US3664827A - Method for refining molten iron or molten iron alloys - Google Patents

Method for refining molten iron or molten iron alloys Download PDF

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Publication number
US3664827A
US3664827A US818283A US3664827DA US3664827A US 3664827 A US3664827 A US 3664827A US 818283 A US818283 A US 818283A US 3664827D A US3664827D A US 3664827DA US 3664827 A US3664827 A US 3664827A
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US
United States
Prior art keywords
molten
molten iron
iron
refining
oxygen
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.)
Expired - Lifetime
Application number
US818283A
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English (en)
Inventor
Ryo Ando
Tsutomu Fukushima
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.)
JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Application granted granted Critical
Publication of US3664827A publication Critical patent/US3664827A/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • F27D27/00—Stirring devices for molten material
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • 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
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/008—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising cross-beams or gantry cranes
    • 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
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/125—Charging cars, lift trolleys
    • F27D2003/127—Charging cars, lift trolleys for carrying pots
    • 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
    • F27D3/16—Introducing a fluid jet or current into the charge
    • F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
    • F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
    • F27D2003/164—Oxygen

Definitions

  • This invention relates to a novel method and apparatus for refining molten iron or iron alloys and more particulary to a method and apparatus for rapidly removing impurities in molten pig iron, especially phosphorus and sulphur by causing it to react with oxygen and slag.
  • this invention contemplates to readily remove such impurities as phosphorus, sulphur and chromium and the like while limiting to the minimum the variation of other components, especially carbon, by mechanically stirring only the upper layer portion of molten iron kept in a ladle by means of a stirring rod made of carbonaceous material or other refractory material while at the same time blowing oxygen onto the surface of the iron through a lance and by continuously charging a required quantity of reactant.
  • the shaking ladle method involves imparting eccentric motion to a container of the molten pig iron or the ladle itself for the purpose of increasing the speed of movement of the molten pig iron and to increase the contact surface between the slag and the molten iron. Accordingly, splash of the slag and molten pig iron becomes excessive which requires an excessively large container so that practical use of this method is limited.
  • the soft blow refining process with a LD. converter requires a refining time twice as long as the ordinary refining time.
  • a refining time twice as long as the ordinary refining time.
  • the apparatus of this invention comprises a mechanism for stirring the upper layer portion of the molten pig iron, a mechanism for blowing oxygen onto the surface of the molten pig iron, and a mechanism for charging a reactant into a ladle containing the molten pig iron.
  • FIG. 1 is a plan view of the apparatus embodying this invention, and;
  • FIG. 2 shows a vertical sectional view of the apparatus shown in FIG. 1 in which the left hand half shows a section taken along a line Ila-Ha and the right hand half shows a section taken along a line IIbHb in FIG. 1.
  • a ladle for receiving molten pig iron and mounted on a suitable carriage is disposed substantially below the center of a treating table supporting frame 1.
  • Stirring rods 3- of carbonaceous material or other suitable refractory material are arranged in the upper portion of the ladle 2.
  • Stirring rods 3 are secured to a disc 5 at the lower end of a stirring shaft 4 so that when the shaft 4 is lowered, the
  • stirring rods 3 are immersed into the upper portion of the molten pig iron kept in the ladle.
  • the stirring shaft 4 is connected to a swinging frame 7 provided with three radial arms 6 and the vertical movement of shaft 4 is effected by a motor 8 connected to the swinging frame 7 through a. reduction gearing.
  • a stub shaft 9 At the lower side of the free end of each arm 6 is projected a stub shaft 9.
  • a shaft 11 driven through a suitable transmission mechanism by a motor mounted on the treating table supporting frame 1 is provided thereon and the stub shafts 9 and the shaft 11 are interconnected with suitable eccentricity, for example, of 150 mm.
  • the stub shaft 9 will be rotated about the axis of the shaft 11 with a radius corresponding to said eccentricity.
  • the axis of stirring shaft 4 Will be moved along a circle through arms 6 and the swinging frame 7, thus imparting a circular motion to stirring rods 3 to effect stirring of the surface of the molten pig iron.
  • the oxygen blowing mechanism comprises water cooled lances suspended from a supporting structure 12 upstanding from the treating table supporting frame 1.
  • the water cooled lances include a first lance 13 which extends through a guide 14.
  • First lance 13 is vertically moved by a suspension wire and is fixed to guide 14 by means of a handle 16.
  • a second lance 13- which extends through a guide 14' secured to the stirring shaft 4, is vertically moved by a suspension wire 15 and is secured to the stirring shaft 4 by means of a handle 16'.
  • the number of first lances 13 that are fixed to the treating table supporting frame is three whereas the number of second lances 13' secured to swinging shaft 4 is one.
  • Oxygen is supplied to the treating table supporting frame 1 through a conduit 17, and distribution pipes 18 branched from the conduit 17 are connected to lances 13 and 13' via flexible pipes 19 to blow oxygen onto the upper surface of the molten pig iron through the lower ends of lances 13- and 13'.
  • the reactant charging device includes a bucket 20 suspended from a hoist 21 movable along a beam 22 on the treating table supporting frame 1.
  • the bucket 20 operated by the hoist 21 is used to supply the reactant into a hopper 23 mounted on the treating table supporting frame.
  • an electromagnetic feeder 24 is provided to incorporate the reactant onto the surface of the molten pig iron in the ladle through a chute 25.
  • this invention provides a refining apparatus for molten iron comprising a stirring mechanism, an oxygen blowing mechanism and a reactant charging mechanism wherein oxygen is blown upon the surface of the molten pig iron through lances 13 and 13 while the surface layer portion of the molten pig iron is stirred by the operation of a motor 10* and wherein the reactant is continuously charged while the molten iron is stirred and the oxygen is blown.
  • a refining apparatus for molten iron comprising a stirring mechanism, an oxygen blowing mechanism and a reactant charging mechanism wherein oxygen is blown upon the surface of the molten pig iron through lances 13 and 13 while the surface layer portion of the molten pig iron is stirred by the operation of a motor 10* and wherein the reactant is continuously charged while the molten iron is stirred and the oxygen is blown.
  • the slag forming agent may be in the form of small granules which not only increases the speed of forming the desired slag but also enables readily adjustments of slag composition and temperature. Further it is possible to employ existing ladles without the necessity of changing the process steps.
  • this invention provides a novel method of refining iron and iron alloys which can readily and rapidly remove impurities therein and improve the efficiency of oxygen and reactants so that ordinary pig iron for cast iron and for steel manufacturing can be readily converted into pig iron of low phosphorus and sulphur content at very low cost.
  • This also enables manufacture with converters species of steel which heretobefore could be obtained only with electric furnaces.
  • pig iron of low phosphor and sulphur content or low silicon content is prepared with electric furnaces, it becomes possible to charge a large quantity of the pig iron into the electric furnace thus decreasing electric power and hence cost of the raw material. Further it is possible to increase the efiiciency of steel manufacturing and the useful life of expensive refractories utilized in the furnace.
  • a plurality of lances for blowing oxygen may be provided aslant to the treating table supporting frame so as to blow oxygen from the upper corner of the ladle; and the location of said lance is not limited to that herein defined-Le, in the axis of stirring shaft.
  • the decrease of carbon in the molten iron is small in the present refining method because the main object of the invention lies in the refining of impurities, and not in the decarburization of major carbon content.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
US818283A 1968-04-24 1969-04-22 Method for refining molten iron or molten iron alloys Expired - Lifetime US3664827A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2706268 1968-04-24

