CN102631984B - Hematite roasting, stage grinding, intermediate magnetic separation, coarse and fine separation, gravity concentration-magnetic separation technique - Google Patents
Hematite roasting, stage grinding, intermediate magnetic separation, coarse and fine separation, gravity concentration-magnetic separation technique Download PDFInfo
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Abstract
The invention belongs to the technical field of iron ore grading and especially relates to a hematite roasting, stage grinding, intermediate magnetic separation, fineness classifying, gravity concentration-magnetic separation technique, comprising raw ore roasting, first segment of closed loop grinding, primary grading, intermediate magnetic separation, fineness classifying and gravity concentration-magnetic separation. The technique is characterized by feeding the intermediate magnetic separation concentrate in a demagnetizer, grading the concentrate through fineness classifying, grading the material into rough granule level product and fine granule level product, feeding the rough granule level product in the fineness classifying procedure in a helical chute, demagnetizing the concentrate in the helical chute and performing screening procedure on the concentrate, serving the tailings in the helical chute and the oversize product in the screening procedure as middlings, performing secondary grading and second segment of closed loop grinding procedures on the middlings, and feeding the fine granule parts in the fineness classifying procedure in a dehydration tank, a permanent magnetic machine and a magnetic field screening machine to perform magnetic separation procedure. The comprehensive concentrate is composed of screening concentrate and magnetic field screening machine concentrate, and the compressive tailings are composed of intermediate magnetic separation tailings, dehydration tank tailings, permanent magnetic machine tailings and magnetic field screening machine tailings. The technique has the advantages that the sorting efficiency of the whole procedure is improved, the screening concentrate in rough granule procedure and the magnetic field screening machine concentrate in fine granule procedure can reach 65-67%, the level of the comprehensive concentrate is higher than 65-67%, and the level of the compressive tailings is reduced to 8-10%.
Description
Technical field
The invention belongs to iron ore and sort technical field, especially relate to a kind of bloodstone roasting, stage grinding, middle magnetic, thickness grading, gravity treatment-magnetic separation process.
Background technology
Bloodstone stone is the important iron ore type of China.Bloodstone roasting-magnetic separation is traditional ore-dressing technique.As shown in Figure 1, grade is that 25～30% raw ore feeds after roasting by primary grinding and one section closed circuit grinding operation that classification is formed.Magnetic operation during one section classification overflow feeds, middle magnetic concentrate feeds the thickness grading operation and is classified into thick, thin two kinds of products after taking off magnetic.Coarse component feeds reselection operation, and selecting grade through thick spiral shell, smart spiral shell operation is 63～64% gravity concentrates, the chats self-loopa, and thick spiral shell, smart spiral shell operation mine tailing feed by secondary grinding and two sections closed circuit grinding operations that classification is formed.Two sections classification overflows are through two sections dehydrations, two sections permanent magnetism operation sortings, and two sections permanent magnetism concentrate return the thickness grading operation.-200 order content of thickness grading operation classification the fine fraction more than 80% through one section dehydration, one section permanent magnetism, take off magnetic, fine screening and divide after, selecting grade is that 62～63% sieves are smart, product feeds the thick spiral shell operation of gravity treatment on the sieve.The comprehensive concentrate of the smart formation of gravity concentrate and sieve, grade about 63%.Middle magnetic tail ore deposit, one section dewatered tailings, one section permanent magnetism mine tailing, two sections dewatered tailings and two sections permanent magnetism mine tailings constitute comprehensive mine tailing, grade 10～11%.
This technology mainly contains following shortcoming: 1, because spiral chute is to carry out sorting according to proportion and the granularity difference of mineral, gravity concentrate is that the inner edge product---fine grain high-grade concentrate and coarse grained rich intergrowth obtained after the smart spiral shell layering of smart spiral shell operation concentrate intercepting divided band, influenced by magnetic coagulation, the gravity concentrate grade has only 63～64%.2, the permanent magnetism of fine fraction, dusting cover operation are subjected to that magnetic is mingled with, magnetic coagulation etc. influences, and the efficiency of separation is not high, and sieve elaboration position has only 62～63%; 3, comprehensive concentrate grade has only about 63%, and comprehensive tailings grade also reaches about 10～11%, and technical indicator is not ideal; 4, product feeds the thick spiral shell operation of gravity treatment on the sieve, and particulate operation separating effect influences the coarse grain operation, and whole flow process is longer in addition, and is wayward, and index fluctuates easily.
