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WO2000053818A1 - Dispositif de separation combine constitue d'un dispositif de refroidissement a tambour rotatif et d'un separateur magnetique stationnaire - Google Patents

Dispositif de separation combine constitue d'un dispositif de refroidissement a tambour rotatif et d'un separateur magnetique stationnaire Download PDF

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Publication number
WO2000053818A1
WO2000053818A1 PCT/US2000/005114 US0005114W WO0053818A1 WO 2000053818 A1 WO2000053818 A1 WO 2000053818A1 US 0005114 W US0005114 W US 0005114W WO 0053818 A1 WO0053818 A1 WO 0053818A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
product stream
separating drum
magnetic material
shell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/005114
Other languages
English (en)
Inventor
David W. Rierson
Philip H. Straub
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metso Outotec USA Inc
Original Assignee
Svedala Industries Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Svedala Industries Inc filed Critical Svedala Industries Inc
Priority to AU33840/00A priority Critical patent/AU3384000A/en
Publication of WO2000053818A1 publication Critical patent/WO2000053818A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B03C1/14—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with non-movable magnets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/26—Cooling of roasted, sintered, or agglomerated ores
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/383—Cooling devices for the charge
    • F27B7/386—Rotary-drum cooler
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/028—Cooling with means to convey the charge comprising a rotary drum

