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Recovery of Metal Value from Electroplating Sludge

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Author Affiliations

  • 1Department of Organic Chemistry North Maharashtra University, Jalgaon–425 001, MH, INDIA
  • 2K.E.S. Late S.P. Jain Jr. College Nagothane, Tal Roha, Dist. Raigad 402106, MH, INDIA

Res.J.chem.sci., Volume 2, Issue (3), Pages 61-63, March,18 (2012)

Abstract

A huge amount of metals has been generated in electroplating waste. The metal content in these wastes is sometimes very high and it is, therefore, economically viable to extract and recycle them due to their value as a process credit. Moreover, these wastes are regarded as hazardous because of the leachability of hazardous components. Sulfuric acid is a very effective leaching agent for metal-bearing hydroxide materials. The leaching operation is performed at ambient pressure and without external heating with constant stirring. Leaching time was 30 minutes, followed by solid - liquid separation. The filtrate typically contains better than 99% of the metal values available from the sludge. Selective precipitations for the separation and recovery of soluble metal components common to electroplating sludge′ s has been developed the separation of Iron & Chromium from the Nickel solution. At ambient temperature (20°C), ferric phosphate will precipitate cleanly in the presence of Chromium and Nickel cations through the pH range 1.5 to 2.0.Further more from solution, chromic phosphate can be made to precipitate through approximately the same pH range by heating the solution to 50 to 60°C. The individual chromium phosphate particles are spherical in shape which results in excellent filterability and minimum surface adsorption of other ionic species. After separation of Iron and Chromium, Nickel was recovered as its salt and recovery was 98.7%.

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