PROCEDIMENTO ED APPARECCHIO PER LA PURIFICAZIONE DEL SELENIO MEDIANTE PRECIPITAZIONE DA UNA COLATA

摘要

The present invention relates to a method and apparatus for purifying selenium or its alloys by precipitation. The method is characterized in that a smaller portion of a larger amount selenium or selenium alloy is kept at the respective transition temperature between solid and liquid phases while the remaining portion is maintained at a higher temperature for a time sufficiently long to allow a substantial concentration of foreign elements in the smaller portion.