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

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...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2020-05, Vol.17 (3), p.1167-1176
Main Authors: Lu, Xilong, Cheng, Kemu, Cao, Chun‐e, Chen, Yunxia, Shi, Wei, Wang, Peng
Format: Article
Language:English
Subjects:
Calcium
calcium matte glazes
Chemical composition
Differential thermal analysis
Glazes
Incident light
Raman spectroscopy
solid wastes
Substitutes
Thermodynamic properties
Wollastonite
Zeolites
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Summary: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 well‐resolved Raman peaks of the calcium matte glazes. In the matte glaze layer, the length of the columnar wollastonite particles is oriented horizontally with the b‐axis normal to the incident laser beam of Raman spectrometer (the left) resulting in a well‐resolved Raman spectrum. In contrast, pure wollastonite without any specific orientation or parallel to the laser beam (the right) lead to poorly‐resolved Raman bands.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13424