WO2016054707A1 - Procédé et système de traitement du minerai oxyde de fer totalement à sec au moyen d'une unité de séparation magnétique - Google Patents

Procédé et système de traitement du minerai oxyde de fer totalement à sec au moyen d'une unité de séparation magnétique Download PDF

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Publication number
WO2016054707A1
WO2016054707A1 PCT/BR2015/050150 BR2015050150W WO2016054707A1 WO 2016054707 A1 WO2016054707 A1 WO 2016054707A1 BR 2015050150 W BR2015050150 W BR 2015050150W WO 2016054707 A1 WO2016054707 A1 WO 2016054707A1
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Prior art keywords
magnetic
iron oxide
superfines
fraction
fines
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PCT/BR2015/050150
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English (en)
Portuguese (pt)
Inventor
Mauro FUMYO YAMAMOTO
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New Steel Soluções Sustentaveis S.A.
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Priority to SE1750569A priority Critical patent/SE1750569A1/sv
Priority to EA201790798A priority patent/EA201790798A1/ru
Priority to CA2963990A priority patent/CA2963990C/fr
Priority to AU2015330629A priority patent/AU2015330629B2/en
Publication of WO2016054707A1 publication Critical patent/WO2016054707A1/fr
Priority to NO20170616A priority patent/NO20170616A1/en

