The adsorption process can proceed:
-> At low temperatures and atmospheric pressure: conventional desorption process is conducted at room temperature and atmospheric pressure 90-1000C, however long desorption time more.
-> At high temperatures and high pressures. Desorption temperature may rise to 120-1500 C to shorten the duration of desorption. However the pressure in the system must be increased to 2-5 at. + Gold recovery stage: Gold is moving from soluble form into a liquid metal gold. There are two alternatives are commonly applied are: -> Cement goods by zinc powder. This is the traditional process to recover gold from solution known as the Merrill-Crowe process. After a solution containing gold is separated from the solvent extraction process of washing the solid phase with upstream (counter-current decantation CCD) or a filter press, and then go through the reduction of dissolved oxygen before being turned by cement chip or powder cream. Gold is precipitated onto zinc and separated from the solution. -> Electrolysis: containing gold cyanide solution is pumped through the chamber circulating electrolyte. Gold is deposited on the cathode or the anode mud form. + Phase refined gold: Gold in the product recall process above gold and silver is separated from the other impurities to obtain pure metal gold.
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