CN110586315B - A kind of all-dry sorting method of iron ore - Google Patents
A kind of all-dry sorting method of iron ore Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000012141 concentrate Substances 0.000 claims abstract description 57
- 239000006148 magnetic separator Substances 0.000 claims abstract description 38
- 239000004576 sand Substances 0.000 claims abstract description 22
- 238000009837 dry grinding Methods 0.000 claims abstract description 19
- 239000004566 building material Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract 3
- 239000000463 material Substances 0.000 claims description 42
- 238000000926 separation method Methods 0.000 claims description 27
- 238000000227 grinding Methods 0.000 claims description 11
- 230000002000 scavenging effect Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims 2
- 238000007605 air drying Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 238000003801 milling Methods 0.000 abstract description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 description 10
- 239000011707 mineral Substances 0.000 description 10
- 239000004575 stone Substances 0.000 description 8
- 238000012216 screening Methods 0.000 description 6
- 230000002950 deficient Effects 0.000 description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004094 preconcentration Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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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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- 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
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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Abstract
本发明公开了一种铁矿全干式选别方法，包括以下步骤：将含铁原矿进行粗破、筛分，并将筛上产品进行中碎后与筛下产品一起进行磁滑轮干式预选，预选精矿再进行高压辊磨，预选尾矿作为沙石骨料；将辊磨后预选精矿打散后通过圆辊筛筛分，并将筛上产品进行一段磁滑轮干式预选，预选精矿返回高压辊磨给料端，预选尾矿也作为沙石骨料；圆辊筛筛下产品采用螺旋干式预选，螺旋干式预选尾矿作为粗尾矿，预选精矿进入加热风的立式干磨机中；干磨后产品用双磁场螺旋干式磁选机粗选，粗选中矿进行两段带式风磁精选，最终带式风磁精矿与粗选精矿一起组成综合精矿。本发明采用全干式选矿流程、工艺简单、低水耗、尾矿建材化利用率高、无需尾矿坝。
The invention discloses a method for all-dry sorting of iron ore. , the pre-selected concentrate is then subjected to high-pressure roller milling, and the pre-selected tailings are used as sand aggregate; the pre-selected concentrate after roller milling is broken up and then screened by a round roller screen, and the products on the screen are subjected to a magnetic pulley dry pre-selection, pre-selection The concentrate is returned to the feed end of the high-pressure roller mill, and the pre-selected tailings are also used as sand and gravel aggregates; the products under the round roller screen are pre-selected by a spiral dry type, and the pre-selected tailings are used as coarse tailings, and the pre-selected concentrate enters the heating air. In vertical dry mill; the product after dry grinding is roughened by double magnetic field spiral dry magnetic separator, and the rough beneficiation is carried out by two-stage belt-type wind-magnetic selection, and finally the belt-type wind-magnetic concentrate and rougher concentrate are composed together. Integrated concentrates. The invention adopts an all-dry beneficiation process, has the advantages of simple process, low water consumption, high utilization rate of tailings as building materials, and no need for tailings dams.
Description
Technical Field
The invention belongs to the technical field of mineral processing, relates to engineering mineral separation, and particularly relates to a full-dry type iron ore separation method.
Background
The raw ore grade of the iron ore resource in China is low, the ore embedding granularity is fine, and gangue minerals are more in impurity. At present, the separation of iron ore usually needs to crush the ore, ball mill the ore to the grain diameter less than 0.074mm and more than 60%, and then separate the iron ore concentrate by wet ore separation methods such as gravity separation, wet magnetic separation, flotation and the like.
The main problems in the prior art are as follows: the existing wet method has large steel consumption and water consumption on crushing and grinding, 0.8-1.5 kg of steel balls and lining plates are required to be consumed for treating each ton of ores averagely, and nearly 3t of water is required to be consumed for treating each 1t of ores by wet ore dressing, so that the method is a great problem in iron ore dressing in arid water-deficient areas. Secondly, the main treatment mode of the wet tailings in China is to stack the wet tailings in the tailings, so that the economic cost in the aspects of transportation, management and the like is increased for enterprises, the environment is damaged, a series of safety problems are caused, and the comprehensive utilization problem of the wet tailings needs to be solved urgently. In addition, the main iron ore dry separation technology in China is mainly used in the dry type pre-separation (tailing discarding) stage and cannot be applied to the full dry type separation of the iron ores.
