Process and products of chinese kaolin
View Patent ↗Disclosed are methods of processing Chinese kaolin involving providing Chinese kaolin having a desired powder size, delaminating the Chinese kaolin, pulverizing the delaminated Chinese kaolin at least two times, and heating the at least twice pulverized Chinese kaolin. Also disclosed are systems for automated processing of Chinese kaolin containing a pulverizer for pulverizing Chinese kaolin, a tester for testing and generating data of at least one parameter of the Chinese kaolin or at least one parameter of the pulverizer, a controller, operatively coupled to the pulverizer and the tester, for controlling operation of the pulverizer based on data received from the tester.
1. A method of processing Chinese kaolin, comprising
providing Chinese kaolin wherein at least about 90% by weight of the Chinese kaolin has an equivalent spherical diameter of about 75 microns or less and from about 0.01% to about 90% by weight of the Chinese kaolin has an equivalent spherical diameter of about 2 microns or less, the Chinese kaolin having a higher carbon content, a lower iron oxide content, and a higher propensity to release alumina upon heating compared to Middle Georgia (U.S.A.) kaolin;
delaminating the Chinese kaolin to provide at least about 60% by weight of Chinese kaolin having an average particle diameter of about 2 microns or less;
exposing the carbon on a surface of the delaminated Chinese kaolin by pulverizing the delaminated Chinese kaolin at least two times before heating at a temperature from about 450 to about 1200° C.; and
consuming the carbon on the surface of the at least twice pulverized Chinese kaolin by heating the at least twice pulverized Chinese kaolin at a temperature from about 450 to about 1200° C. for a time from about 1 minute to about 10 hours.
2. The method of claim 1 , wherein the delaminated Chinese kaolin is pulverized at least five times before heating at a temperature from about 450 to about 1200° C.
3. The method of claim 1 , wherein the delaminated Chinese kaolin is pulverized at least seven times before heating at a temperature from about 450 to about 1200° C.
4. The method of claim 1 , wherein delaminating the Chinese kaolin comprises forming a slurry comprising Chinese kaolin, grinding media, dispersants, and water and wet milling the slurry.
5. The method of claim 1 , wherein after pulverization and before heating at a temperature from about 450 to about 1200° C.,at least about 80% by weight of the Chinese kaolin has an equivalent spherical diameter of about 2 microns or less.
6. The method of claim 1 , further comprising pulverizing the Chinese kaolin after being heated at a temperature from about 450 to about 1200° C.
7. The method of claim 1 , having wherein at least about 90% by weight of the Chinese kaolin provided has an equivalent spherical diameter of about 60 microns or less and from about 0.1% to about 50% by weight of the Chinese kaolin provided has an equivalent spherical diameter of about 2 microns or less comprises.
8. The method of claim 1 , further comprising reducing a moisture level of the delaminated Chinese kaolin before pulverizing the delaminated Chinese kaolin.
9. The method of claim 8 , wherein reducing a moisture level of the delaminated Chinese kaolin comprises spray drying the delaminated Chinese kaolin.
10. A method of processing Chinese kaolin, comprising
providing Chinese kaolin wherein at least about 90% by weight of the Chinese kaolin has an equivalent spherical diameter of about 75 microns or less and from about 0.01% to about 90% by weight of the Chinese kaolin has an equivalent spherical diameter of about 2 microns or less, the Chinese kaolin having a higher carbon content and a higher propensity to release alumina upon heating compared to Middle Georgia (U.S.A.) kaolin;
delaminating the Chinese kaolin to provide the Chinese kaolin with a first bulk density;
exposing the carbon on a surface of the delaminated Chinese kaolin by pulverizing the delaminated Chinese kaolin at least two times before heating at a temperature from about 450 to about 1200° C., wherein exposing provides the Chinese kaolin with a second bulk density at least about 25% less than the first bulk density; and
consuming the carbon on the surface of the at least twice pulverized Chinese kaolin by heating the at least twice pulverized Chinese kaolin to form at least one of metakaolin, partially calcined kaolin, and calcined kaolin.
11. The method of claim 1 , wherein at least about 90% by weight of the at least twice pulverized Chinese kaolin has an equivalent spherical diameter of about 2 microns or less and at least about 60% by weight of the at least twice pulverized Chinese kaolin has an equivalent spherical diameter of about 1 micron or less.
12. The method of claim 1 , wherein the delaminated Chinese kaolin is pulverized at least three times before heating at a temperature from about 450 to about 1200° C.
13. The method of claim 1 , wherein the delaminated Chinese kaolin is pulverized at least nine times before heating at a temperature from about 450 to about 1200° C.
14. A method of processing Chinese kaolin, comprising
providing Chinese kaolin wherein at least about 90% by weight of the Chinese kaolin has an equivalent spherical diameter of about 75 microns or less and from about 0.01% to about 90% by weight of the Chinese kaolin has an equivalent spherical diameter of about 2 microns or less, the Chinese kaolin having a higher carbon content and a higher propensity to release alumina upon heating compared to Middle Georgia (U.S.A.) kaolin;
delaminating the Chinese kaolin to provide at least about 60% by weight of kaolin having an average particle diameter of about 2 microns or less;
exposing the carbon on a surface of the delaminated Chinese kaolin by pulverizing the delaminated Chinese kaolin at least two times before heating at a temperature from about 450 to about 1200° C.; and
consuming the carbon on the surface of the at least twice pulverized Chinese kaolin by heating the at least twice pulverized kaolin at a temperature from about 450 to about 1200° C. for a time from about 1 minute to about 10 hours.
15. The method of claim 14 , wherein the delaminated Chinese kaolin is pulverized at least five times before heating at a temperature from about 450 to about 1200° C.
16. The method of claim 14 , wherein the delaminated Chinese kaolin is pulverized at least seven times before heating at a temperature from about 450 to about 1200° C.
17. The method of claim 14 , wherein delaminating the Chinese kaolin comprises forming a slurry comprising Chinese kaolin, grinding media, dispersants, and water and wet milling the slurry.
18. The method of claim 14 , wherein after pulverization and before heating, at least about 80% by weight of the Chinese kaolin has an equivalent spherical diameter of about 2 microns or less.
19. The method of claim 14 , further comprising pulverizing the Chinese kaolin after being heated at a temperature from about 450 to about 1200° C.
20. The method of claim 1 , wherein the carbon in the Chinese kaolin is exposed on the surface of the delaminated Chinese kaolin by pulverizing the delaminated Chinese kaolin at least three times before heating at a temperature from about 450 to about 1200° C., and the heated Chinese kaolin has scattering from 0.225 to 0.245.
21. The method of claim 10 , wherein the delaminated Chinese kaolin is pulverized at least three times before heating at a temperature from about 450 to about 1200° C., and the heated Chinese kaolin has scattering from 0.225 to 0.245.