Heap Leaching

Heap Leaching is a process used to treat the gold mine with low grade. It has the following features

• Simple process
• Easy operation
• Low energy consumption
• Investment saving & effective
• Scale can be chosen, and the maximum scale can be a million tons /day.

Technology Process
The heap leaching process comprises concrete of the site, pre-processing of the ore (crush or produce), concrete heap, spray leaching, disinfecting, and discharge of the recovery of gold from pregnant solution.

Raw Ore Processing 
After the raw ore is ground by jaw crusher and cone crusher, the particles become (30-50mm), and are put into concrete directly; fine particles need to be produced (make the fine particles become the rough particles), then transport the mineral by forklift truck to the concrete heap.

Spray System
Put a spray system above the heap. After the cyanide solution and heap react, the pregnant solution exudes from the heap and flows into the pregnant tank, then infiltrates into the absorption column by the pregnant solution pump. The solution rest is the barren solution. The barren solution returned to the spray system for recycling.
Desorption and Electrowinning 
With high temperature and high pressure in the desorption and electrowinning, the gold pulp comes out, and after smelting, comes out the gold bullion. The main equipment in heap leaching includes jaw crusher, cone crusher, spray device， desorption and electrowinning, smelting device, etc.