| 摘要 |
PURPOSE:To obtain high-grade rhenium in high efficiency by reducing potassium perrhenate in three stages at prescribed temp. and by subjecting the above to dehydration treatment and drying under prescribe conditions. CONSTITUTION:The potassium perrhenate is subjected to the first reduction at 250-350 deg.C, to the second reduction at 650-750 deg.C, and finally to the third reduction at >=950 deg.C. The resulting reduced substance is washed with water until pH of 6.8-7.5 is reached. The above is dehydrated and then dried at <=200 deg.C.
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