Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1985-12-06
1988-03-29
Stoll, Robert L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204128, 75101R, 75108, 75118R, 423 38, 423 39, 423 42, 423 46, 423500, C22B 1104, C25B 124
Patent
active
047341718
ABSTRACT:
An improved process for recovering gold from gold-containing materials by iodide/iodine leaching is provided wherein the pregnant lixiviant containing solubilized gold and iodine is treated in an electrolytic cell to reduce gold in solution to elemental gold for recovery and reduce iodine to iodide at the cathode, so as to prevent iodine from interfering with subsequent gold recovery processes, and at the same time reoxidize iodide present at the anode to elemental iodine to regenerate the leach solution to the desired iodide:iodine weight ratio, e.g. about 2:1 to about 10:1. Gold is precipitated in the cathode compartment, and if desired, the cathode effluent may be treated for further removal of traces of gold before being passed to the anode compartment. A method for preventing iron contamination of the cathode is also provided comprising buffering the lixiviant solution to a pH of about 5.
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In-Situ, Inc.
Stoll Robert L.
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