NEW TECHNOLOGY FOR THE PREVENTION OF ACID ROCK DRAINAGE

摘要

The effectiveness of the new DuPont Passivation Technology in eliminating acid generation from iron sulfides is presented. Passivation is achieved by treatment with a dilute basic permanganate solution. This treatment produces a thin impervious layer of iron/manganese oxide on the sulfide surface, providing a barrier to the environment so that the sulfide is not available for undesirable reactions such as the production of acid.