A novel green porous ceramics fabricated simply by utilizing both manganese slag and silicate tailings as raw materials at low temperature

Abstract

A porous wollastonite ceramic with high porosity and low density has been successfully fabricated at low temperature with silicate tailings and electrolytic manganese slag (MS) as primary raw materials in this study. The influences of calcination temperature, SiC, and MS addition amounts on porosity, water adsorption, pore size distribution, bulk density, and bending strength were systematically studied. The results showed that 0.4 wt% of SiC was optimal for the ceramic foaming at a sintering temperature of 1140 °C. The porosity of ceramics reduced from 78.4% to 63.7%, bulk density elevated from 0.96 to 1.13 g/cm³, and bending strength increased from 8.43 to 11.22 MPa as the MS increased from 8.33 wt% to 41.67 wt%. Moreover, the best corrosion resistance performance reached to 99.55% with 8.33 wt% MS content and a sintering temperature of 1160 °C. This work is of significance for the solid waste utilization.

Keywords

low temperature / manganese slag / porous ceramics / silicate tailings

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Central South University