Process for forming water resistant magnesian cement...

Details Process for forming water resistant magnesian cement... Process for forming water resistant magnesian cement...

C - Chemistry, Metallurgy

04

B

C04B 9/02 (2006.01) C04B 9/04 (2006.01) C04B 9/20 (2006.01) C04B 22/16 (2006.01) C04B 28/30 (2006.01)

Patent

CA 2051414

-23- ABSTRACT OF THE DISCLOSURE A process for the formation of magnesian cement having low water solubility and long term retention of mechanical properties. The process comprises acidulating insoluble basic, hydroxy and/or fluorophosphatic mineral material to activate it prior to or after mixing the mineral material with reactive magnesium oxide source material such as calcined dolomite or calcined magnesite, source material for magnesium chloride and/or sulphate such as bitterns, magnesium chloride hexahydrate or epsomite and sufficient water to make a workable slurry, with or without other common additives. The mineral material may be in the form of low grade phosphate rock and in some cases it may be desirable to calcine the phosphate mineral material prior to acidualtion and mixing the cementitious components.

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