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 and mineral powder can …
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The fast mass transfer between the gas and solid, long residence time and extensive heat transfer are benefit for gypsum decomposition, while, the original size of the gypsum is too fine to well fluidized and easily entrained out the reactor. The only solution is …
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and gypsum produced from it is still poorly understood. This article focuses on the role of water on the properties of gypsum produced from a β-hemihydrate due to its combined effect on both hydration and dehydration. The microstructure and mechanical properties of the gypsum beyond hydration and dehydration is investigated. 2.
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The invention discloses a desulfurized gypsum calcination apparatus which comprises a hot gas source device, a gypsum conveying device, a calcination device and a tail gas absorption device, wherein the hot gas source device is connected with the inlet end of the calcination device through a first pipeline; the outlet end of the calcination device is connected with the tail gas …
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To solve the problem of the low early strength of the fly ash-desulfurized gypsum system, this study innovatively uses sulfate to increase its early strength without shrinking late …
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Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. In China, a small amount of FGDG is used as cement additives or for gypsum boards, but there still exist a mass of FGDG due to the lack of reusing methods. Also, the waste fly ash (WFA) is another waste material from the power plant.
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Ordinary Portland cement (OPC) is the most widely used binder material, but the OPC calcination process consumes a lot of energy [12].It has been reported that the total CO 2 emissions generated during cement production account for 8 % of the total global CO 2 emissions [11]pared with silicate cement, geopolymer has the advantages of large raw material …
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Fly ash and desulfurized gypsum used in this experiment were from Shanxi Power Generation Co., Ltd. The coal gangue came from Yangquan, Shanxi. The cement was ordinary 42.5 cement sold on the market. The main chemical components of red mud, fly ash and desulfurized gypsum were analyzed by XRF, and the results are shown in
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In order to realize the reutilization of industrial waste red mud and desulfurized gypsum whiskers, a novel ceramsite was fabricated using red mud and desulfurized gypsum whiskers for the adsorption of Pb(II). The study investigated the impact of red mud / desulfurized gypsum whiskers mass ratio, coupling agent dosages and calcination temperature on the …
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The hammer mill, being a short-time calcining system, grinds, dries, calcines and classifies the raw gypsum in a single step. The resulting stucco is suitable for the production of plasterboard, gypsum fiberboard and gypsum wall blocks. A hammer mill can process moist FGD gypsum, pre-crushed natural gypsum, or a mixture of both.
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Molding gypsum is obtained at the Samara Gypsum Combine (SGC) by mixing gypsum binders of high grade and purity and definite separation of α and β modifications with the use of modifying additives. All this taken together gives uniformly arranged one-dimensional capillary pores in gypsum molds and provides a high degree of filtration with ...
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The invention discloses a calcination-free desulfurized gypsum brick, pertaining to the production field of building bricks. The gypsum brick is produced by the following ingredients by weight proportion: 25-35 portions of desulfurized dehydrate gypsum; 10-20 portions of cement, 50-65 portions of aggregate, 0.2-1.5 portions of intensifier and 3-5 portions of solid-phase cementing …
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During calcination, gypsum is subjected to heating to eliminate its chemically attached water, thus transforming it into a more stable and valuable substance, which is mostly deployed as plaster of Paris. ... of course, performance is a significant deal. Integration in Gypsum Board Production. The addition of calcined gypsum in producing gypsum ...
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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 effects of various types of gypsum and their dosages on the performance and hydration process of SSC were thoroughly examined. The results ...
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Using Portland cement for soil solidification has sustainability issues due to high energy-consumption and carbon emissions.An innovative approach suggests using titanium slag and flue gas desulfurized gypsum as substitutes for Portland cement for soil solidification. This study systematically evaluates the effects of titanium slag-flue gas desulfurized gypsum …
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The ultra-high addition of 20 % desulfurized gypsum is beneficial to improve the strength of DG-based binary cementitious materials with low energy consumption. The …
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Innogyps has extensive experience in performing calcinations on natural rock gypsum, FGD and phosphogypsum and can help you to evaluate your supply of gypsum. We have the lab scale …
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Interpretation: The odor of desulfurized gypsum treated with ammonia affects the delivery, which can be solved by adding a certain proportion of quick lime. ... wash treatment before calcination ...
