H. C. Starck, Gmbh & Co Kg

H.c. Starck Gmbh

Bayer Technology Services Gmbh

Wilfried Gutknecht

Wolfgang Mathy

Wolfgang Kummer

Armin Olbrich

Dirk Naumann

Josef Schmoll

Michael Traving

Werner Bäcker

Astrid Gorge

Thomas R Clark

Katrin Plaga

Rainer Ludwig

James Gregory Olson

Thomas Richter

Gregory James Olson

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

Method for extracting anions

Process for treating tungstate solutions to reduce molybdenum impurity

Cobalt metal agglomerates, process for producing the same and their use

Process for producing pure ammonium metallates

Process for the production of pure tungsten and/or molybdenum solutions from sources, such as alkaline decomposition solutions, which are contaminated with tantalum, niobium, titanium, aluminium, tin, arsenic, phosphorus and/or silicon, by application of a three stage purification process of pH reduction, anion exchange and membrane electrolysis.

Process for the production of pure solutions of tungsten and molybdenum

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Goslar, Germany

Wilfried Gutknecht