Zhu national bin and the like (Zhu national bin, Meiguangjun, Kangan, Chengxian, Lihanan and the like), a certain ultra-lean magnetite separation plant applies high-pressure roller grinding-dry separation process effect research [ J ], a metal mine, 2018, 509 (11): 73-77) improves the concentrate grade by 2.18 percent through high-pressure roller grinding and suspension dry pre-separation and then is combined with a swirler group. However, suspension dry beneficiation is only pre-concentration, and only can achieve a primary enrichment effect, and a wet beneficiation process is still required to be matched for meeting the requirement of qualified magnetite concentrate.
The method comprises the steps of utilizing a dry grinding and dry separation method and device for magnetite, CN104815739A [ P ], 2015) to grind magnetite materials through a high-pressure roller, and then combining a dry magnetic separator and a wind power powder concentrator to obtain coarse concentrate suitable for wet magnetic separation. However, the device and the method still need to be combined with a wet beneficiation method to obtain qualified magnetite concentrate.
Schopper fly (Schopper fly, a magnetite roller milling dry separation method, CN102553709A [ P ], 2012) invented a method for separating dry refined powder by combining roller milling with three-stage dry separation machine. However, the method does not effectively recover magnetite in the tailings, so that magnetite resources are lost to a certain extent, and the process is not pre-selected, so that the treatment capacity is large during ore grinding and concentration.
Zhanren li et al (Zhanren li, Chen iron force, Wangxin, etc., a process for on-line closed-circuit rotary kiln roasting dry-grinding dry-separation of refractory iron ore, CN107377207A [ P ], 2017) invented a method for pre-separating refractory ore after rotary kiln magnetizing roasting by spiral dry pre-separation, dry-grinding pre-separated concentrate, then carrying out three-stage concentration by a flat-plate air-magnetic combined dry separator to obtain final concentrate, and returning the latter two-stage concentrated tailings to rotary kiln magnetizing roasting after spiral dry re-concentration. However, the method only carries out one-section pre-selection, so that the dry grinding quantity is higher, the mineral separation flow is not subjected to rough separation, the fine separation is directly carried out by a flat plate air-magnetic combined dry separator, the subsequent treatment quantity is increased, and the final tailings are not effectively utilized.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention provides the full-dry type iron ore sorting method, which can obtain qualified iron ore concentrate, has the advantages of full-dry type ore sorting in the whole process, no water consumption, simple process, low production cost and high utilization rate of tailing building materials, and is suitable for sorting magnetite in arid water-deficient areas.
Therefore, the invention adopts the following technical scheme:
a full-dry type iron ore sorting method comprises the following steps:
firstly, coarse crushing and screening iron-containing raw ore, and performing dry pre-selection on the materials on the screen and the materials under the screen through a first magnetic pulley after primary crushing;
step two, feeding the concentrate subjected to dry type preselection by the first magnetic pulley into a high-pressure roller mill for high-pressure roller milling, scattering materials subjected to roller milling, and feeding the scattered materials into a round roller screen; the tailings after dry pre-selection of the first magnetic pulley are used as sand aggregate;
performing preselection enrichment on the material sieved by the round roller screen through a first single magnetic field spiral dry magnetic separator, taking the preselected tailings as coarse tailings, and feeding spiral dry preselection concentrate into a vertical dry grinding machine;
step four, performing dry type pre-selection on the material on the round roller screen through a second magnetic pulley, wherein the pre-selected tailings are also used as sand aggregate, and the pre-selected concentrate returns to the feeding end of the high-pressure roller mill;
step five, hot air is added into the spiral dry type pre-concentration concentrate in a vertical dry grinding machine for dry grinding, and the dry ground material is sent into a double-magnetic-field spiral dry type magnetic separator for rough concentration;
and step six, performing two-stage concentration on the middlings through a belt type air magnetic dry separator, combining the concentrates after the two-stage concentration and the roughed concentrates to form comprehensive concentrates, combining tailings after the two-stage concentration and returning to a roughed feed end of the double-magnetic-field spiral dry magnetic separator, feeding roughed tailings into a second single-magnetic-field spiral dry magnetic separator for scavenging, returning scavenged concentrates to a concentrated feed end of the belt type air magnetic dry separator, and using scavenged tailings as fine tailings.
Preferably, in the step one, the medium-crushed material is mixed with the undersize material, and the granularity of the mixed material is-20 mm to-30 mm.
Preferably, in the second step, the iron content of the sand and stone aggregate is below 8-12%.
Preferably, in the third step, the distance between the round rollers of the round roller screen is 3 mm-8 mm; the iron content of the coarse tailings is below 6-8%.
Preferably, in the fourth step, the iron content of the sand and stone aggregate is below 5-10%.
Preferably, in the fifth step, after the material is subjected to hot air dry grinding by a vertical dry grinding machine, the final granularity of the material is controlled to be-0.074 mm and accounts for 50-85%, and the moisture of the material is controlled to be below 2-4%.
