The Investigation of Phase Transformation Process of Nano-Citrogypsum via Recycling Saline Solution

Abstract:

Because citric acid may be used to preserve food, the citric acid business has grown to play a significant role in the food and beverage sector. Environmental problems with gypsum waste, or citrogypsym, resulted from the manufacture of citric acid. Calcium sulfate dihydrate (DH), with low material physical characteristics, is the primary component of gypsum. As a result, the goal of this research is to examine the phase transformation process of citrogypsum using the hydrothermal process, which is a method of recrystallizing an example solution in an appropriate setting. To do this, a recycling calcium chloride solution was used, and it was heated to 95°C for five hours under atmospheric pressure to form alpha calcium sulfate hemihydrate (α-HH). The present of -OH at 1600 cm-1 wave numbers in the FT-IR spectra of α-HH, indicates that CaSO₄ has 0.5 water molecules in its crystal. Moreover, the DSC thermograms of α-HH reveal endothermic peaks at 151.2°C and 183.14°C, respectively, which correspond to the loss of 0.5 water molecules in CaSO₄. The TGA thermogram of α-HH also shows a crystal water content of 4.5 wt%. Furthermore, SEM images validate the hexagonal structure of α-HH morphology. In addition, because chloride ions have an impact on corrosive materials, the saline solution can be recycled at least four times to save money and the environment.

• Periodical: Solid State Phenomena (Volume 364)
• Pages: 31-36
• DOI: https://doi.org/10.4028/p-U2iStS
• Online since: September 2024
• Authors: Samitthichai Seeyangnok, Navin Boonsuwan, Thanakit Sirimahasal, Siriporn Pranee, Nisalak Trongsiriwat*
• Keywords: Calcium Sulfate Dihydrate, Calcium Sulfate Hemihydrate, Citrogypsum

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