Characterization of Portuguese gypsums as raw materials for dermocosmetics

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Costa, C (Author) Other; Fortes, A (Author) Other; Rocha, F (Author) Other; Cerqueira, A (Author) Other; Santos, D (Author) Other; Maria Helena Amaral (Author) FFUP

Journal

Title: Clay Minerals

Vol. 54

Pages: 277-281

ISSN: 0009-8558

Publisher: Walter De Gruyter

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 2 Citations

Other information

Authenticus ID: P-00R-572

DOI: 10.1180/clm.2019.36

Abstract (EN): Portuguese gypsum deposits utilized by the cement industry were characterized mineralogically, chemically and technologically for possible application in dermocosmetics. The deposits studied (Loule, Obidos and Soure) correspond to small outcrops in diapiric anticline areas. In principle, they represent gypsites which are white, and generally of higher quality for traditional applications (e.g. white cement), or greyish, and generally not adequate for cements and mortars. The analytical methods used to characterize the materials were wet sieving and X-ray sedimentation, X-ray diffraction, X-ray fluorescence spectrometry and assessment of abrasiveness, plasticity, texturometrics (adhesivity and firmness), oil absorption and cooling rate. The Obidos gypsum displayed greater mineralogical and chemical quality (almost pure calcium sulfate) and had a finer grain size (<63 mu m), whereas Loule and Soure gypsums contain mineralogical impurities (mainly quartz). The Obidos gypsum shows good characteristics in general for application in dermocosmetics because of its absorption, plasticity, adhesivity, firmness and low abrasiveness.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5