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Preparation of low O/M MOX pellets for fast reactors using carbothermic reduction

炭素熱還元反応を用いた高速炉用低O/Mペレットの調整

村上 龍敏 ; 加藤 正人  ; 鈴木 紀一  ; 宇野 弘樹*

Murakami, Tatsutoshi; Kato, Masato; Suzuki, Kiichi; Uno, Hiroki*

約3000ppmの炭素を含む脱脂後ペレットについて、焼結中、熱天秤と熱膨張計による測定を行い、焼結挙動を評価した。試験パラメータは、焼結雰囲気の水素/水分比とした。焼結雰囲気中の水素/水分比を減少させることに伴い、ペレットの到達O/Mと収縮率が増加した。この結果から、焼結雰囲気中の水素/水分比が高い場合には、炭素の熱還元反応によりO/M比が大幅に減少し、反面、焼結雰囲気中の水素/水分比がより低い場合には、雰囲気中の酸素ポテンシャルが高く保たれ、O/M比の低下が抑制されたものと考えられる。

The sintering behavior of the de-waxed pellets containing about 3000 ppm of carbon was analyzed during the sintering process using thermal gravimetry and dilatometer measurements as a parameter of the ratio of hydrogen partial pressure-to-moisture partial pressure (H$$_{2}$$/H$$_{2}$$O) in the sintering atmosphere. The attained O/M ratio and the shrinkage rate increased with decreasing H$$_{2}$$/H$$_{2}$$O ratio in the sintering atmosphere. As a result, it is considered that a carbothermic reduction caused the significant decrease of the O/M ratio in the case of the sintering in the atmosphere of high H$$_{2}$$/H$$_{2}$$O ratio. In contrast, decrement of O/M ratio could be inhibited by keeping the oxygen potential of the atmosphere high in the case of the sintering in the atmosphere of lower H$$_{2}$$/H$$_{2}$$O ratio.

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