Patent ID: 6270717
Filing Date: 2001-08-07
Classification: B01D,B22C

Abstract:
A filtration and distribution device for a molten metal, which is in the form of a bag having parts made of a solid heat-resistant fabric and open areas made of an open weave heat-resistant fabric, wherein at least some of said parts made of said solid heat-resistant fabric are replaced by rigid parts made of a moldable or thermo-formable composite consisting of an open weave heat-resistant fabric embedded into a matrix made of a heat-resistant inorganic material compatible with said open weave heat-resistant fabric and wherein the matrix is prepared from a moldable refractory composition in the form of a slurry which comprises:from 8 to 25% by weight of an aqueous phosphoric acid solution having a concentration of phosphoric acid ranging from 40 to 85% by weight, said phosphoric acid having up to 50% of its primary acidic functions neutralized by reaction with vermiculite; andfrom 75 to 92% by weight of a mixture containing wollastonite and an aqueous suspension containing from 20 to 40% by weight of colloidal silica in a weight ratio of said aqueous suspension to said wollastonite ranging from 0.5 to 1.2.