Method for producing ammonium octamolybdate composition

US6235261A · kind A · utility

Assignee

• Cyprus Amax Minerals Company · US

Inventors

• Mohamed H. Khan · Tucson, US
• James A. Cole · Winterset, US
• Timothy G. Bruhl · Wever, US
• Wendell S. Elder · Sigourney, US
• Gary A. Glasgow · Winterset, US
• Vijaykumar M. Wagh · Donnellson, US

Key dates

• Filing date: Sep 14, 1999
• Grant date: May 22, 2001
• Expiry date: Sep 14, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01G39/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An isomer of ammonium octamolybdate ("AOM") and method for producing the same. A new AOM isomer ("X-AOM") is described which is characterized by a distinctive Raman spectral profile compared with other AOM isomers including .alpha. and .beta.-AOM. To produce the novel isomer, ammonium dimolybdate ("ADM") is combined with molybdenum trioxide (MoO.sub.3) and water to yield a mixture. When mixing these materials, optimum results are achieved if at least one of the foregoing molybdenum-containing reagents is added in a gradual, non-instantaneous manner so that the selected reagent is not added to the mixture in a single large mass. This gradual delivery procedure, along with a carefully controlled prolonged heating stage (e.g. in excess of 3 hours) contributes to a maximum yield of high purity X-AOM.