Venika Ekanayake
Use zone melting method for cleaning.
https://en.wikipedia.org/wiki/Zone_melting
To purify Sn metal containing oxides, several methods can be used depending on the required purity level. Zone refining (zone melting) is an effective method for obtaining high-purity Sn by gradually moving a molten zone through the material allowing impurities to segregate. Electrolytic refining can also be used where impure tin is dissolved and redeposited as high-purity metal. Flux refining involves adding a suitable flux (e.g. sodium hydroxide or chloride-based fluxes) to react with oxides and separate them from the molten tin. Vacuum distillation may be used for extreme purification by evaporating tin and condensing it separately from impurities. The choice of method depends on the scale and required purity of the final material.
Here are a few methods from Fathi Habashi's Handbook of Extractive Metallurgy pg 702- 705.
(He in on RG,
https://www.researchgate.net/profile/Fathi-Habashi
contact him for further copyright regarding fair use of his content)
Sn can be purified by melting it from higher melting point impurities, smelting will reduced the impurities is from tin to 99.85% . Then it can be subjected to electrolytic refining if lead is not present in its ore
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