Recycling of marble waste for desulfurization of flue gas accompanied by synthesis of gypsum and PoP

Kumar, L.; Dhakad, Vinod Kumar; Jana, Susanta Kumar

doi:10.1016/j.cherd.2022.06.022

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…The main component of the original gypsum was calcium sulfate. It can be seen from the SEM scanning images that calcium sulfate crystals mainly existed in the gypsum in the shape of needles [34], which made the gypsum full of various crevices, and heavy metals were easily leachable in the environment with water. The solidified gypsum flocculation precipitated the gypsum, filled the crevices and made it difficult to leach heavy metals.…”

Section: Principal Component Analysismentioning

confidence: 99%

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

Wang,

Wei,

Zhao

et al. 2024

Energies

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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.

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Section: Principal Component Analysismentioning

confidence: 99%

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

Wang,

Wei,

Zhao

et al. 2024

Energies

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“…Utilization of this waste for the manufacture of a few construction materials consumes only a very small fraction of the total waste generated (Sivrikaya et al 2020;Alnunu and Nalbantoglu 2022;Belkadi et al 2022). Some additional ways of its recycling may be thought of based on the utilization of its Ca-content as a substitute of limestone (Kumar et al 2020(Kumar et al , 2022Dhakad et al 2023). MARWAS constitutes a comparable amount of calcium to that in limestone.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of PCC from marble waste for its application in papermaking

Dhakad

Shrivastava

Agarwal³

2023

Preprint

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CaCl2 solution and Ca(OH)2 slurry, both prepared from marble waste (MARWAS), were carbonated with CO2 gas in the presence of CTAB, SDS, Teepol-610s, Triton-X, and Tween-80 as the surface modifiers in a semi-batch foam-bed reactor (FBR) to synthesize ultrafine or submicron PCC particles with enhanced hydrophobicity. Nano/ultrafine PPC particles with and without surfactant were also synthesized in a semi-batch stirrer reactor (SR) using CaCl2 solutions made from MARWAS and NH4HCO3 as the carbonating agent by single or simultaneous application of ultrasonication (US) and surfactant, respectively. The products were characterized by SEM, TEM, XRD, FTIR, and drop shape analyzer. In the presence of SDS in the FBR, distinct and smaller hydrophobic (water contact angle of 103.3o) vaterite particles (426 nm) could be produced using CaCl2 solution than those with the Ca(OH)2 slurry. However, in the SR, methanol was found to be more effective than the aqueous solvent in synthesizing needle-like aragonite nanoparticles (215.6 nm with L/D = 8.55) from CaCl2 solution without any use of US or surfactant. Handmade papers were manufactured using ground MARWAS powder, modified and unmodified PCC. The physical, mechanical, and optical properties of these filler-loaded papers were determined. The use of surface-modified and unmodified PCC was superior to the commercial PCC in increasing filler retention, burst strength, tear strength, brightness, and opacity of the paper hand sheets. Even the direct use of MARWAS powder was found to be more effective than GCC in enhancing the optical properties, although a slight decrease in the mechanical strength was observed.

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“…The incessant growth of the sulphur dioxide emission rate, keeping pace with the increased population and industrialization, is a serious global concern. [ 1 ] Lignite‐ and other high‐sulphur‐coal‐based power plants, processing units of old tires, and other sources are the major sources of its emissions. Over the last three decades, a large number of studies on the desulphurization of flue gas using sorbents of diverse nature and equipment types have been reported and extensively employed in industries as well.…”

Section: Introductionmentioning

confidence: 99%

Regenerative low‐cost ionic liquids: Synthesis, characterization, and application in desulphurization of flue gases

2022

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Three ionic liquids (ILs) containing the same cation but different anions were synthesized and used to separate SO2 from its mixture with air in a semi‐batch bubble column absorber. Desulphurization efficiency was determined using a state‐of‐the‐art experimental set‐up relevant to chemical process industries concerning the important process variables. The virgin and exhausted ILs were characterized using TGA, FTIR, and 1H NMR analyses. The concentrations of SO2 at the inlet to and exit from the absorber were measured using a ZRJFAY36, Fuji, Japan infrared SO2 analyzer. A maximum of 92 percent removal efficiency (PRE) was achieved from a feed gas containing 250–1500 ppm SO2 with the use of 2‐hydroxyethyl ammonium lactate [MEA][L] or tri (2‐hydroxyethyl) ammonium lactate ([TEA][L]), as the absorbents. This could be further enhanced by the interactive effect of the simultaneous increase in the superficial velocity of the gas and the volume of IL fed into the absorber. However, PRE was about 20% less with tri (2‐hydroxyethyl) ammonium salicylate ([TEA][S]). It was observed that the ILs, [MEA][L] and [TEA][L], were fairly suitable for flue gas desulphurization in industrial situations. A design criterion for continuous operation using two semi‐batch absorbers has been proposed.

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Recycling of marble waste for desulfurization of flue gas accompanied by synthesis of gypsum and PoP

Cited by 8 publications

References 26 publications

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

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

Synthesis and characterization of PCC from marble waste for its application in papermaking

Regenerative low‐cost ionic liquids: Synthesis, characterization, and application in desulphurization of flue gases

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