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WO2007146430A2 - Dispositif et procédé pour traiter des 'fines' métallurgiques dans des fours électriques à arc (fea) - Google Patents

Dispositif et procédé pour traiter des 'fines' métallurgiques dans des fours électriques à arc (fea) Download PDF

Info

Publication number
WO2007146430A2
WO2007146430A2 PCT/US2007/014098 US2007014098W WO2007146430A2 WO 2007146430 A2 WO2007146430 A2 WO 2007146430A2 US 2007014098 W US2007014098 W US 2007014098W WO 2007146430 A2 WO2007146430 A2 WO 2007146430A2
Authority
WO
WIPO (PCT)
Prior art keywords
container
vessel
providing
electric arc
containers
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/US2007/014098
Other languages
English (en)
Other versions
WO2007146430A3 (fr
Inventor
Leonard Reiffel
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.)
Iron Mount Corp
Original Assignee
Iron Mount Corp
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 Iron Mount Corp filed Critical Iron Mount Corp
Publication of WO2007146430A2 publication Critical patent/WO2007146430A2/fr
Publication of WO2007146430A3 publication Critical patent/WO2007146430A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • C21C2005/5288—Measuring or sampling devices
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet
    • 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
    • C21C2200/00—Recycling of waste material
    • 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

  • Mill scales (often finely divided Iron Oxides) are generated in huge quantities by the steel industry. Millions of tons of mill scale have accumulated over many decades. These accumulations constitute a troublesome waste product both in terms of the valuable but lost iron they contain but also because of the serious and expensive environmental and disposal issues . they present. In addition, current operations in Iron and Steel plants are constantly adding to the global inventory of these wastes. [0002] This application claim priority to US provisional application no. 60/813,082 filed on
  • EAFs Electric Arc Furnaces
  • the scrap steel is in solid form, and pieces of the charge can weigh 5 tons each although much smaller pieces are included especially near the center of the EAF 10.
  • An EAF vessel 16 can be 26 feet in diameter and contain some 200 tons of material for melting and processing in a single heat that can take about 2 hours to complete. Loading (typically using large clam-shells and cranes) is done through a removable top cover 18 and can take 20-30 minutes. The EAF 10 is then closed and a low power arc is struck. The low power arc melts the smaller pieces of ferrous scrap positioned near the center of the EAF.
  • the molten steel 20 collects in the bottom of the EAF 10 and the electrode(s) 12 gradually descends into deeper portions of the stack of scrap. As the electrode 12 descends, outlying and generally larger heavier scrap positioned by the EAF operator tend to protect the EAF walls from intense thermal radiation. The arc power can then be increased until all material is molten. At this stage, the furnace walls are also somewhat protected by a frothy metal-gas mixture overlying the hot molten metal 20. The melt is ultimately transferred out of the EAF and loading of another batch of ferrous scrap begins.
  • PCT/US2005/020832 both filed on 12 June 2005
  • PCT application serial no. PCT/US2006/39969
  • PCT application serial number not yet known
  • the capsules 22 can be large, generally cylindrical in form. For example, they might be steel pipes up to 4 feet in diameter or more and perhaps 10 feet high depending on the dimensions of the EAF. Such capsules 22 can contain 10 tons or more of ferrous material. Alternatively, the capsules 22 can be significantly smaller size.
  • Some of the concepts disclosed here involves one, or more, of the following: (1) containerizing quantities of ferrous substances and/or other materials in a capsule 22; (2) placing one or more capsules 22 within an EAF 10 or similar facility; (3) preferably rapidly placing a number of such capsules 22 around the perimeter of the melting vessel 16 so positioned that they protect the vessel lining from impact by scrap and from intense radiation during initial stages of melting; (4) arranging the capsules 22 in such a fashion that they leave the center portion of the vessel available for filling with scrap that is traditionally melted during the low power phase of furnace operation to form a pool of molten material 20; (5) arranging for the capsules 22 to melt from the bottom up in such manner that they tend to slide, in orderly fashion, downward and inward toward the vessel center during subsequent higher power phases of furnace operation (see Figs.
  • the capsule 22 might be made of 1/8" steel plate or whatever thickness is required for adequate strength and contains about $200 of steel at current prices and most, if not all, of this cost is recovered in the EAF melt because the steel container contributes to the melt.
  • the fabrication and fill cost, in quantity should be under $150.
  • eight capsules 22 are loaded per melt and contain 75% fines 24 and 25% scrap 26 by weight for a total cargo weight of 80 tons.
  • the net cost difference of the produced hot steel can then be very roughly estimated at $9000 in favor of the capsule 22 sources at current scrap prices. This estimate does not include any (positive or negative) differences in electrical energy consumed or combustion
  • BTUs contributed by cargo materials in the capsules The direct costs of the fines 24 are assumed already written off for accounting purposes. Melts can be processed 8-10 times per day.
  • a capsule can include one or more of the various features discussed throughout this specification (even if not specifically discussed with respect to this figure).
  • the Figures show a relatively simple spherical section but the bottom 30 can have any useful symmetrical or asymmetrical shape that facilitates good behavior during loading and settling as the capsule begins to melt.
  • a fusible or consumable stand-off bar 34 that helps to maintain a stable position and tilt of the capsule 22 as it gradually subsides or settles into the melt 20 (see Figs. 2 A and 2B).
  • the basic cylindrical body of the capsule 22 can also (or in the alternative) have a shaped steel plate(s) or other consumable a ⁇ pendage(s) 36 that helps control the posture of the capsule and its submergence into the melt 20.
  • Sub-capsules 38 can include special chemical mixes and can be part of the cargo contained within capsule 22, as can capsules of the various types disclosed in my above mentioned previously filed Provisional Applications and the US and PCT Applications following there-from can also be used as such sub-capsules 38.
  • Vents 40 can be provided that open during heating (such as fusible vents that melt open after exposure to sufficient heat for a sufficient period of time) to release internal capsule pressure as well as combustion and vaporization products 41.
  • the latter can be collected through appropriate gas handling and vapor recovery systems 43 associated with the so-called "second" or "fourth" holes 42 in typical EAFs 10 as shown in Figure 2 A.
  • the EAF 10 has been in low power mode. Melting is occurring in the central scrap.
