VERFAHREN ZUR WIEDERGEWINNUNG VON METALLEN AUS EINEM SCHLAMM

摘要

There is disclosed a process for recovering metals of high commercial value from a sludge (1) containing lead, antimony, silver, arsenic, bismuth and copper, by a wet method, by treating (2) the sludge (1) with aqueous hydrochloric acid (3) accompanied by air injection (4). The treated sludge is separated (5) into a silver-enriched fraction (6) and a silver-depleted solution (7). The fraction (6) is treated (8) with aqueous hydrochloric acid (9) and the treated fraction is separated (11) into an argentiferous residue (12) from which silver is recovered and a solution (13) enriched in hydrochloric acid and lead chloride. The solution (7) is cooled (21) and filtered (22) to obtain a residue (23) enriched in lead chloride from which lead may be recovered and a solution (24) containing chlorides of antimony, bismuth, silver, arsenic, copper and lead from which these elements may be recovered.