酸化/還元 條件에 따른 黃化鑛物의 浮游選別에 의한 回收性 變化
The Effect of Oxidation/Reduction of Sulfide Mineral on Its Recovery by Flotation
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초록
Chalcopyrite 를 대상으로 광미 중에 함유된 Sulfide 물질의 부유선별에 의한 분리회수 과정에서 산화가 부유성에 미치는 영향을 고찰하였다. Zisman Plot에 의해 도출된 Chalcopyrite 의 임계계면장력은 약 15.5 dyne/cm인 것으로 파악되었으며 포수제의 농도가 증가함에 따라 그 값은 감소하여 Chalcopyrite 의 부유성이 상승하는 것으로 관찰되었다. 초기 산화에 의한 Chalcopyrite의 부유성 상승은 S22-의 So로의 전환에 기인하는 것으로 판단되었으며 형성된 So가 SO42- 및 S2O32-로 재전환됨에 따라 Chalcopyrite 의 부유성은 다시 감소하는 것으로 사료되었다. 산화된 Chalcopyrite 의 환원 시 부유성은 상승하는 것으로 나타났으며 산화/환원 과정에서의 임계계면장력의 변화 양상은 원자간 Bond Energy 의 변화에 의거한 Energy Diagram 으로 해석되었다.
Abstract
The influence of oxidation on the floatability of sulfide minerals contained in mine tailings has been investigated employing chalcopyrite as a target material. The critical surface tension of chalcopyrite was estimated to be about 15.5 dyne/cm based on Zisman plot and the floatability of chalcopyrite was observed to increase with the concentration of collector. The enhanced floatability of chalcopyrite at its initial stage of oxidation was considered to be due to the transformation of disulfide to elemental sulfur and the decrease in its floatability at further oxidation was presumably caused by the formation of sulfate and/or disulfur trioxide from elemental sulfur. When the oxidized chalcopyrite was reduced, its floatability was increased and the variation of the critical surface tension of chalcopyrite according to the oxidation/reduction was interpreted by an energy diagram constructed by different bond energies between atoms.
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