The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1978
Filed:
Sep. 08, 1977
Jorge L Blanco, New Orleans, LA (US);
Ranko P Crnojevich, Gretna, LA (US);
Courtney S Simons, Weston, CT (US);
Amax Inc., Greenwich, CT (US);
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.