Study of Processing Techniques for Nepheline Syenitic Raw Material Exploitation

Abstract:

Lavrinhas, a city located 234 km northeast of São Paulo, Brazil, presents syenitic rocks with high content of nepheline, whose preliminary field assessment indicated its potential to be used in the production of ceramic products. The paper aimed to study this raw material with fluxing properties and to determine the best processing methods based on mineralogy and texture, in order to achieve better removal efficiency of the nepheline. Petrographic characterization was carried out in two rock samples, as well as the particle size characterization of the untreated material, the split into fractions for magnetic separation tests and optical microscope observation of the products. In addition, chemical and particle size analysis and melting tests were performed. The latter concerned the material melting color evaluation before and after the magnetic separation, as well as its potential use in glazes and engobes, compared to a standard sample of Nepheline, and inferences for the use in porcelain masses. Preliminary tests showed that after the removal of residual iron oxide, the nepheline raw material bearer has potential to be used in the formulation of porcelain masses, replacing other fluxing materials with higher benefit.

• Periodical: Advances in Science and Technology (Volume 92)
• Pages: 215-220
• DOI: https://doi.org/10.4028/www.scientific.net/AST.92.215
• Online since: October 2014
• Authors: Carolina del Roveri, Letícia H. Godoy, Antenor Zanardo, Luciano L. Silva, Maria Margarita T. Moreno, Fabiano C. Navarro, Sylma C. Maestrelli
• Keywords: Iron, Nepheline, Petrographic Characterization, Syenitic Rocks

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