초록 ▼

An open-cell glass crystalline porous material made from hollow microspheres which are cenospheres obtained from fly ash, having an open-cell porosity of up to 90 vol. % is produced. The cenospheres are separated into fractions based on one or more of grain size, density, magnetic or non-magnetic, a

An open-cell glass crystalline porous material made from hollow microspheres which are cenospheres obtained from fly ash, having an open-cell porosity of up to 90 vol. % is produced. The cenospheres are separated into fractions based on one or more of grain size, density, magnetic or non-magnetic, and perforated or non-perforated. Selected fractions are molded and agglomerated by sintering with a binder at a temperature below the softening temperature, or without a binder at a temperature about, or above, the softening temperature but below the temperature of liquidity. The porous material produced has an apparent density of 0.3-0.6 g/cm3, a compressive strength in the range of 1.2-3.5 MPa, and two types of openings: through-flow wall pores in the cenospheres of 0.1-30 micrometers, and interglobular voids between the cenospheres of 20-100 micrometers. The porous material of the invention has properties useful as porous matrices for immobilization of liquid radioactive waste, heat-resistant traps and filters, supports for catalysts, adsorbents and ion-exchangers.

대표청구항 ▼

1. A method of making an open-cell glass crystalline porous material containing cenospheres obtained from fly ash, said porous material having an open-cell porosity of about 40 vol. % up to about 90 vol. %, said method comprising separating said cenospheres, molding a selected fraction of said separ

1. A method of making an open-cell glass crystalline porous material containing cenospheres obtained from fly ash, said porous material having an open-cell porosity of about 40 vol. % up to about 90 vol. %, said method comprising separating said cenospheres, molding a selected fraction of said separated cenospheres, and agglomerating said cenospheres under sintering conditions, said sintering conditions including isothermal holding of said cenospheres in an air atmosphere at a temperature above 800.degree. C. but below the temperature of liquidity of said cenospheres.