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sand washing machine gold processing steps

sand washing machine gold processing steps

a much better and surer procedure is 2.0 remove oxides with pumice. 2.1 rinse well. 2.2 electroclean for 1.5 2.5 minutes, object as cathode, then reverse the polarity for a few seconds. 2.3 rinse 3- 5 times in running water. 2.4 dip in 110 sulfuric acid to neutralize the electrocleaning solution and activate surface. 15 seconds or so. 2.5 rinse 3 5 times in running water

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