CN105032610A - High-pressure roller selective comminuting and magnetic separating method for lean magnetite ore - Google Patents

High-pressure roller selective comminuting and magnetic separating method for lean magnetite ore Download PDF

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Publication number
CN105032610A
CN105032610A CN201510586111.XA CN201510586111A CN105032610A CN 105032610 A CN105032610 A CN 105032610A CN 201510586111 A CN201510586111 A CN 201510586111A CN 105032610 A CN105032610 A CN 105032610A
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magnetic
pressure roller
sections
grinding
concentrate
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CN201510586111.XA
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杨春
盖壮
齐双飞
于光涛
王葵军
杜艳清
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Angang Group Mining Co Ltd
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Angang Group Mining Co Ltd
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Abstract

The invention relates to a high-pressure roller selective comminuting and magnetic separating method for lean magnetite ore. According to the method, ultrafine crushing is conducted on raw magnetite with a grade of 28.59% by means of a high-pressure grinding roller, and three times of ore grinding, two-section dewatering and three-section magnetic separation are conducted on the crushed product to obtain concentrate with a grade of 68.23% and metal recovery rate of 82.35%. The method has the advantages that the recovery rate of the final concentrate can be increased, and efficient recovery and utilization of resources are achieved; the dissociation degree of the product is high, excessive grinding degree is low, follow-up magnetic separation effect is good, and the separation precision of equipment is improved; on the premise that the quality of the concentrate is guaranteed, concentrate recovery rate can be increased, iron ore resources can be recovered and utilized fully and reasonably, and resource waste is reduced.

