토착호산성박테리아를 이용한 황화광물의 용출 특성 = The Characteristic of sulfide mineral Using Indigenous Acidophilic Bacteria

다국어 초록 (Multilingual Abstract)

This study was to investigate the viability of indigenous acidophilic bacteria at 42℃ and 52℃, and to enhance the leaching of valuable elements from galena during the oxidation of the indigenous acidophilic bacteria with no addition of sulfuric acid. Even through the isoelectric point of the pH environment was higher, the indigenous bacteria were attached to the surface of the galena and sphalerite. In the bioleaching of galena at 42℃ and 52℃, the rod-shaped bacteria ranged from 0.4×1.3 ㎛ to 0.5×1.6 ㎛ and were attached to the galena and sphalerite surface. When the indigenous bacteria oxidized the galena at 42℃ and 52℃, an extracellular polymeric substance(EPS) formed and coated the surface of the galena and sphalerite grains. The EPS formation was probably secreted by the indigenous bacteria. Hexagonal column crystals were formed on the surface of the galena, and the numerous indigenous bacteria were attached to the surface of the hexagonal crystals. Corrosion pits were distinctly observed on the surface of the secondary mineral by the direct contact attachment of indigenous bacteria.

목차 (Table of Contents)

• List of tables ⅰ
• List of figures ⅱ
• Abstract ⅲ
• 1. 서 론 1
• 2. 이론적 배경 4
• 3. 박테리아 시료 및 실험방법 6
• 3.1 토착박테리아 채취 6
• 3.2 성장-배양액 조성 6
• 3.3 황화광물-용출 배양액 조성 7
• 3.4 황화광물 시료 8
• 3.5 분석기기 8
• 4. 결과 및 고찰 9
• 4.1 황화광물-용출 배양액에서 pH 변화 9
• 4.2 황화광물 표면특성 12
• 4.3 박테리아 부착 특성 16
• 4.4 박테리아에 의한 충식작용 19
• 4.5 2차 생성물 형성 23
• 4.6 황화광물 용출 특성 27
• 4.7 용출에 따른 황화광물의 XRD 변화 37
• 5. 토 의 43
• 6. 결 론 44
• 참 고 문 헌 45