Multilayer High-Alumina Ceramic Materials for Disperse Systems Microfiltration with Active Layer Received in Al2O3-CuO, Al2O3-TiO2-MnO2 Systems

摘要

Designed composition of ceramic mass for synthesis of the high-alumina ceramic substrates for production multilayer microfiltration membranes. Electrocorandum (fraction 100-250 microns) was used as filler for producing of the high-alumina substrates, as a binder-kaolinite-hydromica clay and aluminoborosilicate glass and chalk. Formation of material carried by dry pressing at the pressure of 60 MPa, the temperature of synthesis was 1200-1300 °C. The effect of the sintering temperature of the material, the amount and composition of binder on the porosity, mechanical strength, permeability and porous structure of high-alumina permeable porous substrate was investigated. The structure of the substrate is represented by an extensive network of slit-shape pore channels, an average equivalent pore diameter-10-40 urn. The material has the following set of physicochemical properties: mechanical compressive strength is 27.41 MPa, open porosity-36.49 %, permeability coefficient-2.07·10~(-7) m~2. The possibility of application of permeable high-alumina porous substrates as macro-and microfiltration elements in the dairy industry was researched. Designed multilayer high-alumina ceramic materials for disperse systems microfiltration with active layer received in Al2O3-CuO, Al2O3-TiO2-MnO2 systems. The average pore diameter of the microfiltration layers is 1-10 μm, the open porosity-38.90-48.42 %, the permeability coefficient of the multilayer membranes (thickness 6.15-6.25 mm)-(1.566— 1.669)·10~(-7)m~2.