Gold mine flotation process

1. Flotation + cyanide leaching of concentrate

This method is often used to treat gold-bearing quartz veins and gold-bearing pyrite quartz veins of gold mines. Generally, xanthate is used as collector, pine alcohol oil is used as foaming agent, and weakly alkaline pulp is flotated in a flotation machine to obtain gold concentrate. The flotation concentrate is then subjected to cyanide leaching, the gold is dissolved by cyanide, the complex enters the solution, and then zinc powder is used to replace it to obtain gold mud. Finally, the gold mud is pyrometallurgically smelted to obtain pure gold.

2. Flotation + concentrate thiourea leaching

For vein gold ores with high arsenic and sulfur content or high carbon and muddy content, Flotation process is a method of obtaining gold-containing sulfide concentrate, and then leaching the flotation concentrate with thiourea to recover gold. The thiourea method for gold extraction is an increasingly perfect low-cost method. The new process of extracting gold by poison, thiourea acidic liquid dissolves gold and silver at a high speed, has low toxicity and is easy to regenerate. Mineral components such as antimony, arsenic, copper, and sulfur are not sensitive to gold extraction with thiourea, but they will affect gold extraction by cyanide. Therefore, thiourea leaching can extract gold and silver from gold-containing mineral raw materials that are difficult to process by cyanide. At the same time, the thiourea gold leaching time is generally much shorter than the cyanide gold leaching time.

3. Flotation + mercury amalgamation

The mercury amalgamation method is used to recover gold, and is generally suitable for processing natural gold particles (or Free gold) Coarse, oxidized ore and quartz primary ore close to the surface. Gold particle size is an important factor in determining amalgam recovery. The particle size limit suitable for mercury amalgamation for gold selection is 0.2~0.03 mm. The process of mercury amalgamation for gold selection is simple, easy to operate, low in cost and quick to produce results. For mines with gold-containing non-ferrous metal ores, mercury amalgamation operations should be adopted after it is found that the free gold in the ore has good particle size and properties, is large in quantity, and has no harmful impurities for mercuryization.

4. Flotation + concentrate roasting + high acid washing + cyanide leaching

For Flotation concentrates containing high arsenic and sulfur content. After flotation of cyanide tailings, sulfur, iron, arsenic and other impurities are enriched into the concentrates, becoming difficult-to-select high-sulfur and high-arsenic concentrates that cannot be cyanated directly. During leaching, the flotation gold concentrate can be oxidized and roasted first to remove arsenic and sulfur. In this way, the roasted sand has a loose structure, which is more conducive to the leaching of gold and silver. After that, it can be pre-treated and washed with high acid, and most of the magazines will be The acid is dissolved and removed by washing to ensure the cyanide leaching rate and effectively enrich the gold grade.