US3378366A - Method of inspection and control of the reaction performance during the oxygen blowing process - Google Patents

Method of inspection and control of the reaction performance during the oxygen blowing process Download PDF

Info

Publication number
US3378366A
US3378366A US464145A US46414565A US3378366A US 3378366 A US3378366 A US 3378366A US 464145 A US464145 A US 464145A US 46414565 A US46414565 A US 46414565A US 3378366 A US3378366 A US 3378366A
Authority
US
United States
Prior art keywords
oxygen
blowing
conductivity
inspection
converter
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
US464145A
Other languages
English (en)
Inventor
Borowski Kurt
Maatsch Jurgen
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.)
Beteiligungs und Patentverwaltungs GmbH
Original Assignee
Beteiligungs und Patentverwaltungs 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 Beteiligungs und Patentverwaltungs GmbH filed Critical Beteiligungs und Patentverwaltungs GmbH
Application granted granted Critical
Publication of US3378366A publication Critical patent/US3378366A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4673—Measuring and sampling devices

Definitions

  • ABSTRACT 0F THE DISCLGSURE A method of inspection and control of the conditions prevailing in a converter during the oxygen blowing process of refining molten metal which includes the steps of positioning a single electrically conductive and insulated member in the converter spaced above the surface of the metal bath therein, passing an electric current through a closed circuit which includes the member, the atmosphere in the space between the surface of the metal bath and the member, the metal bath, and a wall of the converter, providing an electrical resistance between the member and ground of about 10 ohms to about 10,000 ohms, measuring the electric current passing through the circuit during the refining of the metal, and varying the conditions under which the refining of the metal in the converter takes place in accordance with the variations in the flow of electric current through the circuit as determined by the measurement.
  • the present invention relates to a method of inspection and control of the reaction performance during the oxygen blowing process.
  • the electric resistance of the insulation amounts to much less than 10,000 ohms, as for instance 10 ohms.
  • the apparatus capable of performing in accordance with the method of the present invention comprises a converter 1 of conventional structure, which is equipped with an upper mouth portion 3 through which a blowing tube 2 is inserted for blowing oxygen into the converter 1.
  • the blowing tube 2 is cooled and for this purpose the blowing tube 2 includes a jacket 4' forming the outer part of the blowing tube 2.
  • a feeding-in tube 4 leads into the jacket 4 and a feeding-off tube 5 leads off the jacket 4', so that cooling water is continuously fed through the jacket 4'.
  • An oxygen feeding tube 6 is disposed on top of the blowing tube 2 and communicates with the latter.
  • a moving slide 7 surrounds the blowing tube 2, which moving slide 7 is adapted to lift and lower, respectively, the blowing tube 2.
  • An electrical insulation ring 8 is disposed between the blowing tube 2 and the moving slide 7 for a purpose more clearly disclosed below.
  • An electric source 9 feeds electric current into a circuit comprising an electrical conduit 10 which has one terminal at the oxygen feeding tube 6 and another terminal at the outer face of the converter 1, so that the oxygen blowing tube 2 and the converter 1 are disposed in series in the electrical circuit.
  • the circuit includes a conductivity measuring device 11 which is disposed in series in said circuit and which conductivity measuring device is operatively connected with an indicating device 11' in order to indicate on a diagram the conductivity of the current through the metal bath to be processed.
  • the oxygen-blowing tube 2 used in the method of the present invention is electrically insulated from the remaining parts of the entire unit by means of the insulating ring 8.
  • the oxygen blowing tube 2 can also be grounded.
  • the electrical resistance should amount less than 10,000 ohms and may assume values of about 10 ohms.
  • the resistance of the cooling water and oxygen feeding tubes amounts to a multiple of this value in case non-n1etallic tubes are used.
  • the insulation of the oxygen blowing tube towards its supporting device and moving slide 7, respectively, or any other carrying means can be obtained by insertion of insulating layers between the blowing tube and its mounting, as for instance, by means of the insulation ring 8.
  • the present invention is not only applicable to a method performed in a LED-converter, but also in such decarburization methods in which the blowing of oxygen takes place on a rotating converter, for instance, in a Kaldoconverter rotating in an oblique position.