Summary of the invention
The purpose of this invention is to provide a kind of technology simple, stablize, be convenient to control, the efficiency of separation is higher, can improve a kind of bloodstone roasting, stage grinding, middle magnetic, thickness grading, the gravity treatment-magnetic separation process of the technical-economic index of the utilization of resources effect of bloodstone stone and ore dressing enterprise
The objective of the invention is to realize by following technical proposals:
According to a kind of bloodstone roasting of the present invention, stage grinding, middle magnetic, thickness grading, gravity treatment-magnetic separation process, comprise whole ore roasting, one section closed circuit grinding, scalping, middle magnetic, thickness grading and gravity treatment-magnetic separation, it is characterized in that:
1) the magnetic concentrate feeds demagnetizer in, classification is carried out in the thickness grading operation, and stock grading is become coarse fraction and two kinds of products of fine fraction,
2) the coarse fraction grade of thickness grading operation is 45～50%, the product of-200 order grain size contents 35～50% feeds spiral chute, the concentrate of spiral chute feeds the dusting cover operation after demagnetizer takes off magnetic, select grade and be 65～67% dusting cover concentrate, and product feeds secondary classification and two sections closed circuit grinding operations as chats on the sieve of the mine tailing of the spiral chute of grade 40～45% and dusting cover operation
3) magnetic operation during the fine fraction product of-200 order grain size contents 60～70% of secondary classification returns, the coarse fraction product of secondary classification are returned secondary classification formation closed cycle after feeding secondary grinding,
4) grade 35～40% of thickness grading operation, the fine fraction of-200 order content more than 90% feed drench pit, permanent magnetic motor, magnetic field screening machine and carry out magnetic concentration working, select grade and be 65～67% magnetic field screening machine concentrate,
5) comprehensive concentrate is made of dusting cover concentrate and magnetic field screening machine concentrate, and grade is 65～67%; Comprehensive mine tailing is made of middle magnetic tail ore deposit, drench pit mine tailing, permanent magnetic motor mine tailing and magnetic field screening machine mine tailing, and grade is 8～10%.
The magnetic induction intensity of magnetic operation is 0.2～0.3T in described.
Described demagnetizer is that field intensity is 90～192.5mT.
Advantage of the present invention: because the present invention has adopted spiral chute after the thickness grading operation, demagnetizer, dusting cover operation and the screening machine operation of magnetic separator magnetic field, given full play to the dusting cover strictness by the characteristics of size sorting and DQ-II type harmonization formula demagnetizer efficiently, BX type permanent-magnet drum type magnetic separator, the effect of magnetic field screening machine, the whole flow process efficiency of separation improves, the magnetic field screening machine concentrate of the sieve elaboration position of coarse grain operation and particulate operation all can reach 65～67%, comprehensive concentrate grade reaches more than 65～67%, comprehensive tailings grade also is down to 8～10%, and technical indicator is obviously improved.
Technological process letter of the present invention is simple, and technical indicator is stable, is convenient to control.
Description of drawings
Fig. 1 is former bloodstone roasting, stage grinding, middle magnetic, thickness grading, gravity treatment-magnetic separation process flow chart.
Fig. 2 sets up gravity treatment-sieving technology flow chart for before the hematite reverse flotation operation of the present invention.
The specific embodiment
Further specify the specific embodiment of the present invention below in conjunction with accompanying drawing.
Embodiment
As shown in Figure 2, a kind of bloodstone roasting of the present invention, stage grinding, middle magnetic, thickness grading, gravity treatment-magnetic separation process, comprise that head grade is that 25～30% bloodstone stone is through magnetizing roast, the magnetic rate reaches more than 37%, feed one section closed circuit grinding, be milled to that-200 order grain size contents reach 50～70% in the scalping overflow, scalping and gravity treatment-magnetic separation, the middle magnetic concentrate of grade 40～45% and the middle magnetic tail ore deposit gravity treatment-magnetic separation of grade 7～9% were selected in the magnetic operation during the scalping overflow fed, and it is characterized in that:
1) the magnetic concentrate feeds demagnetizer in, classification is carried out in the thickness grading operation, and stock grading is become coarse fraction and two kinds of products of fine fraction;
2) the coarse fraction grade of thickness grading operation is 45～50%, the product of-200 order grain size contents 35～50% feeds spiral chute, the concentrate of spiral chute feeds the dusting cover operation after demagnetizer takes off magnetic, select grade and be 65～67% dusting cover concentrate, and product feeds secondary classification and two sections closed circuit grinding operations as chats on the sieve of the mine tailing of the spiral chute of grade 40～45% and dusting cover operation;
The magnetic induction intensity of magnetic operation is 0.2～0.3T in of the present invention, the demagnetizer of installing before thickness grading and the dusting cover is DQ-II type harmonization formula demagnetizer efficiently, the characteristics of this demagnetizer are that running is steadily reliable, high-frequency is taken off magnetic, the demagnetizing field damped oscillation time is long, intermittent time is short, and it is remarkable to take off the magnetic effect;
3) magnetic operation during the fine fraction product of-200 order grain size contents 60～70% of secondary classification returns, the coarse fraction product of secondary classification are returned secondary classification formation closed cycle after feeding secondary grinding;
4) grade 35～40% of thickness grading operation, the fine fraction of-200 order content more than 90% feed drench pit, permanent magnetic motor, magnetic field screening machine and carry out magnetic concentration working, select grade and be 65～67% magnetic field screening machine concentrate;
5) comprehensive concentrate is made of dusting cover concentrate and magnetic field screening machine concentrate, and grade is 65～67%; Comprehensive mine tailing is made of middle magnetic tail ore deposit, drench pit mine tailing, permanent magnetic motor mine tailing and magnetic field screening machine mine tailing, and grade is 8～10%.
