Effect of non-metallic minerals in gold ore on cyanide leaching of gold
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:
Light range of conveyors is developed to convey grains, seeds, pigments, additives and meal
type of products where material is free flowing and less abrasive environment. Bush chain with bolted UHMWPE paddle is used
to convey materials, which run on bottom plate and return brackets. UHMWPE
bottom and top liners are available on request.
Due to its design and product nature, these conveyors can operate at
high chain speed.
Conveyor casings and bolt holes are cut using CNS
laser machines and folded. These conveyors are specifically designed to reduce
fabrication and assembly duration, which makes them very economical.
Chain conveyors can be designed in a horizontal,
inclined, or in vertical arrangement. Conveyor`s bottom and side panels are
made off 3mm folded galvanized sheets with 2mm top cover. Drive and tail units fitted with flanged
bearing housings with lip seals, Plummer block bearing housing are also
available on request.
Hardened head end and tail sprockets are mounted
with keys.
Conveyor roller chains and standard sprockets are
widely used for these applications.
Tail end comes with adjustable screw take up in
standard design; self-cleaning tail end with screw adjustment on driven is
available for food products.
Grain Chain Conveyor,Rice Drag Chain Conveyor,Light Duty Chain Conveyor,Light Duty Drag Chain Conveyor Quantum Conveying Systems Yangzhou Co.,Ltd. , https://www.fkconveyor.com
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.