PHYSICOCHEMICAL and mineralogical CHARACTERIZATION OF GREY CLAY resulting from the TRANSFORMATION of BROWN CLAY of safi treated WITH (HCL) and its use in ceramic


A. Er-ramly*, A. Ider

Laboratoire de procédés et de l'exploitation des ressources naturelles, l'Environnement et les matériaux, Département de Chimie

Appliquée et Environnement. L'équipe de développement, la structure et les propriétés des matériaux,

Faculté des Sciences et Techniques de Settat BP 577, Université Hassan 1er Maroc

* Corresponding author: E-mail:

Received: 10 August 2012; revised version accepted: 07 October 2012



    This study concerns the results of Physicochemical and mineralogical characterization of Grey Clay resulting from the transformation of Safi brown Clay treated with Chloridric acid (HCL 3N) and its potential for use in Ceramic technology. Several techniques were used; in particular X-ray diffraction (XRD), scanning electron microscopy coupled with EDX microanalysis (SEM-EDX), differential thermal and gravimetric analyses (DTA-TGA) and finally infrared Fourier transform (FTIR) and X-ray fluorescence (XRF).

     The first objective of this work is to put a new line of research that deals with the transformation of Safi brown Clay on Grey Clay, the use of this clay in ceramic technology. The second objective was to develop gels of oxides of high purity from these clays.  we can say that the Grey clay of Safi has the same characteristics of clays used in the ceramics industry (medium heat loss, low shrinkage, good flexural strength and good behavior in plasticity), this Grey clay Safi adding 0.48% sodium carbonate is sufficient to have a good deflocculation and the viscosity is minimum corresponds to the stability of the slip, in his introduction to a formula of slip was successful with a rate of  15 to 45%.

     The SEM-EDX, X-ray, chemical analysis and Infrared spectroscopy demonstrated and allowed us to identify the different minerals that make up the Grey clay, compared with the available data, we identified illite and kaolinite as clay minerals, other minerals present as impurities major are quartz, calcite, dolomite and feldspar. These results show the important features to justify its use in the ceramic industry.

Keywords : Clay; Ceramic; DTA; FX ; XRD; FTIR.

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