Title:
PRODUCTION OF ZINC FLUORIDE
Document Type and Number:
Japanese Patent JP3499473
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce high purity zinc fluoride low in both of zinc oxides and metallic impurities.
SOLUTION: The high purity zinc fluoride low in impurities of transition metals and zinc oxides can be produced by using high purity zinc as a starting material, heating and agitating the high purity zinc in a high purity hydrofluoric acid solution, to which aqueous hydrogen peroxide is added, to precipitate hydrates of zinc fluoride and dehydrating/drying the hydrates. The dehydrating/ drying is preferably carried out at below 100°C in a vacuum drier with gaseous hydrogen fluoride, gaseous fluorine or mixed gas of the gaseous hydrogen fluoride and the gaseous fluorine of below 200°C.
Inventors:
Kenji Kobayashi
Application Number:
JP24112499A
Publication Date:
February 23, 2004
Filing Date:
August 27, 1999
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
C01G9/04; C03C13/04; (IPC1-7): C01G9/04
Domestic Patent References:
| JP7242418A | ||||
| JP6239604A |
Attorney, Agent or Firm:
Masaki Amemiya
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