There are many types of non-metallic minerals associated with gold ore, and non-metallic minerals that have an effect on the cyanide leaching of gold are:
1. Arsenic minerals In gold ore, arsenic-containing minerals are extremely harmful to the cyanidation process. Sometimes the cyanidation process is not even possible.
Arsenic is often present in gold ore as sulfides (realgar, orpiment, arsenopyrite, etc.), which are highly soluble in alkaline cyanide solutions.
Sulfide minerals of arsenic decompose to consume oxygen and cyanide in the pulp to reduce the dissolution rate of gold, and the products formed by decomposition in the alkaline pulp are in contact with the surface of gold, and a film is formed on the surface of the gold particles, which seriously hinders gold, The interaction of oxygen and cyanide.
2. Selenium minerals Selenium is dissolved in cyanide solution to form selenium cyanide (NaCNSe), which increases the consumption of cyanide and brings difficulties to the next replacement operation, but selenium has little effect on the dissolution rate of gold.
3. Tellurium minerals gold ores, minerals tellurium Te gold (AuTe 2) bismuth and tellurium (Bi 2 Te). Bismuth minerals are difficult to dissolve in cyanide solutions, but niobium minerals can be treated by cyanidation under fine grinding, high alkali and high aeration conditions.
In the cyanide solution, strontium is dissolved to form sodium telluride (Na 2 Te), which in turn produces a tellurite. As a result, the cyanide is decomposed and absorbs oxygen in the solution, which is disadvantageous for cyanidation.
4. Carbonaceous minerals When the carbonaceous ore is treated by the cyanidation process, the dissolved gold is prematurely adsorbed on the carbon and lost with the tailings. Therefore, before cyanidation, appropriate methods must be used to eliminate the adverse effects of carbon.
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