Gold and silver beneficiation process technology

The main features of gold-containing ore flotation is floating gold (gold content in the ore is very small), especially in the presence of arsenopyrite recovery or pyrite gold particles, they may be selected from the sulphide concentrate in. The gold-containing sulfide concentrate obtained by flotation, if it can be leached with the condensate, is leached after fine grinding; if it cannot be scented, it must be burned or smelted.

In general, it is possible to use flotation in gold ore under the following conditions.

1 gold and sulfide are closely symbiotic.

2 Gold is not mostly symbiotic with sulfides. However, the presence of a sufficient amount of sulfide minerals in the ore ensures a stable gold-containing sulfide mineralized foam.

3 The ore does not contain sulfides, but contains a large amount of iron oxide (such as iron caps). At this time, the rock mud contained in the ore acts as a foam stabilizer.

4 The ore does not contain sulfide or iron oxide. But containing buoyant and able to stabilize the foam minerals (e.g. sericite).

3 pure quartz gold ore before mixing with sulfide ore; or adding sulfide minerals ((3%); or form a stable foam after adding appropriate agents.

6 After recovering the main valuable components ( copper , lead , arsenic, etc.) in the ore by flotation, the tailings are further subjected to atmospheric treatment.

3. Xanthate and black medicine are effective collectors for gold.

Lime, like, and sodium sulfide are inhibitors of gold.

The role of cyanide is to dissolve the hydrophobic xanthate gold formed on the surface of the mineral, which is inhibited.

The role of sodium sulfide is mainly to reduce the amount of xanthate adsorbed on the mineral surface. For some mildly oxidized sulfide ores, the addition of sodium sulphide will reduce the recovery of gold; but for strongly oxidized sulphide ore, the addition of sodium sulphide is beneficial to improve concentrate quality and recovery.

Mixing the collector can improve the flotation effect, increase the recovery rate and flotation rate of useful minerals in the foam product, and reduce the amount of collector. The combination of high-grade and low-grade xanthate can improve the flotation of gold-containing sulfides that have just begun to oxidize. In the case of flotation of natural gold, a mixture of two kinds of collectors is used in a certain ratio, and the result is more than that used alone. The result of any kind of collector should be good. In particular, when the ore contains a hard-to-float sulfide, the mixed drug is more important. The effect of the mixed use of the collector increases as the hydrocarbon chain length of one of the collectors increases.

It has also been reported that in the process of flotation of sulfide ore (Cu, Pb) with xanthate, the addition of non-polar oils such as spindle oil, high pressure oil, industrial lubricating oil and crude oil can enhance the flotation process and clearly Improve the flotation process indicators. This obviously can be explained by the fact that the non-polar collector can improve the conditions for the attachment of the ore particles to the bubbles, thereby improving the sorting effect.

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