Publications (1)

Publication Number Publication Date
US3664827A true US3664827A (en) 1972-05-23

Family

ID=12210567

Family Applications (1)

Application Number Title Priority Date Filing Date
US818283A Expired - Lifetime US3664827A (en) 1968-04-24 1969-04-22 Method for refining molten iron or molten iron alloys

Country Status (9)

Country Link
US (1) US3664827A (de)
AT (1) AT322595B (de)
BE (1) BE732046A (de)
CA (1) CA926616A (de)
DE (1) DE1920958A1 (de)
FR (1) FR2006852A1 (de)
GB (1) GB1259702A (de)
NL (1) NL6906228A (de)
RO (1) RO54779A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006021066A1 (en) * 2004-08-27 2006-03-02 De Castro Marcio Moraes System of gas and/or gas and powders injection in liquid metals throough rotary refractory lance

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU83089A1 (de) * 1981-01-26 1981-06-04 Wurth Anciens Ets Paul Vorrichtung und halterung zum wechseln von tauchlanzen
DE102009035267A1 (de) 2009-07-29 2011-02-03 Fabrino Produktionsgesellschaft Mbh & Co. Kg Wasserbasiertes Beschichtungsmittel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1335661A (fr) * 1962-06-29 1963-08-23 Siderurgie Fse Inst Rech Perfectionnements aux procédés de déphosphoration des bains de métaux ferreux en fusion
FR1358812A (fr) * 1963-06-04 1964-04-17 Stora Kopparbergs Bergslags Ab Procédé d'affinage de la fonte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006021066A1 (en) * 2004-08-27 2006-03-02 De Castro Marcio Moraes System of gas and/or gas and powders injection in liquid metals throough rotary refractory lance

Also Published As

Publication number Publication date
RO54779A (de) 1974-01-03
GB1259702A (en) 1972-01-12
NL6906228A (de) 1969-10-28
FR2006852A1 (fr) 1970-01-02
DE1920958B2 (de) 1975-09-18
FR2006852B1 (de) 1973-02-02
BE732046A (de) 1969-10-01
AT322595B (de) 1975-05-26
CA926616A (en) 1973-05-22
DE1920958A1 (de) 1969-11-06

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