Panhyavisy, Sangkhone
(2013)
Characterization And Potential Utilization Of
Gypsum From Lao Pdr.
Masters thesis, Universiti Sains Malaysia.
Abstract
The aim of this research work is to focus on the quality evaluation and optimization
processing of the gypsum rock formed from different geological depositional setting
as the potential resources for many downstream industrial applications. Samples from
naturally occurring gypsum deposits were sought from two different resources in
Khammouan province, and Savanakhet province, Lao PDR. These gypsum samples
were subjected to detailed laboratory investigations including raw material
characterization and gypsum manufacturing in order to evaluate and determined the
optimized calcined gypsum powder for each gypsum resources. Based from the
geological origins of these two gypsum resources, they have similar mineralogical,
chemical and physical characteristic. Both resources were found to be of class I (high
grade with 98% of CaSO4.2HO2), which is a specification for many industrial
applications such as plaster, wallboard, cement, food and pharmaceutical, and flue
gas desulphurization (FGD). However, both gypsum are not suitable for agriculture
as fertilizer and paint. This proved that the quality of the end-products and its
preparation were partly determined by the geological origin of the gypsum resources
especially the rock mineralogy. The gypsum powder produced after crushing,
grinding and calcinations at several temperatures (110 ºC, 150 ºC, 175 ºC, 200 ºC,
225 ºC & 250 ºC) were found to be in the form of CaSO4.0.5H2O (hemi anhydrate),
where some water have been removed. This result is supported from the physical,
chemical and mineralogical characterization on the calcined gypsum.
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