section of high intensity magnetic separation operation concentrate are combined into mixed magnetic concentrate, grade is 40% ~ 42%, productive rate is 70% ~ 72%, mixed magnetic concentrate feeds two sections of closed circuit grinding classification operations, sand setting after two sections of Grading Overflow granularities reach-325 order 90 ~ 95%, two sections of closed circuit grinding classifications returns two sections of closed circuit grinding classification systems and regrinds;
D) two sections of Grading Overflows that granularity reaches-325 orders 90% ~ 95% feed two sections of low intensity magnetic separation operations, sort out two sections of inferior fine magnetite concentrates and two sections of weakly magnetic tailingses, the grade of its two sections of inferior fine magnetite concentrates is 62.5% ~ 63%, two sections of inferior fine magnetite concentrates are fed three sections of low intensity magnetic separation operations, sort out three sections of inferior fine magnetite concentrates and three sections of weakly magnetic tailingses, the grade of its three sections of inferior fine magnetite concentrates is 64.5% ~ 65%, three sections of inferior fine magnetite concentrates are fed four sections of low intensity magnetic separation operations, sort out four sections of inferior fine magnetite concentrates and four sections of weakly magnetic tailingses, the grade of its four sections of inferior fine magnetite concentrates is 65% ~ 65.5%, productive rate 15% ~ 20%, two sections of weakly magnetic tailingses, three sections of weakly magnetic tailingses and four sections of weakly magnetic tailingses feed two sections of high intensity magnetic separation operations in the lump,
The product that two sections of Grading Overflow granularities reach-325 orders 90% ~ 95% feeds two sections of low intensity magnetic separation operations, the concentrate grade 62.5% ~ 63% of two sections of low intensity magnetic separation operations, the concentrate of two sections of low intensity magnetic separation operations feeds three sections of low intensity magnetic separation operations, the concentrate grade of three sections of low intensity magnetic separation operations is 64.5% ~ 65%, the concentrate of three sections of low intensity magnetic separation operations feeds four sections of low intensity magnetic separation operations, after four stages of magnetic separation machines sort, obtains the inferior fine magnetite concentrate of grade 65% ~ 65.5%, productive rate 15% ~ 20%; Two sections of low intensity magnetic separation operation mine tailings, three sections of low intensity magnetic separation operation mine tailings and four sections of low intensity magnetic separation operation mine tailings feed two sections of high intensity magnetic separation operations in the lump, and sorting out grade is 45.20% ~ 46% 2 section of high intensity magnetic separation concentrate, and two sections of high intensity magnetic separation concentrate feed centrifuge sorting operation,
E) two sections of high intensity magnetic separation concentrate feed centrifuge sorting operation, described centrifuge sorting operation adopts one section to roughly select centrifuge, one section of selected centrifuge and one section scan the closed circuit Beneficiation flowsheet of centrifuge, 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 magnetic concentrate of one section of selected centrifuge are combined into final concentrate, its grade is 65% ~ 65.5%, 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 one section of high intensity magnetic separation operation mine tailing scanning centrifuge, two sections of high intensity magnetic separation operation mine tailings are combined into true tailings, its grade is 13% ~ 14%, productive rate is 65% ~ 60%.
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| CN106216082A (en) * | 2016-08-18 | 2016-12-14 | 鞍钢集团矿业有限公司 | Low-grade Anshan type iron mine composite ore ore-dressing technique |
| 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 |
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| CN108993756A (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-tower grinds magnetic separation process |
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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 |
| CN107252730A (en) * | 2017-06-16 | 2017-10-17 | 鞍钢集团矿业有限公司 | A kind of composite ore high pressure roller mill wind is classified again, tower mill, magnetic weight sorting process |
| CN107790283A (en) * | 2017-10-19 | 2018-03-13 | 中冶北方（大连）工程技术有限公司 | A kind of amphibole type proto culture sorting process |
| 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 |
| CN108993756A (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-tower grinds magnetic separation process |
| CN112844807A (en) * | 2020-12-21 | 2021-05-28 | 鞍钢集团矿业有限公司 | Magnetic-gravity combined recleaning process for micro-fine particle hematite strong magnetic tailings |
| CN114405675A (en) * | 2021-12-31 | 2022-04-29 | 玉溪大红山矿业有限公司 | Ore dressing process for iron ore mixed ore |
| CN114405675B (en) * | 2021-12-31 | 2023-05-16 | 玉溪大红山矿业有限公司 | Mineral separation process for iron ore mixed ore |
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