  • the conductivity between the blowing tube and the metal bath and the inner wall of the reaction vessel, which is connected for a good electrical conducting with a converter jacket as well as with the other parts of the unit is continuously determined and recorded.
  • two or more resistance measuring ranges capable of switching over, can be used, whereby the switching over from one range to another range-can be obtained automatically by any 3 -24 conventional means upon reaching a predetermined value.
  • the oxygen feeding tube Prior to the start of the blowing operation, by lowering the oxygen feeding tube to engagement with the bath surface, its height can be determined and, thereby, the distance between the blowing nozzle and the bath surface required for the process can be set exactly with distances required for the process, whereby the time of engagement is indicated by a strong change of the electric conductivity. If the oxygen feeding tube cannot be lowered as far or if an immersion of the tube should be avoided, the latter can be extended for a predetermined length by means of an electrically conducting extension member (not shown), which is electrically conducting with the oxygen feeding tube.
  • the conductivity between the blowing tube and the bath is determined during the blowing process in dependency of a series of influences.
  • An appreciable influence has the conductivity of the reaction gases rising from the bath and of the oxygen stream burning at a certain distance from the blower nozzle in which temperatures between 20003000 C. occur.
  • This conductivity is, for instance, a function of the quantity of reaction gases formed in the bath within a given time unit, which reaction gas quantity is proportional to the carbon loss.
  • the loading or" the gases with iron smoke and squirters, as well as the formation of a froth slag have their effect on the conductivity.
  • a voltage iscreated between the blowing tube and the bath depending upon the prevailing conditions, which voltage, for instance, varies strongly within the range of +0.1 to -0.1 volt.
  • the conductivity is also influenced by the metallurgical processes, by the apparatus, by the particular process and by the measuring method.
  • the presence of accompanying elements, for instance Si, which binds preferably the oxygen the carbon residue remains low as long as the accompanying elements are mostly slag. The more or less steep rise of the conductivity indicates clearly this metallurgical process.
  • the froth height can be measured also by a short-time lowering of the blowing tube before the slag reaches the blowing tube. From the changes of the conductivity capacity the formation of a froth slag can be early recognized, and metallurgical measures can be timely instituted in order to avoid an overfrothing and, thereby, a discharge bringing about losses for the process.
  • the resistance changes in metallurgically equal melts conform to a great extent and offer the possibility for an automatic inspection or control of the reaction procedure.
  • the method in accordance with the present invention can be performed also such that the conductivity between a particular probe and the bath surface is determined.
  • the probe must, of course, be electrically insulated and water cooled.
  • a method of inspection and control of the conditions prevailing in a converter during the oxygen blowing process of refining molten metal comprising the steps of positioning a single electrically conductive and insulated member in said converter spaced above the surface of the metal bath therein, passing an electric current through a closed circuit which includes said member, the atmosphere in the space between the surface of said metal bath and said member, said metal bath, and a wall of said converter, providing an electrical resistance between said member and ground of about 10 ohms to about 10,000 ohms,
  • a method of inspection and control of the conditions prevailing in a converter during the oxygen blowing process of refining molten metal comprising the steps of positioning a single electrically conductive and insulated member in said converter spaced above the surface of the metal bath therein,

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
US464145A 1964-03-23 1965-06-15 Method of inspection and control of the reaction performance during the oxygen blowing process Expired - Lifetime US3378366A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEB76045A DE1290557B (de) 1964-03-23 1964-03-23 Verfahren zur UEberwachung und Steuerung des Reaktionsablaufes bei Sauerstoffaufblaseverfahren
DEB77404A DE1299671B (de) 1964-03-23 1964-06-25 Verfahren zur UEberwachung und Steuerung des Reaktionsablaufes beim Sauerstoffaufblaseverfahren

Publications (1)

Publication Number Publication Date
US3378366A true US3378366A (en) 1968-04-16

Family

ID=25966997

Family Applications (1)

Application Number Title Priority Date Filing Date
US464145A Expired - Lifetime US3378366A (en) 1964-03-23 1965-06-15 Method of inspection and control of the reaction performance during the oxygen blowing process

Country Status (9)

