原子炉用黒鉛中の不純物元素の分析化学的研究

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タイトル別名
  • Analytical studies on impurity elements in nuclear-grade graphite.
  • ゲンシロヨウ コクエンチュウ ノ フジュンブツ ゲンソ ノ ブンセキ カガクテ

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抄録

Eleven brands of graphite materials for nuclear reactors from four countries (100 to 3300kg) were precisely analyzed to identify their impurities. The powder samples for analysis (ca. 100g each) were prepared by shaving 23 block samples (ca. 1kg each) with a tungsten carbide bite and mixing well. Twelve elements (Al, Ca, Cd, Co, Cu, Fe, Li, Mg, Mn, Ti, V) were determined from solutions obtained by a newly developed wet oxidation decomposition method for graphite. The results obtained are summarized as follows: (1) Major impurity elements are iron, calcium and silicon. Titanium is next to the three elements, and aluminium and vanadium are comparable to titanium in some graphite materials. (2) Unrefined graphite materials contained 400 to 2400ppm of ash.The content of ash (sum of unvolatile elements expressed as oxides) is higher in inner part of the graphite materials than in the outer. Heterogeneity of sulfur is not so much compared with the metal impurities. (3) One gram-sample obtained directly from the block sample by drilling, shows very dispersed analytical values which reveals the existence of colonies of the impurities. (4) Corrosion rate of graphite (with 0.65% water at 1000°C for 10h), increases with increasing iron content but not with the ash content.

収録刊行物

  • 分析化学

    分析化学 35 (11), 920-925, 1986

    公益社団法人 日本分析化学会

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