H.c. Starck Gmbh

John E Litz

Paul B Queneau

Rong-Chien Wu

Robert W Balliett

Wolfgang Kummer

Lawrence F McHugh

Harry H K Nauta

The process chemistry during the oxidation of molybdenite concentrates in an oxygen pressure leach can be controlled by regulating the amount of ferric iron and excess sulfuric acid recycled as autoclave discharge slurry or filtrate to the autoclave feed. A computer model capable of predicting the concentration of soluble molybdenum in the autoclave discharge and based on the concentrate and recycle analyses was developed.

Autoclave control mechanisms for pressure oxidation of molybdenite

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

Production of pure molybdenum oxide from low grade molybdeniteconcentrates

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Golden, CO, United States of America

John E Litz