EP0992597B1 - Désoxidation du cuivre fondu moyennant un mélange gazeux d'hydrogène et d'azote - Google Patents

Désoxidation du cuivre fondu moyennant un mélange gazeux d'hydrogène et d'azote Download PDF

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Publication number
EP0992597B1
EP0992597B1 EP99119000A EP99119000A EP0992597B1 EP 0992597 B1 EP0992597 B1 EP 0992597B1 EP 99119000 A EP99119000 A EP 99119000A EP 99119000 A EP99119000 A EP 99119000A EP 0992597 B1 EP0992597 B1 EP 0992597B1
Authority
EP
European Patent Office
Prior art keywords
hydrogen
copper
melt
der
nitrogen
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
EP99119000A
Other languages
German (de)
English (en)
Other versions
EP0992597A1 (fr
Inventor
Karl Fasshauer
Frank Steffner
Hans-Joachim Dauterstedt
Michael Albrecht
Eberhard Wernicke
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.)
Linde GmbH
Original Assignee
Linde GmbH
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Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Publication of EP0992597A1 publication Critical patent/EP0992597A1/fr
Application granted granted Critical
Publication of EP0992597B1 publication Critical patent/EP0992597B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/0028—Smelting or converting
    • C22B15/0052—Reduction smelting or converting
    • 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
    • C22B15/00—Obtaining copper
    • C22B15/0026—Pyrometallurgy
    • C22B15/006—Pyrometallurgy working up of molten copper, e.g. refining
    • 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
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Definitions

  • the invention relates to a process for polishing (deoxidizing) copper in molten liquid State in which a gaseous deoxidizer is passed into the melt becomes.
  • the last process step before casting is a reduction in the molten copper bath.
  • the technical term for this process stage is Poland.
  • the reducing agent used (various feedstocks) primarily has the task of reducing the oxygen content to a certain final size and expelling sulfur dioxide in the copper bath.
  • the technology currently used provides for the use of hardwood trunks that are pressed into the liquid copper bath using a crane. The very intensive reactions of the wood with the melt that occur bring about a reduction in the oxygen component and - if present - the sulfur dioxide component. It is always of the utmost importance that the most important, harmful additives have been slagged before the reduction process begins and that the surface of the bath has been removed cleanly.
  • Polishing with CH 4 in anode operation was and is problematic because a very important requirement, the high starting temperature of the oxidized anode copper, can only be achieved with great effort.
  • natural gas poling could often be introduced at least as a partial process, particularly in the remelting work for the production of wire bars. Because the leading material was of cathode quality, the temperatures of approx. 1,250 ° C were reached even without major energy losses, which then allowed natural gas poling with two lances economically.
  • the technological conditions provided, with an oxygen content of approximately 800-1,000 ppm, to continue the pole process with logs until the end, because the O 2 removal at these contents is quick and the sampling and O 2 determinations did not cumulate ,
  • the reducing agent cannot react directly with the oxygen in the copper, it must first be broken down into reactive components (CO / H 2 ), which can, however, only be achieved by supplying energy. Therefore, the considerations were made to use a gas as a reducing agent, which is already a reducing agent and supplies the process with energy through its "combustion". The use of hydrogen for this purpose has therefore already been proposed.
  • Injection device or pole for H 2 addition 3/4 "gas pipe was used as the outer jacket, into which an approx. 3/8" pipe was inserted. Since the gas flow should flow through the inner pipe, both gas pipes were welded to the threaded head piece. The pipe length of the pollanze was 3 m. The lower part was thermally protected from plastic fabric combined with fireclay mortar and soda water glass. A pulpy mixture was produced from both components and pulled evenly, spirally over the outer tube via a spindle with a roller seat for the absorption of the tissue. The lance was covered at the lower end with a length of approx. 1.5 m.
  • GB-A-22 25 024 discloses a generic method for polishing copper, in which a hydrogen / inert gas mixture with a Hydrogen content between 0.5 and 50 vol% is used. Furthermore, the US-A-3 844 772 another generic method for polishing copper, in which ammonia cracked as deoxidation gas is used.
  • the object of the present invention is an easy to carry out Functional and effective deoxidation process based on gaseous Specify treatment agents.
  • this is achieved in that a mixture of as reducing agent Hydrogen and nitrogen are used in a volume ratio of 60 to 40 to 72 to 28 and that in the furnace room a deoxidizing atmosphere by appropriate Setting the stove heating, d. H. the heating burner, to an air ratio of 0.5 to 0.8 is observed.
  • the flow rate per lance (H 2 / N 2 mixture) is advantageously in the range from 200 to 350 m 3 N / h and lance.
  • the ratio of the amount of hydrogen in m 3 N / batch of theoretical consumption to actual consumption results in utilization rates from 077 to greater than 1 (!). Due to this fact, it is likely that the swirling up of the copper bath in the immersion area of the pollances by the flame gases of the natural gas / oxygen furnace will result in a further, noteworthy reduction . In the example cases, an air ratio of ⁇ ⁇ 0.6 was maintained for furnace heating. Compared to Tru with natural gas, the use of H 2 / N 2 mixture> 60/40 vol.% And the described atmospheric ratios increases the degree of energy efficiency by a factor of two.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • ing And Chemical Polishing (AREA)
  • Electrolytic Production Of Metals (AREA)