  • the capsule As the capsule is heated, its content undergoes some agglomeration and reduction of oxides and combustion of carbonaceous material, when the capsule 22 contains carbon containing materials and iron oxide as part of its cargo.
  • the weight of the overburden in the Capsule tends to prevent its floating on melt 20.
  • some sets of snubbers 46 can be provided and can include snubber cable 48 attached to the containers 22 and snubber hooks 50 attached to vessel 16 where the snubber cables are hooked onto the snubber hooks so that capsules 22 stay in position for an appropriate period of time.
  • the snubber cables can include fusible connectors or joints that melt when exposed to a sufficient amount of heat for a sufficient period of time so that the capsules 22 become released from the vessel 16 to allowed for appropriate positioning and/or controlled descent control of containers 22.
  • Fig. 2A 5 the EAF 10 is shown in the early stage of the melt cycle.
  • Figure 2B the EAF 10 has been brought to full power and is at a later stage of the melt cycle. Melting of the entire charge is proceeding rapidly. Note the possibility of a liquid metal seal 52 developing at the open end of the surviving portion of the capsules 22 and possible injection of content beneath a floating slag layer (see my earlier provisional applications concerning such liquid seal and content injection) that is part of melt 20. Basically, the liquid metal will theoretically provide a seal between the contents and the air such that the contents of capsule 22 can only escape the capsule by entering the liquid metal.
  • Gases and vapors 41 are now flowing copiously through the 2nd hole and into the appropriate filtering, dust collection and handling systems 43.
  • purpose-built versions of the technology disclosed here can be used in waste recovery and utilization processes such as heat and metal recovery, exploitation of scrap tires and/or plastics, thermal reprocessing of ores and the like.
  • waste products such as elastomers and plastics can be used as a source of carbon or energy.
  • the oil, tar and bitumens in dirty mill scale can also be used as a heat source.
  • Plasma torch technologies have similar aims.
  • Figures 3 A and 3B display some of the features of one of many possible fast-loading concepts for placing the EAF 10 charge.
  • one of a group of eight 10 ton pre-filled capsules 22 is being positioned in a template 54 by a small crane or similar device (not shown) while the EAF 10 is closed and in operation.
  • a re-usable and detachable fast loading rig 56 (see Fig. 3B) then is coupled to the array of capsules 22 and a heavy lift crane places the capsules 22 gently into the EAF 10 (when it is ready for a new charge) in one operation as shown schematically in Figure 3B.
  • FIG 4 shows a top view of an open EAF 10 with eight capsules 22 in place.
  • Capsules 22 can be located in non-interfering positions between EAF accessory melt devices eg lances etc. which are not shown.
  • the optional positioni ⁇ g/snubber blocks 50 can be simply protruding short lengths of strong refractory material installed on the furnace wall that can help with maintenance of proper orientation and descent behavior of the capsules before and during the melt cycle.
  • the capsules 22 are designed so they tend to settle and sag inward and down toward the horizontal during high power melt phase.
  • Protuberances 36 can be provided on one or more of the capsules 22 to aid with posture and facilitate the radially- inward slide of the melting capsules as noted in the description concerning Figure 1.
  • Process going on inside the capsule 22 can be important to the overall performance of the system. For example, if coals or other carbon-containing materials are present in the capsule cargo, intermixed or layered coal and scale promotes downward flow of coal tars into and thru scale layers assisting both rapid oxide reduction and agglomeration. Preheating major portions of the capsules with attendant tar percolation, combustion, binding effects and agglomeration can have positive benefits on energy balances, melt chemistry and off-gas production. An important tool in these regards is an ability to tailor the power input profiles to the arc and perhaps electrode height to achieve optimum capsule pre-heating.
  • An additional technique is to use external support mechanisms and devices (for example, 34, 36, 44, 48, 50 and/or 46) for controlling the posture and settling behavior of a capsule 22 which, in turn, affects the thermal profile experienced by its cargo.
  • Such devices can be mounted on and used through the sides of the EAF vessel 16 and/or through its top 18, but typically these introduce complexity that it would be desirable to avoid.
  • another and low-complexity alternative is disclosed below which involves thermally-actuated restraints comprised of cables 48 and snubber blocks 50 attached near the cooler top 18 of the EAF 22 and affixed to the capsules.
  • the principles of the method are shown in Figures 5A and 5B.
  • the downward slide of the capsules will be delayed by the presence of the cable(s) 48 and the majority of the capsule cargo will continue to pre-heat without further rapid descent.
  • fusible links set to release at a given temperature then detach (i.e. effectively cut) the cables 48.
  • the capsules 22 are restrained from sudden lateral motion by the snubber blocks 50 and the posture control plates 36 of Figure 1, if present. The capsules 22 then descend in a manner purely dependent upon melt rate and remaining content weight.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Dispositif et procédés pour recycler des fines de fer, par exemple de la calamine. Dans une forme, la calamine est placée dans des récipients qui sont ensuite placés comme une partie de la charge dans un four électrique à arc ou dans un autre appareil approprié utilisé dans un traitement de métallurgie. La capsule peut alors être configurée de manière à commander le déplacement de la capsule pendant le cycle de fusion. Dans une forme, différents appendices sont couplés à la capsule et sont utilisés pour interagir avec la paroi de cuve du four électrique à arc ou de tout autre appareil approprié utilisé dans un traitement de métallurgie pour commander et/ou retarder le déplacement de la capsule pendant le cycle de fusion. Les appendices peuvent aussi être fixés à la paroi de cuve pour commander et/ou retarder le déplacement de la capsule pendant le cycle de fusion. Dans une forme, des câbles de rouleau d'applique peuvent être accrochés aux appendices de la paroi de cuve dans le but d'aider la commande du déplacement et/ou le retard du déplacement. Dans une forme, les capsules sont étanches, de telle sorte que l'évacuation des gaz internes soit difficile, au moins pendant un certain temps, après l'application de la chaleur. Des évents fusibles peuvent être prévus, par exemple à l'endroit où une partie du récipient étanche fond suite à l'application d'une quantité de chaleur suffisante pendant une période de temps suffisante.
PCT/US2007/014098 2006-06-13 2007-06-13 Dispositif et procédé pour traiter des 'fines' métallurgiques dans des fours électriques à arc (fea) Ceased WO2007146430A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81308206P 2006-06-13 2006-06-13
US60/813,082 2006-06-13

