| abstract |
In this method, the spent stripper for tin or tin mixture is treated to precipitate the dissolved or suspended metal compound. On the one hand, chemicals for recycling are recovered from the waste stream and on the other hand metals such as copper, tin, lead and / or iron. The precipitation efficiency is improved by heating the stripping solution at an elevated temperature and adding a precipitation reagent. When the precipitate is removed, the remaining liquid is usually mixed with a new solution and can be recycled. In a method of producing a regenerated tin stripper comprising at least one inorganic acid, ferric ion, at least one organic acid and at least one organic additive, the stripper is heated at an elevated temperature and a precipitation reagent is added And the precipitate is separated and removed and one or more acids or additives as described above are added to restore the desired tin stripping capability. |