Preferably, in the sixth step, when the double-magnetic-field spiral dry magnetic separator is used for roughing, the magnetic field intensity of the first section is 2000 Gs-5500 Gs, the magnetic field intensity of the second section is 1000 Gs-3500 Gs, and the spiral rotation speed is 40-120 r/min.
Preferably, in the sixth step, the magnetic field intensity of the second single-magnetic-field spiral dry magnetic separator during sweeping is 2000 Gs-5000 Gs, and the spiral rotation speed is 40-120 r/min.
Preferably, in the sixth step, the magnetic field intensity of the belt type air magnetic dry separator is 1200Gs to 3500Gs during the first stage of concentration, the magnetic field intensity of the belt type air magnetic dry separator is 800Gs to 2500Gs during the second stage of concentration, the rotating speed of the belt is 0.2 to 1.5m/s, and the air supply quantity is 10000 to 50000m3/min。
Preferably, the sand and stone aggregate and the coarse tailings are directly used for building materials, and a tailing dam is not needed.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, through magnetic pulley preselection and spiral dry preselection after medium crushing and high-pressure roller grinding, a large amount of sand and stone aggregates are removed, the subsequent ore grinding and ore dressing treatment capacity is reduced, and the equipment maintenance and treatment cost is reduced.
(2) The invention utilizes the magnetic pulley preselection and the spiral dry preselection to throw away the sand aggregate before the fine grinding, and the sand aggregate can be applied to roadbed materials, concrete aggregates and the like in building materials, thereby not only solving the environmental problem caused by tailing stacking, but also increasing the economic income without building a tailing dam.
(3) According to the invention, the high-pressure roller mill and the vertical stirring mill are used in a matched manner, so that iron-containing minerals and gangue minerals are selectively dissociated, and the subsequent beneficiation efficiency is improved.
(4) According to the invention, the round roller screen is used for screening the scattered materials, so that the screening efficiency is improved, the ore return quantity is reduced, the processing pressure of the high-pressure roller mill is reduced, and the operation cost and the equipment maintenance cost are reduced to a certain extent.
(5) According to the invention, hot air is added during dry grinding of the vertical stirring mill, so that the moisture of the material is controlled to be below 2-4%, the material sorting efficiency is higher, and the operation cost and the equipment maintenance cost are reduced to a certain extent.
(6) The invention combines the rough concentration and scavenging of the spiral dry magnetic separator and the fine concentration of the belt type wind-magnetic combined magnetic separator, thereby not only improving the separation efficiency and obtaining the qualified magnetite concentrate, but also improving the recovery rate of iron in the tailings.
(7) According to the invention, a part of qualified concentrate is obtained in advance by using the double-magnetic-field spiral dry magnetic separator for roughing, so that the treatment capacity of the middling section fine selection after roughing is reduced, and the separation efficiency is improved.
(8) The invention improves the iron ore dry separation efficiency by using the double-magnetic-field spiral dry magnetic separator, the single-magnetic-field spiral dry magnetic separator and the belt type air magnetic dry magnetic separator to separate iron-containing minerals.
(9) The method can obtain qualified iron ore concentrate, and the whole process is full-dry ore dressing without water consumption, so that the method is suitable for the separation of magnetite in arid water-deficient areas.
(10) The invention has the advantages of full-dry type mineral separation flow, simple process, low production cost, low water consumption and high utilization rate of tailing building materials.
Drawings
Fig. 1 is a flow chart of a full-dry type iron ore sorting method provided by the invention.
Fig. 2 is a schematic structural diagram of equipment adopted in the iron ore full-dry type separation method provided by the invention.
Description of reference numerals: 1. a first magnetic pulley; 2. a high pressure roller mill; 3. a round roller screen; 4. a first single magnetic field spiral dry magnetic separator; 5. a vertical dry mill; 6. a double magnetic field spiral dry magnetic separator; 7. a belt type air magnetic dry separator; 8. a second magnetic pulley; 9. a second single magnetic field spiral dry magnetic separator.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are provided for illustration only and are not to be construed as limiting the invention.
