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Disposal of hazardous cathode ray tube waste, using a biopolymer modified concrete system

United States Patent Application

20050257719
A1
View the Complete Application at the US Patent & Trademark Office
A structural material formed of concrete-like substances which includes lead-including sand embedded within the structural material. One aspect bind the lead-containing sand using the biopolymer and/or a cross-linking agent. The biopolymers can be Xanthan gum, guar gum, and/or Chitosan. Different materials can be used for the cross-linking agent including boric acid. The materials cause the lead to be bound within a matrix within the structure, and prevent the lead from leaching out.
Kim, Daeik (Anaheim, CA), Yen, Teh Fu (Altadena, CA)
11/ 117,070
April 27, 2005
[0002] The present application received funding from the Department of Energy, national energy technology laboratory, grant number DE-AC26-01NT41307. The government may have certain rights in this invention.