![]() ![]() Further difficulties are experienced in attempting to replace a precoated leaf back into the clarifier tank without sloughing off part of the precoat and thereby entirely defeating the purpose of the precoating operation.Ī precoat clarifier developed by the Merrill Company successfully overcomes these difficulties and has gained rather wide usage. Thinly covered areas are not adequately protected, and a precoat which is thicker than necessary wastefully consumes filter aid. Attempts to “paint on” the precoat as a thick slurry of filter aid have not given good results. Much of the advantage of precoating is lost if the filter aid is not properly used. The requisites of effective precipitation of gold and silver from cyanide solutions are briefly as follows, based on notes supplied by the Merrill Company: Preparation of Gold Pregnant Solutions for Precipitation Clennell The Cyanide Process of Gold Extraction by James Park and Manual of Cyanidation, by E. The following equation represents the probable reaction:įor more details see Cyanide Handbook, by J. ![]() KAu(CN)2 + 2KCN + Zn + H2O = K2Zn(CN)4 + Au + H + KOHīut that the reaction between zinc and cyanide takes place independently and bears no necessary proportion to it.
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