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Neutralization/prevention of acid rock drainage using mixtures of alkaline by-products and sulfidic mine wastes |
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| Authors: | Lena Alakangas Elin Andersson Seth Mueller |
| Affiliation: | 1. Division of Geosciences and Environmental Engineering, Lule? University of Technology, 971 87, Lule?, Sweden 2. Vectura Consulting AB, MMA RN Milj? V?stra Varvsgatan 11, 972 36, Lule?, Sweden 3. Boliden Mineral AB, Kontorsv?gen 1, 936 81, Boliden, Sweden |
| Abstract: | Backfilling of open pit with sulfidic waste rock followed by inundation is a common method for reducing sulfide oxidation after mine closure. This approach can be complemented by mixing the waste rock with alkaline materials from pulp and steel mills to increase the system’s neutralization potential. Leachates from 1 m3 tanks containing sulfide-rich (ca.30 wt %) waste rock formed under dry and water saturated conditions under laboratory conditions were characterized and compared to those formed from mixtures. The waste rock leachate produced an acidic leachate (pH??9). The decrease of elemental concentration in the leachate was most pronounced for Pb and Zn, while Al and S were relatively high. Overall, the results obtained were promising and suggest that alkaline by-products could be useful additives for minimizing ARD formation. |
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