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The result of leaching of a 75% acid rock/25% limestone column with limestone-saturated solution has shown that the pH of the effluent recovered from 2.5, after apparent loss of acid neutralizing capacity after 4years with water leaching, to pH 7 in less than 3years. Bulk assay results, XRD and SEM/EDS analyses of samples from the column at 384weeks (pH 3.6) and 522weeks (pH 6.9) during this recovery...
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