Facile purification of locally mined gypsum and its use for preparing nano-hemihydrates

Luqman Ayodeji ADAMS; Enobong Essien; Taiwo Aiyeloro; Stella Oseyomon; John Makanjuola

doi:10.55713/jmmm.v31i3.1119

Authors

Luqman Ayodeji ADAMS Department of Chemistry, University of Lagos, Nigeria
Enobong Essien Department of Chemical and Food Sciences, Bells University of Technology, Ota, Nigeria
Taiwo Aiyeloro Department of Chemical and Food Sciences, Bells University of Technology, Ota, Nigeria
Stella Oseyomon Department of Chemistry, University of Lagos, Nigeria
John Makanjuola Department of Dentistry, College of Medicine, University of Lagos, Nigeria

DOI:

https://doi.org/10.55713/jmmm.v31i3.1119

Keywords:

Gypsum, Hemihydrate, Retrograde solubility, Microwave energy, Purification

Abstract

Gypsum has a wide range of applications, in interior decorations, building construction, supplements or implants in orthopaedics to mention a few. However, in many developing countries including Nigeria, there is still a large-scale importation despite huge available natural deposits. In this study, a facile method to purify locally-mined gypsum has been explored based on the mineral retrograde solubility in water. The purified gypsum was investigated for its elemental composition in comparison to the crude sample and a commercially obtained medical-grade gypsum using X-ray fluorescence (XRF). The results showed that the purified gypsum contained 94.05% CaSO4 compared with the crude which had a CaSO4 content of 58.10%. Hemihydrates obtained by the treatments of the purified gypsum in an oven, autoclave and microwave gave different morphologies when observed under a scanning electron microscope (SEM). Transmission electron microscopy (TEM) showed that particle sizes of all the hemihydrates were within the range 9 nm to 32 nm, but the microwave-derived sample exhibited the most desirable morphological characteristics which could impart high mechanical performance. We have reported here a new facile method for purifying gypsum ore that can have huge commercial benefits.

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