FOERFARANDE Foer AOTERVINNING AV BLY OCH SILVER UR BLY-SILVERAOTERSTODER

摘要

A process for treatment of lead residues, without prior sintering, in which residues more than 70% of the lead is present as lead sulphates, comprising addition of the said residues, together with a reductant containing carbon and together with fluxes that will react to provide a slag containing FeO, CaO and SiO2, directly to an electric furnace operating at a temperature of 1000 to 1500 DEG C in the slag layer to produce in the furnace a lead bullion. The expression "lead sulphates" will be understood to include lead sulphate and other compounds containing lead and the sulphate ion, for example, the basic lead sulphates.