Assessment of clays from Puertollano (Spain) for their use in fine ceramic by diffuse reflectance spectroscopy

作者：Zurita Ares M C; Perez M R; Quesada Carballo L; Fernandez J M^*

来源：Applied Clay Science, 2015, 108: 135-143.

DOI：10.1016/j.clay.2015.02.010

• White clay
• Second derivative
• Kubelka-Munk function
• Diffuse reflectance spectroscopy

Four different samples of sterile waste clays resulting from the coal mining activity in Puertollano (Ciudad Real, Spain) have been assessed for their potential use in the ceramic industry. Raw and calcined samples have been characterized by atomic absorption, X-Ray diffraction, scanning electron microscopy and second derivative of the diffuse reflectance spectra. This last measurement allowed not only the detection but also the quantification of the amounts of hematite and goethite responsible for the reddish color. This method proved to be the most accurate and successful in the determination of the samples' composition. Particularly, one of the clay samples was found to be suitable for its use in the fine ceramic industry, whereas other clay samples could be utilized in the production of bricks or as reddish pigments.

• 出版日期2015-5