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Chemistry of the M (M=Fe, Ca, Ba)-Se-H(2)O systems at 25 degrees C
Tadahisa Nishimura1, Ryosuke Hata, Fumihiko Hasegawa
1Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 1,1 Katahira, 2-chome, Aobaku, Sendai 980-8577, Japan. tadahisa@tagen.tohoku.ac.jp
Abstract:
The chemistry of the M (M=Fe, Ca, Ba)-Se-H(2)O systems at 25 degrees C is reviewed based on our previous papers. In this paper, the phase equilibria in the Fe(III)-Se(IV)-H(2)O, Ca-Se(IV,VI)-H(2)O and Ba-Se(IV,VI)-H(2)O systems at 25 degrees C are discussed. Then, the three-stage process for removal of selenium from industrial waste water [Se(IV,VI) < 1,500 mg/L] containing sulfuric acid was introduced. This seems to be a promising process for selenium removal from acidic sulfate waste water containing high concentration levels of selenium to below 0.1 mg/L.
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