Bayer Aktiengesellschaft

H.c. Starck Gmbh

H. C. Starck, Gmbh & Co Kg

Bayer Technology Services Gmbh

Hermann C. Starck Berlin Gmbh & Co Kg

H. C. Starck Gmbh & Co

Wolfgang Kummer

Ulrich Krynitz

Juliane Meese-Marktscheffel

Viktor Stoller

Wilfried Gutknecht

Mathias Benz

Evelyn Pross

Armin Olbrich

Paul B Queneau

Ricarda Leiberich

Josef Schmoll

Michael Traving

Christoph Schild

Robert W Balliett

Daniel Gordon Duff

Lawrence F McHugh

Werner Bäcker

Thomas R Clark

Martin Schloh

John E Litz

Rong-Chien Wu

James Gregory Olson

Rainer Ludwig

Wolfgang Schweda

Harry H K Nauta

Theodor A Webwer

Theodor A Weber

The invention relates to a method of recovering molybdenum from a molybdenum bearing sulfide material. The material is contacted with a leaching solution in the presence of iron compounds and mesophilic or thermophilic iron oxidizing microorganisms and subsequently, a leaching process is performed by controlling the molar ratio of dissolved ferric iron to dissolved molybdenum. Preferably, a high amount and molar excess of dissolved iron is used. The presence of high concentrations of ferric iron in bioleach solutions allows iron-oxidizing microorganisms to grow and oxidize iron and bioleach molybdenite at dissolved Mo concentrations as high as 4.4 g/L. Organic metabolites were not required for protecting cells from Mo toxicity. Maximum dissolution rates depend on reactor configuration, with agglomerated material simulating heap leaching of almost 1% Mo/day, but up to 10.2% Mo/day in suspension/stirred reactor configurations, with rate highly dependent on temperature within the range of 25&#xb0; C. to 40&#xb0; C. The ultimate extent of Mo removal from the molybdenum bearing sulfide material is 89%. Finally, molybdenum is recovered from a leach residue of the leaching process.

Recovery of molybdenum from molybdenum bearing sulfide materials by bioleaching in the presence of iron

The present invention relates to calix[4]arenes which effectively bind alkali metal ions (Na, K) and transport them over phase boundaries, their preparation and use.

Particular calixarenes method for production and use thereof

The invention relates to a method for producing lithium-transition metal mixtures of general formula Li(MM)O, wherein Mrepresents nickel, cobalt or manganese, Mrepresents chromium, cobalt, iron, manganese, molybdenum or aluminium, and is different from M, n is 2 if Mrepresents manganese and is 1 otherwise, x is comprised between 0.9 and 1.2, y is comprised between 0.5 and 1.0 and z is comprised between 1.9 and 2.1. According to the inventive method, an intimate mixture composed of transition metal compounds containing oxygen and of a lithium compound containing oxygen is calcinated, said mixture being obtained by processing a solid powder transition metal compound with a solution of said lithium compound, and then drying. At least the Mcompound is used in powder form having a specific surface of at least 20 m/g (BET) and calcination is carried out in a fluidised bed.

Method for producing lithium-transition metal mixtures

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

The invention relates to a method for producing lithium transition metalates of the general formula (I): Li (M M ) O , where M represents lithium, cobalt or manganese; M represents cobalt, iron, manganese or aluminium and is not equal to M ; n is equal to 2 if M1&equals;M, and 1 in all other cases; x is a number between 0.9 and 1.2; y is a number between 0.5 and 1.0; and z is a number between 1.9 and 2.1. According to the method, an intimate solid mixture is produced of oxygen-containing compounds of the transition metals and oxygen-containing lithium compounds and this mixture calcinated in a reactor, whereby calcination takes place at least partly at an absolute pressure of less than 0.5 bar.

Method for producing lithium transition metallates

Method for the decomposition and recovery of metallic constituents from

A molybdenum metal powder having an outer shell coating of MoO.sub.2 is useful in flame spray or plasma spray processes and is prepared by partially oxidizing molybdenum powder in a carbon dioxide atmosphere at temperatures of up to 1200.degree. C.

Oxygen-containing molybdenum metal powder and processes for its

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Goslar, Germany

Wolfgang Kummer