PSA Oxygen Generators For Gold Mining

4 Au + 8 NaCN + O2 + 2H2O - 4 NaAu(CN)2 + 4 NaOH

A slurry of ground ore is mixed with cyanide in the presence of activated carbon. The carbon has a very high affinity for the gold-cyanide complex and adsorbs the gold from solution, resulting in very high loadings on the carbon (typically 1000 – 4000 g/t). At the end of leaching, the loaded carbon is removed from the slurry and the adsorbed gold is stripped using a sodium hydroxide and cyanide solution at high temperature and pressure to form a high value electrolyte solution. The gold bullion is then recovered from the electrolyte by electrolysis. Since insufficient dissolved oxygen in the solution slows leaching, gaseous oxygen is bubbled into the slurry to increase the dissolved oxygen concentration. A close oxygen-slurry contactor is used to increase the partial pressure of oxygen in contact with the solution to a concentration significantly above the saturation level at atmospheric pressure.

PSA Oxygen Generators For Gold Mining Leaching Principles

Air compression: The air is first compressed to a higher pressure by a compressor to improve the separation efficiency.
Adsorption separation: The compressed air passes through an adsorption tower containing a special molecular sieve adsorbent. The molecular sieve can selectively adsorb nitrogen molecules in the air, while allowing oxygen and a small amount of other gases to permeate through.
Desorption regeneration: When the adsorbent has adsorbed enough nitrogen, the system will switch to another adsorption tower, and at the same time, the adsorption tower will be decompressed and desorbed to release the adsorbed nitrogen and regenerate the adsorbent.
Oxygen-rich gas output: The oxygen-rich gas (usually 90-95% purity) that permeates the adsorption tower is collected and transported to the gold leaching system to provide the required oxygen for oxidizing and dissolving gold.
Cyclic process: The above steps are alternately cycled between two or more adsorption towers to achieve continuous and uninterrupted production of oxygen-rich gas.

PSA oxygen generator does not require cryogenic liquefaction, has a relatively simple process, and consumes less energy. It is an ideal oxygen source for gold leaching systems. Through automatic control, the oxygen purity and output can be adjusted according to demand.

Hot Tags: psa oxygen generators for gold mining, China psa oxygen generators for gold mining , suppliers, factory, Nitrogen Compressor, Liquid Argon Equipment, up oxygen plant, Psa Oxygen Plant, Co2 Processing Plant, Containerized Nitrogen Plant