Title:
CHEMICALLY MODIFIED MICAS FOR REMOVAL OF CESIUM SALTS FROM AQUEOUS SOLUTION
Document Type and Number:
WIPO Patent Application WO/1999/003576
Kind Code:
A1
Abstract:
A chemically modified mica composite formed by heating a trioctahedral mica in an aqueous solution of sodium chloride having a concentration of at least 1 mole/liter at a temperature greater than 180 degrees Centigrade for at least 20 hours, thereby replacing exchangeable ions in said mica with sodium. Formation is accomplished at temperatures and pressures which are easily accessed by industrial equipment. The reagent employed is inexpensive and non-hazardous, and generates a precipitate which is readily separated from the modified mica.
Inventors:
YATES STEPHEN FREDERIC
DEFILIPPI IRENE
GAITA ROMULUS
CLEARFIELD ABRAHAM
BORTUN LYUDMILA
BORTUN ANATOLY
DEFILIPPI IRENE
GAITA ROMULUS
CLEARFIELD ABRAHAM
BORTUN LYUDMILA
BORTUN ANATOLY
Application Number:
PCT/US1998/014938
Publication Date:
January 28, 1999
Filing Date:
July 13, 1998
Export Citation:
Assignee:
ALLIED SIGNAL INC (US)
International Classes:
B01J20/12; B01J39/02; B01J39/08; B01J39/14; C01B33/42; (IPC1-7): B01J20/12; B01J39/14
Foreign References:
| US4715987A | 1987-12-29 | |||
| EP0398410A1 | 1990-11-22 | |||
| US4808318A | 1989-02-28 | |||
| EP0270314A2 | 1988-06-08 | |||
| DE3728003A1 | 1989-03-02 |
Attorney, Agent or Firm:
Buff, Ernest D. (Danzig Schere, Hyland & Perretti LLP Headquarters Plaza
One Speedwell Avenue Morristown NJ, US)
Criss, Roger H. (NJ, US)
Criss, Roger H. (NJ, US)
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Claims:
| 1. | A chemically modified mica composite formed by a process comprising the step of: heating a trioctahedral mica in an aqueous solution of sodium chloride having a concentration of at least 1 mole/liter at a temperature greater than 180 degrees Centigrade for at least 20 hours, thereby replacing exchangeable ions in said mica with sodium. |
| 2. | A chemically modified mica composite as recited by claim 1, wherein said sodium ions in said mica are partially replaced with cations chosen from the zirconyl cation or cations formed by treating watersoluble organic amines with aqueous acid. |
| 3. | A chemically modified mica composite as recited by claim 1, wherein said sodium ions in said mica are completely replaced with cations chosen from the zirconyl cation or cations formed by treating watersoluble organic amines with aqueous acid. |
| 4. | A chemically modified mica composite as recited by claim 1 wherein said trioctahedral mica is a member selected from the group consisting of biotite and phlogopite. |
| 5. | A chemically modified mica composite as recited by claim 1 wherein said aqueous solution additionally contains 0.01 to 0.1 moles/liter sodium hydroxide. |
| 6. | A chemically modified mica composite as recited by claim 1, wherein the interlayer spacing is greater than 11 Angstroms. |
| 7. | A chemically modified mica composite as recited by claim 1, wherein the average particle size of the trioctahedral mica is less than 500 microns. |
| 8. | A chemically modified mica composite as recited by claim 1, wherein the organic amines of claim 1 are primary or secondary amines containing five or fewer carbons, or primary or secondary diamines containing six or fewer carbons. |
| 9. | An ion exchange material for the removal of cesium from aqueous solutions formed by completely replacing the sodium ions in a sodiumexchanged trioctahedral mica with cations chosen from the zirconyl cation or cations formed by treating watersoluble organic amines with aqueous acid. |
| 10. | An ion exchange material as recited by claim 9, wherein said sodium ions are completely replaced with said cations. |
| 11. | An ion exchange material as recited by claim 7 in which said organic amines are primary or secondary amines containing five or fewer carbons. |
| 12. | An ion exchange material as recited by claim 7, wherein said organic amines are primary or secondary diamines containing six or fewer carbons. |