| 摘要 |
PURPOSE:To operate the denitration of uranium, and to facilitate the automatic operation, by kneading a uranyl nitrate solution and the seed powder of denitrated product, controlling the moisture-content of the mixture to obtain a cake, thermally denitrating the cake with microwave radiation, crushing and classifying the denitrated product, and using the product as the seed powder. CONSTITUTION:The seed powder of the denitrated product prepared in advance is supplied from the constant-rate feeder 1 at a prescribed rate continuously to a kneading machine 2, and at the same time, a uranyl nitrate solution is supplied from the solution- metering tank 15 at a prescribed rate continuously through the nozzle 15A to the kneading machine 2. The raw materials are kneaded uniformly with the kneading machine 2, and the obtained wet powder is supplied continuously to the molding machine 3 and compression-molded to a cake having a definite dimension. The cake is transferred continuously to the microwave-heating denitration apparatus 6. The cake is denitrated by the microwave radiation, and the solidified denitrated cake is transferred successively to the rough crusher 7, pulverizer 8, and sieve 9 to effect the crushing and classification. A part of the denitrated uranium recovered by the recycling powder hopper 10 is recycled to the constant rate feeder 1 and reused as the seed powder.
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