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Use of Alkaline Extraction to Quantify Sulfate Concentration in Oxidized Mine Tailings

Dep. of Chemical Engineering, Lakehead Univ., 955 Oliver Road, Thunder Bay, ON, Canada P7B 5E1

View larger version (133K): [in a new window]   Fig. 1. Backscattered electron image of the edge of a typical grain in unextracted KK-1 tailings. J is jarosite; Sc is an iron oxyhydroxysulfate phase with Fe/S mole ratios between 6.5 and 12.

View larger version (142K): [in a new window]   Fig. 2. Backscattered electron image of the interior of a typical grain in extracted KK-1 tailings. F is an iron oxyhydroxide phase; Q is quartz.

View larger version (148K): [in a new window]   Fig. 3. Backscattered electron image of the interior of a typical grain in extracted KK-2 tailings. Ch is chalcopyrite; F is an iron oxyhydroxide phase; Py is Pyrite; Q is quartz.