leaching experiments. The leaching was implemented using sodium cyanide with concentration in the range of 500 – 1200 ppm, the pH of the reaction mixture was maintained in the range of 10.2 to 10.5 by addition of 5 g of lime CaO . The retention time spanned the range of 24 to 96 hours.
The reactions that take place during the dissolution of gold in cyanide solutions under normal conditions have been fairly definitely established. Most agree that the overall cyanide equation for leaching and cyanidation of gold is as follows: 4 Au 8 NaCN O2 2 H20 = 4 NaAu CN 2 4 NaOH
Therefore, the results imply that intensive agitation together with oxygen purging can significantly enhance the gold extraction rate. In the cyanide leaching experiment, which was run to compare the gold leaching efficiency of cyanide-free glycine media, only 80% of gold could be extracted in the presence of 0.75 g/L NaCN.
experiments done on cyanide leaching of gold. Oct , liberation cyanide leaching will only be effective if the cyanide can come in contact with the gold particle for this to happen, the ore should either be sufficiently porous for cyanide to reach the gold, or more usually the ore is crushed and ground to a size at which the surface of the gold is exposed iE the gold is liberated
Pit C . Design of Experiment DOE was employed to design leaching bottle roll test, model and evaluate the influence of particle size, cyanide concentration and leaching time on the cyanidation of the three pit samples. The particle size, cyanide concentration and leaching time were varied from d 80 of 150 to 75 µm,
cyanide leaching, the studied gold ore can be classiﬁed according to La Brooy et al. 1994 as mildly refractory, i.e. gold extraction in con- ventional cyanidation is 80–90%.
The gold is mixed with the sodium cyanide which leads to the following Elsener’s equation and reaction. This is done to make soluble gold; Now the gold is soluble. This method of making soluble gold is known as leaching. In the process of leaching, a dilute form of sodium cyanide is added into the ore containing the gold.
Gold Cyanide Solution Leaching Gold With Cyanide Since the 1890& 39;s, cyanide has been used to recover gold from gold bearing ores. And today, over 115 years later, most of the worlds gold is recovered with cyanide playing a large part in the beneficiation of the yellow precious metal.