Results show that the addition of calcined FGD gypsum and active calcium aluminate is able to improve the early compressive strength but using more FGD gypsum and a high sulfur aluminum ratio
Recycling industrial solid waste for mine backfill is one of the best ways to achieve green production in multiple industries In this paper the desulfurization gypsum DG as an activator is combined with the modified magnesium slag fly ash cementitious paste backfill MFPB technology for the co disposal of solid waste and goaf treatment and the influence of
The desulfurized gypsum application rates varied between 0 and 50 t·hm 2 across six treatment levels based on the soil Na and Mg 2 exchange capacity A control group was included at 0 t·hm 2 Each treatment consisted of five experimental plots including three for soil profile sampling and two for backfilling to mitigate the impact of
At present several research teams have investigated many research areas pertaining to the improvement of the water resistance of gypsum Zhao Feng qing 8 has studied the mixing of water repellent agents that are prepared by granular blast furnace slag high calcium fly ash and some additives with calcined desulfurized gypsum; this was aimed at preparing a
To solve the problems of difficult treatment of desulfurized gypsum and overmining of limestone a kind of lime/gypsum flue gas desulfurization FGD collaborative desulfurized gypsum resource utilization process LCS was proposed The system mainly
With steel slag and desulfurized gypsum as main raw material mixed appropriate amount slag and compound addition a little of activator and based on orthogonal test we explored the slag dosage the proportion of the combined admixture activator and the desulfurized gypsum dosage impact on the performance of clinker free cementing material such as
Because the nature of FGD gypsum is similar to that of natural gypsum some researchers have tried to use it instead of natural gypsum in the improvement of saline alkali land However since some enterprises introduced flue gas purification technology and synergistic mercury removal process several hazardous pollutants in coal would inevitably transfer into
As a relatively fast setting building material desulfurized gypsum is difficult to use Citric acid sodium gluconate and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined retarders The
This work aimed to investigate the feasibility of utilizing the low quality desulfurization ash from semi dry flue gas desulfurization by mixing with α hemihydrate gypsum and then the environmental issues resulted from low quality desulfurized ash from semi dry flue gas desulfurization can be resolved and both economic and ecological benefits are brought to
As a relatively fast setting building material desulfurized gypsum is difficult to use Citric acid sodium gluconate and sodium tripolyphosphate were used to design and prepare a desulfurized gypsum paste containing single or combined retarders The effects of the retarder type and content on the setting inhibition and mechanical properties
The test results show that sodium sulfate has a poor improvement effect on the sample due to the presence of desulfurized building gypsum in the composite cementing system while calcium chloride
The utilization of desulfurized building gypsum as raw material for gypsum based self leveling mortar GSL is limited by its low strength and poor water resistance The objective of this study
Desulfurized gypsum a by product of thermal power plants for removal of sulfur from coal may be used as an external source of Ca2 for reclamation of saline sodic soil in this plain because it
The use of FGD gypsum has significant environmental benefits including reducing the amount of waste sent to landfills and reducing the need for virgin natural resources α HH gypsum using flue gas desulfurized gypsum is essential for the utilization of calcium and sulfur resources An aspect ratio AR close to 1 is essential to improve
Geopolymer is an emerging green cementitious material that can be used to stabilize dredged clay DC as construction materials This paper presented an experimental study on the effects of desulfurized gypsum DG on the mechanical properties stress strain characteristics unconfined compressive strength UCS and water stability of stabilized DC
The utilization of desulfurized building gypsum as raw material for gypsum based self leveling mortar GSL is limited by its low strength and poor water resistance The objective of this study is to enhance comprehensive properties of GSL and prepare qualified desulfurized building gypsum based self leveling mortar that can be effectively applied in
The production of flue gas desulfurization gypsum poses a serious threat to the environment Thus utilizing gypsum based self leveling mortar GSLM stands out as a promising and effective approach to address the issue β hemihydrate gypsum cement polycarboxylate superplasticizer hydroxypropyl methyl cellulose ether HPMC retarder and defoamer were
The desulfurized gypsum not only has a high content of gypsum > 900 g kg − 1 but also has a low price < 50¥ t − 1 We therefore conducted a study to determine how effective desulfurized gypsum is at reducing sodicity improving the physical and chemical properties of the soil and improving the growth and yield of rice in these saline
The XRD patterns of the FGDG before and after dehydration were tested using a D8 Advance X ray diffractometer Bruker Germany with a scan range of 5 80° and a scan rate of 5°/min as presented in Fig 2 Production and resource utilization of flue gas desulfurized gypsum in China A review Environ Pollut 2021 Article 117799
Desulfurized ash contains about % hemihydrate calcium sulfite % calcium carbonate % dihydrate gypsum % calcium hydroxide % calcium oxide Particle size distributions of hemi hydrate gypsum and desulfurized ash are given in Fig 1 A The specific surface areas of desulfurized ash and hemihydrate gypsum are 351 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
Like natural gypsum the application of flue gas desulfurization gypsum FGDG with irrigation provides economic and environmental value Wang and Yang 2018; Watts and Dick 2014 FGDG is of low cost because it is a side product of sulfur removal from fuel combustion in coal fired power plants and does not require mining and processing
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