Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1990-01-22
1991-04-23
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204252, C25C 120, C25C 700
Patent
active
050097555
ABSTRACT:
A process for purifying and refining gold from wastes and ores is disclosed. The gold to be refined is made the anode in an electroytic cell against an inert cathode. The electrolyte, essentially consists of an impregnated ammonium chloride solution. The impregnant is a nascent-oxygen source for leveling the gold overvoltage at the anode. The cathode is isolated from the gold-containing liquidus by a semi-permeable membrane. The ammonium chloride electrolyte serves as a solvent for the dissolved gold and also complexes with any silver and/or copper commonly found in the impure anode gold. The precipitation of the pure gold at 99.5'% purity is described. The anode is enclosed in an ion permeable bag for collecting any impurities which are insoluble in the gold-containing electrolyte. The pregnant electrolyte, the method and an apparatus for practicing the invention are described.
REFERENCES:
patent: 4895626 (1990-01-01), Shor
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