Figure 1 Anode slime generation from the primary ore. The main objective of this work was to evaluate and identify what are the best experimental conditions for extracting gold, silver and copper of anode slime generated during the copper electrorefining through oxidative hydrometallurgical processes.
The ground up ore is mixed with water to create a slurry, which is mixed with surfactants to increase the golds hydrophobicity. This mixture is placed into a tank or flotation cell filled with distilled water. Air bubbles are pumped into the flotation cell and the water is agitated.
The required silver extraction process varies from the different mineral nature. The mineral extraction method usually used for independent silver ore centering on silver production is flotation extraction process. While paragenetic and associated silver mines often uses ingle flotation method, flotation gravity separation method, and flotation cyanidation method, with flotation being the most important process.
Cyanidation is usually the most suitable process, but it often necessitates grinding ore to a fine size to release the gold and silver. Where it is possible to obtain a good recovery by flotation in a concentrate carrying most of the pyrite or other sulphides, it is often more economical to adopt this method, regrinding only the comparatively small bulk of concentrate prior to the leaching operation.
A total recovery of more than 97% of the gold and silver is made by flotation, while the combined flotation cyanidation process gives an overall extraction of 95%. The installation is much more compact and its capital cost far less than one embodying fine grinding and cyaniding of the whole tonnage, and it can be run with lower operating, maintenance, and depreciation costs.
First, ore is ground into an extremely fine powder. The powdered ore is mixed with water to create a slurry, which is mixed with surfactants to increase the golds hydrophobicity. This mixture is placed into a large tank filled with distilled water. Air bubbles are pumped into the tank and the water is agitated.
June 10, 2020
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