PRODUCTION METHOD OF TELLURIUM OF HIGH PURITY

The process comprises homogenisation of industrial tellurium, treatment with 50-70% concn. nitric acid, reprecipitation, filtration, and heating to 50-80 deg.C. This is followed by stagewise addn. of hydrazide hydrate solution. Heating at 50-80 deg. for 2-4 hours, filtration, washing, drying at 80-1...

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Bibliographic Details
Main Author ANDRONESCU DAN-VALERIAN
Format Patent
LanguageEnglish
Published 02.11.1991
Edition4
Subjects
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Summary:The process comprises homogenisation of industrial tellurium, treatment with 50-70% concn. nitric acid, reprecipitation, filtration, and heating to 50-80 deg.C. This is followed by stagewise addn. of hydrazide hydrate solution. Heating at 50-80 deg. for 2-4 hours, filtration, washing, drying at 80-110 deg.C fusion and pouring into ingot moulds under reducing or inert atmosphere, completes the process.
Bibliography:Application Number: RO19890139089