Example one
As shown in fig. 1, the invention discloses a full dry type iron ore sorting method, the adopted equipment is shown in fig. 2, and the full dry type iron ore sorting method comprises a first magnetic pulley 1, a high pressure roller mill 2, a round roller screen 3, a first single magnetic field spiral dry type magnetic separator 4, a vertical dry mill 5, a double magnetic field spiral dry type magnetic separator 6, a belt type air magnetic dry separator 7, a second magnetic pulley 8 and a second single magnetic field spiral dry type magnetic separator 9, and the full dry type iron ore sorting method comprises the following steps:
firstly, coarse crushing and screening iron-containing raw ore, and performing dry pre-selection on the materials on the screen and the materials under the screen through a first magnetic pulley 1 after primary crushing;
step two, feeding the concentrate subjected to dry type preselection by the first magnetic pulley 1 into a high-pressure roller mill 2 for high-pressure roller milling, scattering materials subjected to roller milling, and feeding the scattered materials into a round roller screen 3; the tailings after dry pre-selection of the first magnetic pulley 1 are used as sand aggregate;
thirdly, performing preselection enrichment on the materials screened by the round roller screen 3 through a first single magnetic field spiral dry magnetic separator 4, taking the preselected tailings as coarse tailings, and feeding the spiral dry preselection concentrate into a vertical dry grinding machine 5;
step four, performing dry preselection on materials on the sieve of the round roller sieve 3 through a second magnetic pulley 8, wherein the preselected tailings are also used as sand aggregates, and the preselection concentrate returns to the feeding end of the high-pressure roller mill 2;
step five, hot air is added into the spiral dry type pre-concentration concentrate in a vertical dry grinding machine 5 for dry grinding, and the dry ground material is sent into a double-magnetic-field spiral dry type magnetic separator 6 for rough concentration;
and step six, performing two-stage concentration on the middlings through a belt type air magnetic dry separator 7, combining the concentrates after the two-stage concentration and the roughed concentrates into comprehensive concentrates, combining tailings after the two-stage concentration and returning to a roughed feed end of a double-magnetic-field spiral dry magnetic separator 6, feeding roughed tailings into a second single-magnetic-field spiral dry magnetic separator 9 for scavenging, returning scavenged concentrates to a concentrated feed end of the belt type air magnetic dry separator 7, and using scavenged tailings as fine tailings.
Specifically, in the step one, the medium-crushed material and the undersize material are mixed, and the granularity of the mixed material is-20 mm to-30 mm.
Specifically, in the second step, the iron content of the sand aggregate is below 8-12%.
Specifically, in the third step, the distance between the round rollers of the round roller sieve 3 is 3 mm-8 mm; the iron content of the coarse tailings is below 6-8%.
Specifically, in the fourth step, the iron content of the sand aggregate is below 5-10%.
In the fifth step, after the vertical dry grinding machine 5 is used for dry grinding by adding hot air, the final granularity of the material is controlled to be minus 0.074mm and accounts for 50-85%, and the moisture of the material is controlled to be below 2-4%.
Specifically, in the sixth step, when the double-magnetic-field spiral dry magnetic separator 6 is used for roughing, the magnetic field intensity of the first section is 2000 Gs-5500 Gs, the magnetic field intensity of the second section is 1000 Gs-3500 Gs, and the spiral rotation speed is 40-120 r/min.
Specifically, in the sixth step, the magnetic field intensity of the second single-magnetic-field spiral dry magnetic separator 9 is 2000Gs to 5000Gs during sweeping, and the spiral rotation speed is 40 r/min to 120 r/min.
Specifically, in the sixth step, the magnetic field intensity of the belt type air magnetic dry separator 7 is 1200 Gs-3500 Gs during the first stage of concentration, 800 Gs-2500 Gs during the second stage of concentration, the rotating speed of the belt is 0.2-1.5 m/s, and the air supply quantity is 10000-50000 m3/min。
Specifically, the sand aggregate and the coarse tailings are directly used as building materials, and a tailing dam is not needed.
Example two
The iron content of the adopted iron ore is 31.20 percent, the iron-containing minerals mainly comprise magnetite, limonite and hematite, and the granularity of the raw ore is more than 50 mm.
A full-dry type iron ore sorting method comprises the following specific implementation steps:
the method comprises the steps of firstly, roughly crushing, screening and medium crushing raw iron ores until the granularity reaches-20 mm, and preselecting the raw iron ores by a first magnetic pulley 1 with the magnetic field intensity of 3800Gs, wherein the content of iron in the removed sand and stone aggregates is 9.23%, and the yield is 18.24%.
Secondly, after the pre-selected concentrate is subjected to high-pressure roller grinding, the pre-selected concentrate passes through a circular roller screen 3 with the roller spacing of 6mm, products on the screen are pre-selected through a second magnetic pulley 8 with the magnetic field intensity of 3400Gs, the content of iron in the removed sand and stone aggregate is 7.32%, the yield is 4.31%, and the pre-selected concentrate of the second magnetic pulley 8 returns to the feeding end of the high-pressure roller grinder 2; the undersize product is pre-selected by a first single magnetic field spiral dry magnetic separator 4, the magnetic field intensity is 3200Gs, the rotating speed is 60 revolutions per minute, the content of iron in the thrown coarse tailings is 7.44 percent, and the yield is 11.23 percent.
