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EP0145799B1 - Procédé pour éliminer à l'aide d'une oxydation les particules de carbone contaminées par des substances nocives - Google Patents

Procédé pour éliminer à l'aide d'une oxydation les particules de carbone contaminées par des substances nocives Download PDF

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Publication number
EP0145799B1
EP0145799B1 EP19830112508 EP83112508A EP0145799B1 EP 0145799 B1 EP0145799 B1 EP 0145799B1 EP 19830112508 EP19830112508 EP 19830112508 EP 83112508 A EP83112508 A EP 83112508A EP 0145799 B1 EP0145799 B1 EP 0145799B1
Authority
EP
European Patent Office
Prior art keywords
acid
sulfuric acid
paste
carbon particles
suspension
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
Application number
EP19830112508
Other languages
German (de)
English (en)
Other versions
EP0145799A1 (fr
Inventor
Herbert Dr. Wieczorek
Bernhard Oser
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Kernforschungszentrum Karlsruhe 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 Kernforschungszentrum Karlsruhe GmbH filed Critical Kernforschungszentrum Karlsruhe GmbH
Priority to DE8383112508T priority Critical patent/DE3375051D1/de
Priority to EP19830112508 priority patent/EP0145799B1/fr
Publication of EP0145799A1 publication Critical patent/EP0145799A1/fr
Application granted granted Critical
Publication of EP0145799B1 publication Critical patent/EP0145799B1/fr
Expired legal-status Critical Current

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

Definitions

  • the invention relates to a method for the virtually complete removal of carbon particles contaminated with pollutants and difficult to handle carbon powders with the aid of oxidation. which uses an acid mixture of sulfuric acid and nitric acid at elevated temperatures, after the oxidation the acid mixture is separated from the resulting insoluble residue and recycled.
  • thorium-containing graphite in the form of soot is produced as waste. Its bulk density is very low, less than 0.1 g per cm 3 . Because of the thorium and its derived products, this waste cannot be treated like ordinary domestic or industrial waste material. The thorium-containing graphite carbon black is difficult to handle due to its low bulk density and causes high storage costs.
  • the invention has for its object to provide a simple method for removing contaminated carbon particles, with which powders can be treated, which are difficult to handle due to their small particle size and / or their low bulk density.
  • a practically complete oxidation of the carbon particles and a reduction in the volume to be eliminated to the volume of a pollutant residue which cannot be further oxidized should be possible.
  • the process should be able to remove activated carbon loaded with inactive pollutants or radionuclides, but also graphite soot containing thorium.
  • pollutants are to be understood as harmful, in particular toxic, inorganic and organic compounds and radionuclides or their compounds that are harmful to the biocycle.
  • This paste was then treated according to example 1.
  • the oxidation of the carbon black was the same with regard to the quality and quantity of the products and the reaction time as when using a pure sulfuric acid to prepare the paste.
  • Example 2 As described in Example 1, 10 g of thorium-containing graphite carbon black were mixed with 10 ml of sulfuric acid to form a paste, which was then introduced into 250 ml of sulfuric acid heated to 200.degree. At the same time, 65% by weight nitric acid was added at a metering rate of approximately 2.4 ml / min. added below the surface of the sulfuric acid. After a reaction time of 100 minutes and a corresponding consumption of 240 ml of HNO 3 , the complete oxidation of the graphite was observed, ie the acid had become clear again. The test result was the same as in Example 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Processing Of Solid Wastes (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Claims (5)

1. Procédé pour l'élimination pratiquement complète de particules de carbone chargées de substances nocives et de poussières de carbone difficiles à manipuler, à l'aide d'une oxydation, dans lequel on utilise un mélange acide, d'acide sulfurique et d'acide nitrique, à température élevée, sépare, après l'oxydation, le mélange d'acides du résidu insoluble qui s'est formé et le recycle, procédé caractérisé par les étapes d'opération suivantes:
a) mélanger, en agitant, les particules de carbone avec l'acide sulfurique à la température ambiante, en une masse de consistance pâteuse ou en une suspension fluide,
b) introduite la pâte ou la suspension dans de l'acide sulfurique chauffé à 150 à 250°C avec injection simultanèe d'acide nitrique sous la surface de l'acide sulfurique,
c) evacuer les gaz et vapeurs qui se forment, et condenser les parties constituantes conderisables, le condensat étant utilisé, sans autre traitement, pour la préparation de la pâte ou de la suspension,
d) séparation des matières solides résiduelles, et retour des acides dans le procédé pour la préparation de la pâte ou de la suspension.
EP19830112508 1983-12-13 1983-12-13 Procédé pour éliminer à l'aide d'une oxydation les particules de carbone contaminées par des substances nocives Expired EP0145799B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8383112508T DE3375051D1 (en) 1983-12-13 1983-12-13 Process for the oxidative disposal of carbon particles contaminated by noxious material
EP19830112508 EP0145799B1 (fr) 1983-12-13 1983-12-13 Procédé pour éliminer à l'aide d'une oxydation les particules de carbone contaminées par des substances nocives

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830112508 EP0145799B1 (fr) 1983-12-13 1983-12-13 Procédé pour éliminer à l'aide d'une oxydation les particules de carbone contaminées par des substances nocives

Publications (2)

Publication Number Publication Date
EP0145799A1 EP0145799A1 (fr) 1985-06-26
EP0145799B1 true EP0145799B1 (fr) 1987-12-23

Family

ID=8190870

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830112508 Expired EP0145799B1 (fr) 1983-12-13 1983-12-13 Procédé pour éliminer à l'aide d'une oxydation les particules de carbone contaminées par des substances nocives

Country Status (2)

Country Link
EP (1) EP0145799B1 (fr)
DE (1) DE3375051D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3642841A1 (de) * 1986-12-16 1988-06-30 Kernforschungsz Karlsruhe Verfahren zur wiederaufbereitung von mit neutronen bestrahltem borcarbid aus trimm- oder abschalt-elementen aus atomkernreaktoren
IT1244763B (it) * 1991-03-08 1994-08-08 Enichem Sintesi Procedimento di demolizione ossidativa per lo smaltimento di sostanze organiche tossiche
WO1997013137A2 (fr) * 1995-10-03 1997-04-10 Cem Corporation Processus chimiques stimules par hyperfrequences
UA57884C2 (uk) * 1999-10-14 2003-07-15 Дейвід БРЕДБЕРІ Спосіб обробки радіоактивного графіту
RU2192057C1 (ru) * 2001-06-28 2002-10-27 Московское государственное предприятие - объединенный эколого-технологический и научно-исследовательский центр по обезвреживанию РАО и охране окружающей среды Способ переработки отходов реакторного графита и устройство для его реализации
FR2984583A1 (fr) * 2011-12-16 2013-06-21 Electricite De France Traitement de dechets radioactifs carbones comportant du chlore.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT267009B (de) * 1966-04-12 1968-12-10 Oesterr Studien Atomenergie Verfahren zum Zerlegen von Graphitkörpern, insbesondere zum Zerlegen von Brennstoffeinsätzen für Kernreaktoren

Also Published As

Publication number Publication date
EP0145799A1 (fr) 1985-06-26
DE3375051D1 (en) 1988-02-04

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