The α hemihydrates gypsum is obtained by hydrothermally treating desulfurization gypsum paste with crystal modifier at the heating up time 75min and the autoclaved temperature 120°C And the
According to statistics the annual output of desulfurization gypsum in 2014 was about million tons China s 13th five year plan puts forward that it is necessary to speed up the recycling of waste resources Hao et al 2016 Ding et al 2021 Ding et al 2023a 2023b Thereforethe desulfurization gypsum has excellent utilization prospects
In order to upgrade the utilization of flue gas desulfurization FGD gypsum crystal modifier aluminum sulfate Al2 SO4 3 was added into FGD gypsum to prepare calcined gypsum by calcining at normal pressure and the effect of Al2 SO4 3 addition on the performance of calcined gypsum was studied The results show that the addition of Al2 SO4 3 to FGD
Flue gas desulfurization FGD gypsum is a byproduct generated in large volumes during the calcium based wet desulfurization process in coal burning power plants and is mainly composed of calcium sulfate dihydrate >90 wt% CaSO 4 ·2H 2 O DH For the sake of environmental protection and natural gypsum mine conservation the recycling and use of FGD
Recently the morphology controlled crystallization of gypsum has attracted considerable attention owing to their various applications [1] [2] [3] [4] As an inorganic material gypsum also known as calcium sulfate dihydrate CSD includes natural gypsum and chemical gypsum Industrial by product gypsum [5] [6] [7] Flue gas desulfurization FGD gypsum is
F lue gas desulfurization gypsum FGDG is a synthetic gypsum that is created during the removal of SO 2 from flue gas by reacting the SO 2 with calcite CaCO 3 to form calcium sulfite CaSO 3 · 2 O which is further treated with wet limestone and forced oxidization to form calcium sulfate CaSO 4 ·2H 2 O Laperche and Bigham 2002 Synthetic
Crystal growth of CaSO 4 ·2H 2 O have been extensively studied using pure calcium chloride and sodium sulfate solutions to simulate the gypsum crystallization process [4][5][6][7][8][9] [10] [11
Semantic Scholar extracted view of "The influences of gypsum water proofing additive on gypsum crystal growth" by Jianquan Li et al In this paper the waterproofness of desulfurization building gypsum had been improved by polyacrylamide PAM emulsion Different weight ratios of Portland cement Expand 6 [PDF] 1 Excerpt;
According to statistics the annual output of desulfurization gypsum in 2014 was about million tons China s 13th five year plan puts forward that it is necessary to speed up the recycling of waste resources Hao et al 2016 Ding et al 2021 Ding et al 2023a 2023b Thereforethe desulfurization gypsum has excellent utilization prospects
In this study we propose a process making calcium carbonate and calcium sulfate and recovering absorbent using ammonia absorbent carbon dioxide and industrial waste The main objective of this study is to confirm the possibility of carbon capture and utilization based on waste materials We assumed desulfurization gypsum and construction waste ready mixed
Flue gas desulfurized gypsum mainly comes from thermal power plants smelters and large enterprise boilers and contains industrial by products produced through a wet desulfurization combustion process where SO 2 gas and lime slurry react under strong oxidation conditions The main component of this gypsum is calcium sulfate dihydrate which also
This study investigated the effects of combined mixed application of desulfurization gypsum and biochar on crop growth and soil properties in the saline alkali soils of coastal mudflats through indoor pot experiments and eight experimental ameliorant treatments Among them CK was the control of newly reclaimed cropland in the study area with no added
Desulfurization gypsum based composite cementitious materials were prepared by adding certain proportions of sulfoaluminate cement mineral powder quick lime retarder and water reducer into the
The α HH powders were repeated heating cooling and weighing until the constant weight The test steps of the crystal water were as follows 1 sodium tartrate in a high concentration also extended the time needed for the complete transformation of flue gas desulfurization gypsum FGD into α HH However the effect of potassium sodium
The curves of the viscosity and temperature of the B liquid with the hydration time are shown in Figure 4 The hydration of CaSO 4 · 2 O is an exothermic process and the viscosity and
The influence of carboxyl number carboxyl distance and other auxiliary groups such as hydroxyl double bond and its cis/trans structure of organic acid on the crystal morphology of α hemihydrate desulfurization gypsum were crystal modification mechanism of organic acids was analyzed from the point of adsorption and crystal results showed that
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
Desulfurization gypsum was taken from a power plant in Hohhot Inner Mongolia China The main chemical compositions of the raw materials analysed by XRF are shown in Table 2 It is evident that coal gangue primarily consists of SiO 2 and Al 2 O 3 Carbide slag exhibits a high content of CaO while desulfurization gypsum mainly contains CaO
This leads to a continuous increase in production of flue gas desulfurization gypsum FGDG Flue gas desulfurization can be generally divided into wet semi dry and dry processes which generate different desulfurization products Córdoba 2015 The wet desulphurization is most widely applied due to its high efficiency stable operation and
Desulfurization gypsum is a kind of solid waste with CaSO 4 ‧2H 2 O as the main component produced in the process of limestone based flue gas desulfurization About 100 million tons of desulfurization gypsum was produced every year in China Wang et al 2020 On the one hand it has a high content of Ca 2 and is suitable for CO 2 sequestration On the other hand
PDF On Sep 10 2022 Shuaifeng Liu and others published Preparation of α High Strength Hemihydrate from Flue Gas Desulfurization Gypsum in AlCl 3 MgCl 2 Solution at Atmospheric Pressure
CTAB as the crystal modifier can significantly promoted 1 D growth of α HH whiskers along the c axis and the presence of % CTAB by weight of FGD gypsum resulted in the increase of the
It has been documented that the addition of desulfurization gypsum DG can improve the engineering properties of OPC The soaked specimens were then dried at 50 °C in an oven until a constant weight was attained Furthermore there was a peak of anhydrite crystal in G60 F28 D12 which implied that some DG did not participate in AFt
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