Thirdly, carrying out vertical dry grinding on the single magnetic field spiral dry type pre-selected concentrate, introducing hot air for drying, finally grinding the concentrate until the grain size is minus 0.078mm and accounts for 78.34 percent, and after the moisture content is 0.45 percent, carrying out rough separation by a double magnetic field spiral dry type magnetic separator 6 with a first section of magnetic field intensity of 2500Gs and a second section of magnetic field intensity of 2000Gs at the rotating speed of 60 revolutions per minute; the roughing middlings are refined by two sections of belt type air magnetic dry separators 7, the magnetic field intensity of the first section is 2500Gs, the magnetic field intensity of the second section is 2200Gs, and the air supply quantity is 20000m3Min; the roughed tailings are scavenged by a section of second single magnetic field spiral dry magnetic separator 9, the magnetic field intensity is 3000Gs, and the rotating speed is 60 revolutions per minute.
The comprehensive iron ore concentrate grade obtained finally is 62.77%, and the recovery rate is 84.22%.
EXAMPLE III
The iron content of the adopted iron ore is 33.27 percent, the iron-containing minerals mainly comprise magnetite, specularite and hematite, and the granularity of the raw ore is more than 50 mm.
A full-dry type iron ore sorting method comprises the following specific implementation steps:
the method comprises the steps of firstly, roughly crushing, screening and crushing raw iron ores until the granularity reaches-25 mm, and preselecting the raw iron ores by a first magnetic pulley 1 with the magnetic field intensity of 3700Gs, wherein the content of iron in the removed sand and stone aggregates is 11.23%, and the yield is 16.24%.
Secondly, after the pre-selected concentrate is subjected to high-pressure roller grinding, the pre-selected concentrate passes through a round roller screen 3 with the roller spacing of 8mm, products on the screen are pre-selected through a second magnetic pulley 8 with the magnetic field intensity of 3500Gs, the content of iron in the removed sand and stone aggregate is 7.79%, the yield is 7.44%, and the pre-selected concentrate of the second magnetic pulley 8 returns to the feeding end of the high-pressure roller grinder 2; the undersize product is pre-selected by a first single magnetic field spiral dry magnetic separator 4, the magnetic field intensity is 3200Gs, the rotating speed is 60 revolutions per minute, the content of iron in the thrown coarse tailings is 44 percent, and the yield is 11.23 percent.
Thirdly, carrying out vertical dry grinding on the single magnetic field spiral dry type pre-selected concentrate, introducing hot air for drying, finally grinding the concentrate until the concentration of the concentrate is-0.078 mm, wherein the concentrate accounts for 82.11%, and the water content is 0.51%, and then roughly selecting the concentrate by a double magnetic field spiral dry type magnetic separator 6 with a first section of magnetic field intensity of 2000Gs and a second section of magnetic field intensity of 1200Gs at the rotating speed of 80 revolutions per minute; the roughing middlings are refined by two sections of belt type air magnetic dry separators 7, the magnetic field intensity of the first section is 1500Gs, the magnetic field intensity of the second section is 1200Gs, and the air supply quantity is 20000m3Min; and (3) carrying out scavenging on the roughed tailings by a section of second single-magnetic-field spiral magnetic separator 9, wherein the magnetic field intensity is 2200Gs, and the rotating speed is 60 revolutions per minute.
The grade of the obtained comprehensive iron ore concentrate is 65.11%, and the recovery rate is 82.84%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and scope of the present invention are intended to be covered thereby.
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| CN112264172A (en) * | 2020-09-24 | 2021-01-26 | 酒泉钢铁(集团)有限责任公司 | Process for producing iron ore concentrate by grading, dry grinding and dry separation of low-grade magnetite |
| CN112619895B (en) * | 2021-01-11 | 2023-12-22 | 包永鹏 | Air-magnetic dry separation device and magnetic bead recovery method for improving utilization rate of fly ash |
| CN113245031B (en) * | 2021-05-18 | 2022-10-28 | 中钢集团马鞍山矿山研究总院股份有限公司 | Process for scattering high-pressure roller grinding cakes |
| CN116273395B (en) * | 2023-03-08 | 2024-05-28 | 酒泉钢铁(集团)有限责任公司 | Production process for producing iron ore concentrate by multistage dry grinding and dry separation of iron ore |
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