The process in order to refine the ash, pyrites by leaching

摘要

A process for the leaching of iron or copper pyrites cinders to solubilize the copper, zinc, lead, arsenic, cobalt, gold, silver, antimony and selenium contained therein comprises leaching the cinders with an aqueous solution containing principally NO3-, H+ and Clions, the concentration of the NO3- ions being less than 10% by weight and the concentration of the Clions being less than 15% by weight. An aqueous solution of nitric acid and sodium chloride or of sodium nitrate and hydrochloric acid may be used as the leaching liquor. The aqueous solution may be at between ambient temperature and the boiling point.