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Technological behavior of porcelain stoneware bodies with Egyptian syenites
Author(s) -
Zanelli Chiara,
Soldati Roberto,
Conte Sonia,
Guarini Guia,
Ismail Ali I. M.,
ElMaghraby Mohammed S.,
Cazzaniga Alberto,
Dondi Michele
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13102
Subject(s) - materials science , ceramic , feldspar , sintering , metallurgy , mineral , phase (matter) , mineralogy , geology , quartz , chemistry , organic chemistry
The progressive depletion of the main feldspathic flux deposits in the World is forcing the ceramic industry to search for suitable substitutes. The aim of this study is to assess the potential of some feldspar sources in the Egyptian Eastern Desert, particularly syenites from Abu Khruq, in the manufacture of ceramic tiles. Beneficiated samples obtained by laboratory‐scale mineral processing were tested into porcelain stoneware batches (from 10% to 30% wt in replacement of feldspars) and compared with a reference body through a laboratory reproduction of the industrial processing. The technological behavior of unfired tiles does not suffer any significant alteration due to the use of syenites. On the other hand, syenite‐bearing bodies exhibit some changes in the phase composition and the chemistry of the melt, that turns richer in alkali, especially K 2 O. The consequently increased sintering rate depends mainly on the viscosity of the liquid phase formed during firing. In conclusion, syenites can be used without technological hindrances to manufacture porcelain stoneware tiles. The firing behavior of syenite‐bearing batches can be reasonably adjusted by setting key parameters (eg, the feldspar amount and the Na/K ratio), but the darker color of fired bodies requires to further lower the iron oxide.