CPC C22B 15/0054 (2013.01) [B23K 35/302 (2013.01); C22B 5/02 (2013.01); C22B 7/04 (2013.01); C22B 13/025 (2013.01); C22B 15/0056 (2013.01); C22B 25/06 (2013.01); C22C 9/08 (2013.01); C22C 13/00 (2013.01)] | 16 Claims |
1. A process for producing a crude solder composition, comprising the provision of a first solder refining slag which slag comprises at least 12% wt together of tin and lead and at most 10.0% wt together of copper and nickel, the process further comprising the steps of:
e) partially reducing the first solder refining slag, thereby forming a first crude solder metal composition and a second solder refining slag, followed by separating the second solder refining slag from the first crude solder metal composition; and
f) partially reducing the second solder refining slag, thereby forming a second lead-tin based metal composition and a second spent slag followed by separating the second spent slag from the second lead-tin based metal composition,
wherein a copper containing fresh feed is added to step f) and wherein the second lead-tin based metal composition comprises at least 60% wt together of copper and nickel.
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