Country Link
US (1) US3378366A (enrdf_load_stackoverflow)
AT (1) AT266891B (enrdf_load_stackoverflow)
BE (1) BE661460A (enrdf_load_stackoverflow)
DE (2) DE1290557B (enrdf_load_stackoverflow)
ES (1) ES310759A1 (enrdf_load_stackoverflow)
FR (1) FR1426777A (enrdf_load_stackoverflow)
GB (1) GB1044644A (enrdf_load_stackoverflow)
LU (1) LU48232A1 (enrdf_load_stackoverflow)
NL (1) NL6503611A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505062A (en) * 1965-10-24 1970-04-07 Allegheny Ludlum Steel Method for positioning an oxygen lance
US3610601A (en) * 1969-10-01 1971-10-05 Allegheny Ludlum Steel Apparatus for positioning a consumable lance
US3663204A (en) * 1969-04-15 1972-05-16 Voest Ag Method of measuring the thickness of a slag layer on metal baths
US3701518A (en) * 1969-10-03 1972-10-31 Berry Metal Co Oxygen lance control arrangement for basic oxygen furnace
FR2443509A1 (fr) * 1978-12-05 1980-07-04 Kawasaki Steel Co Procedes de reglage de soufflage d'oxygene, de reglage de la formation de laitier et de prediction des projections lors de la mise en oeuvre du procede l-d
US5310166A (en) * 1991-08-23 1994-05-10 Noranda, Inc. Self-cooling lance or tuyere
US10126286B2 (en) 2013-03-25 2018-11-13 Voestalpine Stahl Gmbh Lance and method for determining reaction data of the course of a reaction

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8108175A (en) * 1974-05-13 1976-11-18 Broken Hill Pty Co Ltd Receptacles
DE2924791C2 (de) * 1979-06-20 1982-09-30 Ferrotron Elektronik Gmbh, 4030 Ratingen Verfahren und Vorrichtung zur Ermittlung der Gehaltean Schwermetalloxiden in flüssigen Schlacken
DE2937353C2 (de) * 1979-09-13 1983-04-07 Gustav 5870 Hemer Kolb Vorrichtung zur Teufenmessung der Oberfläche eines Metallbades in Schmelzgefäßen
DE3110569A1 (de) * 1981-03-18 1982-12-30 Skw Trostberg Ag, 8223 Trostberg Verfahren zur verhinderung des ueberschaeumens beim frischen von roheisen sowie zur erniedrigung des phosphorgehaltes, mittel und vorrichtung zur durchfuehrung des verfahrens
USD608647S1 (en) 2008-06-05 2010-01-26 Colgate-Palmolive Co. Container
USD615869S1 (en) 2009-06-09 2010-05-18 Colgate-Palmolive Company Container
USD630517S1 (en) 2009-06-09 2011-01-11 Colgate-Palmolive Company Container
USD616308S1 (en) 2009-06-09 2010-05-25 Colgate-Palmolive Company Container

