High Capacity Crusher

When the non-choking feature was being applied to existing crushers of the gyratory type, it was found that in several crushing machines, the attendant reduction in receiving opening could be partially offset by sloping the straight portion of the concaves at a wider angle than that for which the top shell was originally designed, because … Read more

Arsenic and Antimony Sulphide Minerals in Cyanidation

The successful cyanidation of gold ores containing appreciable amounts of arsenic or antimony sulphide minerals such as orpiment, realgar, and stibnite is usually difficult or even impossible. Extractions are low and the solutions soon become ‘foul.’ The gold in such ores could be free and uncoated, and no trouble in dissolving it in clean cyanide … Read more

How Copper Affects Cyanidation & Leaching

Many precious metal ores contain copper minerals in various amounts. These copper minerals dissolve in cyanide solutions to a greater or lesser degree depending on the particular copper mineral or minerals present, their fineness, and the dissolving effect of the cyanide solutions. In the process of dissolution the copper combines with, or as it is … Read more

Mineral Comminution Circuits: Their Operation and Optimisation

Start following 911Metallurgy’s Linkedin page to get a free (my used) copy of: Mineral Comminution Circuits: Their Operation and Optimisation I will select a winner from All the Company’s Followers on September 17th 2016 and announce the winner on 911Metallurgy’s Linkedin page Contact via Linkedin will be attempted with the winner and if not reply … Read more

Process of Cyanide Gold Extraction

Here I present an Process EXAMPLE of Gold Extraction Cyanide in which the cyanidation feed consists of a pyrite concentrate floated after the selective flotation of a copper-gold concentrate. The pyrite concentrate is reground to 90% minus 325 mesh and aerated in a high-lime solution prior to cyanidation. It contains 99% sulphides of which 10 to … Read more