Replacing K‐feldspar with a siliceous solid by‐product of zeolite industry for medium‐temperature calcium matte glazes

Abstract

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