PRODUCTION METHOD OF TELLURIUM OF HIGH PURITY

• Main Author: ANDRONESCU DAN-VALERIAN
• Format: Patent
• Language: English
• Published: 02.11.1991
• Edition: 4
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

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...