Sodium cyanide is the most commonly used leaching chemical in gold extraction process. According to theoretical calculation, leaching 1 gram of gold only requires 0.5 grams of sodium cyanide. However, in most gold cyanidation plants, the consumption of cyanide is high, which is 50 100 times higher than the theoretical calculation.
The triumphal march of the currently dominating gold cyanide leaching process started from the deep Witwatersrand ore. With cyanide leaching, gold extraction could be increased from 55 65%90% .
Gold cyanidation is a hydrometallurgical technique for extracting gold from low grade ore by converting the gold to a water soluble coordination complex. It is the most commonly used leaching process for gold extraction.
The best gold extractions and lowest cyanide consumption were reached when no ferrocyanide was found in the solution after 6 hr. In the presence of the optimum lead concentration, a starting pH of about 9.6 using about 2 lb. lime per ton, in the presence of suitable buffers, gave the best results.
The O series can compete sodium cyanide easily in most rock ore processing including gold leaching rate , agent consumption and leaching time ; but the most advantage of the O series is it is low toxic and is classified as ordinary goods and can be purchased, transport, storage and usage without restriction.
The Heap Leach Process Briefly stated, gold heap leaching is a hydrometallurgical process designed to treat amenable low grade gold ores that contain roughly 0.5 gram per metric ton gold to 1.5 g/t gold . The ore is stacked by various types of equipment
The heap leaching method is mainly suitable for low grade gold ore recovery, with the average grade of gold ore is 0.8 1.5g/t. Heap leaching gold recovery process is to first crush the ore to certain particle size and then convey it to the storage hopper, adding gold ore, lime and binder according to the specified amount, mixing them thoroughly and sending the gold ore to the disc granulator.
Plant design parameters for gold extraction, leach residence time and cyanide consumption are generally determined from standard bench scale bottle roll or agitation leach tests. The application of laboratory data to process design has essentially evolved from the testing of oxide or low cyanide consuming ores. Such scale up factors may not be appropriate for ores that deplete cyanide and ...
June 10, 2020
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