PLANTAS DE SX

PLANTAS DE EW

LIXIVIACIÓN

HIDROMET

COALESCEDORES

     SX Kinetics has the expertise to design and manufacture gold electrowinning plants for the recovery of gold from sodium cyanide solutions.

Description Process:

Lean electrolyte containing 10 to 20 g/L sodium cyanide at pH >10.5 (adjusted with sodium hydroxide) is heated to 90°C and pumped up flow at 2 bed volumes perhour through a stationary bed of activated carbon loaded with gold. The gold that was adsorbed on the carbon as a sodium-gold cyanide complex (NaAu(CN)₂) will be desorbed (eluted) from the carbon by a reversal of the adsorption mechanism. The solution exiting the top of the column (know as rich electrolyte) will flow by gravity into the electrowinning cell and the gold will be recovered by plating onto steel wool cathodes. The lean electrolyte will flow from the electrowinning cell by gravity into an electrolyte tank where the concentration of sodium cyanide and sodium hydroxide can be adjusted prior to pumping it through the circulation heater (for reheating to up to 90°C) and back to the column for reuse.

Schematic diagram of a process to recover gold from cyanide solutions by carbon adsorption and electrowinning onto steel wool cathodes.

 

Para más detalles: Piloto EW de las plantas 12

    0 to 800 A and 0 to 4 V Rectifier

EW cell with 15 cathode boxes and 16 anodes

Para más detalles: Piloto EW de las plantas 11

Para más detalles: Piloto EW de las plantas 13

This electrowinning pilot plant was coupled to a scale scale heap leaching operation and recovered gold directly from the leach solution.