Patent ID: 7438756
Filing Date: 2008-10-21
Classification: C01F,C04B,Y02W,Y10S

Abstract:
1. A method of improving a material comprising a pozzolanic kaolin component, and at least 2% by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide and calcium carbonate, and the material is treated with an aqueous liquid with a pH=x, with x being <12.5, resulting in treated, calcium-depleted material that, as a result of the treatment, contains modified-kaolin of improved pozzolanity and a calcium-enriched aqueous solution; characterized in that the treatment is continued until the pH of the calcium-enriched aqueous solution is at least x+0.2; and the treated calcium-depleted modified-kaolin containing material and the calcium-enriched aqueous solution are separated.