Solidification and Release Characteristics of Heavy Metals in Gypsum from Coal-Fired Power Plants

Dongxu Wang, Shuzhou Wei, Dawei Zhao, Yongzheng Gu and Jiawei Wang ()
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Dongxu Wang: CHN Sanhe Power Generation Co., Ltd., Langfang 065201, China
Shuzhou Wei: CHN Sanhe Power Generation Co., Ltd., Langfang 065201, China
Dawei Zhao: CHN Sanhe Power Generation Co., Ltd., Langfang 065201, China
Yongzheng Gu: National Energy Research and Development Center of Carbon Capture, Utilization and Storage (CCUS) Technology for Coal-Based Energy, Beijing 100101, China
Jiawei Wang: Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, North China Electric Power University, Beijing 102206, China

Energies, 2024, vol. 17, issue 9, 1-14

Abstract: Heavy metals in flue gas desulfurization (FGD) gypsum from coal-fired power plants are at risk of releaching during the processes of stockpiling and resource utilization. In this study, the effects of organosulfur chelators dithiocarbamate (DTC) and trisodium trithiocyanate-15 (TMT-15) on the solidification characteristics of heavy metals in desulphurized gypsum under different mass fractions, pH values, water contents and reaction times were investigated. The chemical composition and morphology were analyzed by inductively coupled plasma atomic emission spectrometer (ICP-AES) and scanning electron microscope (SEM). The experiments showed that both DTC and TMT-15 were effective at stabilizing the heavy metals in the FGD gypsum, with more than a 50% curing effect for all the heavy metals except Pb. DTC showed a better stabilization for Pb, Hg, Cu, Zn, and Cr, and TMT-15 showed a better curing effect for Cd. The solidified gypsum had good heavy metal stability in low-water-content environments. Increasing the mass fraction, reaction time, and pH decreased the heavy metal leaching, and the mass fraction had the greatest effect on the total heavy metal leaching concentration, followed by the reaction time and pH value.

Keywords: coal-fired power plants; desulfurization gypsum; heavy metals; chelating agent; solidification (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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