Claims (4)

  1. Procédé pour le perchage (la désoxydation) du cuivre à l'état fondu, dans lequel un agent réducteur gazeux est introduit dans le bain, caractérisé en ce que l'on utilise comme agent réducteur un mélange d'hydrogène et d'azote avec un rapport en volume de 60 à 40 jusqu'à 72 à 28 et en ce que l'on maintient dans la chambre du four une atmosphère désoxydante par le réglage correspondant du chauffage du four, c'est-à-dire des brûleurs de chauffage, à un coefficient d'air de 0,5 à 0,8.
  2. Procédé suivant la revendication 1, caractérisé en ce que l'on introduit l'agent réducteur gazeux dans et sur le bain et en ce que l'on produit ainsi au moins une partie de l'atmosphère réductrice au-dessus du bain.
  3. Procédé suivant la revendication 1 ou 2, caractérisé en ce que, dans le cas de lances tubulaires, on introduit le gaz réducteur dans le bain avec des pressions d'alimentation de 5 à 15 bar, de préférence de 8 à 12 bar.
  4. Procédé suivant la revendication 3, caractérisé en ce que, dans le cas de lances tubulaires, on règle le débit par lance (mélange H2/N2) dans la gamme de 200 à 350 m3N/h, les sections transversales de sortie des lances étant maintenues de 1 à 1,5 * 10-4 m2 (= cm2).
EP99119000A 1998-09-29 1999-09-27 Désoxidation du cuivre fondu moyennant un mélange gazeux d'hydrogène et d'azote Expired - Lifetime EP0992597B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19844667A DE19844667A1 (de) 1998-09-29 1998-09-29 Verfahren zum Polen von Kupfer
DE19844667 1998-09-29

Publications (2)

Publication Number Publication Date
EP0992597A1 EP0992597A1 (fr) 2000-04-12
EP0992597B1 true EP0992597B1 (fr) 2002-07-24

Family

ID=7882666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99119000A Expired - Lifetime EP0992597B1 (fr) 1998-09-29 1999-09-27 Désoxidation du cuivre fondu moyennant un mélange gazeux d'hydrogène et d'azote

Country Status (4)

Country Link
EP (1) EP0992597B1 (fr)
AT (1) ATE221135T1 (fr)
DE (2) DE19844667A1 (fr)
ES (1) ES2180245T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10007441A1 (de) * 2000-02-18 2001-08-23 Linde Gas Ag Verfahren zum Polen von Kupfer
DE10035593A1 (de) * 2000-07-21 2002-01-31 Norddeutsche Affinerie Verfahren und Vorrichtung zur Verminderung des Sauerstoffgehaltes einer Kupferschmelze
CN100462455C (zh) * 2007-08-24 2009-02-18 云南铜业压铸科技有限公司 一种熔炼纯铜或高含铜合金原料的方法
DE102022122729A1 (de) 2022-09-07 2024-03-07 Sms Group Gmbh Vorrichtung zur Kupferproduktion mit verbesserter CO2-Billanz

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1919850B2 (de) * 1969-04-18 1971-08-19 Verfahren zur desoxydation geschmolzenen metalle mittels reformierungsgas und vorrichtung zur durchfuehrung des verfahrens
US3529956A (en) * 1969-06-03 1970-09-22 Anaconda Co Refining copper
US3844772A (en) * 1973-02-28 1974-10-29 Du Pont Deoxidation of copper
US3987224A (en) * 1975-06-02 1976-10-19 General Electric Company Oxygen control in continuous metal casting system
BE839754A (fr) * 1976-03-18 1976-09-20 Procede et dispositif pour affiner un bain metallique
JP2689540B2 (ja) * 1988-11-21 1997-12-10 三菱マテリアル株式会社 低酸素含有銅の製造方法及び製造装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8030082B2 (en) 2006-01-13 2011-10-04 Honeywell International Inc. Liquid-particle analysis of metal materials

Also Published As

Publication number Publication date
DE19844667A1 (de) 2000-03-30
ATE221135T1 (de) 2002-08-15
ES2180245T3 (es) 2003-02-01
EP0992597A1 (fr) 2000-04-12
DE59902099D1 (de) 2002-08-29

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