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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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/23—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp
    • B03C1/24—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields
    • B03C1/247—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • 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
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention is directed to a finely grained, finely ground iron ore beneficiation process and system below 150 microns on a fully dry route. Fine-grained and super-fine iron oxide minerals are found in tailings dams and tailings ores (DUMP) by existing plants.
  • said dump is ore useful for feeding a fully dry iron oxide ore beneficiation process and system through a magnetic separation unit.
  • the present invention aims to simplify the recovery process of the iron ores still contained in said tailings and dump, providing high recoveries, metallurgical and mass.
  • a commercially superior product more precisely, an iron oxide ore concentrate with a content above 63% Fe, with a simple adjustment can increase the final concentration of the concentrate, reaching levels of up to 67% Fe (T).
  • T 67% Fe
  • the innovative features of the dry process of the present invention advantageously meet the simultaneous economic, environmental and strategic demands of the mining industry by enabling the improved recovery of mineral tailings that pose a high risk of environmental impact and transform them. in technically and economically viable marketable products, as well as the possibility to take advantage of the low-grade iron ores that are currently rejected by existing plants.
  • large lakes will be formed, usually without economic use for this liability.
  • a large liability consisting of the presence of large lakes saturated with mineral sediments, due to the extraction of sand, without conditions to sustain any form of life. or for economic use.
  • BR patent application PI0103652-1 describes an iron oxide waste recovery process. This waste can be obtained directly from the fines recovery from metallurgical reduction processes as well as from the return deviation of fines from companies that supply iron ore to steel companies.
  • the material is loaded into a feed bin and runs through rails and belts to a rotary drying oven. The dried material is discharged into stock without any sorting / concentration process or is taken directly to the reduction furnaces by a belt system.
  • Document BR102012008340-0 discloses a system and process equally intended for the separation of fines and superfines, but which are unable to process ores that are considered as rejected ores (DUMP).
  • the separation unit disclosed herein was operationally unsuitable for mineral processing as high magnetic susceptibility (such as magnetite - FeOFe 20 3 ).
  • the feed control in the silos of the separation units of this system is done by varying the vibration intensity of the vibrating motor installed there, which does not always result in adequate material scalability in the separator.
  • the system and process disclosed herein do not permit immediate disposal of the separated non-magnetic fraction.
  • the state of the art has traditionally employed a rotary drum dryer.
  • the presence of fines in the dryer results in the formation of a significant amount (30 to 50%) of pellets within the dryer (which, of course, counteracts the goal of recovering fines), leading to a low efficiency of the pellet. equipment for coarse particles and an even greater inefficiency for fine particles, as the particles are not released, thus preventing the separation between iron oxide minerals and impurities.
  • Fluidized Bed Dryers are recommended for coarse particles that allow fluidized beds to form and for fine particles it is impossible to form fluidized beds.
  • Spray Dry widely used today in the ceramic industries to prepare pasta for the porcelain tile manufacturing process, however to be able to dry in Spray Dry it is necessary to form a pulp with 50% solids to promote the atomization of particles. to be injected against a hot air stream. For a 500 ton / h feed, you will need to add 500 m 3 more water which will make the operational cost unfeasible.
  • the high intensity magnetic roller separator as used has been shown to be inefficient. This inefficiency stems from the fact that during the magnetic separation process, non-magnetic particles are trapped by the magnetic particles, dragging the non-magnetic fraction to the magnetic fraction, preventing iron oxide concentrates above economically viable contents.
  • the present invention aims to provide a system and method for the dry recovery of fines and superfines of highly efficient iron oxide ore which does not have the environmental liability, more particularly in that tailings can be considered as a raw material for the construction and cement industry, and have deployment and operating costs that are perfectly permissible for the mining industry.
  • the present invention further aims to provide a magnetic separation unit which has satisfactory efficiency for materials traditionally not viable to be processed by magnetic separators by means of rare earth high intensity permanent magnet rollers (such as ferro-boron neodymium) and low intensity ferrite magnet rolls (such as iron boron).
  • rare earth high intensity permanent magnet rollers such as ferro-boron neodymium
  • low intensity ferrite magnet rolls such as iron boron
  • the present invention constitutes a definitive response to the challenge of generating economic results in an environmentally sustainable manner, characterized mainly by:
  • the uniqueness of the solution of the present invention lies in the adoption of a fully dry mineral processing route, which requires the introduction of a drying and disaggregating unit before feeding the finer fractions into a magnetic separator.
