Fluorinated phyllosilicate and method

Details Fluorinated phyllosilicate and method Fluorinated phyllosilicate and method

1987-12-22

1989-06-06

Dixon, Jr., William R.

Compositions

Exfoliated or intumesced

2523152, 2523155, 423118, 423328, 423329, 423462, C04B 2006

Patent

active

048369543

ABSTRACT:
There is disclosed a fluorinated phyllosilicate material and method of producing such material. The material has fluoride ions chemically bonded to a natural phyllosilicate in part at least by exchange with hydroxyl ions. The method comprises exposing a phyllosilicate to a source of fluoride ions, either gaseous, aqueous fluoride solution, or a volatile solid, and chemically bonding flouride ions to the phyllosilicate structure. The fluorinated material may be heated to a temperature in the range of 100.degree.-1000.degree. C., preferably 300.degree.-800.degree. C. to dehydrate the material. Heating at 800.degree. C. may create new crystal phases, such as sellaite (MgF.sub.2) or fluorite (CaF.sub.2).

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