CN110586315B - Full-dry type iron ore sorting method - Google Patents

Full-dry type iron ore sorting method Download PDF

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CN110586315B
CN110586315B CN201911017528.9A CN201911017528A CN110586315B CN 110586315 B CN110586315 B CN 110586315B CN 201911017528 A CN201911017528 A CN 201911017528A CN 110586315 B CN110586315 B CN 110586315B
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dry
magnetic
tailings
concentrate
spiral
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CN110586315A (en
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陈铁军
刘伟
周仙霖
万军营
罗艳红
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Wuhan University of Science and Engineering WUSE
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00General arrangement of separating plant, e.g. flow sheets

Abstract

The invention discloses a full-dry type iron ore sorting method, which comprises the following steps: carrying out coarse crushing and screening on iron-containing raw ores, carrying out magnetic pulley dry type pre-selection on products on the screen together with products under the screen after carrying out medium crushing on the products, carrying out high-pressure roller grinding on pre-selected concentrate, and using pre-selected tailings as gravel aggregate; the pre-selected concentrate after the roller milling is scattered and then screened by a round roller screen, the product on the screen is subjected to one-section magnetic pulley dry pre-selection, the pre-selected concentrate returns to the feeding end of the high-pressure roller milling, and the pre-selected tailings are also used as sand aggregate; adopting spiral dry pre-concentration on the product below the round roller screen, wherein the spiral dry pre-concentration tailings are used as coarse tailings, and the pre-concentration concentrate enters a vertical dry grinding machine with hot air; and (3) roughing the product after dry grinding by using a double-magnetic-field spiral dry magnetic separator, carrying out two-section belt type air magnetic concentration on the middlings in roughing, and finally forming comprehensive concentrate by using the belt type air magnetic concentrate and the roughing concentrate. The invention adopts a full-dry type mineral separation process, has simple process, low water consumption and high utilization rate of tailing building materials, and does not need a tailing dam.

Description

Full-dry type iron ore sorting method
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.

Claims (10)

1. A full-dry type iron ore sorting method is characterized in that: the 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.
2. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: in the first step, the medium crushed material is mixed with the undersize material, and the granularity of the mixed material is-30 mm.
3. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: in the second step, the iron content of the sand aggregate is below 12 percent.
4. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: 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 8 percent.
5. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: in the fourth step, the iron content of the sand and stone aggregate is below 10 percent.
6. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: and fifthly, after the materials are subjected to hot air dry grinding by a vertical dry grinding machine, the final granularity of the materials is controlled to be minus 0.074mm and accounts for 50% -85%, and the moisture of the materials is controlled to be below 4%.
7. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: in the sixth step, when the double-magnetic-field spiral dry-type 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.
8. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: in the sixth step, the magnetic field intensity of the second single magnetic field spiral dry-type magnetic separator during sweeping is 2000 Gs-5000 Gs, and the spiral rotation speed is 40-120 r/min.
9. The method for the full-dry beneficiation of iron ores according to claim 1, characterized in that: in the sixth step, the magnetic field intensity of the belt type air magnetic dry separator is 1200 Gs-3500 Gs during the first stage of concentration, the magnetic field intensity is 800 Gs-2500 Gs during the second stage of concentration, the rotating speed of a belt is 0.2-1.5 m/s, and the air supply quantity is 10000-50000 m3/min。
10. A method according to any one of claims 1 to 9, characterized in that: the sand and stone aggregate and the coarse tailings are directly used as building materials, and a tailing dam is not needed.
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