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;
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
In this sense silage SG and flue gas desulfurized gypsum FGDG are two good choices as composting additives SG is made from the roughage obtained by cutting corn sorghum and other forage crops and grass; the roughage is then subjected to anaerobic fermentation by lactic acid bacteria which results in the generation of SG [19]
Effect of curing temperature on the reaction kinetics of cementitious steel slag fly ash desulfurized gypsum composites system Author links open overlay panel Siyu Duan a Hao Wu a Ke The compressive strength chemical bonding mineral composition and degree of hydration of cementitious SS FA DG blocks over a curing period of 28 days
Desulfurization gypsum is a by product of chemical recovery of sulfur from flue gas in thermal power plants to reduce air pollution Its main components are dihydrate gypsum and hemihydrate gypsum which have good solubility and are similar to natural gypsum [29] [30] There are few reports on the effect of different contents of
Shear yield stress The shear yield stress of thickened tailings is tested and the controlled shear rate CSR method is adopted that is the shear time is 0 120 s and the shear rate is 0 120 s −1; the shear time is 121 240 s and the shear rate is 120 0 s −1 in which the first 120 s is the pre shear stage and the purpose of pre
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
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]
Flue gas desulfurization gypsum FGDG is an industrial byproduct produced by limestone gypsum wet desulfurization to treat SO 2 produced by thermal power plants and coal fired plants whose main component is CaSO 4 ·2H 2 O In wet desulfurization 1 t of SO 2 produces about t of FGDG [1] [2] Some 130 million tons of FGDG were produced in 2019
The degree of composite cementitious material influence on 7 d strength is slag > desulfurized gypsum > fly ash > clinker; the degree of influence on 28 d strength is fly ash > slag > desulfurized gypsum > clinker By adding desulfurized gypsum into the bottom slag and fly ash Boonserm Kornkanok et al prepared geopolymers with NaOH and
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] Desulfurized gypsum is incorporated into the
salinity of 20 100 cm soil layer in each treatment was in the degree of mild salinization 120 168 kg N ha 1 yr 1 alone or with subsurface banded lime 224 kg ha 1 yr 1 or a one time
The influence of different amounts of gypsum on the hydration of a belite rich and a ye elimite rich belite calcium sulfoaluminate clinker BCSA was investigated
The experimental results showed that all three retarders had different degrees of retardation on desulfurized gypsum; among them citric acid had the best retarding effect When the citric acid content was % the initial and final setting times were 25 and 31 min respectively However the mechanical properties of desulfurized gypsum
Given the great environmental pressure brought by the massive stacking of solid waste red mud and desulfurized gypsum were used to prepare cementitious materials
The annual output of desulfurization gypsum in China is more than 120 million tons and it is increasing at a rate of 15 20% each year Liu et al 2021; Jian et al 2021 Desulfurization gypsum is the second largest solid waste after fly ash The primary method of disposing desulfurization gypsum is to dump it on land
Application Amount of Desulfurized Gypsum from Coal Fired Power Plants on Improving the Quality of Alkalized 236 V01．23
The appropriate use of industrial solid waste is an effective method for alleviating environmental pollution In this study the potential of using desulfurized gypsum DG phosphogypsum PG gypsum dihydrate G and calcium carbide slag CS in the production of supersulfated cement SSC was investigated
The rapid expansion of coal fired power plants has led to a significant increase in the production of flue gas desulfurization FGD gypsum a byproduct of sulfur dioxide emission control processes [1] [2] With annual global output reaching millions of tons FGD gypsum poses substantial environmental challenges due to its large scale accumulation and potential
