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18.116.28.79
18.116.28.79
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SCIE SCOPUS
수용액중에서 산소에 의한 Co - Ni 공심수산화물의 산화반응 거동에 관하여 ( 페라이트법에 의한 중금속 폐수처리에 관한 연구 제2보 )
Oxidation Reaction Behaviors of Co - Ni Hydroxide Coprecipitates by oxygen in Aqueous Solution
김지환(Ji Hwan Kim), 강남기(Nam Kee Kang), 오재현(Jae Hyun Oh)
UCI I410-ECN-0102-2008-580-001848521

The oxidation behaviors of Co-Ni hydroxide coprecipitates were investigated with relation to the conditions of the solution such as R value(=2〔OH^-〕 / 〔SO^(2-)₄〕), temperature and initial 〔Ni(Ⅱ)〕/〔Co(Ⅱ)〕 molar ratio. The characteristics of reaction products were examined by composition analysis, XRD, TEM and magnetic property measurement. When increasing R value, the reaction time and particle sizes were increased. And the reaction products were Co-Ni ferrite. The amount of Co incorporated into the spinel structure increased and that of Ni decreased with increasing R value and temperature. In reaction products represented by Co, Ni_yFe_(3-(x+y))O₄, the amount of (x+y) shows the ranges between 0.6 and 0.7, regardless of R value and temperature. In the conditions of R=1.5, 70℃, 〔Co(Ⅱ)+Ni(Ⅱ)〕/〔Fe(Ⅱ)〕 ratio 0.5, 〔Ni(Ⅱ)〕/〔Co(Ⅱ)〕 ratio =2.0 in the initial solution, Co and Ni incorporated with equal amounts into spinel structures and the reaction product of Co_(0.29)Ni_(0.29)Fe_(2.41)O₄ was obtained.

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