The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 2004
Filed:
May. 09, 2001
Robert W. Balliett, Westborough, MA (US);
Wolfgang Kummer, Goslar, DE;
John E. Litz, Golden, CO (US);
Lawrence F. McHugh, Wellesley, MA (US);
Harry H. K. Nauta, TG Brielle, NL;
Paul B. Queneau, Golden, CO (US);
Rong-Chien Wu, Chelmsford, MA (US);
H. C. Starck, Inc., Newton, MA (US);
Abstract
High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete oxidation of the sulfide minerals while optimizing the process chemistry and autoclave conditions to solubilize as little of the molybdenum values as possible. The autoclave discharge is then subjected to a leaching step, either an alkaline leach or ammonium leach process, before or after a liquid/solid separation step . The solution is then subjected to (a) filtration , solvent extraction , crystallization , and calcination or (b) filtration , crystallization , and calcination to produce a product suitable for chemical-grade molybdenum oxide