<報文>金属カルシウムを用いた鉄基合金からのニッケル, コバルトの分離

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The decommissioning of a nuclear power plant yields a large amount of scrap of iron alloy such as stainless steel, which contains partially radio activated nickel and cobalt. To reduce radioactivity of radioactivative wastes, the following process for separation of nickel and cobalt from iron alloy is proposed that nickel and cobalt are extracted from a molten iron alloy by using metallic calcium at the first stage then the dissolved nickel and cobalt in the calcium phase are separated with cerium at the second stage. For obtaining the fundamental information of the separation process, distribution ratios of the components between the molten calcium and carbon saturated iron alloy at 1573K and metallic calcium and cerium phases at 1273K were determined with the quenching method in Ar atmosphere. Because the distribution ratio of nickel in the calcium phase is almost 100 times of that for iron while the concentration of nickel in the calcium phase is almost 1/7 of the iron phase, nickel may be extracted separately from iron into the calcium phase at 1573K. On the other hand, the concentration of cobalt in the calcium is about 1/170 compared with iron content in the iron alloy phase. Based on these values, the extraction of cobalt from the iron phase with calcium is not expected in the separation process. The nickel content in cerium is almost 10 times of the remained nickel content in the calcium melt in the equilibrium between the calcium and cerium phases corresponding to the second stage at 1273K. Thus, the separation of nickel from the calcium into the cerium phase by addition of cerium is expected but not so effective in the process. The process simulation for the separation process based on the present experimental result shows that the separation of nickel from iron alloy with calcium and cerium is not effective though the separation from iron is possible.recyclemetal solventdistribution coefficientseparation coefficientnickelcobalt
東北大学の論文
1998-03-27

<報文>金属カルシウムを用いた鉄基合金からのニッケル, コバルトの分離

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