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Title: Low temperature vapor phase digestion of graphite

A method for digestion and gasification of graphite for removal from an underlying surface is described. The method can be utilized to remove graphite remnants of a formation process from the formed metal piece in a cleaning process. The method can be particularly beneficial in cleaning castings formed with graphite molding materials. The method can utilize vaporous nitric acid (HNO.sub.3) or vaporous HNO.sub.3 with air/oxygen to digest the graphite at conditions that can avoid damage to the underlying surface.
Inventors:
Issue Date:
OSTI Identifier:
1351887
Assignee:
Savannah River Nuclear Solutions, LLC SRS
Patent Number(s):
9,623,371
Application Number:
14/867,644
Contract Number:
AC09-08SR22470
Resource Relation:
Patent File Date: 2015 Sep 28
Research Org:
Savannah River Site (SRS), Aiken, SC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Other works cited in this record:

Manufacture of Mellitic Acid
patent, October 1939

Alternate Oxidation and Reduction of Carbon
patent, July 1950

Molding Composition and Process for Producing Same
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Composition and Process for Removing Heat Scale from Metal Parts
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Chemical Cleaning of Metal Surfaces Employing Steam
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Chemical Disintegration and Recovery of Uranium from Sintered Graphite-Uranium Compacts
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Process for a gasification of graphite
patent, October 1980

Apparatus for cooling a continuous casting mold
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Catalyzed electrochemical gasification of carbonaceous materials at anode and production of hydrogen at cathode
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Heat-aided method for separating the graphite matrix from the nuclear fuel of nuclear reactor fuel elements
patent, March 1985

Diamond crystal growth process
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Method and apparatus for descaling metal strip
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Process for the separation of carbon nanotubes from graphite
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Controlled oxidation of graphite to graphene oxide with novel oxidants in a bulk scale
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A highly efficient gas-phase route for the oxygen functionalization of carbon nanotubes based on nitric acid vapor
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Interaction of graphite with hydroxide-salt melts
journal, April 2006
  • Zarubitskii, O. G.; Dmitruk, B. F.; Zakharchenko, N. F.
  • Russian Journal of Applied Chemistry, Vol. 79, Issue 4, p. 525-528
  • DOI: 10.1134/S1070427206040033

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