Oxygen diffusion and consumption in low-sulphide tailings covers

摘要: Acid-generating tailings can be reclaimed using oxygen barrier covers in humid climates, such as Quebec. A single-layer low-sulphide cover is an attractive alternative to traditional water maximize the impoundment’s storage capacity. Low-sulphide serve a moisture-retaining material limit diffusion, and their residual sulphides consume diffusive that still gets through cover. laboratory experiment instrumented columns was initiated confirm efficiency of monolayer placed over acid-generating reduce flux reaching reactive tailings. Oxygen concentration profiles were measured thickness fluxes calculated evaluate effect three parameters on these fluxes: table level, sulphide content, thickness. at bottom layer, gradient estim...