Sodium zirconium carbonate and zirconium basic carbonate and methods of making the same
First Claim
1. A method of making a sodium zirconium carbonate free of OH groups comprising heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate free of OH groups.
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Abstract
A method of making sodium zirconium carbonate is described which involves forming a mixture of zirconium oxychloride with soda ash and then heating at a sufficient temperature and for a sufficient time to form the sodium zirconium carbonate. Subsequent washing and filtration steps can further form parts of this process. A novel sodium zirconium carbonate is further described which contains from about 2 wt % to about 5 wt % Na+; from about 44 wt % to about 50 wt % ZrO2; from about 12 wt % to about 18 wt % CO32−; and from about 32 wt % to about 35 wt % H2O.
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Citations
30 Claims
- 1. A method of making a sodium zirconium carbonate free of OH groups comprising heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate free of OH groups.
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23. A method of making sodium zirconium carbonate comprising mixing zirconium oxychloride with soda ash and agitating to form a solution mixture at ambient temperatures;
- heating said mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate, wherein said sufficient temperature is the boiling temperature of the mixture of zirconium oxychloride and soda ash;
after said heating, filtering off the sodium zirconium carbonate;
after filtering, washing any chloride or any impurities from said sodium zirconium carbonate;
titrating an alkaline slurry comprising said sodium zirconium carbonate with at least one acidic agent to obtain a pH of less than about 7.0;
after titrating, filtering off said sodium zirconium carbonate and washing said sodium zirconium carbonate; and
after washing, drying said sodium zirconium carbonate.
- heating said mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate, wherein said sufficient temperature is the boiling temperature of the mixture of zirconium oxychloride and soda ash;
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24. A sodium zirconium carbonate comprising from about 2 wt % to about 5 wt % Na+;
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from about 44 wt % to about 50 wt % ZrO2;
from about 12 wt % to about 18 wt % CO32−
; and
from about 32 wt % to about 35 wt % H2O, based on the weight of the sodium zirconium carbonate. - View Dependent Claims (25, 26)
a phosphate adsorption having a minimum capacity of from about 30 to about 35 mg/PO4-P/gm SCZ;
a minimum HCO3−
content of from about 2 to about 4 mEq HCO3−
gm SCZ;
a leachable Na+ content of from about 1.5 to about 2.0 mEq Na+/gm SCZ;
or a pH range of titrated sodium zirconium carbonate of from about 6 to about 7.
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29. A method of making a sodium zirconium carbonate comprising:
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heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate; and
titrating an alkaline slurry comprising said sodium zirconium carbonate with at least one acidic agent to obtain a pH of less than about 7.0.
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30. A method of making a sodium zirconium carbonate comprising:
heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate, wherein said heating occurs at a heating rate of from about 0.5°
F. to about 1°
F./minute until boiling temperature of said mixture.
Specification