Introduction to the stirring cyanide method of gold cyanide leaching process

Cyanide gold extraction is a very commonly used method of gold extraction in China. It is welcomed by many people because of its low cost and high recovery rate of gold cyanide. It can realize the production of gold and basically avoid the various disadvantages caused by the long-distance transportation of gold concentrates, and it is also conducive to improving the economic efficiency of enterprises and saving costs.However, its disadvantage is that cyanide is a highly toxic agent, the process is long, and the extraction speed of gold is slow.In order to adapt to different types of gold-containing ores, improve the recovery rate of gold, and reduce costs, the gold extraction process by cyanide method has been continuously innovated.

The initial mineral processing technology was not in place and the cost of fine grinding of ore was high. At that time, the continuous leaching and dehydration and filtration methods of large quantities of ore had not yet been developed.Therefore, in the early stage of the development of cyanide method, it was mainly based on the method of leaching and leaching.Percolation leaching is only suitable for the treatment of coarse-grained ores. It is required that clay, ore mud, etc. are not allowed in the material. Therefore, the finely crushed ore should be graded before leaching, which is the process of panning, separating the ore mud, and placing the coarse mud product in the leaching tank. Cyanide treatment by percolation method.With the improvement of hydrometallurgical equipment, slurry mixing tanks, filters, thickeners, etc. have been continuously developed. In addition to leaching and leaching of ore sand, the separated ore mud products can be cyanidated by mixing tanks.With the advancement and improvement of grinding, concentration and filtration technology, cyanide leaching has turned to extracting gold from fine-grained gold ore, and all the ore has been finely ground and leached in a strongly stirred tank.This method is called the full "mud cyanide" method.It has the advantages of high recovery rate, fast gold immersion speed, and short gold withdrawal cycle, so it has been quickly popularized and used.

Gold cyanide by stirring cyanide method was first used to oxidize gold by bubbling air. Later, with the scientific development of gold extraction and people's understanding of the importance of oxygen in leaching, leaching processes such as oxygen-rich leaching and liquid-phase oxidant-assisted leaching also came into being, such as hydrogen peroxide or potassium permanganate leaching, ammonia cyanide leaching, heating and pressurizing leaching, and lead nitrate leaching.