System and method for the recovery of metal values from slags, drosses, and other metal-bearing materials
AssigneeMetals Technology Development Company LLC
InventorsTimothy Roy Hymer, Bruce David Chamberlain, Karl Friedrich Schneider, Massimo Giuseppe Maccagni
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Abstract
A method of recovering metal values from metal-bearing materials such as slags and drosses includes the steps of pulverizing the material to particles less than about 100 μm; leaching the pulverized material with a solution of ammonium chloride, sodium chloride, and potassium chloride; sequentially recovering at least two metals from the leachate by the addition of zinc using a sequential cementation process; and recovering zinc from the solution by electrowinning.
Claims20
A method of recovering metal values from metal-bearing materials including slags or drosses, comprising:
- pulverizing the material to particles less than about 100 μm;
- leaching the pulverized material with a solution of ammonium chloride and at least one alkali or alkali earth chloride, while maintaining the pH of the leaching solution less than about 3;
- sequentially recovering at least two metals from the leachate by the addition of zinc using a sequential cementation process;
- and
- recovering zinc from the solution by electrowinning.
A method of recovering metal values from metal-bearing materials including slags and drosses, comprising:
- pulverizing the material to particles less than about 100 μm;
- leaching the pulverized material with a solution of ammonium chloride, sodium chloride, and potassium chloride at a pH of less than about 3 and a temperature of between about 70° C. and the boiling point of the about 100° C. and at atmospheric pressure;
- sequentially recovering at least two metals from the leachate by the addition of zinc using a sequential cementation process;
- and
- recovering zinc from the solution by electrowinning.
Dependencies are inferred from the claim text.