Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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vert dissolved metals into solids for dewatering and hazardous disposal. Emphasis must be placed on waste minimization as the first step in reducing waste treat- ment. Examples include ion exchange, reverse osmosis, and electrowinning or elec- trolytic recovery, which electroplates the spent bath into nickel or copper metal onto special cathodes helping to reduce the amount of sulfide or hydroxide hazardous sludge eventually created. The resultant plated metal produced can be reclaimed as scrap metal. Other waste minimization methods include using steel wool to plate out the electroless bath prior to further waste treatment. 369

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