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 FGD
Purpose Soil salinization is considered as the most important abiotic stress limiting crop production and degrading soil properties The purpose of this study was to investigate the effects of applied flue gas desulfurization FGD gypsum and humic acid on the amelioration of coastal saline sodic soil and their influence on rapeseed yield Materials and
This research aims to study the utilization of waste from power plants construction and demolition and agriculture by varying the ratios of flue gas desulfurization FGD gypsum construction and demolition waste CDW and oil palm trunks OPT in concrete production This research used these as the raw materials for the production of concrete bricks
This paper proposes a new technical process to utilize flue gas desulfurization FGD gypsum in fluidized beds Gypsum is stable in the inert atmosphere and instable in the reducing atmosphere The procedure proposed in this article can serve as a phosphogypsum decomposition solution and can support the future management of this by product
4 Gypsum is especially beneficial to clay soils and is also used to treat sodic soils As a source of gypsum phosphogypsum can and does substitute natural gypsum as a soil amendment in many countries including Australia Brazil and Spain to name a few Studies have even found that the application of phosphogypsum can increase crop yields in
Flue gas desulfurization gypsum FGDG is an effective soil amendment However some heavy metals present in FGDG may enter soil or groundwater due to surface rainfall causing environmental risks This study used a washing plant to investigate the improvement of saline alkaline soil via treatment with different mass ratios of FGDG and
About 100 200 million years ago the mineral gypsum calcium sulfate dihydrate [CaSO 4 ·2H 2 O] became precipitated as a result of the evaporation of seawater It is deposited in sedimentary layers in the marine environment Under high pressure and temperature gypsum is transformed into anhydrite CaSO 4 In nature gypsum and anhydrite occur as beds or
As the waste of coal fired power plant desulphurization gypsum is mainly composed of CaSO 3 and CaSO 4 which can replace Na in saline alkali soil to improve saline alkali order to study the effect of different dosage of desulfurization gypsum on the improvement of saline alkali land field experiments were carried out in Duiziliang Town
The use of phosphogypsum waste in the production of building industry products as well as for obtaining building gypsum is one of the most promising directions in the utilization of this mass
Flue gas desulfurization gypsum FGDG is an industrial by product generated during the flue gas desulfurization process in coal fired power plants whether sodic or non sodic Zhao et al 2019 monitored the reclamation of sodic soil using FGD for 17 years Other types of gypsums such as phosphogypsum and natural gypsums have been
In 1989 stacking of phosphogypsum became a legal necessity when the Environmental Protection Agency EPA banned the use of phosphogypsum In 1992 this rule was modified to allow the use of phosphogypsum with an average radium 226 concentration of less than 10 picocuries/gram pCi/g for agricultural application as a soil amendment
Flue gas desulfurization FGD gypsum is an industrial by product in coal fired power plants It is mainly composed of calcium sulfate dihydrate and minor amounts of impurities such as sodium sulfate potassium sulfate magnesium sulfate and chloride [1] The gross product of FGD gypsum has reached 550 million tons in China by 2016 [2] There is an urgent necessity
An industrially feasible process was proposed to produce α calcium sulfate hemihydrate α HH from FGD gypsum without any additives In this process an AlCl3 solution was used to promote the conversion of calcium sulfate dihydrate DH to hexagonal prismatic α HH with high strength at atmospheric pressure The phase transition kinetics of FGD gypsum
Abstract Subsoil acidity in northeast United States has been associated with decreased yield and decreased water and fertilizer nitrogen N utilization by forages Surface applications of gypsiferious products has been shown to reduce subsoil acidity largely caused by high levels of soluble aluminum Al Our objective was to test the effectiveness and safety of
In recent years the massive accumulation of industrial by product gypsum especially flue gas desulfurization FGD gypsum and phosphogypsum PG not only encroaches on lands but also causes serious environmental pollution The preparation of α calcium sulfate hemihydrate α HH from industrial by product gypsum is an important way to solve the
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 compressive
In recent years the massive accumulation of industrial by product gypsum especially flue gas desulfurization FGD gypsum and phosphogypsum PG not only encroaches on lands but also causes serious environmental pollution The preparation of α calcium sulfate hemihydrate α HH from industrial by product gypsum is an important way to solve the
posing of desulfurization gypsum or Phosphogypsum to producing CaO and SO 2 is another promising utilization method for cement as well as sulfuric acid The technologi cal process includes drying dehydration calcining cement firing sulfur dioxide purification sulfur dioxide absorption and so on The main reactions are as follows
Flue gas desulfurization FGD gypsum is an industrial by product of the desulfurization process The gross product of FGD gypsum has reached 550 million tons in China by 2016 and quite a portion
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
Gypsum in its natural state gypsum mineral as recycled and industrial waste used or waste plasterboards or as phosphate industry and thermal power plants by product phosphogypsum flue gas desulfurization gypsum has the potential to be used as a cementing/adhesive material instead of cement for ground improvement
A facile method to transform flue gas desulfurization gypsum FGD gypsum to α calcium sulfate hemihydrate α HH whiskers with high aspect ratios mediated by cetyltrimethylammonium bromide
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