Patent ID: 11920210
Assignee: METALLO BELGIUM
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 15:
16. The process according to claim 13 further comprising at least one of the following steps:
VII. pre-refining the second crude solder metal composition using silicon metal to produce a pre-refined solder metal composition,
VIII. cooling at least one of the second crude solder metal composition and, under the condition that step VII is selected as being part of the process, the pre-refined solder metal composition, down to a temperature of at most 825° C. to produce a bath containing a first supernatant dross which by gravity becomes floating upon a first liquid molten tuned solder phase,
IX. adding at least one of an alkali metal, an alkaline earth metal, and chemical compounds comprising at least one of an alkali metal and an alkaline earth metal, to at least one of the second crude solder metal composition, under the condition that step VII is selected as being part of the process, to the pre-refined solder metal composition, and, under the condition that step VIII is selected as being part of the process, to the first liquid molten tuned solder phase to form a bath containing a second supernatant dross which by gravity comes floating on top of a second liquid molten tuned solder phase,
X. under the condition that step IX is selected as being part of the process, removing the second supernatant dross from the second liquid molten tuned solder phase, thereby forming a second tuned solder,
XI. under the condition that step VIII is selected as being part of the process, removing the first supernatant dross from the first liquid molten tuned solder phase, thereby forming a first tuned solder,
XII. distilling at least one of, under the condition that step XI is selected as being part of the process, the first tuned solder and, under the condition that step X is selected as being part of the process, the second tuned solder, wherein lead (Pb) is removed from the solder by evaporation and a distillation overhead product and a distillation bottom product are obtained.