| http://www.w3.org/ns/prov#value | - Further details regarding the use of froth flotation techniques for removing titanium-based impurities from kaolins may be found at numerous places in the prior art, including for example U.S. Pat. Nos. 3,450,257 to E. K. Cundy, 4,518,491 to B. M. Bilimoria, and U.S. Pat. No. 4,090,688 to Alan Nott.
|
