Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1977-09-08
1978-06-06
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204108, 75117, 75119, 75109, C25B 122, C25C 112
Patent
active
040935264
ABSTRACT:
A multi-stage leaching process is provided for leaching and refining nickel-copper-sulfur concentrates, a substantial portion of the total nickel present being in an acid-soluble metallic form. The process employs a first stage atmospheric leach in combination with two serially coupled second and third stage high pressure oxidation leaching steps in which process streams are recycled within the overall process, such that a purified nickel solution is continually drawn from atmospheric leach and a purified copper product recovered from a pregnant solution obtained in the third stage leach, a spent copper-sulfuric acid being formed which is recycled back into the process for the recovery of metal values therefrom.
REFERENCES:
patent: 3293027 (1966-12-01), Mackiw et al.
patent: 3652265 (1972-03-01), Marschik et al.
patent: 3741752 (1973-06-01), Evans et al.
patent: 3962051 (1976-06-01), Symens et al.
Blanco Jorge L.
Crnojevich Ranko P.
Simons Courtney S.
Amax Inc.
Andrews R. L.
Ciomek Michael A.
Kalil Eugene J.
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