석탄 광산배수에 함유된 금속 침전물의 부선 특성 = Flotation of Metal Precipitates in Coal Mine Drainage

국문 초록 (Abstract)

본 연구에서는 인공 폐수 및 석탄 광산배수에 함유된 철, 망간 그리고 알루미늄 침전물 등을 부유선별로 제거할 수 있는지를 알아보았다. Sodium dodecyl sulfate, Aeropromotor 845, 올레인산나트륨 등의 음이온 포수제들 가운데 올레인산나트륨이 철, 망간, 알루미늄 침전물을 부유시키는데 가장 효과적이었다. 인공 폐수[ Fe(III)이온 100 mg/L, Mn(II)이온 50 mg/L, Al(III)이온 50 mg/L]와 석탄광산배수[Fe(III) 16.5 mg/L, Mn(II) 3.2 mg/L, Al(III) 0.1 mg/L]에 NaOH를 첨가하여 금속 이온을 불용성 침전물로 형성시킨 후, MIBC 20 mg/L와 올레인산나트륨 200 mg/L을 첨가하여 부선한 결과, Fe(III)은 pH 7～9의 범위에서, Mn(II)은 pH 9 이상에서 그리고 Al(III)은 pH 7～8의 범위에서 각각 99.0% 이상을 부유되어 제거되었다. pH 9 이상에서 철 침전물의 제거율을 향상시키기 위해 MIBC 및 올레인산나트륨이외에 양이온 응집제인 Superfloc C-573을 첨가하여 부선한 결과, 인공폐수 뿐만 아니라 석탄광산배수에 함유된 철이 pH 9 이상에서 효과적으로 제거되었다.서 론

다국어 초록 (Multilingual Abstract)

The possibility of the removal of iron, manganese and aluminum precipitates in artificial wastewater and coal mine drainage through flotation was investigated. The sodium oleate among anion collectors such as sodium dodecyl sulfate, aeropromotor 845 and sodium oleate showed the highest floatability to remove the insoluble metal precipitates. Insoluble metal precipitates in artificial wastewater[100 mg/L of Fe(III) ion, 50 mg/L of Mn(II) ion and 50 mg/L of Al(III) ion] and coal mine drainage [16.5 mg/L of iron, 3.2 mg/L of manganese, and 0.1 mg/L of aluminum] formed by a reaction with NaOH were effectively floated by 20 mg/L of MIBC frother and 200 mg/L of sodium oleate collector at a pH 7～9, more than 9, and 7～8, respectively and the residual concentrations of which were less than 1 mgL-1. In order to enhance the removal of iron precipitates at a pH of more than 9, when a cation flocculant, superfloc C-573 was used as a activator in addition to MIBC and sodium oleate, the iron precipitates not only in artificial wastewater but also in coal mine drainage were effectively removed even at a pH of more than 9.

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