Description

The selective comminution of high pressure roller of chromium depleted zone and magnetic separating method
Technical field
The invention belongs to iron ore beneficiation technical field, particularly the selective comminution of a kind of high pressure roller of chromium depleted zone and magnetic separating method .
Background technology
In magnetic iron ore, the percentage composition of iron is high, and harmful element is few, and during smelting, the produced pollution is few, is important iron ore type, in the national economy and social development of China, occupies extremely important status.China's iron ore deposit main feature is " poor, thin, assorted ", average grade is low, the iron ore deposit proportion of complicated difficult choosing is larger, and the magnetic iron ore reserves of fine grain teeth cloth are huge, wherein Anshan type lean octahedral iron ore stone belongs to the poor iron ore of high silicon, low-sulfur phosphorus, red, content of limonite is less, part ore ferrosilite and ferric phosphate content relatively high, its disseminated grain size is thin and uneven.
Usually the production line adopted on process Anshan type lean octahedral iron ore is at present stage crushing-stage grinding-staged magnetic separation-spun yarn evenness mineral processing circuit, usual traditional handicraft is in the upper and lower grade difference of a certain granularity according to magnetic iron ore, by dusting cover, coarse granule product low for grade is sifted out raising concentrate grade, but constantly utilize along with to iron ore resource, the ore of phase commute choosing reduces, thin for chromium depleted zone ore disseminated grain size, the symbiosis of valuable mineral and gangue mineral is complicated, realize the monomer dissociation between mineral, first just can dissociate after superfine grinding being carried out to ore.By chromium depleted zone superfine for these disseminated grain sizes after magnetic gravity treatments not other, granularity requirements-325 order more than 90%, its mineral disaggregation degree just can reach 80%, but because the chromium depleted zone of the embedding cloth of superfine particle is after sorting, to obtain magnetic concentrate granularity superfine equally, magnetic in magnetic separation process is caused to be mingled with heavily, the particulate lean intergrowth be mingled with and gangue mineral cannot be removed by classification and dusting cover, once mineral are ground to less than 5 μm, no matter adopt magnetic separation, it is all more difficult that gravity treatment and method for floating deal with, the thin mud grade of deviating from from the magnetic dewater cone in ore dressing plant is all higher can illustrate above-mentioned viewpoint, as neat mountain, East Anshan, Gongchangling Tails, all there is clay mineral phenomenon problem in the ore dressing plant of saddle thousand mining company, have a strong impact on separating effect, increase metal loss, the rate of recovery reduces.
Therefore not only will improve the liberation degree of minerals of mineral in the sorting of process chromium depleted zone stone, and will reduce overground, optimize granularmetric composition, the dissociation degree and the sorting granularity that reach the best are only the key improving separation index.For above-mentioned discussion, R and D efficient Anshan type magnetite ore comminution method for separating, significant to the Appropriate application of China's iron ore deposit.
High-pressure roller mill is the main flow that current ore dressing field " much broken and lessmill technology " and " selective molecular attraction technology " both at home and abroad develop.High-pressure roller mill is a kind of New Grinding Devices based on the design of bed of material pulverization principle, and the principal character that the bed of material is pulverized is: crushed work pressure is large, granule interior is cracked, has certain selective molecular attraction effect, can improve the dissociation degree of product.
At present, high-pressure roller mill applied technical field mainly concentrates on cement industry, chemical industry and pellet fine grinding, in recent years along with the expansion of technical field, is applied in metal mine ore dressing field.
The application of current high-pressure roller mill in ore dressing field mainly concentrates on and reduces energy consumption and this 2 point of discarding coarse tailing, wherein in reduction energy consumption, can reduce brokenly energy consumption in Crushing process and steel consumption; In discarding coarse tailing, high pressure roller mill product can direct discarding coarse tailing, reduction sorting equipment operating rate and the pressure reducing Tailings Dam.Win initial success in reduction energy consumption and discarding coarse tailing for high pressure roller mill, but in whole mineral processing circuit, the potentiality of high pressure roller mill in reduction energy consumption are not also excavated out comprehensively, only rest on the energy-saving and cost-reducing of equipment pulverizing aspect; The tailings grade of discarding coarse tailing, higher than true tailings grade, to illustrate in the mine tailing of discarding coarse tailing also containing recuperable valuable mineral, when condition of technology and economy is feasible, then carries out secondary to it and sorts utilization and can waste huge manpower and financial resources.Simultaneously due in whole mineral processing circuit, to other sorting equipment technical parameters setting requirement, still lack directiveness effect, especially in the middle of the ore-dressing technique of Anshan type lean octahedral iron ore.
Summary of the invention
The invention provides a kind of rate of recovery that can improve final concentrate, improve the dissociation degree of comminution product, put the mog of corase grind mineral products, reduce the overground phenomenon of comminution product, the washability of magnetic iron ore after raising comminution, improves the selective comminution of high pressure roller and the magnetic separating method of the chromium depleted zone of concentrate grade and the rate of recovery.
The object of the invention is to be realized by following technical proposals:
The selective comminution of high pressure roller of chromium depleted zone of the present invention and magnetic separating method, it is characterized in that adopting high-pressure roller mill to pulverize chromium depleted zone, the product after pulverizing carries out ore grinding, and ore milling product carries out magnetic separation separation, and concrete steps are as follows:
(1) by crushing raw ore to below 20mm, feed high-pressure roller mill and carry out high pressure roller mill ultrafine grinding;
(2) product after high pressure roller mill ultrafine grinding is fed vibratory sieve to sieve, on-the-sieve material returns high-pressure roller mill and new feed and merges and pulverize, undersize material feeds primary ball mill and carries out an ore grinding, and one time ore milling product granularity accounts for 30-40% for-0.074mm content;
(3) ore milling product is fed one section of flux-weakening control and carry out one section of low intensity magnetic separation, the mine tailing of one section of low intensity magnetic separation enters tailings glass system, the concentrate of one section of low intensity magnetic separation feeds secondary ball mill and carries out secondary grinding, and secondary grinding product granularity accounts for 60-75% for-0.074mm content;
(4) secondary grinding product is fed magnetic dewater cone and carry out one section of dewatering operation, the mine tailing of one section of described dewatering operation enters tailings glass system, the concentrate of one section of dewatering operation feeds two sections of flux-weakening control and carries out two sections of low intensity magnetic separations, the mine tailing of two sections of low intensity magnetic separations feeds tailings glass system, the concentrate of two sections of low intensity magnetic separations feeds No. three ball mills and carries out tertiary grinding, and the granularity of tertiary grinding product accounts for 70-80% for-0.045mm content;
