WO1997026101A1 - Puits ameliore servant au chargement du metal en fusion - Google Patents

Puits ameliore servant au chargement du metal en fusion Download PDF

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Publication number
WO1997026101A1
WO1997026101A1 PCT/US1997/000775 US9700775W WO9726101A1 WO 1997026101 A1 WO1997026101 A1 WO 1997026101A1 US 9700775 W US9700775 W US 9700775W WO 9726101 A1 WO9726101 A1 WO 9726101A1
Authority
WO
WIPO (PCT)
Prior art keywords
diverter
molten metal
receptacle
leading edge
charge well
Prior art date
Application number
PCT/US1997/000775
Other languages
English (en)
Inventor
Ronald E. Gilbert
Chris T. Vild
Richard S. Henderson
Mark A. Bright
Original Assignee
Metaullics Systems Co. L.P.
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 Metaullics Systems Co. L.P. filed Critical Metaullics Systems Co. L.P.
Priority to EP97903843A priority Critical patent/EP0874704A4/fr
Publication of WO1997026101A1 publication Critical patent/WO1997026101A1/fr

Links

Classifications

    • 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
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • the invention relates to apparatus for metal refining and is directed to an improved molten metal charge well for melting solid metal pieces into a molten metal bath.
  • the invention is particularly applicable to aluminum refining.
  • metal refining apparatus typically include a large furnace which provides molten metal to a charge well, where scrap metal pieces or particles are added to the molten metal.
  • a molten metal pump is provided for conveying the molten metal from the furnace to the charge well. From the charge well, the metal flows into a skim well where impurities are removed prior to reintroduction of the metal to the furnace.
  • the molten metal in the charge well typically includes a skim and dross layer on top which insulates the molten metal from the atmosphere. In this way, scrap metal may be melted while the generation of metal oxides, which are detrimental to the refining process, is prevented or reduced.
  • a variety of charge well constructions were evaluated by the applicants. Four vortex wells were water modeled at a 5/6 scale in the laboratory. The key desirable parameters of the designs include: a) facile submergence for quick melting (heat transfer) and high feed rates; and b) a relatively calm surface of the molten metal bath for minimization of dross formations in a molten aluminum application.
  • Test 1 molten metal was directed tangentially into a cylindrical charcfe well and removed in a tangential direction to establish a vortex.
  • Test 2 molten metal was directed tangentially into a bowl-shaped charge well via a somewhat restrictive conduit which established a relatively high pressure flow. In this case the molten metal entered near the top of the charge well and was withdrawn at the base.
  • Test 3 molten metal was provided to the charge well via an upwardly sloped relatively wide diameter conduit which did not provide a pressure increase of the magnitude achieved by the conduit in Test 2. Again, the molten metal was withdrawn from the base of the charge well.
  • Test 4 used a molten metal conduit similar to that utilized in Test 3.
  • the flow diverter of Test 4 was comprised of a wedge-shaped body having an arcuate downward facing surface directing flow downward.
  • the body also includes a relatively wide leading edge which tapers to a narrow trailing edge.
  • the invention addresses the disadvantages of the prior art by providing a charge well configuration which facilitates the submergence of incoming scrap metal using a simple and inexpensive implement.
  • the invention provides a stationary diverter, baffle or wing, etc. , within the charge well for diverting the circular flow of molten metal, caused by the orientation of the inlet port, in a downward direction, thereby creating a downward flow of molten metal which results in quick and efficient submergence of incoming lightweight scrap metal pieces or particles.
  • the diverter includes a leading edge which extends in a generally radial direction within the charge well and a flat top surface which tapers from the leading edge to a point or narrowed trailing edge. A downward curved surface extends from the leading edge to facilitate the downward flow of molten metal.
  • FIGURE 1 is a schematic diagram illustrating the component parts of an aluminum refining apparatus according to the present invention.
  • FIGURE 2 is a top view of a charge well according to a preferred embodiment of the invention.
  • FIGURE 3 is a front view of a charge well according to a preferred embodiment of the invention.
  • FIGURE 4 illustrates a mounting configuration for a diverter according to the present invention.
  • FIGURE 5A, FIGURE 5B and FIGURE 5C show top, side and front views, respectively, of a diverter according to the present invention.
  • FIGURE 1 there is illustrated generally an apparatus for melting solid metal scrap pieces.
  • the apparatus is comprised of a furnace A, molten metal circulation pump B, charge well C, and skim well D.
  • furnace A provides molten metal via circulation pump B to charge well C.
