Resource Recovery from Flue Gas Desulfurization Systems

Goodwin, Richard W.

doi:10.1080/00022470.1982.10465500

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…This by-product has almost the same composition as natural gypsum [ 3 , 4 , 5 ]. Resource recovery of the FGD process has been emphasized for many years, especially for FGD gypsum [ 6 ]. FGD gypsum has been made into prefabricated building elements such as bricks, blocks, and wallboards [ 7 ], but some mercury is likely to be embedded in FGD gypsum due to the wet FGD scrubber [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

2020

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One new flue gas desulfurization (FGD) gypsum-based binder is attempted in this article, which is made up of FGD gypsum, ground granulated blast furnace slag (GGBS) and ordinary Portland cement (OPC). Influences of raw materials, chemical activators, and curing conditions on the compressive strength of this new binder-based mortar, as well as its durability performances and microscopic characteristics, are investigated in consideration of utilizing FGD gypsum as much as possible. Results show that the compressive strength of this new binder-based mortar under normal curing conditions could increase along with GGBS dosages from three days to 90 days. The compressive strength of one selected mix proportion (FG-4550), which contains the highest dosage of FGD gypsum (45 wt.%), is much the same as those containing the highest dosage of GGBS. A better compressive strength of FG-4550 under normal curing conditions could be gained if the fineness of GGBS is improved. The activated effect of CaCl2 on the compressive strength of FG-4550 is superior to that of Ca(OH)2 under steam curing conditions. FG-4550 shows a good capacity for resistance to water, a low shrinkage ratio, but poor compressive strength after 30 freeze-thaw cycles. Based on the mineralogy of X-ray diffraction, the morphology of scanning electron microscopy and the pore diameter distributions of 1H nuclear magnetic resonance, the compressive strength of this FGD gypsum-based mortar mainly depends on clusters of ettringite.

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Section: Introductionmentioning

confidence: 99%

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

2020

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By‐product gypsum from the tapioca starch process

Beretka

1992

J of Chemical Tech & Biotech

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By‐product gypsum derived from the tapioca starch process was calcined in the laboratory and evaluated for use in the manufacture of plaster of Paris and plaster products. The gypsum had a purity of about 98%, was fine (1 %, + 150μm) and had a low bulk density (600 kg/m3). The laboratory calcined material had a higher than normal water requirement of 120–130 ml/100 g, and a long setting time of 65 min. Specimens cast at a water/solids ratio of 1·0 had a low compressive strength of 2·4–3·4 MPa. However, the mechanical strength could be improved by the addition of water‐reducing admixtures, and a strength of 7·6 MPa was obtained at a water/solids ratio of 0·6 and a resulting density of 1190 kg/m3. The waste gypsum derived from the manufacture of tapioca starch appears to be suitable for the manufacture of plaster of Paris and plaster products after the incorporation of water‐reducing admixtures into the plaster slurry.

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Goodwin¹

2014

Combustion Ash Residue Management

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Resource Recovery from Flue Gas Desulfurization Systems

Cited by 3 publications

References 2 publications

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

By‐product gypsum from the tapioca starch process

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