The introduction about High purity selenium

There are two main methods for Industrial production of High purity selenium : one is the oxidizing roasting of anode slime and SeO2 distillation, the process will the gaseous SeO2 roasting gas scrubber solution to capture, and then precipitated in acidic media or with lye SO2 role
selenium; another anode slime soda ash sintering in the oxidizing atmosphere, so that selenium into selenium sodium or water-soluble solution of sodium selenate, the process in the sintering conditions, selenium and selenium compounds are oxidized to soluble in water sub- sodium selenate or sodium selenate, and then from the solution by blowing isolated selenium.

High purity selenium is the purity of 99.9999% selenium. Is gray with metallic luster of hexahedral. The relative density of 4.792 ~ 4.86. High purity selenium Melting point 217 ~ 220.5 ℃. The boiling point of 684 ~~ 700 ℃. Chemical properties with ordinary selenium. Conductivity with changes in light intensity, dramatic changes, the use of ion exchange, thermal decomposition of hydrogen selenide, Preparation of sulfite cycle and other methods. Mainly used for the preparation of II - Ⅳ family compound semiconductor, photovoltaic materials, electrostatic photographic and optical instruments, etc.


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