  • Solid metal particles are introduced into the molten metal in the charge well C.
  • the molten mixture then flows into a skim well D where the dross, skim and impurities are removed before the molten metal is reintroduced into furnace A.
  • This general operation is known in the art.
  • Charge well C comprises a generally bowl- shaped receptacle 8 which is constructed primarily of a refractory material and provided with an inlet conduit 12 and inlet port 14, as well as an outlet conduit 16 and outlet port 18. It will be recognized that the invention is applicable to different charge well shapes, such as cylindrical and/or flat bottom shapes.
  • Inlet conduit 12 receives the molten metal from circulation pump B and conveys the molten metal to the charge well with a tangential flow such that the molten metal circulates in a clockwise direction as indicated by arrow AA.
  • the outlet port 18 is located at or near the bottom center of the bowl-shaped receptacle. Thus, the flow of molten metal proceeds from the inlet port 14 near the top of the bowl in a clockwise spiral downward to the center of the bowl. This results in a vortex flow pattern. Outlet port 18 and outlet conduit 16 convey the molten metal from charge well C to skim well D.
  • a diverter 20 made primarily of refractory material, is provided in charge well C for diverting the molten metal flow downward within the charge well c.
  • diverter 20 includes a leading edge 22 which first encounters the vortex flow.
  • Leading edge 22 defines a generally planar top surface 24 which tapers to a narrow trailing edge 26.
  • leading edge 22 is placed at a position of about 270 degrees from the inlet port 14.
  • Trailing edge 26 is depicted as a point in FIGURE 2 and extends into the plane of the drawing. As is apparent, leading edge 22 and trailing edge 26 are substantially perpendicular to one another.
  • Diverter 20 also includes an arcuate downward facing surface 28 as shown in FIGURE 3 for diverting the vortex flow of molten metal in a downward direction as indicated by arrow BB.
  • Arrow CC in FIGURE 3 indicates the general direction at which metal particles enter charge well C.
  • the mounting details for a diverter include a pair of cross members 50 and 52, which may be constructed from 4-inch by 4-inch square tubing.
  • cross members 50 and 52 Welded to cross members 50 and 52 are main support members 54 and 56 which are provided with a pair of slots 58 therein. Slots 58 receive studs 60 which are affixed to the charge well inserts 62 and 64 which each comprise a thick wall of refractory material with an arcuate surface 66 thereon.
  • diverter support bracket 68 which is provided with a slot 70 for receiving studs 72 that are attached to diverter 20. In this way, diverter 20 is suspended within the charge well from diverter support bracket 68.
  • a diverter may be constructed with exterior side surface 30 having an outer radius Rl of 18.000 inches, which corresponds to the radius of the charge well, thus permitting the diverter to be flush mounted with the charge well wall.
  • Leading edge 22 may be constructed with a length Ll of 10.000 inches.
  • the top surface 24 is provided with an inner radius R2 of 20.147 inches, measured from a point that is disposed from the origin O a distance of 12.01 inches in the x-direction and 1.862 inches in the y-direction.
  • Inner radius R2 partly defines an interior side surface 29.
  • FIGURE 5B which is a side view in a direction from the right side of FIGURE 5A
  • downward facing surface 28 is provided at an angle of approximately 45 degrees and trailing edge 26 is provided with a length L2 of 18.000 inches.
  • exterior side surface 30 is an arcuate surface extending from leading edge 22 to trailing edge 26 and that leading edge 22 extends along a radial line from point O, which corresponds to the center of the charge well.
  • trailing edge 26 intersects a radial line from point 0.
  • These radial lines define an angle ALPHA which is 90 degrees.
  • arcuate exterior side surface 30 subtends angle ALPHA.
  • ALPHA need not be 90 degrees as shown in FIGURE 5A, but may be varied, preferably between 60 and 150 degrees, as suggested by the diverter embodiment shown in FIGURE 4, to achieve variable flow characteristics.
  • FIGURE 5C which is a front view in a direction from below FIGURE 5A, the shape of diverting surface 28 and interior side surface 29 are shown.
  • diverter 20 facilitates the quick and efficient introduction of metal particles into charge well c. Facile submergence and high feed rates of incoming scrap metal are accomplished with the use of the diverter according to the present invention.
  • the present invention also provides a calm surface on the molten metal bath for minimization of dross formations in molten aluminum applications.
  • the diverter has been described in one embodiment as being mounted within the charge well on a support structure, it will be recognized that the diverter may be formed as an integral or homogenous structure with other elements of the charge well, such as the charge well inserts, which are primarily constructed of refractory material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

