Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests
Acid mine drainage (AMD), wherein acidic water is generated from pyrite-containing waste rock, can be mitigated by encapsulating pyritic waste rock with cover materials to restrict the inflow of oxygen and water. However, acidic water inevitably forms during the construction of waste rock dumps befo...
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2024-11-01
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| Series: | Physchem |
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| author | Akihiro Hamanaka Takashi Sasaoka Hideki Shimada Shinji Matsumoto Ginting Jalu Kusuma Mokhamad Candra Nugraha Deni |
| author_facet | Akihiro Hamanaka Takashi Sasaoka Hideki Shimada Shinji Matsumoto Ginting Jalu Kusuma Mokhamad Candra Nugraha Deni |
| author_sort | Akihiro Hamanaka |
| collection | DOAJ |
| description | Acid mine drainage (AMD), wherein acidic water is generated from pyrite-containing waste rock, can be mitigated by encapsulating pyritic waste rock with cover materials to restrict the inflow of oxygen and water. However, acidic water inevitably forms during the construction of waste rock dumps before applying cover materials. Considering that the presence of waste rock containing carbonate minerals contributes to acid neutralization, a mixture of carbonate minerals and pyritic waste rock can be utilized to reduce AMD generation before the completion of the cover system as a temporary management strategy. This paper examines waste rock management using blending scenarios. Kinetic NAG and column leaching tests were employed to evaluate the blending ratio necessary to prevent acidic water generation. Geochemical analyses were conducted on rock and leachate samples, including pH and temperature measurements, XRD and XRF analyses, and Ion Chromatography. Consequently, the pH and temperature measurement results obtained during the kinetic NAG test are valuable for expressing the balance between acid generation and acid neutralization by the mixture material. Furthermore, the column leaching test demonstrated that the pH of the leachate remained neutral when the acid generation and acid neutralization reactions were well balanced. Blending waste rocks is an effective method for AMD reduction during the construction of waste rock dumps. |
| format | Article |
| id | doaj-art-8f62b5c5855a400c891f95f3735e9c19 |
| institution | Kabale University |
| issn | 2673-7167 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| series | Physchem |
| spelling | doaj-art-8f62b5c5855a400c891f95f3735e9c192024-12-27T14:47:29ZengMDPI AGPhyschem2673-71672024-11-014447048210.3390/physchem4040033Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching TestsAkihiro Hamanaka0Takashi Sasaoka1Hideki Shimada2Shinji Matsumoto3Ginting Jalu Kusuma4Mokhamad Candra Nugraha Deni5Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 8190395, JapanDepartment of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 8190395, JapanDepartment of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 8190395, JapanGeological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 3058567, JapanDepartment of Mining Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung 40132, IndonesiaEnvironmental Engineering, Faculty of Civil Engineering and Planning, National Institute of Technology, Bandung 40124, IndonesiaAcid mine drainage (AMD), wherein acidic water is generated from pyrite-containing waste rock, can be mitigated by encapsulating pyritic waste rock with cover materials to restrict the inflow of oxygen and water. However, acidic water inevitably forms during the construction of waste rock dumps before applying cover materials. Considering that the presence of waste rock containing carbonate minerals contributes to acid neutralization, a mixture of carbonate minerals and pyritic waste rock can be utilized to reduce AMD generation before the completion of the cover system as a temporary management strategy. This paper examines waste rock management using blending scenarios. Kinetic NAG and column leaching tests were employed to evaluate the blending ratio necessary to prevent acidic water generation. Geochemical analyses were conducted on rock and leachate samples, including pH and temperature measurements, XRD and XRF analyses, and Ion Chromatography. Consequently, the pH and temperature measurement results obtained during the kinetic NAG test are valuable for expressing the balance between acid generation and acid neutralization by the mixture material. Furthermore, the column leaching test demonstrated that the pH of the leachate remained neutral when the acid generation and acid neutralization reactions were well balanced. Blending waste rocks is an effective method for AMD reduction during the construction of waste rock dumps.https://www.mdpi.com/2673-7167/4/4/33acid producingacid neutralizingblendingdry coverencapsulation |
| spellingShingle | Akihiro Hamanaka Takashi Sasaoka Hideki Shimada Shinji Matsumoto Ginting Jalu Kusuma Mokhamad Candra Nugraha Deni Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests Physchem acid producing acid neutralizing blending dry cover encapsulation |
| title | Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests |
| title_full | Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests |
| title_fullStr | Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests |
| title_full_unstemmed | Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests |
| title_short | Mitigation of Acid Mine Drainage Using Blended Waste Rock in Near-Equatorial Climates—Geochemical Analysis and Column Leaching Tests |
| title_sort | mitigation of acid mine drainage using blended waste rock in near equatorial climates geochemical analysis and column leaching tests |
| topic | acid producing acid neutralizing blending dry cover encapsulation |
| url | https://www.mdpi.com/2673-7167/4/4/33 |
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