| 摘要 |
PURPOSE:To produce metal Bi which has extremely high purity and is usable as a raw material for electronic materials by producing crude BiCl3 from crude metal Bi, subjecting the same to a hydrolysis treatment after rectification to form BiOCl and subjected the same to hydrogen reduction. CONSTITUTION:The crude metal Bi having about 99.99% purity is placed on a quartz boat and is put into a quartz tube. While gaseous chlorine is run in the quartz tube, the metal is heated to effect reaction in a 450-700 deg.C range to produce the crude BiCl3. After the crude BiCl3 is dropped into pure water to from the BiOCl by the hydrolysis reaction. The BiOCl is cleaned and dried and is put into a boat made of high-purity graphite. The BiOCl is heated to 700-900 deg.C in gaseous hydrogen flow and is thereby subjected to the hydrogen reduction. The Bi which has the extremely high purity and is usable as the raw material for various electronic materials is thus produced at a high yield of the raw material and at low cost.
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