How to carry out gold pretreatment in refractory gold mines to reduce the influence of the “gold robbing” effect

Reasons why it is difficult to deal with refractory gold ore

The so-called refractory gold ore generally refers to a type of ore in which gold cannot be effectively leached by the cyanidation equipment without pretreatment even under fine grinding conditions. The gold of this type of ore is mostly encapsulated in associated minerals and gangue minerals in fine particles, so it cannot be in contact with the cyanide solution and dissolved oxygen, which is the main reason why part of the gold cannot be directly extracted by cyanidation. In addition, copper, cobalt, and iron base metal sulfides in the ore consume cyanide contact, which is the main reason why part of the gold cannot be directly extracted by cyanidation.

The necessity of the pretreatment process

In addition, cyanide-consuming oxygen-consuming substances such as copper, cobalt, and iron base metal sulfides in the ore easily react with cyanide and dissolved oxygen in the solution, resulting in unnecessary consumption of cyanide and dissolved oxygen; conductive minerals containing antimony and other elements are easily The cathodic dissolution reaction of gold is slow, and the activated carbon-type organic carbon, clay and other “golden” substances can easily adsorb gold and cyanide to form coordination compounds during the gold leaching process, causing unnecessary loss of gold and thus the gold leaching process. In summary, the pretreatment process of refractory gold ore before cyanide leaching is very necessary.

The pretreatment method of refractory gold ore

The main purpose of the pretreatment of refractory gold ore is to assist leaching to increase the leaching rate of gold, which is mainly achieved through the following two ways: one is that the wrapped fine-grained gold is exposed or partly exposed, for gold encapsulated in sulfide ore type The essence of gold ore is to oxidize the sulfide of the gold to make it form a porous oxide and roast it, so that the cyanide and dissolved oxygen have the opportunity to contact and react with the fine gold particles to make the gold change from the solid phase to the liquid phase; The second is to remove cyanide-consuming oxygen-consuming substances and active organic carbon in advance, or change its physical and chemical properties to make it or weaken its “golden” effect, so as to increase the recovery rate.

After pretreatment of refractory gold mines, it is found that the influence of “gold robbing” has been weakened. How to improve the efficiency of gold ore beneficiation equipment? Under advanced social conditions, it is necessary to improve and improve the beneficiation equipment and beneficiation technology. Therefore, the development The new process is very effective for improving the efficiency of the beneficiation of refractory gold.

Keywords:Refractory gold leaching equipment, price, supplier, pretreatment method