| 摘要 |
<p>The present specification discloses a method of selective dissolution of the non-ferrous metals such as copper, lead and zinc contained in pyritic ores. The method invention is applicable especially to ores of solid pyrites which contain nonferrous metals in the form of sulphides or of very finely crystallized sulpho-antimonides and sulpho-arsenides. Such ores are characterised by fine crystals, which may be of the order of a few microns in size, and by the distribution of copper, lead and zinc ores in the pyrites,the matrix generally being of small volume. The method according to the-invention can also be successfully applied in the treatment of other ores, for example cupriferous pyrites containing only a certain proportion of copper sulphide, or more complex pyritic ores containing in addition lead sulphide and zinc sulphide, which may or may not be associated with copper sulphides, or sulphurized concentrates obtained by flotation, such as blende, galenite or chalcopyrite. The method for selectively dissolving non-ferrous metals contained in pyritic ores, comprises crushing the ore, introducing the crushed ore, which being stirred and at a temperature above the ambiant temperature, into a reaction vessel containing a solution of chlorides of a metal having two valency states, and injecting gaseous chlorine into said reaction vessel.</p> |