Publications (2)

Publication Number Publication Date
WO2007146430A2 true WO2007146430A2 (fr) 2007-12-21
WO2007146430A3 WO2007146430A3 (fr) 2008-02-21

Family

ID=38832571

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/014098 Ceased WO2007146430A2 (fr) 2006-06-13 2007-06-13 Dispositif et procédé pour traiter des 'fines' métallurgiques dans des fours électriques à arc (fea)

Country Status (1)

Country Link
WO (1) WO2007146430A2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2834380A4 (fr) * 2012-04-05 2015-12-30 Global Iron & Steel Services Llc Procédé de récupération de fer/acier dans des battitures et fines
WO2017115219A1 (fr) * 2015-12-29 2017-07-06 Sabic Global Technologies B.V. Systèmes et procédés d'alimentation de sous-produits de fabrication dans un four
WO2019040592A1 (fr) 2017-08-23 2019-02-28 Amerifab, Inc. Système de tri et d'emballage de déchets de fabrication du fer et d'aciérie et procédé associé
WO2022117315A1 (fr) * 2020-12-03 2022-06-09 Compagnia Commerciale Srl Procédé de fusion de métaux ferreux, de métaux non ferreux, de déchets d'usinage et de ferraille et d'acier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1765971A4 (fr) * 2004-06-12 2009-07-01 Iron Mount Corp Procede et appareil permettant d'executer un processus metallurgique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2834380A4 (fr) * 2012-04-05 2015-12-30 Global Iron & Steel Services Llc Procédé de récupération de fer/acier dans des battitures et fines
WO2017115219A1 (fr) * 2015-12-29 2017-07-06 Sabic Global Technologies B.V. Systèmes et procédés d'alimentation de sous-produits de fabrication dans un four
WO2019040592A1 (fr) 2017-08-23 2019-02-28 Amerifab, Inc. Système de tri et d'emballage de déchets de fabrication du fer et d'aciérie et procédé associé
JP2020531693A (ja) * 2017-08-23 2020-11-05 アメリファブ，インコーポレイテッド 製鋼用スクラップおよび製鉄用スクラップを分離およびパックするシステムおよびその方法
EP3673089A4 (fr) * 2017-08-23 2021-04-28 Amerifab, Inc. Système de tri et d'emballage de déchets de fabrication du fer et d'aciérie et procédé associé
WO2022117315A1 (fr) * 2020-12-03 2022-06-09 Compagnia Commerciale Srl Procédé de fusion de métaux ferreux, de métaux non ferreux, de déchets d'usinage et de ferraille et d'acier

Also Published As

Publication number Publication date
WO2007146430A3 (fr) 2008-02-21

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