Aluminum hydroxide-based building materials and method for...

C - Chemistry – Metallurgy – 04 – B

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C04B 7/32 (2006.01) C04B 28/04 (2006.01) C04B 28/06 (2006.01)

Patent

CA 1156268

ABSTRACT OF THE DISCLOSURE Two-way advantages are obtained by the invention in which valuable lightweight building materials with high mechanical strengths are obtained by the utilization of otherwise noxious and hardly-disposable sludge of gel-like aluminum hydroxide produced in large quantities in the process of the anodization treatment of aluminum shaped articles to cause a problem of environmental pollution. According to the inventive method, the aluminum hydroxide sludge is first admixed with a calciferous material which is preferably a combination of calcium oxide and a gypsum so that a reaction takes place between them to form ettringite and the thus obtained ettringite-containing mixture is blended with a fibrous reinforcing material such as a cellu- losic pulp or asbestos and, optionally, a Portland cement to form a blend which is shaped into a desired form of, for example, wall or ceiling board followed by curing and drying.

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