(5) tertiary grinding product feeds two sections of magnetic dewater cones and carries out two sections of magnetic force dewatering operations, the mine tailing of two sections of magnetic force dewatering operations feeds tailings glass system, the concentrate of two sections of magnetic force dewatering operations feeds three sections of low-intensity magnetic field drum magnetic separators and carries out three sections of low intensity magnetic separations, the mine tailing of three sections of low intensity magnetic separations enters tailings glass system, the concentrate of three sections of low intensity magnetic separations is final concentrate, and the final products of tailings glass system are mine tailing.
During high-pressure roller mill work, roll gap pressure is 4-6MPa, and roller speed is 1-3m/min, and roll gap is 2-7mm.
The sieve aperture of described vibratory sieve is 3mm.
One section of described flux-weakening control drum rotation speed is 16.9r/min, and magnetic induction intensity is 180mT, and magnetic declination is 15-20 °.
The magnetic induction intensity of one section of described magnetic dewater cone is 30-50mT.
Two sections of described drum magnetic separator drum rotation speeds are 16.9r/min, and magnetic induction intensity is 160mT, and magnetic declination is 15-20 °.
The magnetic induction intensity of two sections of described magnetic dewater cones is 30-50mT.
Three sections of described drum magnetic separator drum rotation speeds are 16.9r/min, and magnetic induction intensity is 160mT, and magnetic declination is 15-20 °.
Advantage of the present invention is:
1, pulverize with existing high pressure roller and throw tail method with magnetic separation and compare, the rate of recovery of final concentrate can be improved, reach high efficiente callback and the utilization of resource;
2, compare with sorting process with the tradition fragmentation of magnetic iron ore, the mog of thick product can be put, product dissociation degree is high, overground phenomenon is light, and follow-up magnetic separation is effective, improves the sharpness of separation of equipment, under the prerequisite ensureing concentrate quality, the concentrate rate of recovery can be improved, iron ore deposit is obtained fully, reasonably reclaim and utilize, reducing the wasting of resources;
3, characteristics of compact layout, by former independently centralized arrangement between dry separation and between screening, simplify arrangement, to save between the construction cost of factory building between independent dry separation and dry separation and between screening between the cost of transportation of band conveyer corridor, shorten work flow, reach the effect of once arranging many places income;
4, before ore grinding, reject abandoned mine to greatest extent, improve into mill grade, realize the energy-saving and cost-reducing of ore dressing plant, reduce beneficiation cost.
Accompanying drawing explanation
Fig. 1 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 1, the selective comminution of high pressure roller of chromium depleted zone of the present invention and magnetic separating method, it is characterized in that adopting high-pressure roller mill to pulverize chromium depleted zone, the product after pulverizing carries out ore grinding, and ore milling product carries out magnetic separation separation, and concrete steps are as follows:
(1) by crushing raw ore to below 20mm, feed high-pressure roller mill and carry out high pressure roller mill ultrafine grinding, during high-pressure roller mill work, roll gap pressure is 5MPa, roller speed is 1.6m/min, roll gap is 3mm, product employing sieve aperture after high pressure roller mill ultrafine grinding is that the vibration sieve of 3mm sieves, its on-the-sieve material returns high-pressure roller mill and new feed and merges and pulverize, the undersize material of below 3mm feeds primary ball mill and carries out an ore grinding, and one time ore milling product granularity accounts for 30-40% for-0.074mm content;
(2) ore milling products feed low-intensity magnetic field drum magnetic separator and carry out one section of low intensity magnetic separation, drum magnetic separator drum rotation speed is 16.9r/min, magnetic induction intensity is 180mT, magnetic declination is 18 °, one section of low intensity magnetic separation mine tailing enters tailings glass system, one section of low intensity magnetic separation concentrate carries out secondary grinding, and secondary grinding product granularity accounts for 60-75% for-0.074mm content;
(3) secondary grinding product feeds magnetic dewater cone and carries out one section of dehydration, the magnetic induction intensity of magnetic dewater cone is 50mT, dewatered tailings enters tailings glass system, dehydration concentrate feeds low-intensity magnetic field drum magnetic separator and carries out two sections of low intensity magnetic separations, drum magnetic separator drum rotation speed is 16.9r/min, magnetic induction intensity is 160mT, magnetic declination is 18 °, two sections of low intensity magnetic separation mine tailings enter tailings glass system, two sections of low intensity magnetic separation concentrate feed No. three ball mills and carry out tertiary grinding, and tertiary grinding product granularity accounts for 70-80% for-0.045mm content;
(4) tertiary grinding product feeds magnetic dewater cone and carries out two sections of dehydrations, the magnetic induction intensity of magnetic dewater cone is 50mT, dewatered tailings enters tailings glass system, dehydration concentrate feeds low-intensity magnetic field drum magnetic separator and carries out three sections of low intensity magnetic separations, and drum magnetic separator drum rotation speed is 16.9r/min, and magnetic induction intensity is 160mT, magnetic declination is 18 °, three sections of low intensity magnetic separation mine tailings enter tailings glass system, and three sections of low intensity magnetic separation concentrate are final concentrate, and the final products of tailings glass system are mine tailing.
The high pressure roller comminution technology of iron ore is applied in iron ore comminution sorting system, by rear increase in small, broken bits one section of high pressure roller mill ultrafine grinding, puts the ore grain size of thickness crumble product, increase treating capacity in small, broken bits, increase screen size, increase screening efficiency; Increase ball mill disposal ability, put corase grind mineral products fineness, optimize granularmetric composition, finally reaching to improve selects the object of factory's index can reduce excessively pulverizing of mineral grain, optimize granularmetric composition, solve the shortcoming that ore milling product is thick, large, the middle grain size content of fine fraction content is few for a long time, realize the timely sorting of monomer dissociation iron mineral, thus reach the final purpose improving separation index.
Anshan type lean octahedral iron ore obtains concentrate grade 68.23% after high pressure roller mill ultrafine grinding, tertiary grinding, two-stage dewatering, three stages of magnetic separation, metal recovery rate 82.35%.Pulverize with existing high pressure roller mill and compare with magnetic separation process for discarding tailings, concentrate grade improves 0.18%, and metal recovery rate improves 1.88%; Compared with traditional handicraft, primary grinding fineness puts thick 10%, and secondary grinding fineness puts thick 10%, and three sections of mogs put thick 5%, and concentrate grade improves 0.23%, and metal recovery rate improves 2.05%.

