Metal Finishing Guide Book

2013

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682 Material Input • Acid/alkaline solutions • Heavy metal-bearing solutions • Cyanide-bearing solutions • Metals (e.g., salts) • Complexing agents • Alkalis Electroplating Table 1. Process Inputs and Pollution Generated by Metal Finishingvii Miscellaneous (e.g., polishing, hot dip coating and etching) Plating • Dilute metals • Dilute acids Chemical Conversion Coatings Surface Preparation Solvent Degreasing and • Solvents Emulsion Alkaline and Acid • Emulsifying agents Cleaning • Alkalis • Acids Surface Finishing Anodizing • Acids Process • Solvent • Alkaline • Acid wastes Process Wastewater • Acid/alkaline • Cyanide • Metal wastes • Cyanide • Metal wastes • Metal ion-bearing mists • Acid mists • Metal ion-bearing mists • Acid mists • Metal fumes • Acid fumes • Particulates • Metal • Acid wastes • Metal salts • Acid • Base wastes • Metal ion-bearing mists • Acid mists • Metal ion-bearing mists • Acid mists • Acid wastes • Solvents • Caustic mists Air Emission • • • • Polishing sludges Hot dip tank dross Etching sludges Scrubber residues • Cyanide • Metal wastes • Spent solutions • Wastewater treatment sludges • Base metals • Metal • Reactive wastes • Spent solutions • Wastewater treatment sludges • Base metals • Ignitable wastes • Solvent wastes • Still bottoms Solid Waste

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