Preparation of mineral matrices by cold crucible induction melting
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United States of America Patent
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Aug 20, 2002
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N/A
app pub date -
Jul 15, 1999
filing date -
Jul 16, 1998
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Abstract
The aim of the present invention is a process for preparing a mineral matrix by melting, which is implemented according to the method of direct cold crucible induction melting. The method employs a step for initiating the melting. During the initiation step, a conductive mineral load is generated, by introduction of constituent elements of the matrix, into a bath of a conductive liquid, brought by induction to a suitable temperature, in the cold crucible. The intervening conductive liquid has the property of being a liquid and an electric conductor at a temperature between .theta..sub.1 of less than 600.degree. C., advantageously of between 100 and 500.degree. C., and a temperature .theta..sub.2 at least equal to the temperature at which the constituent elements of the matrix melt to generate the matrix. The conductive liquid is advantageously a molten sodium hydroxide bath. The preparation of such a glass matrix is advantageously implemented within the context of a method of vitrifying radioactive waste materials.
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