ホリ ヒサオ   Hori Hisao
  堀 久男
   所属   神奈川大学  理学部 化学科
   職種   教授
発表年月日 2019/08/21
発表テーマ Efficient photochemical recovery of rhenium from aqueous mixed metal solutions
発表学会名 Copper 2019
主催者 The Metallurgy and Materials Society of the Canadian Institute of Mining, Metallurgy, and Petroleum
学会区分 国際学会
発表形式 ポスター
単独共同区分 単独
開催地名 Vancouver
発表者・共同発表者 Hisao Hori, Takafumi Otsu
概要 Rhenium has recently been recognized as a strategic material, owing to its high heat resistance, high corrosion resistance, high hardness, and other characteristics. In the present work, we investigated selective precipitation recovery of rhenium from aqueous solutions containing a coexisting metal (molybdenum or tungsten) by means of UV-visible light irradiation in the presence of 2-propanol and acetone. When the pH of the rhenium-molybdenum solutions was in the range from 6.3 to 12.5 and the irradiation time was 6 h, the rhenium in the initial solutions was efficiently recovered in the precipitates (92-99%), and the rhenium selectivity was high (the rhenium recovery ratio was 9.2-21 times that of molybdenum). Rhenium was also recovered efficiently and selectively from rhenium-tungsten solutions: when the pH ranged from 7.0 to 12.0 and the irradiation time was 6 h, the rhenium recovery was 90-95% and the rhenium recovery ratio was 7.3-45 times that of tungsten.