The present invention relates to a process for recovering one or more metal ions selected from the group consisting of Cobalt, Nickel, Manganese and a mixture thereof from metal-containing residues comprising: A) leaching the residue with a leaching solution comprising lactic acid to obtain a filtrate 1 and a solid cake 1; B) separating the filtrate 1; C) precipitating the Cobalt lactate, Nickel lactate or Manganese lactate from the filtrate 1 to obtain a filtrate 2 and a precipitate 1; and D) separating the precipitate 1; or alternatively, A) leaching the residue with the leaching solution to obtain a filtrate 1 and a solid cake 1; E) precipitating the Cobalt lactate, Nickel lactate or Manganese lactate from the filtrate 1 to obtain a filtrate 3 and a solid cake 2; and F) separating the solid cake 2; and G) separating the Cobalt lactate, Nickel lactate or Manganese lactate from the solid cake 2.

A method for the selective precipitation and recovery of manganese from a manganese containing solution, such as a geothermal brine is provided, wherein the geothermal brine is contacted with ammonia, an ammine, or ammonium salt at a pH of greater than about 8.0 to selectively precipitate manganese having a purity of at least about 95%. Also provided are methods for the selective recovery of manganese and zinc from a brine solution.

In a method of selectively recovering a valuable metal from lithium secondary battery waste, a complex oxide is separated from a lithium secondary battery waste powder. The powder is dissolved in sulfuric acid. The solution is separated into a solution and a residue by solid-liquid separation. The solution is subjected to solid-liquid separation to produce a solution and a solid. Valuable metal manganese is extracted from the solution by solvent extraction, and the remaining valuable metals including cobalt, nickel, and lithium are separated into a first raffinate. Valuable metal cobalt is extracted from the first raffinate by solvent extraction, and the remaining valuable metals are separated into a second raffinate. Valuable metal nickel is extracted from the second raffinate by solvent extraction, and the remaining valuable metal lithium is separated into a third raffinate. Valuable metal lithium is extracted and concentrated from the third raffinate.

The present invention relates to a process for recovering one or more metal ions selected from the group consisting of Cobalt, Nickel, Manganese and a mixture thereof from metal-containing residues comprising: A) leaching the residue with a leaching solution comprising lactic acid to obtain a filtrate 1 and a solid cake 1; B) separating the filtrate 1; C) precipitating the Cobalt lactate, Nickel lactate or Manganese lactate from the filtrate 1 to obtain a filtrate 2 and a precipitate 1; and D) separating the precipitate 1; or alternatively, A) leaching the residue with the leaching solution to obtain a filtrate 1 and a solid cake 1; E) precipitating the Cobalt lactate, Nickel lactate or Manganese lactate from the filtrate 1 to obtain a filtrate 3 and a solid cake 2; and F) separating the solid cake 2; and G) separating the Cobalt lactate, Nickel lactate or Manganese lactate from the solid cake 2.