  • the route that forms the pillar of the present invention can be summarized as follows: ore moisture is reduced by a mechanical stirring dryer (using natural gas to prevent contamination or burning of biomass), which is then classified into various fractions by different stages of cycloning and, finally, magnetically separated into each of the classified ranges, with the important differential of being a fully developed dry process.
  • Figure 1 is a schematic diagram showing the benefit of tailings dam fines and / or dump.
  • Figure 2 is an operational process flowchart for tailings dam fines.
  • Figure 3 is an operational process flowchart for the use of dump by current wet plants in operation.
  • Figure 4 shows a mechanical stirring rapid dryer / mechanical stirring system used in the process and system of the present invention.
  • Figure 5 shows an arrangement of the cyclone assembly.
  • Figure 6 is a schematic of the magnetic separation unit according to the present invention.
  • Figure 7 is a side section representation of the magnetic separation unit according to the present invention.
  • Figures 8 to 12 are graphs depicting the particle size distribution of the different samples obtained in the example described in the text according to an exemplary embodiment of the present invention.
  • the removal of fine and super fine iron oxide is initiated by the extraction by a dredger 2 and pumping to the margin to drain excess water and form a pile for loading the material.
  • a dredger 2 the extraction of fine and super fine iron oxide is initiated by the extraction by a dredger 2 and pumping to the margin to drain excess water and form a pile for loading the material.
  • piles are formed along the tailing dam to separate the maximum water from the tailings, once the moisture content is around 6 to 8%, the tailings are collected by an excavator 3, and loaded onto a truck. bucket 4 for transport to silo or hopper 5.
  • the process is initiated by extraction by an excavator 3 that directly feeds a bucket truck 4 for transport to the silo or hopper 5.
  • the hopper or hopper discharge 5 is equipped with a belt finder 6 which feeds a sieve 7 for preliminary screening.
  • the screen 7 may consist, for example, of a vibrating screen for removal of contaminating material. This leads the material to a lung stack 8.
  • the capacity of said lung stack 8 can be defined according to the operational capacity of the plant.
  • a mist curtain may be provided around the hopper to prevent dust from escaping to the outside of the hopper.
  • the belt feeder can be completely enclosed, thus avoiding possible material losses and consequent dust emission to the atmosphere.
  • a duct may be provided comprising a vibrating feeder (not shown), which provides transfer of the ore to the belt feeder.
  • the material is then directed to the first of the three unit operations comprising the present invention, relating to the process and system for dry recovery of fine and super fine oxides of iron.
  • the first unitary operation consists of the fine particle drying / disaggregating operation.
  • the fine and super fine particle drying process is usually considered a technically complex operation, since the presence of other contaminating minerals such as clay minerals and iron hydroxide in the rotary drum drying process tends to form pellets, which is an aggregate of different minerals, thus preventing the possibility of carrying out the magnetic separation process.
  • the dryer 9 is composed of a heating chamber 10 which generates hot air (temperature around 850 ° C) inserted into the main body, within which two axes 9.1 are provided with a plurality of blades 9.2 which perform the movement of particulates both vertically and horizontally. These gases pass through a 9.5 maze system, which forces the heated air to come into contact with the material.
  • the vertical movement of particles in addition to promoting the contact of particles with hot air to increase the efficiency of the drying process also facilitates the removal of fines by the fines collection system promoted by the negative pressure exerted by the exhaust fan.
  • the dryer can be sized for a capacity of up to 600 t / h, and for larger capacities simply add drying modules. Based on the characteristics of the material to be dried, the dryer may have, for example, an ability to dry, disintegrate and at the same time remove fines, wherein the material to be fed into the dryer is less than 100 mesh (about 150 microns) can reach about 98% of the total.
  • [0067] It is equipped by two axes, driven by properly sized electric motor.
  • the axles are equipped with a plurality of paddles in different positions, namely material that moves the material forward, straight blades to propel the material up and feed inclined blades that tend to slow or control the speed of the material within the dryer.
  • Locking valves both in the feed and discharge fraction> 100 mesh, these locking valves tend to prevent cold air from entering the system, as well as hot gas outlet, while maintaining hot gas temperature performance, that is, providing thermal balance optimization;
  • thermocouples and pyrometers Cold air inlet valves to balance temperature measured with thermocouples and pyrometers. These temperatures can be displayed and controlled on a control panel.
  • a support structure for the cyclones is provided.
  • dryer 9 In the drying process, dryer 9 needs to operate with a depression to remove the water vapors obtained in the drying process. Therefore the dryer must be coupled to an exhaust system. In this process of removing water vapors, fines of less than 150 microns are also entrained by the exhaust system. For this reason, the exhaust system consists of different cycloning stages and a final collection system near bag filters 22 to avoid any particulate emission into the atmosphere.
  • natural gas and / or biomass is used, which together with proper air flow control, in a correct air / fuel ratio, provides clean and complete combustion, having as exhaust gas after passing through bag filters 22.
  • the process of removal of gases, water vapor and fines is carried out by a high capacity exhaust fan arranged at the end of the circuit.
  • a high capacity exhaust fan arranged at the end of the circuit.
