Abstract: Foamed ceramics were prepared with purple shale and titanium-bearing blast furnace slag (BFS)as raw materials, and borax as flux agent, silicon carbide (SiC) as foaming agent. By analyzing the porosity, closed porosity, pore size distribution, apparent density, compressive strength and thermal conductivity, the effects of the composition of raw materials and borax addition on pore structure and physical properties were studied. The result indicates that as the BFS proportion increases, the pore size distribution of samples increases while the pore uniformity decreases. With the increase of borax addition, the compressive strength increases and the thermal conductivity decreases. The optimized proportion (mass fraction) of raw materials is 70% shale and 30% BFS, with 4% borax and 0.2% SiC addition. The foamed ceramics exhibites apparent density of 0.374 g·cm-3, thermal conductivity of 0.121 W·m-1·K-1, compressive strength of 2.59 MPa, which meets the requirements of building exterior insulation foamed ceramics. The main crystal phases of foamed ceramics are anorthite, quartz, diopside and pseudobrookite.
Key words: shale, titanium-bearing blast furnace slag, borax, foamed ceramics, thermal conductivity, compressive strength
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