When the amount of desulfurized gypsum applied to moderate saline alkali soil and severe saline alkali soil exceeded 30 t·hm 2 the increase rate of crop yield Oil sunflower alfalfa corn rice wheat Lycium barbarum and sweet sorghum showed a decreasing trend To further analyze the effect of desulfurized gypsum on the improved saline
Other sources of gypsum include phosphogypsum citrogypsum and fluorogypsum which are byproducts of different chemical manufacturing processes1 Gypsum has many beneficial uses including agricultural applications wallboard products for residential and commercial buildings as an ingredient in portland cement manufacturing and as a filler
Analysis of chemical compositions and micro structure of dry desulfurized gypsum Table 1 shows the chemical compositions of the dry desul furized gypsum produced by H Company South Korea
·This FGDG is a great source of gypsum for several applications but a good portion of this FGDG is currently being disposed of in landfills This FGDG could be a more important source of gypsum in the future considering the use of renewable energy would increase while coal combustion would decrease Flue gas desulfurized gypsum FGD gypsum
·As a low cost and abundant source of Ca flue gas desulfurization FGD gypsum has become a common saline sodic soil ameliorant to provide Ca 2 which replaces exchangeable Na and reacts with
gypsum fly ash adhesive and found that different amounts of desulfurized gypsum and quicklime have different effects on the activation of fly ash Zhu et al [26] selected Ⅰ and Ⅱ grade fly ash as full tail filling cementing materials and lime and gypsum
·Waste gypsum industrial waste including flue gas desulfurization FGD gypsum wt% of CaO and phosphogypsum wt% of CaO can be used for direct MC conversion rate
·Calcium sulfate whiskers CSWs were synthesized using purified flue gas desulfurization FGD gypsum as raw materials using a hydrothermal method where the filtrate was recycled back to the reaction slurry The study investigated the impact of pH and Cu2 concentration in the reaction solution with or without reagent compensation The effects of
·In order to explore the effect of combining straw and desulphurized gypsum on improving coastal saline alkali soil taking the alkaline saline soil in the Yellow River Delta as the research object six treatments including the control CK desulphurized
·Gypsum deposits were formed during the Paleozoic Era approximately 600 million years ago when most of the Earth s surface was covered by salt water Gypsum is composed of % calcium sulfate and % water by weight It is a nonmetallic mineral one of the most abundant in the world and is found in rock form
·Flue gas desulphurisation gypsum FGDG mainly refers to the solid by product produced via lime gypsum desulphurisation that is performed in various industries to treat flue gas after the combustion of sulphur containing fuels such as coal and petroleum [1] In the limestone gypsum flue gas desulphurisation process tons of FGDG can be produced for every 1 ton
·Two kinds of inorganic reinforcing materials single Portland cement clinker compound Portland cement clinker and mineral powder were used to analyze the effects of desulfurized gypsum on the properties of desulfurized gypsum based cementation material The results show that either single Portland cement clinker or compound Portland cement clinker
·[21] Tobert HA and Watt DB 2014 Impact of flue gas desulfurization gypsum application on water quality in a coastal plain soil J Environ Qual 43 273 280 Google Scholar [22] Tong ZJ Li QS and Zhou YS 2009 Effects of desulfurized gypsum on heavy metal desorption and speciations in tidal flat reclaimed soil Eco and Environ Sci 18 2172 2176 in
·Ltd ; Desulfurization gypsum Huainan Thermal Power Plant The content of hemihydrate gypsum and dihydrate gypsum are % and % respectively Meanwhile the chemical composition and phase XRD spectrum of the desulfurized gypsum are shown in Table 1 and Fig 1 respectively; the TG DSC analysis curve is shown in Fig 2;
·The semi hydrate content of desulfurized gypsum is adjusted as a natural plaster substitute for producing gypsum board wallboard [107] The modified treatment of desulfurized gypsum with cement inorganic waste straw fiber and other wastes can be used to manufacture high insulation and compression resistant wall materials [108]
·Lactic acid gypsum LAG the by product from lactic acid preparation has caused land occupation and environmental pollution Herein hemihydrate gypsum HHG whisker an inorganic material with
·Comparative Analysis of Hydration Expansion Performance of Desulfurized gypsum baseda/β Gypsum Jixiu Zhang 1 Ye Zhang 1 Yuanchao Miao 1 and Saihong Duan 1 Gypsum has micro expansion characteristic during the process of hydration and solidification and there are certain differences in the hydration expansion characteristics of
mortar Desulfurized gypsum is an industrial by product gypsum obtained after flue gas desulfurization in coal fired or oil fired power plants [1] Its main components and physical and chemical properties are basically the same as natural gypsum with higher purity and smaller particle size Since desulfurized gypsum contains water
·FA and GGBS were the main sources of the two different gel products while DG was mixed as a composite additive to form AFt in GGBS FA DG ternary system Fig 2 shows the particle size distributions of all solid precursors Experimental investigation of utilizing waste flue gas desulfurized gypsum as backfill materials Construction and
·Flue gas desulfurized gypsum FGD gypsum mainly originates from thermal power plants smelters and large scale enterprise boilers This article reviews the production in China and the latest beneficial utilizations of FGD gypsum China is a large coal consuming country and has always had serious SO 2 emissions Therefore the Chinese
mortar Desulfurized gypsum is an industrial by product gypsum obtained after flue gas desulfurization in coal fired or oil fired power plants [1] Its main components and physical and chemical properties are basically the same as natural gypsum with higher purity and smaller particle size Since desulfurized gypsum contains water
·Flue gas desulphurisation gypsum FGDG mainly refers to the solid by product produced via lime gypsum desulphurisation that is performed in various industries to treat flue gas after the combustion of sulphur containing fuels such as coal and petroleum [1] In the limestone gypsum flue gas desulphurisation process tons of FGDG can be produced for every 1 ton
·The results of this study indicate that the resource utilization processes of FGD gypsum are important Hg emission sources and that they should be considered with care in future emission control policies Graphical abstract Download Production and resource utilization of flue gas desulfurized gypsum in China A review Environ Pollut
Saline sodic soil colloids contain a large number of exchangeable sodium ions leading to soil aggregates breakdown clay dispersion and soil pores sodic soils improvement requires two processes providing calcium source to exchange with sodium on soil surface and removing salt through leaching or this study we used corn straw and desulfurized
A combined chemical and biological process for the recycling of flue gas desulfurization FGD gypsum into calcium carbonate and elemental sulfur is demonstrated In this process a mixed culture of sulfate reducing bacteria SRB utilizes inexpensive carbon sources such as sewage digest or synthesis gas to reduce FGD gypsum to hydrogen sulfide The sulfide is then
