To improve leach resistance by mixing a plastic material with an ingredient of a solidified aluminosilicate, sintering the mixture at the synthesizing temperature of the aluminosilicate and then sintering it at the softening temperature or higher of the plastic material.
A skeletal material 1 of solidified aluminosilicate and waste 2 of a molten salt are supplied to mixing process 4. Then, much the same quantity of a plastic ingredient 3 as that of the mixture is supplied and they are mixed evenly. The mixed materials are put into a cylindrical stainless container in a molding process 5 and pressure molding is carried out under the pressure of about 2,000 kg/cm2 exerted from the upper part of the container. With the mixed materials kept in the container, they are sintered at nearly 700°C for about 200 hours under the atmosphere in the first sintering process 6. In the second sintering process 7, subsequently, the mixture is sintered at the softening temperature of 1,000°C of the plastic ingredient 3 for about 10 hours to obtain waste 8 of solidified chloride. Consequently, the solidified waste is in contact with a liquid with a small contact when the waste is immersed in the water and such a simple process also makes it possible to manufacture a solidified waste with a less quantity of unimmobilized waste of the molten salt 2.
SAWA TOSHIO
MATSUBARA CHIAKI
KOYAMA MASASHI
CENTRAL RES INST ELECT
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