  • a component that integrates the dryer with the so-called second unit operation of the process of the present invention consists of a series of cyclones in series, properly dimensioned with adequate pressure losses to make the separation by different grit sizes.
  • the second unitary step of this inventive process is to provide a set of serially arranged cyclones, each of which is sized to separate a grain size range, grain size ranges are defined according to release of iron oxide ore with its associated interfering minerals.
  • the number of cyclones can be scaled from one to six units, depending on the grading ranges to be processed. Cyclones are equipment commonly used to collect fines with particle sizes above 10 microns, precisely to decrease the fines load on bag filters 22. However, to be able to collect particles in different particle size ranges, it is Resize the cyclone to capture to the desired particle size. In this sense, cyclones can efficiently collect 100% of particles above 10 microns.
  • each of the serially arranged cyclones 11, 14 and 14 are then intended for respective cooling columns 12, 15 and 18 which are intended to lower the temperature which is between 70 ° C to 100 ° C. to a temperature around 40 ° C. This cooling is necessary to preserve the magnetic intensity of rare earth magnets (ferro-boron neodymium).
  • magnetic separation comprises the step following unitary invention of the present invention.
  • the products of each of the cyclones 11, 14 and 17, which successively supply the cooling columns 12, 15 and 18, classified in different grading ranges, are intended for their respective sets.
  • this configuration depends mainly on the separability characteristics of the iron oxide minerals present.
  • the respective high-intensity rare earth magnet (ferro-boron-neodymium) magnetic roll separators will be fed with the appropriate speed adjustments, as well as the positioning of spiits, which will be discussed below.
  • FIG. 6 the magnetic separation scheme with three cascading rollers is shown.
  • material from the first cyclone 11 and first cooling column 12 feeds a first magnetic roller, which may be low and / or high intensity, generating a first non-magnetic fraction that A first magnetic fraction, consisting of a final product with a content above 64% Fe (T), and a first mixed fraction that feeds a second high intensity magnetic roller should be discarded immediately.
  • the second magnetic roll generates a second non-magnetic fraction that is also discarded, and a second magnetic fraction with content above 64% Fe (T), in addition to a second mixed fraction that will feed the third magnetic roll.
  • the third magnetic roller generates a third equally discarded non-magnetic fraction, a third magnetic fraction with content above 64% Fe (T) and a third mixed fraction that is discarded along with the third non-magnetic fraction.
  • the product of the second cyclone will feed a cooling column and then the second magnetic separation unit 16, in the same sequencing, as in the first magnetic separation unit, feeds the first magnetic roller, which can be low and / or high intensity, generating a first non-magnetic fraction to be discarded immediately, a first magnetic fraction consisting of a final product with a content above 64% Fe (T), and a first mixed fraction which feeds a second high intensity magnetic roller.
  • the second magnetic roll generates a second non-magnetic fraction that is also discarded, and a second magnetic fraction with content above 64% Fe (T), in addition to a second mixed fraction that will feed the third magnetic roll.
  • the third magnetic roller generates a third equally discarded non-magnetic fraction, a third magnetic fraction with content above 64% Fe (T) and a third mixed fraction that is discarded along with the third non-magnetic fraction. Similarly, it will happen in the third magnetic separation unit 19.
  • the three-cascade magnetic separation scheme is shown, with the first magnetic roller being either low intensity or high intensity. Due to the characteristics of the material to be separated, the use of low intensity magnetic roller may be preferred, given the fact that permanent magnets are made from boron iron, with magnetic intensity ranging from 500 to 3000 Gauss. and are therefore intended for the separation of minerals of high magnetic susceptibility (such as magnetite - FeOFe 2 0 3 ). In the case of high intensity magnetic rollers, permanent magnets are made of ferro-boron neodymium, with magnetic intensities varying between 7,500 and 13,000 G, for the separation of minerals of low magnetic susceptibility (such as hematite and ferro-limonite hydroxides).
  • FIG 7 which is a representation of a side section of the magnetic separation unit, all the elements of the cascade magnetic separation unit, which in the exemplified case, have three rollers, one overlapped, are illustrated in detail. .
  • each of the cyclones feeds a respective set of magnetic separators 13, 16 and 19.
  • the set consists of a receiver silo 30, in which the feed for the assembly may alternatively be controlled by the vibration intensity of a geared motor (not shown as discussed below).
  • silo 30 is configured with inclination angles that provide better material flowability for the magnetic separator assembly.
  • the material is then discharged to a PU coated polyester strap 34, the strap is tensioned by a first low intensity magnetic ferrite (ferro-boron) magnet roll 32 and a support roller 33.
  • a first low intensity magnetic ferrite (ferro-boron) magnet roll 32 and a support roller 33 The material is then discharged to a PU coated polyester strap 34, the strap is tensioned by a first low intensity magnetic ferrite (ferro-boron) magnet roll 32 and a support roller 33.
  • Magnetic separation control is performed by varying the speed of the magnetic roller and by positioning the splits.
  • Divider 36 separates the non-magnetic fraction from the mixed fraction and divider 37 separates the mixed fraction from the magnetic fraction.
  • the first non-magnetic fraction is collected by trough 38, the first mixed fraction is collected by trough 39 and the first magnetic fraction is collected by trough 40.