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE635307A (enrdf_load_stackoverflow) *
GB900061A (en) * 1959-11-25 1962-07-04 Salzgitter Huettenwerk Ag Lance for blowing gases, particularly gaseous oxygen and mixtures of gas and solids on or into metal baths
GB933414A (en) * 1961-06-02 1963-08-08 Richard Thomas & Baldwins Ltd Improvements relating to the production of steel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE376363C (de) * 1923-05-28 Ernst Herbert Kuehne Anzeigevorrichtung fuer Schmelzoefen
AT183095B (de) * 1953-03-25 1955-09-10 Voest Ag Vorrichtung zum Verblasen von Roheisen mit Sauerstoff
US2803534A (en) * 1954-08-07 1957-08-20 Oesterr Alpine Montan Process for the production of steel
FR1133958A (fr) * 1955-06-17 1957-04-04 Mannesmann Ag Procédé de fabrication d'acier
AT201088B (de) * 1956-08-30 1958-12-10 Huettenwerk Oberhausen Ag Verfahren zum Frischen von Metallbädern in einem sich drehenden Trommelofen
AT234127B (de) * 1962-07-25 1964-06-10 Bot Brassert Oxygen Technik Ag Verfahren zur Betriebsregelung von Blasverfahren in Abhängigkeit vom Schäumungsgrad der Schlacke
FR1345757A (fr) * 1962-11-02 1963-12-13 Siderurgie Fse Inst Rech Procédé et dispositif de réglage de la hauteur d'une lance d'affinage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE635307A (enrdf_load_stackoverflow) *
GB900061A (en) * 1959-11-25 1962-07-04 Salzgitter Huettenwerk Ag Lance for blowing gases, particularly gaseous oxygen and mixtures of gas and solids on or into metal baths
GB933414A (en) * 1961-06-02 1963-08-08 Richard Thomas & Baldwins Ltd Improvements relating to the production of steel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505062A (en) * 1965-10-24 1970-04-07 Allegheny Ludlum Steel Method for positioning an oxygen lance
US3663204A (en) * 1969-04-15 1972-05-16 Voest Ag Method of measuring the thickness of a slag layer on metal baths
US3610601A (en) * 1969-10-01 1971-10-05 Allegheny Ludlum Steel Apparatus for positioning a consumable lance
US3701518A (en) * 1969-10-03 1972-10-31 Berry Metal Co Oxygen lance control arrangement for basic oxygen furnace
FR2443509A1 (fr) * 1978-12-05 1980-07-04 Kawasaki Steel Co Procedes de reglage de soufflage d'oxygene, de reglage de la formation de laitier et de prediction des projections lors de la mise en oeuvre du procede l-d
US5310166A (en) * 1991-08-23 1994-05-10 Noranda, Inc. Self-cooling lance or tuyere
US10126286B2 (en) 2013-03-25 2018-11-13 Voestalpine Stahl Gmbh Lance and method for determining reaction data of the course of a reaction

Also Published As

Publication number Publication date
AT266891B (de) 1968-12-10
ES310759A1 (es) 1965-06-01
LU48232A1 (enrdf_load_stackoverflow) 1965-05-20
GB1044644A (en) 1966-10-05
BE661460A (enrdf_load_stackoverflow) 1965-07-16
FR1426777A (fr) 1966-01-28
NL6503611A (enrdf_load_stackoverflow) 1965-09-24
DE1290557B (de) 1969-03-13
DE1299671B (de) 1969-07-24

Similar Documents

Publication Publication Date Title
US3378366A (en) Method of inspection and control of the reaction performance during the oxygen blowing process
US4442706A (en) Probe and a system for detecting wear of refractory wall
US3080755A (en) Metallurgical process control
US3610601A (en) Apparatus for positioning a consumable lance
US3374122A (en) Expendable immersion thermocouple including weight
US11959813B2 (en) Device and method for measuring a temperature of a molten metal
US3161499A (en) Metallurgical process control
JP2018178209A (ja) 傾動型精錬装置及び傾動排滓方法
US3505062A (en) Method for positioning an oxygen lance
US3396960A (en) Method of and apparatus for inspection and control of the reaction performance during the oxygen blowing process
DE3068798D1 (en) System for measuring the height of the slag in a metallurgical vessel, and for determining its physical condition
US3672222A (en) Instrument lance for basic oxygen steelmaking furnace
KR100399238B1 (ko) 전로용 서브랜스 복합프로브 및 그 측정방법
US3347099A (en) Molten bath temperature measurement
US3766772A (en) Apparatus for controlling metallurgical processes
CA2925349C (en) Measurement of electrical variables on a dc furnace
US3896674A (en) Sensor probe control system
US4223442A (en) Distance measurement
US5650117A (en) Slag detecting apparatus and method
CA1108269A (en) Molten metal level indication in receptacles
US3669645A (en) Method for operating an oxygen top-blowing converter
JPS5837478A (ja) 金属溶湯の湯面検知装置
EP2554955A1 (en) Method and apparatus for measuring liquid metal height and the thickness of a slag layer in a metallurgical vessel
JP2003155508A (ja) 高炉炉底電位差測定装置及び高炉内の銑滓レベル評価方法
WO2013014271A1 (en) Method and apparatus for measuring liquid metal height and the thickness of a slag layer in a metallurgical vessel