Claims (8)

1. the selective comminution of the high pressure roller of chromium depleted zone and a magnetic separating method, it is characterized in that adopting high-pressure roller mill to pulverize chromium depleted zone, the product after pulverizing carries out ore grinding, and ore milling product carries out magnetic separation separation, and concrete steps are as follows:
(1) by crushing raw ore to below 20mm, feed high-pressure roller mill and carry out high pressure roller mill ultrafine grinding;
(2) product after high pressure roller mill ultrafine grinding is fed vibratory sieve to sieve, on-the-sieve material returns high-pressure roller mill and new feed and merges and pulverize, undersize material feeds primary ball mill and carries out an ore grinding, and one time ore milling product granularity accounts for 30-40% for-0.074mm content;
(3) ore milling product is fed one section of flux-weakening control and carry out one section of low intensity magnetic separation, the mine tailing of one section of low intensity magnetic separation enters tailings glass system, the concentrate of one section of low intensity magnetic separation feeds secondary ball mill and carries out secondary grinding, and secondary grinding product granularity accounts for 60-75% for-0.074mm content;
(4) secondary grinding product is fed magnetic dewater cone and carry out one section of dewatering operation, the mine tailing of one section of described dewatering operation enters tailings glass system, the concentrate of one section of dewatering operation feeds two sections of flux-weakening control and carries out two sections of low intensity magnetic separations, the mine tailing of two sections of low intensity magnetic separations feeds tailings glass system, the concentrate of two sections of low intensity magnetic separations feeds No. three ball mills and carries out tertiary grinding, and the granularity of tertiary grinding product accounts for 70-80% for-0.045mm content;
(5) tertiary grinding product feeds two sections of magnetic dewater cones and carries out two sections of magnetic force dewatering operations, the mine tailing of two sections of magnetic force dewatering operations feeds tailings glass system, the concentrate of two sections of magnetic force dewatering operations feeds three sections of low-intensity magnetic field drum magnetic separators and carries out three sections of low intensity magnetic separations, the mine tailing of three sections of low intensity magnetic separations enters tailings glass system, the concentrate of three sections of low intensity magnetic separations is final concentrate, and the final products of tailings glass system are mine tailing.
2. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, when it is characterized in that high-pressure roller mill works, roll gap pressure is 4-6MPa, and roller speed is 1-3m/min, and roll gap is 2-7mm.
3. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, is characterized in that the sieve aperture of described vibratory sieve is 3mm.
4. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, it is characterized in that one section of described flux-weakening control drum rotation speed is 16.9r/min, magnetic induction intensity is 180mT, and magnetic declination is 15-20 °.
5. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, is characterized in that the magnetic induction intensity of one section of described magnetic dewater cone is 30-50mT.
6. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, it is characterized in that two sections of described drum magnetic separator drum rotation speeds are 16.9r/min, magnetic induction intensity is 160mT, and magnetic declination is 15-20 °.
7. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, is characterized in that the magnetic induction intensity of two sections of described magnetic dewater cones is 30-50mT.
8. the selective comminution of the high pressure roller of chromium depleted zone according to claim 1 and magnetic separating method, it is characterized in that three sections of described drum magnetic separator drum rotation speeds are 16.9r/min, magnetic induction intensity is 160mT, and magnetic declination is 15-20.
CN201510586111.XA 2015-09-16 2015-09-16 High-pressure roller selective comminuting and magnetic separating method for lean magnetite ore Pending CN105032610A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105498949A (en) * 2016-01-05 2016-04-20 马钢(集团)控股有限公司 Lean magnetite mining-dressing integrated pre-concentrating process and device
CN106000638A (en) * 2016-05-20 2016-10-12 甘肃酒钢集团宏兴钢铁股份有限公司 Process for extracting iron from comprehensive tailings of refractory iron ores
CN108144741A (en) * 2016-12-05 2018-06-12 辽宁首钢硼铁有限责任公司 A kind of method that boron concentrate grade is improved except iron using high gradient vertical-ring magnetic separator
CN108144742A (en) * 2016-12-05 2018-06-12 辽宁首钢硼铁有限责任公司 A kind of closed circuit grinding method using combined and staged mode
CN108144740A (en) * 2016-12-05 2018-06-12 辽宁首钢硼铁有限责任公司 High pressure roller mill ultrafine grinding discarding coarse tailing method applied to ludwigite
CN110898961A (en) * 2019-11-27 2020-03-24 黑龙江工程学院 Self-circulation grinding and beneficiation method for fine screen
CN111013811A (en) * 2019-12-23 2020-04-17 鞍钢集团矿业有限公司 Thickness separation-gravity-magnetic combined mineral separation process for treating Anshan type iron ore
CN112718194A (en) * 2020-12-16 2021-04-30 安徽新建矿业工程技术有限责任公司 Magnetite series high-pressure roller grinding and combined tail polishing energy-saving crushing method
CN113385299A (en) * 2021-05-28 2021-09-14 鞍钢集团矿业有限公司 Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore

