in gold processing: cyanidation …steel wool or by the merrill-crowe process.in the latter process the gold-bearing solution is deoxygenated and passed through a filter-press where the gold is displaced from solution by reduction with zinc metal powder.
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the merrill–crowe process is a separation technique for removing gold from the solution obtained by the cyanide leaching of gold ores. it is an improvement of the macarthur-forrest process where an additional vacuum is managed to remove air in the solution (invention of crowe) and zinc dust is used instead of zinc shavings (improvement of
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the merrill-crowe process has been around since the early 1900’s when it was discovered that when a cyanide-gold solution had the dissolved oxygen reduced to 1 part per million gold readily precipitated from solution as the cn has a stronger attraction to zinc than gold so it drops the gold and attaches to the zinc leaving cn-zn and au.
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efficient merrill crowe precipitation of gold and silver is dependent upon the proper control of certain physical and chemical properties of the solution. the most important of these properties are listed below: suspended solids such as ore slime and precipitates of calcium carbonate with hydrates of aluminum magnesium and iron present in the pregnant solution before clarification.