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Cover Crop Complements Flue Gas Desulfurized Gypsum to Improve No-till Soil Quality Khandakar R. Islam a, Greg Roth b, Mohammad A. Rahman a, Nataliia O. Didenko c, and Randall C. Reeder d aSoil, Water and Bioenergy Resources, The Ohio State University South Centers, Piketon, Ohio, USA; bDepartment Of Plant Science, Pennsylvania State University, University …
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3.1.1. Desulfurized Gypsum . The performance parameters of the BPG-based cementitious materials involved in the third part are shown in Table 3. Lv et al. investigated the influence of desulfurized gypsum (DG) on the rheological properties and expansion rate of ordinary Portland cement (OPC). The study revealed that the impact of DG on the ...
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Substitute kaolin and calcite to produce paper filler and sizing material, and use it together with natural gypsum to produce gypsum board. The material is crushed by the crusher to the …
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When preparing plastering gypsum, it can be found that different gypsum raw materials, different calcination conditions, different finenesses, and different water-gypsum …
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Content from this work may be used under the terms of the CreativeCommonsAttribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of ...
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The crusher breaks large gypsum rock into small particles of less than 25 mm in diameter, the particles go through storage and transportation equipments into the mill for grinding, use a powder concentrator to select qualified gypsum powder of required fineness and send them into the boiling furnace for calcination.
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Gypsum is the crystalline chemical compound CaSO4·2H2O. A close chemical relation – and frequently occurring with Gypsum – is Anhydrite which is CaSO4. Gypsun has …
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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. ... calcination temperature of β -hemihydrate gypsum is signicantly lower than that of cement, usually within a range of 135–180°C, and it can be fully recycled (Lushnikova and ...
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In this paper, coal gangue, carbide slag and desulfurized gypsum (DG) were used as raw materials to calcine the all-solid-waste-based belite sulphoaluminate cement (BSAC), …
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gypsum by calcination and hydration to readily complete the transition. The pretreatment deteriorated the crystallinity of FGD gypsum and caused it to form small irregular flaky crystals, which dramatically increased the specific surface area. Additionally, most of the organics adsorbed onto FGD gypsum surfaces were removed after pretreatment. The
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The compaction effect and settlement were assessed through field tests. Abstract. Flue gas desulfurized gypsum (FGDG) is a waste material produced in the power stations during the flue gas desulfurization process. ... FGDG is also used to produce CaS O 4 ∙ 0.5 H 2 O or CaS O 4 by calcination method [10], [11].
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A method for co-producing sulphoaluminate cement and sulfur by using desulfurized gypsum and aluminum ash, comprising: (1) drying aluminum ash, and heating desulfurized gypsum for dehydration to obtain semi-hydrated gypsum; (2) mixing the aluminum ash with the semi-hydrated gypsum according to a preset ratio, pulverizing, and homogenizing; (3) calcining the pulverized …
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FGD-gypsum and cover crop effects on soil physical properties. Bulk density (ρb), as a measure of soil compaction, was significantly affected by FGD-gypsum and cover crop managements (Table 7). FGD-gypsum amendments marginally decreased ρb, while the cover crop significantly decreased the ρb by more than 4% compared to the control.
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Gypsum has micro-expansion characteristic during the process of hydration and solidification, and there are certain differences in the hydration expansion characteristics of different types of ...
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1. Calcination process of desulfurized gypsum (1) Low temperature and slow calcination. Low-temperature slow-speed calcination means that the material stays in the calcination equipment for a long time, and the feeding and discharging time is at least tens of minutes.
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Gypsum Calcination. Calcination is the practice of dehydrating gypsum into plaster or stucco through a batch or continuous process which includes heating the gypsum to evaporate the crystalline water. Typically, free water is removed in an initial process at approximately 45℃ and crystalline bound water is removed in a second process at 120 ...
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Red mud (RM) is the major waste with strong alkaline discharge produced in alumina manufacturing. The main chemical compositions are Fe 2 O 3, Al 2 O 3, and SiO 2, which are similar to those of the raw materials for SAC.RM is a kind of waste with large output and serious pollution, and its effective disposal is the important problem facing the environment at …
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