In this study, the foam ceramics based on ceramic tile polishing waste (CTPW) were successfully prepared by a simple solid phase sintering method. The CTPW was used as the main raw material, SiC inside CTPW as the foam agent and (NH 4 ) 6 Mo 7 O 24 as the sintering additive. Effects of the amounts addition of (NH 4 ) 6 Mo 7 O 24 (06 wt %) and sintering temperature (10801200°C) on the sintering properties, structural evolution, phase composition and mechanical properties have been investigated.

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... uring the sintering process, the SiC inside CTPW could react with oxygen and then produce the gases such as CO and CO 2 , which caused a closed-pore structure. After adding (NH 4 ) 6 Mo 7 O 24 and increasing the sintering temperature, a better porous structure with suitable pore size and high compressive strength could be obtained. It was found that the foam ceramics doped with 2 wt % (NH 4 ) 6 Mo 7 O 24 and sintered at 1200°C for 30 min showed excellent properties: a low bulk density (0.362 g/cm 3 ), the appropriate pore size (0.94 mm), a uniform pore size distribution and a very high compressive strength (8.16 MPa).