Definitions

  • the present invention relates to the conversion of iron-ore pellets or lumps into metallic iron suitable as feed material for making steel. More specifically, the present invention relates to a combined cooling device and magnetic separator useful in the production of direct reduced iron (DRI).
  • DRI direct reduced iron
  • Direct reduction of iron from iron-ore involves heating the ore to elevated temperatures substantially exceeding the Curie temperature of iron, which is approximately between 700° C and 800°C. At such elevated temperatures, and under the influence of a reducing atmosphere, the ferrous component of the ore is reduced into high-grade metallic iron pellets or lumps that are suitable as feed material for electric furnaces for making steel.
  • Hot briquetting is a proven technology and is a system that is used in combination with the direct reduction process. Typically, hot briquetting is used only with natural gas-based direct reduction processes, and not with direct reduction processes using lump coal as a fuel for reduction and heating. Gas-based direct reduction processes produce a DRI product that does not include any discrete pieces of gangue or undesirable solids in the product stream.
  • the product of gas-based direct reduction processes is, therefore, well-suited for hot briquetting at elevated temperatures (600°C to 700°C) since the gas-based procedure does not simultaneously encapsulate the undesirable gangue materials inside the briquette along with the DRI.
  • the iron-ore is typically reduced in a rotary kiln and a portion of the coal-based direct reduction process product stream includes unbumed carbon and ash from the virgin coal feed. All of the carbon from the coal feed and its attendant ash is not entirely consumed in the coal-based direct reduction process.
  • the unbumed coal, or char dilutes the quality of the DRI unless the char is removed from the product stream. If it is desired to hot briquette the product produced by coal-based direct reduction or if it is desired to hot charge the DRI directly into an electric arc furnace for downstream steel making, the char should be removed from the product stream prior to subsequent processing.
  • One method for removing the char from the product stream is to use a magnetic separator to remove the magnetic DRI from the non-magnetic char in the product stream.
  • the product stream must be substantially cooled by an industrial cooler to a temperature that allows the product stream to be handled with standard rubber conveyor belting and/or other types of material handling means.
  • the DRI product stream is cooled by the cooler to a temperature in the range of 100°C to
  • the present invention is a combined cooling device and magnetic separator for cooling a product stream and removing a desired magnetic metal material from the product stream.
  • the combined cooling device and magnetic separator of the invention includes a rotating separating drum that extends between an infeed end and a discharge end.
  • the separating drum is generally defined by a cylindrical shell.
  • a heated product stream is received at the infeed end of the separating drum and proceeds through the separating drum to the discharge end.
  • the temperature of the product stream at the infeed end of the separating drum is above the Curie temperature for the metallic material contained in the product stream, such that the metallic material in the product stream is non-magnetic at the infeed end.
  • a coolant distribution system is positioned to indirectly cool the product stream as the product stream travels downstream through the separating drum.
  • the coolant distribution system distributes a supply of coolant over the shell of the separating drum.
  • the shell of the separating drum conducts heat from the product stream to the coolant, such that the coolant can remove heat from the product stream.
  • the coolant reduces the temperature of the product stream below the Curie temperature of the metallic material to be removed, such that the metallic material in the product stream becomes magnetic.
  • a magnetic member is positioned in a spaced relationship to the outer shell near the discharge end of the separating drum such that the magnetic member can pull the metallic material from the product stream.
  • the magnetic member is a magnetic yoke having an arcuate shape that extends around at least a portion of the circumference of the separating drum.
  • the magnetic yoke pulls the magnetic material from the product stream into contact with the inner circumferential surface of the shell.
  • the magnetic metallic material rotates past the first end of the magnetic yoke, the magnetic material leaves the influence of the magnetic yoke and falls into a collecting device.
  • the collecting device is positioned below the first end of the magnetic yoke such that the magnetic material falls into the collecting device.
  • the collecting device is an inclined collection bin that directs the collected magnetic material out of the separating drum for downstream processing. The portion of the product stream containing non-magnetic material leaves the discharge end of the separating drum and is processed downstream accordingly.
  • Fig. 1 is a schematic illustration of an iron-ore direct reduction processing system including a combined cooling device and magnetic separator of the present invention
  • Fig. 2 is a perspective view of the combined cooling device and magnetic separator of the present invention
  • Fig. 3 is a partial section view taken along line 3-3 of Fig. 2 illustrating the magnetic separation of direct reduced iron
  • Fig. 4 is a section view taken along line 4-4 of Fig. 3 illustrating the magnetic separation of direct reduced iron in accordance with the present invention.
  • Fig. 1 illustrates a direct reduction system 10 used to process a wide variety of lump ores or pellets to produce a uniform, direct reduced iron (DRI), or sponge iron.
  • the direct reduction system 10 generally receives a supply of ore from a traveling grate 12.
  • the iron-containing ore is combined with a supply of coal 13 as it enters into a rotary kiln 16.
  • the iron-ore and coal are continuously fed into upstream end 18 of the rotary kiln 16 and are conveyed through the rotary kiln 16 while the ore is thermochemically reduced.
  • a combination air fan 17 and start-up burner 19 starts a cold reduction system. Once the system reaches the processing temperature, the use of the burner 19 is discontinued.
  • the rotary kiln 16 includes an air supply means 20 that supplies overbed air into the rotary kiln 16 to further support combustion within the kiln, and maintain the desired processing temperature.
  • a product stream of metalized iron and coal ash, or char exits downstream end 22 of the rotary kiln 16 and enters into a discharge housing 24.
  • the product stream leaving the rotary kiln 16 is discharged into the discharge housing 24 at a temperature typically greater than 1000°C. At this temperature, the DRI contained in the product stream is nonmagnetic, since the temperature of the product stream is above the Curie temperature for the directly reduced iron.
  • a combined cooling device and magnetic separator 26 receives the heated product stream from the discharge housing 24.
  • the combined cooling device and magnetic separator 26 includes a coolant distribution system 28 that cools the product stream within the cooling device and magnetic separator 26 to a temperature below the Curie temperature of the DRI.
  • the product stream is cooled to between approximately 700°C and 800°C. At this temperature, the DRI within the product stream becomes magnetic.
