Recovery of cobalt, molybdenum, nickel and vanadium from an aqueous ammonia and ammonium salt solution by serial extraction of nickel and cobalt and coextracting molybdenum and vanadium

摘要

A method of recovering metal values from an aqueous stream. The metal valves are preferably obtained from leaching spent hydroprocessing catalysts, and include cobalt, nickel, molybdenum and vanadium. The metal values are extracted, isolated, and purified by liquid extraction techniques.