WO1997022975A2 - Procede d'utilisation de pieces metalliques contaminees - Google Patents

Procede d'utilisation de pieces metalliques contaminees Download PDF

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Publication number
WO1997022975A2
WO1997022975A2 PCT/DE1996/002309 DE9602309W WO9722975A2 WO 1997022975 A2 WO1997022975 A2 WO 1997022975A2 DE 9602309 W DE9602309 W DE 9602309W WO 9722975 A2 WO9722975 A2 WO 9722975A2
Authority
WO
WIPO (PCT)
Prior art keywords
slag
melt
metal parts
separated
liquid
Prior art date
Application number
PCT/DE1996/002309
Other languages
German (de)
English (en)
Other versions
WO1997022975A3 (fr
Inventor
Ernst Haas
Nikolaus Neudert
Roland Hofmann
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to AU18681/97A priority Critical patent/AU1868197A/en
Publication of WO1997022975A2 publication Critical patent/WO1997022975A2/fr
Publication of WO1997022975A3 publication Critical patent/WO1997022975A3/fr

Links

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/28—Treating solids
    • G21F9/30—Processing
    • 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
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/001—Dry processes
    • 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
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • 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

  • the invention relates to a method for recycling metal parts which are radioactively contaminated, the metal parts being melted and a slag former being added, thereby forming a liquid melt and a slag which is then separated from the melt.
  • scrap contaminated, metallic, in particular iron-containing, scrap which must be recycled or disposed of. It is common to subject this scrap to melt decontamination.
  • the scrap is e.g. radioactively contaminated by ⁇ -emitters such as uranium, thorium, transurans and / or alkaline earth metals.
  • a method comprising melt decontamination is known from DE 33 18 377 AI. This process provides that the contaminated metal is melted. A slag former or slagging agent is then added to the melt. Then a slag forms that floats on the melt. Since the solubility of the substances which caused the radioactive contamination of the metal parts in the slag is greater than in the melt, the majority of the substances get into the slag. This results in a melt with a significantly reduced admixture of these substances. After it can no longer absorb any substances, the slag can be drawn off from the surface of the melt, and the melt which has been decontaminated as far as possible remains. The volume of the slag is only a small part of the total volume of the melt and slag.
  • the invention is based on the object of specifying a method for recycling radioactive contaminated metal parts which frees the metal parts even more than before from the substances which have caused their radioactive contamination.
  • the object is achieved according to the invention in that after the slag has been separated off, as long as the melt is still liquid, slag formers are again added to the liquid melt, and then the slag which is formed again is separated from the melt.
  • the process according to the invention is thus characterized in that a second addition of slag former and a second separation of slag follow a first addition of slag former and a first separation of slag in two stages.
  • the process according to the invention achieves the advantage that the melt remaining after the process has been carried out and thus also the shaped bodies formed from the melt contain significantly fewer residues of radioactive substances than was previously customary after melt decontamination.
  • the remaining melt and thus the shaped pieces formed from it can advantageously be used largely without restrictions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un procédé d'utilisation de pièces métalliques qui ont été contaminées radioactivement. Selon ledit procédé, on fait fondre les pièces métalliques et on ajoute un fondant de scorification pour obtenir une masse fondue liquide et des scories. Les scories sont ensuite séparées de la masse fondue. Ce procédé se caractérise en ce qu'après séparation des scories, un fondant de scorification est ajouté de nouveau à la masse fondue, aussi longtemps qu'elle est encore liquide, et en ce que les scories ainsi formées sont de nouveau séparées de la masse fondue.
PCT/DE1996/002309 1995-12-18 1996-12-02 Procede d'utilisation de pieces metalliques contaminees WO1997022975A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU18681/97A AU1868197A (en) 1995-12-18 1996-12-02 Process for using contaminated metal parts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995147298 DE19547298A1 (de) 1995-12-18 1995-12-18 Verfahren zur Verwertung kontaminierter Metallteile
DE19547298.5 1995-12-18

Publications (2)

Publication Number Publication Date
WO1997022975A2 true WO1997022975A2 (fr) 1997-06-26
WO1997022975A3 WO1997022975A3 (fr) 1997-08-14

Family

ID=7780483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1996/002309 WO1997022975A2 (fr) 1995-12-18 1996-12-02 Procede d'utilisation de pieces metalliques contaminees

Country Status (4)

Country Link
AU (1) AU1868197A (fr)
DE (1) DE19547298A1 (fr)
WO (1) WO1997022975A2 (fr)
ZA (1) ZA9610579B (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2546332A1 (fr) * 1983-05-20 1984-11-23 Wiederaufarbeitung Von Kernbre Procede de decontamination de mitraille de fer et/ou d'acier contaminee par radioactivite
GB2272566A (en) * 1992-11-17 1994-05-18 Clyde Shaw Ltd Decontamination Method
EP0714103A1 (fr) * 1994-11-25 1996-05-29 Doryokuro Kakunenryo Kaihatsu Jigyodan Méthode pour décontaminer par fusion un métal contaminé par une substance radioactive
FR2730091A1 (fr) * 1995-02-01 1996-08-02 Commissariat Energie Atomique Decontamination de zircaloy a l'aide d'un laitier par une operation de fusion en creuset froid avec tirage continu du lingot

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60129698A (ja) * 1983-12-19 1985-07-10 株式会社日立製作所 放射能汚染金属の溶融除染法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2546332A1 (fr) * 1983-05-20 1984-11-23 Wiederaufarbeitung Von Kernbre Procede de decontamination de mitraille de fer et/ou d'acier contaminee par radioactivite
GB2272566A (en) * 1992-11-17 1994-05-18 Clyde Shaw Ltd Decontamination Method
EP0714103A1 (fr) * 1994-11-25 1996-05-29 Doryokuro Kakunenryo Kaihatsu Jigyodan Méthode pour décontaminer par fusion un métal contaminé par une substance radioactive
FR2730091A1 (fr) * 1995-02-01 1996-08-02 Commissariat Energie Atomique Decontamination de zircaloy a l'aide d'un laitier par une operation de fusion en creuset froid avec tirage continu du lingot

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE INSPEC INSTITUTE OF ELECTRICAL ENGINEERS, STEVENAGE, GB Inspec No. an 2154351, XP002032359 & NUCL. CHEM. WASTE MANAGE. , Bd. 4, Nr. 2, 1993, UK, Seiten 129-134, HESHMATPOUR: "decontamination of transuranic contaminated metals by melt refining" *
DATABASE WPI Week 8534 Derwent Publications Ltd., London, GB; AN 85-206156 XP002032360 & JP 60 129 698 A (HITACHI) , 10.Juli 1985 *

Also Published As

Publication number Publication date
ZA9610579B (en) 1997-06-18
WO1997022975A3 (fr) 1997-08-14
AU1868197A (en) 1997-07-14
DE19547298A1 (de) 1997-06-19

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