In the process of flotation, the gold particles are easy to fall off from the bubble surface after contact with the bubbles. ④In oxidized ores, the surface of gold particles is often contaminated or covered by iron oxides.
The three most commonly used processes for gold ore separation are: gravity separation, flotation and cyanidation. Among them, gravity separation is a commonly used process in placer gold mines, flotation is mostly used in rock gold mines, and cyanidation is suitable for refractory gold ores such as oxide ore and flotation concentrate.
How Is Gold Extracted From Gold Ore Sciencing. Yet another gold removal process is flotation.the ground ore is put into a solution that contains a frothing agent along with a collecting agent and organic chemicals.the frothing agent turns the solution into a foam.the collecting agent bonds to the gold, creating an oily film that will later attach itself to the surface of air bubbles.
Based on the properties of gold ore, several effects, such as grinding fineness, system of flotation pharmaceutical, were researched in the flotation experiment. The results showed that with the grinding fineness-0.074mm 65%, pH=8.5, 2# oil 60 g/t, butylxanthate 140 g/t and Butylamine black medicine 50 g/t, good indexes were obtained as the following: grade of Au rough concentrate is3.24g/t, recovery of Au is 36.90%.
The common gold extraction processes include gravity separation process, froth flotation process, cyanidation, etc. Froth flotation process is the most widely used in gold extraction, but for different types of gold, we can choose flotation process combined processin order to improve the return on investment.
The flotation method is a widely used technique for the recovery of gold from gold-containing copper ores, base metal ores, copper-nickel ores, platinum group ores and many other ores where other processes are not applicable.
For example, in gold ore flotation, when the fine particles of gold ore do not meet the standards, and the amount of foaming agent is added too large, it will makes the pH value of the pulp and the concentration of the pulp increase, and a large amount of foam to be generated, finally resulting in poor flotation results and large tail loss.