Dans un puits de chargement (C), par lequel on ajoute des pièces ou des particules de ferraille à un bain de métal en fusion, est ménagé un élément de dérivation fixe (20) servant à faire dévier le flux circulaire de métal en fusion, formé par l'orientation de l'orifice d'admission (14), dans un sens descendant, ce qui crée un flux descendant de métal en fusion qui entraîne une immersion rapide et efficace des pièces ou particules de ferraille entrantes et légères. De préférence, l'élément de dérivation (20) comprend un bord d'attaque (22) qui s'étend dans un sens généralement radial dans le puits de chargement (C) et une partie supérieure plate (24) qui se rétrécit à partir du bord d'attaque (22) jusqu'à un point ou un bord arrière plus étroit. Une surface incurvée descendante (28) s'étend à partir du bord d'attaque (22) afin de faciliter l'écoulement vers le bas du métal en fusion.
PCT/US1997/000775 1996-01-17 1997-01-17 Puits ameliore servant au chargement du metal en fusion WO1997026101A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97903843A EP0874704A4 (fr) 1996-01-17 1997-01-17 Puits ameliore servant au chargement du metal en fusion

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US1010396P 1996-01-17 1996-01-17
US60/010,103 1996-01-17

Publications (1)

Publication Number Publication Date
WO1997026101A1 true WO1997026101A1 (fr) 1997-07-24

Family

ID=21743885

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/000775 WO1997026101A1 (fr) 1996-01-17 1997-01-17 Puits ameliore servant au chargement du metal en fusion

Country Status (3)

Country Link
EP (1) EP0874704A4 (fr)
CA (1) CA2242906A1 (fr)
WO (1) WO1997026101A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ2018180A3 (cs) * 2018-04-11 2019-09-18 FTAProcessing, s.r.o. Způsob zanořování pevných částic kovu do taveniny při tavení kovů a zařízení k jeho provádění

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984234A (en) * 1975-05-19 1976-10-05 Aluminum Company Of America Method and apparatus for circulating a molten media
US4053146A (en) * 1976-03-08 1977-10-11 Ford Motor Company Continuous stream treatment of ductile iron
US5435527A (en) * 1991-10-16 1995-07-25 Pechiney Electrometallurgie Apparatus for the late introduction of particulate alloy when casting a liquid metal

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298377A (en) * 1979-12-03 1981-11-03 Union Carbide Corporation Vortex reactor and method for adding solids to molten metal therewith
US4322245A (en) * 1980-01-09 1982-03-30 Claxton Raymond J Method for submerging entraining, melting and circulating metal charge in molten media
US4286985A (en) * 1980-03-31 1981-09-01 Aluminum Company Of America Vortex melting system
US4598899A (en) * 1984-07-10 1986-07-08 Kennecott Corporation Light gauge metal scrap melting system
US4747583A (en) * 1985-09-26 1988-05-31 Gordon Eliott B Apparatus for melting metal particles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984234A (en) * 1975-05-19 1976-10-05 Aluminum Company Of America Method and apparatus for circulating a molten media
US4053146A (en) * 1976-03-08 1977-10-11 Ford Motor Company Continuous stream treatment of ductile iron
US5435527A (en) * 1991-10-16 1995-07-25 Pechiney Electrometallurgie Apparatus for the late introduction of particulate alloy when casting a liquid metal

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0874704A4 *

Also Published As

Publication number Publication date
CA2242906A1 (fr) 1997-07-24
EP0874704A1 (fr) 1998-11-04
EP0874704A4 (fr) 1999-07-14

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