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copper vacuum tailings spent electrolyte 1

Feb 25, 2007 2.2. Analytical methods2.2.1.. Metal concentrationThe copper content of the tailings was determined by adding 20.0 mL 11 HNO 3 to 1.0. g dry matter and treating the sample in autoclave, according to the Danish Standard DS 2592003 30 min at 200 kPa 120 C.. The liquid was separated from the solid particles by vacuum through a 0.45 m filter and diluted to 100.0 mL.