Metals Technology Development Company LLC

The Doe Run Resources Corporation

Timothy Roy Hymer

Massimo Giuseppe Maccagni

William Leonard Lane

David Michael Olkkonen

Jonathan Hylkjier Nielsen

Bruce David Chamberlain

Karl Friedrich Schneider

A process for recovering copper from copper sulfide minerals, the method comprising the steps of leaching copper sulfide minerals with an aqueous solution of ammonium chloride containing cupric chloride at a temperature of between about 40&#xb0; C. and about 95&#xb0; C. at atmospheric pressure, to produce a solution of cuprous/cupric chloride.

Recovery of copper from copper-containing sulfide ores

A process for recovering non-ferrous metals from a solid matrix may include: (a) leaching the solid matrix with an aqueous-based solution containing chloride ions, ammonium ions, and Cuions, having a pH of 6.5-8.5, in a presence of oxygen, at a temperature of 100&#xb0; C.-160&#xb0; C. and a pressure of 150 kPa-800 kPa, so as to obtain an extraction solution comprising leached metals and solid leaching residue; (b) separating the solid leaching residue from the extraction solution; and/or (c) subjecting the extraction solution to at least one cementation so as to recover the leached metals in elemental state. The pH may be greater than or equal to 6.5 and less than or equal to 8.5. Temperature may be greater than or equal to 100&#xb0; C. and less than or equal to 160&#xb0; C. Pressure may be greater than or equal to 150 kPa and less than or equal to 800 kPa.

Processes for recovering non-ferrous metals from solid matrices

A process for recovering non-ferrous metals from a solid matrix may include: leaching the solid matrix with an aqueous-based solution, in a presence of oxygen, to obtain an extraction solution including leached metals and solid leaching residue; separating the solid leaching residue from the extraction solution; and subjecting the extraction solution to at least one cementation to recover the leached metals in elemental state. The leaching solution may include chloride ions. The leaching solution may further include ammonium ions. A pH of the leaching solution may be greater than or equal to 6.5 and less than or equal to 8.5. A leaching temperature may be greater than or equal to 100&#xb0; C. and less than or equal to 160&#xb0; C. A leaching pressure may be greater than or equal to 150 kPa and less than or equal to 800 kPa.

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 &#x3bc;m; 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.

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Labadie, MO, United States of America

Timothy Roy Hymer