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Publication number Priority date Publication date Assignee Title
CN105498949A (en) * 2016-01-05 2016-04-20 马钢(集团)控股有限公司 Lean magnetite mining-dressing integrated pre-concentrating process and device
CN106000638A (en) * 2016-05-20 2016-10-12 甘肃酒钢集团宏兴钢铁股份有限公司 Process for extracting iron from comprehensive tailings of refractory iron ores
CN106000638B (en) * 2016-05-20 2017-09-26 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of refractory iron ore integrates mine tailing iron-extracting process
CN108144742B (en) * 2016-12-05 2020-08-14 辽宁首钢硼铁有限责任公司 Beneficiation process method for low-grade uranium, boron and iron associated ore by adopting high-pressure roller mill
CN108144742A (en) * 2016-12-05 2018-06-12 辽宁首钢硼铁有限责任公司 A kind of closed circuit grinding method using combined and staged mode
CN108144740A (en) * 2016-12-05 2018-06-12 辽宁首钢硼铁有限责任公司 High pressure roller mill ultrafine grinding discarding coarse tailing method applied to ludwigite
CN108144741B (en) * 2016-12-05 2020-05-08 辽宁首钢硼铁有限责任公司 Method for improving grade of boron concentrate by removing iron through high-gradient vertical ring magnetic separator
CN108144741A (en) * 2016-12-05 2018-06-12 辽宁首钢硼铁有限责任公司 A kind of method that boron concentrate grade is improved except iron using high gradient vertical-ring magnetic separator
CN110898961A (en) * 2019-11-27 2020-03-24 黑龙江工程学院 Self-circulation grinding and beneficiation method for fine screen
CN111013811A (en) * 2019-12-23 2020-04-17 鞍钢集团矿业有限公司 Thickness separation-gravity-magnetic combined mineral separation process for treating Anshan type iron ore
CN112718194A (en) * 2020-12-16 2021-04-30 安徽新建矿业工程技术有限责任公司 Magnetite series high-pressure roller grinding and combined tail polishing energy-saving crushing method
CN113385299A (en) * 2021-05-28 2021-09-14 鞍钢集团矿业有限公司 Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore
CN113385299B (en) * 2021-05-28 2022-06-14 鞍钢集团矿业有限公司 Magnetic-gravity-magnetic combined ore dressing process for treating lean magnetite ore

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Applicant after: Anshan Iron and Steel Group Mining Co., Ltd.

Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong

Applicant before: Anshan Iron & Steel Group Mining Co., Ltd.

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WD01 Invention patent application deemed withdrawn after publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20151111