Radioactive Wastes

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carried out with the same equipment: evaporation of the
waste solution mixed with the

1) borosilicate: any of several salts derived from both boric acid and
silicic acid and found in certain minerals such as tourmaline.

additives necesary for the production of borosilicate glass, calcination
and elaboration of the glass. These operations are carried out in a
metallic pot that is heated in an induction furnace. The vitrification of
one load of wastes comprises of the following stages. The first step is
'Feeding'. In this step the vitrification receives a constant flow of
mixture of wastes and of additives until it is 80% full of calcine. The
feeding rate and heating power are adjusted so that an aqueous phase of
several litres is permanently maintained at the surface of the pot. The
second step is the 'Calcination and glass evaporation'. In this step when
the pot is practically full of calcine, the temperature is progressively
increased up to 1100 to 1500 C and then is maintained ...

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ventilators provide air circulation to cool down glass.
The glass produced has the advantage of being stored as solid rather
than liquid. The advantages of the solids are that they have almost
complete insolubility, chemical inertias, absence of volatile products and
good radiation resistance. The ruthenium that escapes is absorbed by a
filter. The amount of ruthenium likely to be released into the environment
is minimal.
Another method that is being used today to get rid of radioactive
waste is the 'placement and self processing radioactive wastes in deep
underground cavities'. This is the disposing of toxic wastes by
incorporating them into molten silicate rock, with low ...

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