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·As a recycled material flue gas desulfurization gypsum has been used to prepare calcium sulfate hemihydrate whisker CSHW through hydrothermal synthesis for several decades
·of gypsum are accomplished in a single reaction vessel The contact is achieved by injecting flue gas through gas sparger tubes immersed below the surface of the limestone
·The obvious changes in the XRD patterns from Fig 2 a to Fig 2 b confirmed the complete transformation from dihydrate gypsum CaSO 4 ⋅2H 2 O to hemihydrate gypsum CaSO 4 ⋅ 2 O Because the setting time of hemihydrate gypsum is very short the citric acid with analytical pure was used as retarder in the experiment
·as a solid waste [2 ] Gypsum CaSO 4 ·2H 2 O and amorphous ferric hydroxide Fe OH 3 are major components of the red gypsum [3] Roughly 5 6 tons of red gypsum is generated for every ton of TiO 2 using the sulfate method Annually 15 million tons of RG is generated in China [4 ] In general RG is treated by outdoor stacking which
·In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement fluorogypsum FG and flue gas desulfurization FGD gypsum were comparatively investigated Moreover the action mechanisms of FG and FGD gypsum on the properties of alkali slag cement were analyzed The results show that both the FG and
·The elemental content of FGD gypsum before and after desulfurization by a saturated steam spray is shown in Figure 7 Given that FGD gypsum is largely influenced by high temperatures and atomized droplets in the dechlorination process the decomposition of chlorides and the migration and specific gravity of chloride ions were reduced 92 93
·Calcium sulfate hemihydrate whiskers CSHW a multi functional and high value added building material were prepared with flue gas desulfurization FGD gypsum by hydrothermal method which could be a reasonable disposal of FGD gypsum In order to obtain CSHW of a high aspect ratio a series of manufacturing parameters such as reaction
·Climate change is urgently calling for rapid methods to capture atmospheric carbon dioxide CO2 CO2 can be sequestred into gypsum from gas desulfurization by carbonation to produce calcium carbonate CaCO3 However CaCO3 is produced as a mixture of polymorphs including calcite and vaterite polymorphs which limits applications Therefore
·Effects of continuous application flue gas desulfurization gypsum and brackish ice on soil chemical properties and maize growth in a saline soil in coastal area of China Soil pH in all treatments tended to increase as time increased in the 0 20 and 20 40 cm soil layers in the raised bed The results of the present study suggest that
·Three significant industrial gypsum by products are flue gas desulfurization gypsum FGDG [13] which is produced from coal combustion after the wet desulfurization of flue gas; phosphogypsum PG
·As a byproduct generated during wet flue gas desulfurization FGD gypsum is primarily composed of calcium sulfate dehydrate C S ¯ H 2 which is the same as natural gypsum With the rapid development of industries FGD gypsum has become one of the bulk industrial solid wastes and triggers many local environmental problems in China Wang et
·The extensive accumulation of phosphorus slag PS not only occupies land but also pollutes the environment In the present study calcium carbide slag CS and desulfurization gypsum DG were used to synergistically activate PS and metakaolin MK was added to provide additional Al 2 O 3 for the cementitious system The setting time pH development
America is blessed with abundant low cost natural gypsum There is also an abundance of flue gas desulfurization gypsum produced as a by product of coal fired power plants As a result the market for the phosphogypsum generated by the chemical processing of phosphate rock has traditionally been limited
·The effective and safe use of FGD gypsum in agricultural land is still debated in some countries even though its effectiveness in soil management has been reported in many studies Thus the changes in the levels of soil salinity alkalinity crop yield and other physicochemical properties in different soil types and crops after reclamation and planting with
At the same time desulfurization gypsum has a significant effect on prolonging the hydration cycle of BSAC Although the early hydration speed is slow the strength is low and the resistivity is low the compactness of the late hydration is improved so that the resistivity is much higher than that of the sample without or with less
·However desulfurization gypsum has some own features as relatively finer solid size 60 μm high water content 10 15% and impurity these have special effect on the utilization The desulfurization gypsum are widely utilized in cement retarder building material embedment and neutralizer or regulator of soil in agriculture [3 4]
Forced oxidation flue gas desulfurization FGD scbbers can produce significant quantities of waste gypsum which if not utilized require safe and economical disposal Gypsum is also a waste product of the phosphate fertilizer industry which has successfully utilized stacking methods of waste disposal for more than 20 years
·Flue gas desulfurization FGD gypsum a byproduct of gas desulfurization from coal fired power plants mainly consists of CaSO 4 ·2H 2 O Wang and Yang 2018 FGD gypsum provides a source of Ca 2 with divalent Ca 2 ions being more strongly adsorbed to soil colloids than monovalent Na ions which the leaching of Na Charaibeh et al 2011
·The extensive accumulation of phosphorus slag PS not only occupies land but also pollutes the environment In the present study calcium carbide slag CS and desulfurization gypsum DG were used to synergistically activate PS and metakaolin MK was added to provide additional Al 2 O 3 for the cementitious setting time pH development
Flue gas desulfurization gypsum FGD gypsum which is mainly composed of CaSO 4$2H 2O DH is the industrial waste residue produced by the limestone gypsum wet process of ue gas desulfurization technology The bulk deposition of FGD gypsum not only takes up plenty space but also results in land and water pollution
·Flue gas desulfurization gypsum FGDG a solid waste produced during sulfur removal in coal fired power plants has applications in saline alkali soil amelioration due to its function of calcium‑sodium ion exchange Existing research has focused on the use of gypsum to improve saline alkali soils in non coastal areas However coastal areas are not only
·The synthesis of α calcium sulfate hemihydrate α CSH from flue gas desulfurization FGD gypsum is a good way to realize the comprehensive utilization of FGD gypsum To obtain α CSH with the satisfactory performances a facile hydrothermal aging pretreatment process for FGD gypsum raw materials was proposed where FGD gypsum was
·Fly ash slag based alkali activated materials have excellent mechanical performance and a low carbon footprint and they have emerged as a promising alternative to Portland cement Therefore replacing traditional Portland cement with slag desulfurization gypsum based alkali activated materials will help to make better use of the waste protect the
