EP4389919A1 - Fusion optimisée de dri densifié - Google Patents

Fusion optimisée de dri densifié Download PDF

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Publication number
EP4389919A1
EP4389919A1 EP23169795.4A EP23169795A EP4389919A1 EP 4389919 A1 EP4389919 A1 EP 4389919A1 EP 23169795 A EP23169795 A EP 23169795A EP 4389919 A1 EP4389919 A1 EP 4389919A1
Authority
EP
European Patent Office
Prior art keywords
melting
hbi
hcl
fragments
comminution
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.)
Pending
Application number
EP23169795.4A
Other languages
German (de)
English (en)
Inventor
Robert Millner
Jan-Friedemann Plaul
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.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
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 Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to PCT/EP2023/085655 priority Critical patent/WO2024132798A1/fr
Publication of EP4389919A1 publication Critical patent/EP4389919A1/fr
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0086—Conditioning, transformation of reduced iron ores
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
    • C21B13/143—Injection of partially reduced ore into a molten bath
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C22B1/005—Preliminary treatment of scrap
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/18—Arrangements of devices for charging
    • 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
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices

Definitions

  • the application relates to a method for melting DRI consisting at least partially of HBI and/or HCl by means of a melting process.
  • DRI direct reduced iron
  • DRI is often compacted when hot - i.e. as HDRI hot direct reduced iron.
  • the product of compaction is called, for example, HBI hot briquetted iron when producing briquettes, or HCl hot compacted iron when producing DRI in a fluidized bed.
  • compaction to HBI or HCl helps to avoid yield losses due to dust losses and quality losses.
  • the standard size of HBI briquettes available worldwide and shippable due to an apparent density greater than or equal to 5.0 g/cm 3 is 106 x 48 x 33 mm; this results from the desire to achieve the highest possible HBI output with the fewest possible briquetting machines.
  • the apparent density of HCl is lower than that of HBI and is below 5.0 g/cm 3 - typically in the range 3.5-4.2 g/cm 3 - and is therefore not suitable for ship transport due to IMO.
  • the size of HCl can also be smaller than that of HBI, for example 50 x 38 x 22 mm.
  • a method is presented that allows to reduce or avoid at least some of the above-mentioned disadvantages when using compacted DRI.
  • DRI can be uncompressed or compressed.
  • HBI and HCl are special cases of the general term DRI; they refer to compressed DRI.
  • the melting process is carried out using electrical energy.
  • the method according to the invention allows a higher addition rate to a melting process than if HBI or HCl were added to it without the crushing according to the invention. In order to increase the addition rate, it is therefore not necessary to resort to increasing the energy supplied to the melting process, as was previously the case - which can have an adverse effect on productivity. Disadvantages compared to melting uncompacted DRI are thus at least reduced.
  • the comminution is a breaking process, which preferably takes place in at least two stages.
  • a crushing process produces fragments of HBI or HCl.
  • a crushing process is carried out using crushers; a single crusher or a crushing system with several crushers can be used - for example arranged in several consecutive stages, with a rear stage being supplied with the fragments or pieces produced in the previous stage as starting material for the comminution taking place in it.
  • a crushing process carried out using several consecutive stages is multi-stage.
  • the size of the fragments is preferably reduced to a size - also called grain size - which is in a range from 3.35 mm to 31.5 mm, preferably from 3.35 mm to 25 mm, particularly preferably 6.3 mm to 16 mm.
  • the limits of the ranges are also included.
  • the upper limit for the size of the fragments preferably obtained during the size reduction is preferably 31.5 mm, particularly preferably 25 mm, very particularly preferably 16 mm.
  • the lower limit for the size of the fragments preferably obtained during the size reduction is preferably 3.35 mm, particularly preferably 6.3 mm.
  • fragments obtained during comminution are fed to the melting process, regardless of whether they actually lie in the above-mentioned range of 3.35 to 31.5 mm or its preferred and particularly preferred sub-ranges or not.
  • fragments whose grain size lies in the above-mentioned range of 3.35 to 31.5 mm or its preferred and particularly preferred sub-ranges are fed to the melting process, but also fragments lying outside this range or the sub-ranges.
  • a minimum size is defined for the fragments arising during comminution, and fragments arising during comminution below the minimum size are separated, and only fragments above the minimum size are fed to the melting process.
  • fragments obtained during comminution are:
  • the parts are only fed into the melting process if they actually lie within the above-mentioned range of 3.35 to 31.5 mm or its preferred and particularly preferred sub-ranges.
  • the DRI consists entirely of HBI and/or HCl.
  • a melting unit melts at least partially based on electrical energy.
  • EAF, SAF and OSBF are not to be understood as a melting aggregate in the context of this application.
  • a converter vessel is, for example, a steelworks converter for steel production.
  • a minimum size is defined for the fragments resulting from the comminution, and fragments resulting from the comminution below the minimum size are separated.
  • Separation is achieved, for example, by sieving.
  • the fragments below the minimum size can be fed into a process for the production of HBI or HCl - for example by means of bucket elevators or pneumatic conveying - to be compacted together with HDRI.
  • Fragments above the minimum size are at least partially fed into the melting process.
  • the HBI 40 is crushed in the crushing device 70 - this can be single-stage or multi-stage, for example two-stage.
  • the crushing device is a crusher. Fragments of the HBI 40 obtained during crushing are fed to the melting device 50 via the intermediate bunker 60.
  • the crushing device 140 Before feeding - which in the example shown takes place via an intermediate bunker 130; however, it can also take place directly, i.e. without an intermediate bunker - the HCl 110 is crushed in the crushing device 140 - this can be single-stage or multi-stage, for example two-stage.
  • the crushing device is a crusher. Fragments 150a, 150b of the HCl 110 obtained during crushing are sieved in a sieving device 160. Only the fragments 150a above a minimum size are fed to the melting device 120 via the intermediate bunker 130. The fragments 150b below the minimum size are fed to the compacting device 100 to be compacted there together with HDRI.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP23169795.4A 2022-12-21 2023-04-25 Fusion optimisée de dri densifié Pending EP4389919A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2023/085655 WO2024132798A1 (fr) 2022-12-21 2023-12-13 Fusion optimisée de fer préréduit (dri) compacté

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22215246 2022-12-21

Publications (1)

Publication Number Publication Date
EP4389919A1 true EP4389919A1 (fr) 2024-06-26

Family

ID=84547232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23169795.4A Pending EP4389919A1 (fr) 2022-12-21 2023-04-25 Fusion optimisée de dri densifié

Country Status (1)

Country Link
EP (1) EP4389919A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150203931A1 (en) * 2012-08-03 2015-07-23 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Method for producing metallic iron
US9453682B2 (en) * 2009-03-18 2016-09-27 Rafic Boulos Daou Steel production facility

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9453682B2 (en) * 2009-03-18 2016-09-27 Rafic Boulos Daou Steel production facility
US20150203931A1 (en) * 2012-08-03 2015-07-23 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Method for producing metallic iron

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