  • a magnetic member 30 separates the DRI from the non-magnetic material within the product stream. The separated hot DRI can then be processed downstream as required, while the non-magnetic material can be discarded or further processed as required.
  • Fig. 2 further illustrates the combined cooling device and magnetic separator 26 of the present invention.
  • the combined cooling device and magnetic separator 26 generally includes a separating drum 32 extending along a slightly inclined longitudinal axis 33 (Fig. 3) between an infeed end 34 and a discharge end 36.
  • the separating drum 32 is defined by a generally cylindrical shell 38 that defines a hollow, open interior 40, as shown in Figs. 3 and 4.
  • the cylindrical shell 38 is formed from unlined steel and has a length and a diameter designed to accommodate a specific throughput and achieving the appropriate amount of product cooling.
  • the separating drum 32 slopes downwardly from the infeed end 34 to the discharge end 36.
  • the force of gravity urges the product stream received at the infeed end 34 from the discharge housing 24 to flow through the separating drum 32 from the infeed end 34 to the discharge end 36.
  • the separating drum 32 rotates (shown counter-clockwise) about its longitudinal axis 33, as illustrated by arrows 42 in Figs. 2 and 4. The combination of the slope of the separating drum 32 and the rotation of the separating drum 32 urges the product stream to move from the infeed end 34 to the discharge end 36.
  • the product stream entering the separating drum 32 at the infeed end 34 is at an elevated temperature above the Curie temperature for DRI.
  • the product stream entering through the infeed end 34 is typically at a temperature of greater than 1000°C.
  • the coolant distribution system 28 operates to cool the product stream below the Curie temperature.
  • the coolant distribution system 28 generally includes a supply tube 44 connected to a supply of coolant. Coolant, such as water, passes from the supply tube 44 into a distribution tube 46 that generally extends axially above the separating drum 32.
  • the distribution tube 46 includes a plurality of openings 48 spaced along the length of the distribution tube 46 that allows the coolant to be distributed onto exterior surface 50 of shell 38. In this manner, the coolant wets the outer surface of shell 38 of the separating drum 32.
  • the product stream passes through the separating drum 32, the product stream is cooled by conduction of heat through shell 38 of the separating drum 32.
  • the shell 38 is formed from unlined steel such that heat can easily be conducted through the shell 38.
  • each collection trough 52 includes a sloped inner surface 53 and a drainpipe 54 that directs the coolant to a cooling tower or heat exchanger in which the heat can be removed from the coolant.
  • the coolant is again recirculated through the supply tube 44 and distribution tube 46 and applied to shell 38.
  • the temperature of the product stream when it reaches the discharge end 36 can be controlled by the flow rate of the coolant through the distribution tube 46 and the rotational speed of the separating drum 32. For example, increasing the rotational speed of the separating drum 32 decreases the amount of time the product stream is within the separating drum 32, thus increasing the temperature at the discharge end 36. Likewise, increasing the flow rate of the coolant increases the amount of heat removed from the product stream, thus decreasing the temperature at the discharge end 36.
  • the combined cooling device and magnetic separator 26 functions to reduce the temperature of the product stream to a temperature below the Curie temperature of DRI (approximately 700°C to 800°C) when the product stream nears the discharge end 36.
  • the magnetic member 30 positioned near the discharge end 36 of the separating drum 32 functions to separate the magnetic DRI 54 from the non-magnetic materials contained within product stream 56.
  • the magnetic member 30 is a stationary magnetic yoke 58 having a generally arcuate shape.
  • the magnetic yoke 58 includes an arcuate inner surface 59 spaced from shell 38 of the rotating separating drum 32.
  • the arcuate inner surface 59 of the magnetic yoke 58 is spaced such that the strength of the magnetic field has an influence on the magnetic material contained in the separating drum 32. This distance may vary depending on the strength of the magnetic yoke 58.
  • the magnetic yoke 58 is formed from a permanent magnet, although an electromagnet is contemplated as being an alternate embodiment of the invention. As can be seen in Fig. 4, the magnetic yoke 58 has an arcuate shape extending between a first end 60 and a second end 62. The magnetic yoke 58 extends around less than half of the outer circumference of shell 38.
  • the first end 60 of the magnetic yoke 58 is spaced in a clockwise direction (in the example illustrated) from the a vertical plane 63 that extends through the longitudinal axis of rotation 33 for the separating drum 32.
  • the first end 60 of the magnetic yoke 58 is spaced between 10 and 25 degrees from the vertical plane 63. It should be understood that if the separating drum 32 rotates in the opposite, clockwise direction, the first end 60 would then be spaced from the vertical plane 63 in the counterclockwise direction.
  • the product stream 56 rotates past the second end 62 of the magnetic yoke 58.
  • the magnetic yoke 58 pulls any magnetic material 54 in the product stream 56 into contact with the inner circumferential surface 64 of shell 38. Since the temperature of the product stream 56 near the discharge end 36 of the separating drum 32 has been cooled below the Curie temperature of DRI, the DRI 54 becomes magnetic and is attracted by the magnetic yoke 58.
  • the magnetic yoke 58 holds the DRI 54 in contact with the inner circumferential surface 64, while the non-magnetic material remains in the bottom of the separating drum 32. In this manner, the combination of the rotating separating drum 32 and magnetic yoke 58 lift the DRI 54 out of the product stream 56.
  • the DRI 54 reaches the first end 60 of the stationary magnetic yoke 58. Since the magnetic yoke 58 terminates at the first end 60, the magnetic influence of the magnetic yoke 58 is terminated when the DRI 54 rotates past the first end 60. After rotating past the first end 60, the DRI 54 drops from the inner circumferential surface 64 into a collecting device 66.
  • the collecting device 66 is a collection bin 68 having a back wall 70 spaced axially inward from the magnetic yoke 58.
  • the collection bin 68 includes an inclined bottom wall 72 that is connected to a discharge chute 74.
  • the discharge chute 74 directs the collected DRI 54 out of the separating drum 32 for downstream processing, as required.
  • the outer wall 75 of the collection bin 68 extends past the vertical plane 63 to insure that the separated DRI is collected, since the rotational inertia of the DRI 54 may carry the DRI 54 past the vertical plane 63.
  • the heavy DRI 54 falls almost immediately from the inner circumferential surface 64 after passing the first end 60 or the magnetic yoke 58. The non-magnetic materials remaining in the product stream 56 after the
  • DRI 54 has been removed by the magnetic member 30 discharge out of the end of the separating drum 32 into a separate handling system for subsequent disposition.
  • DRI can be removed from the product .
  • the DRI can be processed downstream. Since the temperature of the DRI as it is removed from the product stream is at a relatively high temperature, downstream processing can take place without injecting substantial additional heat into the DRI.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