  • the first mixed fraction trough feeds silo 41 of the second high-intensity magnetic roll.
  • the second high-intensity magnetic roll of rare earth magnets (ferro-boro neodymium) 42 after magnetic separation generates a second non-magnetic fraction which will be discarded through of the trough 43, the second magnetic fraction is discarded on trough 45 and a second mixed trough fraction 44 that feeds the third high intensity magnetic roller 47 of rare earth magnets (ferro-boron-neodymium) through trough item 44 by means of silo 46.
  • the third high-intensity magnetic roll 47 of rare earth magnets (ferro-boron neodymium) 46 after magnetic separation generates a third non-magnetic fraction that will be discarded through track 48, a third magnetic fraction that will be discarded. 50 in the pipeline 3 and a mixed fraction that through the chute 49, is discharged together with other non - magnetic fractions.
  • Item 51 in the three magnetic separation units comprises support rollers for the PU coated polyester belt 34.
  • the low and high intensity magnetic rollers are inclined, where the inclination angle can vary from 5 o to 55 °, with an ideal working range from 15 ° to 25 °, where the inclination is defined according to iron oxide release particle size. This slope, by the tests already performed, increases the separation efficiency of the magnetic fraction from the non-magnetic fraction.
  • the high intensity permanent magnet high-intensity magnetic roller is preferably constructed of super-powerful, temperature-resistant neodymium magnets up to 60 ° C and a high magnetic permeability steel disc;
  • the drive of the magnetic roller can be done by means of a 2.0 hp AC motor with variable speed and frequency inverter (not shown).
  • a belt tensioning and alignment system 50 is provided to prevent problems related to the short distance between small diameter belt rolls. Thus, the belt can be replaced within minutes without the need for special tools.
  • the guide systems used on each of the magnetic rollers allow the tensioning and alignment of the respective belts, thereby increasing their service life;
  • a vibratory drive silo feed system may have a 2.0 hp, 220 VAC, three-phase, and frequency inverter configuration for feed rate regulation. Includes storage silo; This type of feeder allows a controlled and uniform feeding.
  • a support structure constructed of carbon steel profiles with their finishing paint to provide an assembly characterized by a compact and easy to install unit.
  • An entirely dustproof control panel (not shown) may also be provided, including measuring instruments, speed controllers, frequency inverters, supply voltage: 220 VAC, 60 Hz, three phase.
  • the ore sample from the tailings pile presented an extremely simple mineralogy consisting essentially of iron bearing minerals and a non-magnetic fraction.
  • the iron-bearing minerals of the sample collected consisted of hematite and iron oxides and hydroxides, as below.
  • the non-magnetic fraction is essentially composed of silica and a small amount of kaolinite clay. The percentage of these minerals is shown in table 1 below.
  • the tailings sample After being subjected to the characterization tests, the tailings sample has an iron content of 33,62% Fe (T), the result of which can be seen in Table 2 below.
  • the second cyclone sample has the following distribution: 80% (d80) of mass is less than 55 microns, with a median (d50) of 29 microns and 20% (d20) of weight is less than 12 microns. These values can be seen in the graph of figure 8.
  • the tailings sample was submitted to the aeroclassification step in a pilot plant, in which the system consists of three serially arranged cyclones, bag filters and centrifugal exhaust. During the operation, samples were collected from each of the three cyclones and bag filters and subjected to a particle size analysis, which presented the following results.
  • the particle size distribution of the first cyclone is shown in table 4.
  • the first cyclone sample had the following distribution: 80% (d80) mass less than 75 microns, with a median (d50) of 47 microns and 20% (d20) of weight less than 25 microns. These values can be viewed in the graph of figure 9.
  • the second cyclone sample has the following distribution: 80% (d80) mass less than 39 microns, with a median (d50) of 25 microns and 20% (d20) of weight less than 13 microns. These values can be observed in the graph of figure 10.
  • the third cyclone sample has the following distribution: 80% (d80) of mass less than 27 microns, with a median (d50) of 16 microns and 20% (d20) of weight less than 8 microns. These values can be seen in the graph in figure 1 1.
  • the sleeve filter sample has the following distribution: 80% (d80) of mass less than 13 microns, with a median (d50) of 5 microns and 20% (d20) of weight less than 1 micron. These values can be seen in the graph of figure 12.
  • the first cyclone has a retention of 52.3% by weight, with a content of 34.67% Fe (T) and 53.96% of the contained iron.
  • the second cyclone with 22,6% by weight, with a content of 33,23% of Fe (T) that corresponds to 22,35% of contained iron.
  • the third cyclone has a retention of 16.2% by weight, with a content of 31.64% of iron representing 15.25% of the contained iron.
  • the bag filters retained 8.9% by weight, with a content of 32.05 Fe (T) and representing 8.53% of the non-recoverable iron.
  • the second magnetic roll silo 39 feeds the second high intensity magnetic rare earth magnet roll 40, which in turn generates a second non-magnetic fraction that is collected and removed from the magnetic separation unit through the collecting chute 41, and a second magnetic fraction that is collected at trough 42, in addition to a second mixed fraction that is collected through trough 44, which is incorporated together with the second non-magnetic fraction.
  • composition of the final metallurgical balance composing the magnetic fractions of the first rollers plus the magnetic fractions of the second rollers, is shown in table 11 below.

