2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 12. Intl. Symp on Mining, Mineral and Geomechanics
| Editors: | F. Kongoli, L. Guo, L. Liu, G.N. Anastassakis, L. Andric, K. Aravossis, V. Chanturiya, I. Chatjigeorgiou, D. Fuerstenau, V. Panayotov, J. Rubinstein |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2025 |
| Pages: | 240 pages |
| ISBN: | 978-1-998384-60-0 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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PHYSICOCHEMICAL, MECHANICAL AND LEACHING CHARACTERISTICS OF HYBRID GEOPOLYMER-CEMENT MORTAR INCORPORATING COPPER MINE TAILINGS AND SILT
Dionella Jitka Quinagoran1; James Albert Narvaez1; Joy Marisol Maniaul1; John Kenneth Cruz1; Djoan Kate Tungpalan1; Eduardo Magdaluyo1; Karlo Leandro Baladad1;1UNIVERSITY OF THE PHILIPPINES DILIMAN, Quezon City, Philippines;
Type of Paper: Regular
Id Paper: 231
Topic: 5
Abstract:
Mine waste remains a persistent challenge for the minerals industry, posing significant environmental concerns if not properly managed. The 1996 Marcopper mining disaster in Marinduque, Philippines, left a legacy of mine tailings that continue to threaten local ecosystems and communities. This study investigates the valorization and stabilization of Marcopper river sediments contaminated with mine tailings using a combined geopolymerization and cement hydration approach. Hybrid mortar samples were prepared with 7.5%, 15%, 22.5%, and 30% mine tailings by weight, incorporating potassium hydroxide (KOH) at 1M and 3M concentrations as alkaline activators, along with ordinary Portland cement (OPC). The mechanical properties of the hybrid geopolymer-cement mortars were evaluated through unconfined compressive strength tests, while their crystalline structure, phase composition, surface morphology, and chemical bonding characteristics were also analyzed. Static leaching tests were conducted to assess the mobility of heavy metals within the geopolymer matrix. Compressive strengths ranged from 24.22 MPa to 53.99 MPa, satisfying ASTM C150 requirements. In addition, leaching results confirmed effective heavy metal encapsulation and immobilization, demonstrating the potential of this method for mitigating environmental risks associated with mine tailings.