Joseph D Lessard

US Patent:

20130340568, Dec 26, 2013

Filed:

Jun 20, 2013

Appl. No.:

13/922505

Inventors:

Lawrence F. McHugh - North Andover MA, US
Leonid N. Shekhter - Ashland MA, US
Joseph D. Lessard - Medford MA, US
Daniel G. Gribbin - Portland ME, US

Assignee:

ORCHARD MATERIAL TECHNOLOGY - North Andover MA

International Classification:

C22B 15/00

US Classification:

75 1014, 75643, 75640, 75 1062

Abstract:

Copper is produced by a looping oxidizing process wherein oxidation of copper sulfide concentrate to molten blister copper by conversion with copper oxides (and optionally oxygen from air) in a one step, molten bath operation to produce molten blister copper, iron oxide slag, and rich SOoff gas. The blister copper is treated in an anode furnace to reduce the iron content and oxidize residual sulfur, and prepare it for either electrolysis or reoxidation.

US Patent:

20140161715, Jun 12, 2014

Filed:

Jul 19, 2013

Appl. No.:

13/946649

Inventors:

- North Andover MA, US
Leonid N. Shekhter - Ashland MA, US
Joseph D. Lessard - Medford MA, US
Daniel G. Gribbin - Portland ME, US
Esra Cankaya-Yalcin - North Andover MA, US

International Classification:

C01G 45/02

US Classification:

423606

Abstract:

A looping method for production of MoO, the method including reacting molybdenite feed with a substantially stoichiometric mixture comprising MoOand oxygen in a first furnace to produce MoOand SO, removing a first portion of the MoOfrom the first furnace, transferring a second portion of the MoOfrom the first furnace to a second furnace, reoxidizing of the transferred portion of the MoOin the second furnace to MoO; and looping the MoOfrom the second furnace to the first furnace for use as an oxidizing agent.