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Abstract

La présente invention concerne un système et un procédé de traitement à sec de fines et superfines du minerai oxyde de fer présent dans les barrages de rejets et les minerais rejetés pauvres, comprenant un dispositif de séchage (9) à injection d'air chaud avec moyens d'agitation mécanique et axes pourvus d'aubes (9.2) pour la désagrégation et la mise en mouvement de la matière dans les directions horizontale et verticale, un ensemble de classificateurs pneumatiques raccordé fonctionnel à la sortie du dispositif de séchage, exécutant une classification des minerais de fer fins et superfins dans des plages granulométriques prédéterminées, et des séparateurs magnétiques (13, 16, 19) à rouleaux magnétiques (32, 42, 47) disposés en cascade, formés par des aimants de terres rares à faible et/ou haute intensité magnétique, les rouleaux magnétiques étant disposés selon un angle d'inclinaison déterminé.
PCT/BR2015/050150 2014-10-10 2015-09-14 Procédé et système de traitement du minerai oxyde de fer totalement à sec au moyen d'une unité de séparation magnétique WO2016054707A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
SE1750569A SE1750569A1 (en) 2014-10-10 2015-09-14 Method and system for total dry refining of iron oxide ore through a magnetic separation unit
EA201790798A EA201790798A1 (ru) 2014-10-10 2015-09-14 Способ и система для полностью сухого обогащения руды при помощи блока магнитной сепарации
CA2963990A CA2963990C (fr) 2014-10-10 2015-09-14 Procede et systeme de traitement du minerai oxyde de fer totalement a sec au moyen d'une unite de separation magnetique
AU2015330629A AU2015330629B2 (en) 2014-10-10 2015-09-14 Process and system for dry improvement of iron-oxide-ore fines and superfines through a magnetic separation unit
NO20170616A NO20170616A1 (en) 2014-10-10 2017-04-11 Method and system for total dry refining of iron oxide ore through a magnetic separation unit

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CN109622231A (zh) * 2018-11-26 2019-04-16 中国矿业大学 一种预分级强化带电的摩擦电选分选装置与方法
CN113145856A (zh) * 2021-03-15 2021-07-23 西安交通大学 一种铁氧化产物分离、还原、还原产物储运的系统及方法
US11247214B2 (en) 2017-02-28 2022-02-15 Cidra Corporate Services Llc High intensity conditioning prior to enhanced mineral separation process

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CN105312233B (zh) * 2015-10-08 2017-05-31 烟台鹏程环保科技有限责任公司 一种矿产品加工装置
CA3240408A1 (fr) * 2022-03-30 2023-10-05 Benito Barbabela E Silva Systeme et procede de concentration magnetique a sec de concentres fins de minerai de fer

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GB768018A (en) * 1954-04-09 1957-02-13 Horace Freeman Improvements in or relating to the reduction of iron oxide
BRPI0803327A2 (pt) * 2008-06-19 2010-03-02 Jose Pancracio Ribeiro processo de concentraÇço de minÉrio de ferro por separaÇço magnÉtica com baixo consumo de Água e pouca geraÇço de lama de rejeito
WO2013138889A1 (fr) * 2012-03-19 2013-09-26 New Steel Solucöes Sustentaveis S.A. Procédé et système de récupération par voie sèche de fines et de superfines de minerai de fer et unité de séparation magnétique

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GB768018A (en) * 1954-04-09 1957-02-13 Horace Freeman Improvements in or relating to the reduction of iron oxide
BRPI0803327A2 (pt) * 2008-06-19 2010-03-02 Jose Pancracio Ribeiro processo de concentraÇço de minÉrio de ferro por separaÇço magnÉtica com baixo consumo de Água e pouca geraÇço de lama de rejeito
WO2013138889A1 (fr) * 2012-03-19 2013-09-26 New Steel Solucöes Sustentaveis S.A. Procédé et système de récupération par voie sèche de fines et de superfines de minerai de fer et unité de séparation magnétique

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Publication number Priority date Publication date Assignee Title
US11247214B2 (en) 2017-02-28 2022-02-15 Cidra Corporate Services Llc High intensity conditioning prior to enhanced mineral separation process
CN109622231A (zh) * 2018-11-26 2019-04-16 中国矿业大学 一种预分级强化带电的摩擦电选分选装置与方法
CN113145856A (zh) * 2021-03-15 2021-07-23 西安交通大学 一种铁氧化产物分离、还原、还原产物储运的系统及方法

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CA2963990C (fr) 2022-03-29
SE1750569A1 (en) 2017-05-09
BR102014025420A2 (pt) 2015-05-05
PE20170820A1 (es) 2017-07-04
EA201790798A1 (ru) 2017-08-31
CL2017000859A1 (es) 2017-09-29
BR102014025420B1 (pt) 2016-04-05
BR102014025420B8 (pt) 2016-04-19
AU2015330629B2 (en) 2021-03-25

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