Claims
- 1. A method of producing a clear soluble silicate solution free of unreacted silica from biogenetic silica containing metal salts and organic material which could leach into and contaminate and color the soluble silicate solution comprising,
- dissolving in a closed container the biogenetic silica in an alkali solution of at least pH 12 in an amount effective to dissolve all of the biogenetic silica and at a temperature not higher than 275.degree. F. in the presence of a solid carbonaceous material thereby preventing the metal salts and organic material from leaching into and coloring the resulting soluble silicate solution,
- removing the resulting soluble silicate solution from the closed container, and separating the solid carbonaceous material, the metal salts and organic material from the resulting soluble silicate solution.
- 2. The method of claim 1 where, the dissolution of the biogenetic silica is at ambient temperature and atmospheric pressure.
- 3. The method of claim 1 where, the dissolution of the biogenetic silica is at a temperature above ambient temperature.
- 4. The method of claim 1 where, the dissolution is at a pressure above atmospheric pressure.
- 5. The method of claim 1 where, the dissolution of the biogenetic silica is at a temperature above ambient temperature and at a pressure above atmospheric pressure.
- 6. The method of claim 1 where, the solid carbonaceous material present is in an amount of at least about 1% by weight of the biogenetic silica.
- 7. The method of producing a dry soluble silicate comprising,
- drying the separated resulting soluble silicate solution of claim 1.
- 8. The method of claim 1 including,
- frothing the separated resulting soluble silicate solution to form a foam.
- 9. A method of producing a clear soluble silicate solution free of unreacted silica from rice hull ash containing polyvalent metals and organic material which could leach into and contaminate and color the soluble silicate solution comprising,
- dissolving in a closed container the rice hull ash in an alkali solution of at least pH 12 in a molar ratio of silica to alkali in the range of 1 to 2 to 2 to 1 and at a temperature not higher than 275.degree. F. in the presence of a solid carbonaceous material thereby preventing the polyvalent metals and organic material from leaching into and coloring the resulting soluble silicate solution,
- removing the resulting soluble silicate solution from the closed container, and
- separating the solid carbonaceous material, the polyvalent metals and organic material from the resulting soluble silicate solution.
- 10. The method of claim 9 where, the dissolution of the rice hull ash is at ambient temperature and atmospheric pressure.
- 11. The method of claim 9 where, the dissolution of the rice hull ash is at a temperature above ambient temperature.
- 12. The method of claim 9 where, the dissolution is at a pressure above atmospheric pressure.
- 13. The method of claim 9 where, the dissolution of the rice hull ash is at a temperature above ambient temperature and at a pressure above atmospheric pressure.
- 14. The method of claim 9 where, the solid carbonaceous material is at least about 1% by weight of the silica ash.
- 15. A method of producing a dry soluble silicate comprising,
- drying the separated resulting soluble silicate solution of claim 9.
- 16. The method of claim 15 where, frothing the resulting soluble silicate solution after separation to form a foam.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8717861 |
Jul 1987 |
GBX |
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CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of U.S. application Ser. No. 07/483,440 filed Feb. 7, 1990, now abandoned. which in turn is a continuation of application Ser. No. 07/225,107 filed Jul. 27, 1988, abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (1)
Number |
Date |
Country |
14-27314 |
Nov 1939 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Shugar et al., Chemical Technicians' Ready Reference Handbook, 2.sup.nd Ed., (McGraw-Hill, NY, 1981) pp. 294-296. |
Continuations (1)
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Number |
Date |
Country |
Parent |
225107 |
Jul 1988 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
483440 |
Feb 1990 |
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