To recycle a multicomponent siliceous solid waste (MSW), a by-product of the zeolite industry, as a K-feldspar substitute for the preparation of medium temperature calcium matte glazes, the chemical composition, phase evolution, and thermal behavior of the waste versus temperature were characterized using multiple techniques.Based on the TG-DTA results, the waste was thermal treated at an optimum temperature of 1200°C prior to glaze preparation. Then, the calcined MSW was substituted for various amounts of K-feldspar and calcium matte glazes were prepared that produced high-quality smooth surfaces with a velvety appearance after firing at 1200°C. The results indicate that the matting effects originate from the scattering of the incident light by densely populated columnar wollastonite crystals embedded in the glazes with the b-axis parallel to the glaze layer, which facilitates the wellresolved Raman peaks of the calcium matte glazes. K E Y W O R D Scalcium matte glazes, Raman spectroscopy, solid wastes, wollastonite

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ZrOCl2•6H2O and Y(NO3)3 were used as raw materials to fabricated Y2O3 stabilized ZrO2(YSZ) nanopowders by hydrothermal method. The addition of Y2O3, different precipitants, different hydrothermal temperatures and times were studied. XRD and TEM were employed to characterize phase compositions, grain sizes and lattice parameters of the as-prepared YSZ nanopowders. The results show that less than 10nm and well crystallized cubic YSZ were obtained under a certain experimental conditions. Different precipitants affect the formation of precursors and final products. The addition of NaOH is benefit to the growth of YSZ crystals with the max grain size and the minimum lattice distortion among the three kinds of precipitants. Amorphous YSZ powders are obtained at lower hydrothermal temperature of 150°Cfor longer treating time of 6h. However, when the hydrothermal temperature is elevated at 180°C, well crystallized YSZ powders are prepared only treated for 2h.