On Experimental Study of Development Calcined Gypsum from Flue Gas Desulfurization by Microwave Technology

Abstract:

Flue gas desulfurization gypsum (FGD gypsum) was irradiated with microwave, it could be changed calcined gypsum from flue gas desulfurization (CGD). The microwave respectively irradiated five groups FGD gypsum at 100-110°C, 110-120°C, 120-130°C, 130-140°C and 140-150°C, then the fineness and setting time were respectively measured, and compressive/flexural strength were also determined after 2 hours. Experiments show that, CaSO4·0.5H2O crystal of CGD would be more quantity and bigger volume with irradiation temperature increasing. The reason was considered that there were special effect of microwave irradiation to calcium sulfate crystalsthat by scanning electron microscope, and found the Ca, S, O and other elements in cylindrical crystal by Edax. The formation mechanism of CaSO4·0.5H2O crystal by microwave irradiation is different from traditional CaSO4·0.5H2O crystal formation theories.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 780-784
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.780
• Online since: August 2013
• Authors: Zhi Man Zhao, Chun Jie Wang, Can Qion Li, Xiao Mei Zhang
• Keywords: CaSO₄·0.5H₂O Crystal, Flue Gas Desulfurization Gypsum, Microwave Technology

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