Permanent magnetic motor of the present invention adopts BX type permanent-magnet drum type magnetic separator.BX type permanent-magnet drum type magnetic separator characteristics are: drum surface has uniform high-gradient magnetic field, magnetic pole number of poles 8 extremely more than, magnetic is 140 ° of cornerites, there is flushing water in selected district, mine tailing overfall height, concentration ratio and the rate of recovery are all more high.
Magnetic field of the present invention screening machine operation principle is: in being lower than the weak relative uniform magnetic field of tens of times of common permanent magnetic motors, utilize effective reunion of monomer magnetic iron ore, increase granularity difference and density contrast with intergrowth, realize separating of monomer magnetic iron ore and intergrowth by the sieve of the special use in the magnetic field.Be characterized in: the adaptability to fluctuations such as feed ore concentration, flow, dynamics is strong, the sharpness of separation height, and concentration ratio is big, and index is stable.
Claims (2)
1. a bloodstone roasting, stage grinding, middle magnetic, thickness grading, gravity treatment-magnetic separation process comprise whole ore roasting, one section closed circuit grinding, scalping, middle magnetic, thickness grading and gravity treatment-magnetic separation, it is characterized in that:
1) the magnetic concentrate feeds demagnetizer in, classification is carried out in the thickness grading operation, and stock grading is become coarse fraction and two kinds of products of fine fraction;
2) the coarse fraction grade of thickness grading operation is 45～50%, the product of-200 order grain size contents 35～50% feeds spiral chute, the concentrate of spiral chute feeds the dusting cover operation after demagnetizer takes off magnetic, select grade and be 65～67% dusting cover concentrate, and product feeds secondary classification and two sections closed circuit grinding operations as chats on the sieve of the mine tailing of the spiral chute of grade 40～45% and dusting cover operation;
The magnetic induction intensity of magnetic operation is 0.2～0.3T in described, and the demagnetizer of installing before thickness grading and the dusting cover is DQ-II type harmonization formula demagnetizer efficiently;
3) magnetic operation during the fine fraction product of-200 order grain size contents 60～70% of secondary classification returns, the coarse fraction product of secondary classification are returned secondary classification formation closed cycle after feeding secondary grinding;
4) grade 35～40% of thickness grading operation, the fine fraction of-200 order content more than 90% feed drench pit, permanent magnetic motor, magnetic field screening machine and carry out magnetic concentration working, select grade and be 65～67% magnetic field screening machine concentrate;
5) comprehensive concentrate is made of dusting cover concentrate and magnetic field screening machine concentrate, and grade is 65～67%; Comprehensive mine tailing is made of middle magnetic tail ore deposit, drench pit mine tailing, permanent magnetic motor mine tailing and magnetic field screening machine mine tailing, and grade is 8～10%.
2. bloodstone roasting according to claim 1, stage grinding, middle magnetic, thickness grading, gravity treatment-magnetic separation process, it is characterized in that: described demagnetizer is DQ-II type harmonization formula demagnetizer, and field intensity is 90～192.5mT.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103272684B (en) * | 2013-06-13 | 2014-11-05 | 鞍钢集团矿业公司 | Hematite stage grinding and magnetic-separation-flotation process |
| CN103736603B (en) * | 2013-12-26 | 2016-08-31 | 攀钢集团矿业有限公司 | A kind of ore-dressing technique of grind grading |
| CN105195303A (en) * | 2015-08-13 | 2015-12-30 | 中国地质科学院郑州矿产综合利用研究所 | Novel mineral processing technology for improving quality and increasing yield by magnetic field screening method |
| CN105195302A (en) * | 2015-08-13 | 2015-12-30 | 中国地质科学院郑州矿产综合利用研究所 | Mineral processing technology for improving quality and increasing yield by magnetic field screening method |
| 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 |
| 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 |
| 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 |
| CN108405179A (en) * | 2018-03-07 | 2018-08-17 | 鞍钢集团矿业有限公司 | A kind of method of magnetic separation-roasting-magnetic separation process recycling magnetic tailing |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Patentee before: Angang Group Mine Company |