L'invention se rapporte à un dispositif combiné, utile dans la production de fer de réduction directe, constitué d'un dispositif de refroidissement et d'un séparateur magnétique, conçu pour refroidir un courant de produit chauffé et pour extraire une matière magnétique dudit courant de produit. Le dispositif combiné comporte un tambour de séparation (32) incliné, rotatif, qui reçoit le courant de produit chauffé à une température supérieure à la température de Curie de la matière magnétique contenue dans le courant de produit. Un système de distribution de fluide caloporteur (28) refroidit le courant de produit jusqu'à une température inférieure à la température de Curie de la matière magnétique. Un étrier magnétique (58), qui est disposé autour d'une partie du tambour de séparation magnétique, retire la matière magnétique du courant de produit. Ladite matière magnétique est recueillie dans un dispositif collecteur (66) qui éloigne la matière magnétique de la matière non magnétique contenue dans le courant de produit.
PCT/US2000/005114 1999-03-08 2000-02-29 Dispositif de separation combine constitue d'un dispositif de refroidissement a tambour rotatif et d'un separateur magnetique stationnaire Ceased WO2000053818A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU33840/00A AU3384000A (en) 1999-03-08 2000-02-29 Combined separation device of rotary drum cooler and stationary magnetic separator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26435699A 1999-03-08 1999-03-08
US09/264,356 1999-03-08

