C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/333
C22B 13/02 (2006.01)
Patent
CA 1220036
ABSTRACT The invention relates to a method for producing lead having a sulphur content beneath about 2%, from sulphur-containing oxidic lead raw materials conta- minated with zinc and/or other readily oxidized elements, by smelting the materials in a furnace in which the furnace contents can be agitated. When practicing the method, the lead raw materials are charged to the furnace together with iron-containing fluxes and solid reduction agents. The charged materials are heated under agitation, to form a lead phase and a slag phase. The amount of reduction agent charged is selected so that at least all th lead contained in the furnace is reduced to lead metal and the amount and composi- tion of the fluxes are selected so that a terminal slag is obtained in which the sum of the iron and zinc present is 30-40% and so that the slag has a content of 15-25% of both SiO2 and CaO + MgO. Lead raw materials, fluxes and reduction agents are suitably introduced in a plurality of charges, with intermediate moderate heating, prior to commenc- ing the smelting process.
452262
Buren Kurt J.a.
Hedlund M. Lennart
Leirnes J. Sverre
Lundstrom Malkolm S.
Boliden Aktiebolag
Gowling Lafleur Henderson Llp
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