Mta Kozponti Fizikai Kutato Intezete

Magyar Tudomanyos Akademia Muszaki Fizikai Kutato Intezete

Laszlo Bartha

Karoly Nemeth

Elemer Nagy

Ruben Olah

Karoly Vadasdi

Csaba Lenart

Acidification of impure alkali or ammonium tungstate or molybdate solutions prior to electrodialysis to produce tungstic acid or molybdic acid is carried out by the addition of pure tungstic acid or molybdic acid as the salts of tungsten isopolyacids or molybdenum isopolyacids, respectively. This is less expensive than using pure HCl or H.sub.2 SO.sub.4 and prevents contamination with chloride or sulfate ions. The pure tungstic acid or molybdic acid is isolated from the product.

Process for production of pure tungstic acid or molybdic acid from

A method and an apparatus for the differential thermal analysis of materials includes heating a first sample to be investigated and a reference sample by radiation heat transfer from respective separated radiation sources, controlling both sources according to a predetermined temperature program for the samples, interposing an element that partly transmits radiation between each of the samples and their associated sources, sensing the temperature difference between the elements, controlling one of the radiation sources in response to the temperature difference to equalize the temperature of the elements and measuring the temperature difference between the samples during the temperature program.

Process and equipment for the thermal analysis of materials

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Budapest, Hungary

Laszlo Bartha