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Sugikawa, Susumu; Maeda, Mitsuru; Tsujino, Takeshi.
Japan Atomic Energy Research Inst., Tokyo1978
Japan Atomic Energy Research Inst., Tokyo1978
AbstractAbstract
[en] Purpose: To easily gasify spent contaminated moderators and the like of a graphite-moderated reactor with CO2. Method: Graphite is dipped in an aqueous solution of nitrate of a gasifying catalyst using as a solvent nitric acid. For example, when a graphite block or compact is dipped in a catalyst solution consisting of 1 to 14M of HNO3 and 0.22M of Fe(NO3)3 at a temperature in the range of from 20 to 900C for one to five hours, 400 to 2000 ppm of iron is added up to the central part of graphite. After graphite has been dried, 100% of CO or N2 is caused to flow into the solution at 850 to 10000C for about 30 minutes to activate the catalyst. As a consequence, the gasifying catalyst is uniformly added to graphite, whereby it is possible to increase the gasification velocity of graphite with CO2 at a temperature in the range of 850 to 10000C. (Nakamura, S.)
Primary Subject
Source
22 Sep 1978; 4 p; JP PATENT DOCUMENT 53-109098/A/; Available from JAPATIC. Also available from INPADOC
Record Type
Patent
Country of publication
CARBON, CARBON COMPOUNDS, CARBON OXIDES, CHALCOGENIDES, CHEMICAL REACTIONS, COBALT COMPOUNDS, DECOMPOSITION, DISPERSIONS, ELEMENTS, GAS COOLED REACTORS, GRAPHITE MODERATED REACTORS, HOMOGENEOUS MIXTURES, HYDROGEN COMPOUNDS, INORGANIC ACIDS, IRON COMPOUNDS, MIXTURES, NICKEL COMPOUNDS, NITRATES, NITROGEN COMPOUNDS, NONMETALS, NUCLEAR FACILITIES, OXIDES, OXYGEN COMPOUNDS, REACTORS, SOLUTIONS, TRANSITION ELEMENT COMPOUNDS
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