Patent ID: 8241715
Filing Date: 2012-08-14
Classification: B01D,C04B,F17C,Y02E,Y02P,Y02W,Y10T

Abstract:
1. A method for fabricating a packing structure comprising a crystalline phase containing from 55 to 97% by weight of xonotlite crystallites, from 3 to 45% by weight of tobermorite crystallites, and one or more intermediate phases based on Ca, Si, O and H and of the formula Ca x Si y O z .wH 2 O in a proportion of up to 15% by weight, wherein the method comprises the successive steps consisting of: a) calcining limestone blocks at a temperature of at least 850° C. for at least one hour, such that at least 90% by weight of the said blocks have dimensions of 1 to 15 mm, the said limestone having a purity of at least 92% by weight and an open porosity of between 0 and 25%, to obtain quicklime particles, b) mixing the said particles, in aqueous medium with silica and optionally with other compounds, to obtain a slurry, c) subjecting the said slurry to hydrothermal synthesis at a temperature of between 170 and 300° C., to obtain a ceramic mass, and d) drying the said ceramic mass at a temperature of 300 to 450° C. for a period of 40 to 200 hours.