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AssigneeMetallo Belgium
InventorsBert Coletti, Yves De Visscher, Charles Geenen, Jan Dirk A. Goris, Koen Govaerts, Pelle Lemmens, Kris Mannaerts
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Disclosed is a process for the production of a purified soft lead product, including a first distillation step for distilling lead from a molten solder mixture to produce as overhead a first concentrated lead stream and as first bottom product a molten crude tin mixture. The process also includes a soft lead refining step for removing at least one contaminant selected from arsenic, tin and/or antimony from the first concentrated lead stream by treating the stream at a temperature of less than 600° C. with a first base and a first oxidant stronger than air, resulting in the formation of a third supernatant dross containing a metalate compound of the contaminant, followed by separating the third supernatant dross from the purified soft lead stream or product, whereby the third supernatant dross contains at most 1.0% wt of chlorine.
A process for the production of a purified soft lead product, comprising:
7-8. (canceled)
10-13. (canceled)
18-24. (canceled)
The process according to claim 11, wherein the first tin-enriched product and/or the first bottom product is subjected to a second distillation step separating off by evaporation primarily lead and antimony from the first tin-enriched product and/or the first bottom product, thereby producing as overhead product a second concentrated lead stream and a second bottom product.
(canceled)
The process according to claim 12, wherein the second concentrated lead stream is subjected to a third distillation step separating off by evaporation primarily lead and antimony from the second concentrated lead stream, thereby producing as overhead product a third concentrated lead stream and a third bottom product.
28-29. (canceled)
The process according to claim 13, further comprising the step of removing at least one contaminant selected from the metals arsenic and tin from the third concentrated lead stream, thereby producing a purified hard lead stream as a hard lead product.
The process according to claim 12, wherein the second bottom product is further refined to obtain a high purity tin prime product.
32-35. (canceled)
Dependencies are inferred from the claim text.