The gold leaching( carbon in leach) process has been widely used in newly built gold leaching plants in recent years, and many plants are changing into CIL as well. The gold-leaching CIL process is suitable for treating oxidized gold ore with low sulfur and mud content. It is unsuitable for the gold ore with high-grade silver. Generally, the proportion of gold and silver should not exceed 1:5. The best conditions for the CIL process in China: PH=10-12, sodium cyanide concentration is not less than 0.015%, the particle size of activated carbon is 1.0-3.35mm, the type of carbon is coconut shell activated carbon, and the slurry concentration is 40-45%.
Gold Leaching Methods: Flotation, carbon pulp adsorption, gravity beneficiation, etc. These three methods of the leaching process and gold mining equipment manufacturing can be completed independently. Gravity separation and flotation are the common beneficiation methods used in gold ores, and great improvements have been made in the beneficiation technology and equipment. The mainstream gold extraction methods are generally by crusher, then comminuted by the ball mill, and then through gravity separation and flotation technology, the concentrate and tailings are extracted, chemically refined, and refined to produce gold.
Gold Leaching( carbon in leach) was developed from CIP( Carbon In Pulp) and is characterized by less process flow, and timesaver in the leaching process, thus reducing the production expenditure. Besides, advanced extraction technology improves the efficiency of gold extraction. The CIL production line is wider use than CIP in the mineral industry.
Gold Processing Steps, Introduction of gold CIL production line:
A. RAW MATERIAL PREPARATION:
vibration feeder- conveyor belt- crusher -Crushing- grinding- leaching- desorption electrolysis- tailings dehydration
B. LEACHING and elimination:
The thickened material is leached from eight agitators; a qualified reagent is added to the first set of agitators, and the activated carbon is lifted from the last set of agitators to the second set of agitators via an airlift to resist electric currents. The activated carbon from the second set of agitators is raised to a carbon screen to obtain gold-loaded carbon, and the remaining slurry is returned to the first set of agitators And then into the tailwater treatment phase.
C. Tail Water Treatment:
The tailings will be raised to a pressure filter, filter cake known as tailings, through the belt conveyor and truck transport to the yard, filtrate into the circulating water tank for reuse.
D. AURIFEROUS CARBON TREATMENT:
Gold powder is obtained by batch treatment of gold-containing carbon by desorption and electrolysis equipment. The dust enters the furnace and turns to the bar. The gold-containing carbon after electrolysis can be returned to the final stage of the reprocessing flowchart.
The parameters of each equipment are selected according to the processing capacity of the concentrator.
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