溶融錫を溶媒として用いたステンレス鋼中のニッケル, コバルトの分離 Fundamental Study on Extraction and Separation of Nickel and Cobalt from Stainless Steel by Using Tin as Solvent
Construction materials in a shutdown nuclear power plant contain radio activated nickel and cobalt in iron alloys such as stainless steel. The separation of nickel and cobalt from the alloy is required to reduce storage volume of the activated materials. In order to obtain fundamental information on the separation of nickel and cobalt from the stainless steel, the extraction method by using metallic tin as a solvent was studied at 1, 673 K. The following results have been obtained.<BR>By addition of tin and silicon to the stainless steel, phase separation to the metallic tin phase and the stainless steel phase dissolving silicon occurs, and the minimum mutual solubility between the two phases was obtained at 23 mass% Si in the stainless steel phase at 1, 673 K. The distribution ratio of nickel in the tin to stainless steel phases decreases extremely from 0.5 to 0.05 with increasing silicon content from 10 to 23 mass% in the stainless steel phase while the distribution ratios of cobalt and iron represent almost 1/10 of the nickel value. The separation coefficient of nickel shows the minimum value of 8 at 23 mass% Si in the Fe-Si phase while cobalt exhibits almost 2 in the experimental composition region. Based on the experimental results, the extraction and separation process for nickel and cobalt by using metallic tin as a solvent is evaluated at 1, 673 K.
- 資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan
資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan 113(12), 1092-1095, 1997-12-25
The Mining and Materials Processing Institute of Japan