Acid washing has proven to be a very cost-effective means of maintaining the activity of activated carbon. During operation, carbon will typically become fouled due to an accumulation of precipitated mineral salts. This reduces the carbon particle area available for gold and silver adsorption. Cyanide leaching and carbon adsorption systems are typically saturated with scale forming minerals, due to the presence of lime and resultant high pH environment. Operational problems associated with scale buildup include reduced carbon loading capacity, reduced gold recovery, and poor stripping circuit performance.

Denver Mineral Engineers’ acid wash systems remove mineral scale from carbon by circulating a dilute acid solution through a static bed of carbon. The acid removes the scale by dissolving it back into solution.
Inherently, during the acid wash process, small amounts of sodium cyanide are contacted by acid. This results in the formation of potentially deadly hydrogen cyanide gas. The systems are designed to safely handle the conditions, but proper operating procedures must be followed.

SPECIFICATIONS
FEATURES Nitric or Hydrochloric Acid Compatible Completely Modular System Ready To Operate Manway Hub and Lateral Feed Distributor Wedge Wire Collection Header Pipes, Valves and Fittings Magnetic Drive Pump Acid Resistant Paint Caged Access Ladder O & M Manual ASME Code Vessel Electrical Panel Drum Pump OPTIONS Carbon Transfer Pumps Transport Trailer Eductors Cone Bottom Holding Tanks Flexble Transfer Hoses Vent Fans Duct Work	OPTIONS Carbon Transfer Pumps Transport Trailer Eductors Cone Bottom Holding Tanks Flexble Transfer Hoses Vent Fans Duct Work
	Carbon Capacity Vessel Size Circulation Tank (gallons) 1/2 Ton 1 Ton 2 Ton 3 Ton 4 Ton 6 Ton 8 Ton 10 Ton 12 Ton