Publications (1)

Publication Number Publication Date
WO2000053818A1 true WO2000053818A1 (fr) 2000-09-14

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PCT/US2000/005114 Ceased WO2000053818A1 (fr) 1999-03-08 2000-02-29 Dispositif de separation combine constitue d'un dispositif de refroidissement a tambour rotatif et d'un separateur magnetique stationnaire

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WO (1) WO2000053818A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008142197A1 (fr) * 2007-05-18 2008-11-27 Outotec Oyj Procédé et appareil de séparateur magnétique à chaud
CN103447149A (zh) * 2013-09-02 2013-12-18 攀枝花市长森工贸有限公司 铁钛矿磁选机
CN104888951A (zh) * 2015-05-08 2015-09-09 河北钢铁集团矿业有限公司 一种高效率的滚筒式磁选机
US20210394192A1 (en) * 2018-11-12 2021-12-23 Cps Technology Holdings Llc Ball mill cooling system and method
CN114558690A (zh) * 2022-03-14 2022-05-31 环创(厦门）科技股份有限公司 一种用于磁选家电零件的磁选机及具有该磁选机的家电回收装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107790280A (zh) * 2017-10-26 2018-03-13 南京西普环保科技有限公司 一种除铁装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB436138A (en) * 1934-01-26 1935-09-26 Herbert Huband Thompson Improvements in or relating to magnetic separators
US3356352A (en) * 1963-12-18 1967-12-05 Pechiney Prod Chimiques Sa Cooler for finely divided materials and method
US4000060A (en) * 1974-01-28 1976-12-28 Allmanna Svenska Elektriska Aktiebolaget Magnetic separator for hot mixtures containing magnetic components
US4693812A (en) * 1983-03-11 1987-09-15 Raytheon Company Magnetic drum separator
SU1715425A1 (ru) * 1990-03-19 1992-02-28 Луганский Машиностроительный Институт Барабанный магнитный сепаратор
EP0587947A1 (fr) * 1992-09-14 1994-03-23 Paramount Sinters Private Limited Procédé et dispositif de grillage réducteur de minerais de manganèse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB436138A (en) * 1934-01-26 1935-09-26 Herbert Huband Thompson Improvements in or relating to magnetic separators
US3356352A (en) * 1963-12-18 1967-12-05 Pechiney Prod Chimiques Sa Cooler for finely divided materials and method
US4000060A (en) * 1974-01-28 1976-12-28 Allmanna Svenska Elektriska Aktiebolaget Magnetic separator for hot mixtures containing magnetic components
US4693812A (en) * 1983-03-11 1987-09-15 Raytheon Company Magnetic drum separator
SU1715425A1 (ru) * 1990-03-19 1992-02-28 Луганский Машиностроительный Институт Барабанный магнитный сепаратор
EP0587947A1 (fr) * 1992-09-14 1994-03-23 Paramount Sinters Private Limited Procédé et dispositif de grillage réducteur de minerais de manganèse

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 199303, Derwent World Patents Index; Class J01, AN 1993-025638, XP002140563 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008142197A1 (fr) * 2007-05-18 2008-11-27 Outotec Oyj Procédé et appareil de séparateur magnétique à chaud
CN103447149A (zh) * 2013-09-02 2013-12-18 攀枝花市长森工贸有限公司 铁钛矿磁选机
CN104888951A (zh) * 2015-05-08 2015-09-09 河北钢铁集团矿业有限公司 一种高效率的滚筒式磁选机
US20210394192A1 (en) * 2018-11-12 2021-12-23 Cps Technology Holdings Llc Ball mill cooling system and method
US12109570B2 (en) * 2018-11-12 2024-10-08 Cps Technology Holdings Llc Ball mill cooling system and method
CN114558690A (zh) * 2022-03-14 2022-05-31 环创(厦门）科技股份有限公司 一种用于磁选家电零件的磁选机及具有该磁选机的家电回收装置
CN114558690B (zh) * 2022-03-14 2023-11-14 环创(厦门）科技股份有限公司 一种用于磁选家电零件的磁选机及具有该磁选机的家电回收装置

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