Thaumasite formation in stabilized coal combustion by-products |
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| Affiliation: | 1. Polymeric & Soft Materials Section, CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110 012, India;2. Academy of Scientific and Innovation Research (AcSIR), CSIR-National Physical Laboratory, Dr. K. S. Krishnan Road, New Delhi 110 012, India;1. Department of Biotechnology, Noida Institute of Technology, Greater Noida, 201 306, Uttar Pradesh, India;2. Department of Chemical Engineering, Ujjain Engineering College, Ujjain, 456 010, Madhya Pradesh, India;1. Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science & Engineering, Shandong University, Jinan 250100, PR China;2. Key Laboratory of Colloid & Interface Science of Education Ministry, Shandong University, Jinan 250100, PR China;1. School of Civil Engineering and Architecture, East China Jiao Tong University, Nanchang 330013, China;2. Jiangxi Irrigation and Drainage Development Center, Nanchang 330013, China |
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| Abstract: | The by-products of the desulfurization process in a spray drier usually contain a mixture of hannebachite (CaSO3·1/2H2O), gypsum (CaSO4·2H2O), and the finer fraction of the fly ash. This material was mixed with an additional fly ash and stabilized by adding about 3 wt% lime kiln dust (LKD). The stabilized product was used either as a structural fill or was left in the storage yard for several years. Samples extracted from these sites were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The analytical results show the formation of thaumasite (Ca3Si(OH)6(CO3)(SO4)·12H2O), ettringite (Ca6Al2(SO4)3(OH)12·26H2O), and an intermediate phase with varying chemical composition of calcium, aluminum, silicon, and sulfur. |
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