engleski

Separation of tin and lead by ion exchange from plating rinse water

In surface finishing processes, large amounts of water are used, resulting in quantities of wastewater contaminated with metallic ions. The inclining fresh water for rinsing of printed circuit boards is demineralized, which is after rinsing of printed circuit boards is demineralized which is, after rinsing, contaminated with copper, nickel, lead and tin metallic ions. Because these are toxic metals (1-9), when present in wastewater in concentrations greater then permitted, they contaminate water ways. The most economical procedure for separation of heavy metals is ion exchange, in which metallic ions from waste water are bound to ion exchange resins and after anion exchange, the water can be reused as rinsewater in the production process (10-14).

heavy metals; permitted concentrations; ion-exchange; ion-exchange resin

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