Fluorogypsum, a waste from hydrofluoric industry contains the impurities of fluoride and free acidity which adversely affect the setting and strength development of plaster and its product. In India about 1.0 million tonne per annum of fluorogypsum is available from different hydrofluoric acid manufactuerers. In South Africa there is about ...
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FLUOROGYPSUM can advantageously replace traditional cement as a binder for screed mortars. It is widely used in floor screen applications because of its numerous advantages: better …
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Fluorogypsum is a by-product of hydrofluoric acid produced by Honeywell in Geismar along La. 30. Pisolite and red mud are by-products from the refinement of bauxite ore into alumina, a material that is turned into aluminum. Pisolite, which was sold by the old Kaiser Aluminum plant in Gramercy in the late 1980s, is stored in large dry stacks ...
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Given the issues related to poor hydration activity, long setting time and low early strength of industrial by-product fluorogypsum (FG), the composite modifiers (Na 2 SO 4 and NaNO 2) were utilized to enhance its reactivity.The investigation of the mechanism involved the utilization of contemporary analytical methods, including X-ray diffraction (XRD), 1 H low-field …
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The use of man-made fluorogypsum instead of natural gypsum or other traditional materials allows one to reduce raw material costs. Waste fluorogypsum is often obtained in the process of industrial production and can …
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Fluorogypsum (FG) is a byproduct of hydrofluoric acid production. In China, production of one ton of HF can produce four to five tons fluorogypsum. Over 400 million tons …
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This paper investigates the mechanical properties under laboratory and field conditions of a concrete-like blend made of fluorogypsum (FG), fly ash, and Portland cement …
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The sample of fluorogypsum was analysed for various constituents such as SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, SO 3, CaF 2 and pH as per standard test procedures [12], [13] and characterised by differential thermal analysis (DTA) (Stanton Red Croft, UK), X-ray diffraction (Rigaku D-Max 2200) and scanning electron microscopy (SEM) (LEO 438 VP, UK). The …
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Introduction Fluorogypsum (FG), a waste of hydrofluoric acid industry, has been studied for use as building material . Water-resistant binding materials can be produced from phosphogypsum, slag, cement, fly ash and lime sludge. Impurities (fluoride) present in FG may interfere with setting and strength development of plaster/ building components. This paper …
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Fluorogypsum binders with OPC and PFA additions, strength and reactivity as a function of component proportioning and temperature. Cem Concr Comp 2008;30:88–96. [11] Fraire-Luna PE, Escalante-Garcia JI, Gorokhovsky A. …
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A new type of paste filling material was created using fluorogypsum, a byproduct of hydrofluoric acid, as the raw material to address the issue of the filling material's high cost. The effects of five factors, including gangue, fly ash, fluorogypsum, lime content, and mass concentration on the physi …
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A composition with 62% pH-adjusted fluorogypsum, 35% fly ash, and 3% Portland cement was selected based on strength and volumetric expansion properties to conduct additional experimental studies ...
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This study focuses on the effect of Na 2 SO 4 and NaNO 2 on the modification of fluorogypsum, and the performance of the modified fluorogypsum in construction applications was assessed by evaluating its setting time, mechanical strength, and water resistance.
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Fluorogypsum is generated during the production of hydrofluoric acid. In China, every ton of hydrofluoric acid produces 4–5 tons of fluorogyp-sum [1]. Its main physical phase is CaSO4, which contains a small amount of unreacted CaF2 impurities compared with natural anhydrite. The physical and chemical properties
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Fluorogypsum (FG), a by-product obtained during the production of hydrofluoric acid, satisfies these conditions, as it is capable of binding granular materials. Approximately 894,000 metric tons ...
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Fluorogypsum (FG) is a by-product of the production of hydrofluoric acid and mainly consists of anhydrite. Flue-gas desulfurization (FGD) gypsum is the waste produced during the flue-gas desulfurization process in thermal power plants. Both of them have the characteristics of large output, high purity, and difficulty in being reused.
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Fluorogypsum is an industrial waste from the production of hydrofluoric acid, and its main component is anhydrous gypsum with very slow hydration, inducing its application only as plastering mortar [23] or cement retarder [24]. Our group has reported the research work on the fluorogypsum which was employed as cement retarder [24].
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@article{Huang2016MechanicalPA, title={Mechanical properties and hydration mechanisms of high-strength fluorogypsum-blast furnace slag-based hydraulic cementitious binder}, author={Xuquan Huang and Jiang Mingming and Xiaorong Zhao and Cilai Tang}, journal={Construction and Building Materials}, year={2016}, volume={127}, pages={137-143}, …
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Fluorogypsum, a by-product of hydrofluoric acid manufacturing; Phosphogypsum, a by-product of phosphoric acid manufacturing; Titanogypsum, a by-product of titanium dioxide manufacturing. 3. FGD Gypsum is Created at Power Plants
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Fluorogypsum (CaSO4·H2O), a by-product of the hydrofluoric acid production process, is a low cost, locally available material that is currently being utilized as road bed material.
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A new type of paste filling material was created using fluorogypsum, a byproduct of hydrofluoric acid, as the raw material to address the issue of the filling material's high cost. The effects of five factors, including gangue, fly ash, fluorogypsum, lime content, and mass concentration on the physical and mechanical properties of filling ...
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This paper investigates the mechanical properties under laboratory and field conditions of a concretelike blend made of fluorogypsum (FG), fly ash, and portland cement for artificial-reef construction, which is referred to as a FG-based blend. The 28-day compressive strength and relative volumetric expansion of the FG-based blend were ...
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Fluorogypsum contains impurities of fluoride and free acidity. These impurities particularly free acidity may interfere with the setting and strength development of plaster/building components. Since the utilization of fluorogypsum is limited, thus, there is a disposal problem of this waste and it has become essential to suitably utilize the ...
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Fluorogypsum (FG), a by-product obtained during the production of hydrofluoric acid, satisfies these conditions, as it is capable of binding granular materials. Approximately 894,000 metric tons are annually produced in the U.S. However, data on the mechanical strength of clay–FG mixtures are unavailable. In this study, we conducted ...
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The addition of fluorogypsum facilitated the formation of AFt, while KH 2 PO 4 regulated the slurry's pH, concurrently enhancing AFt production, and the morphology of AFt transformed from acicular to a more slender fiber shape, which exhibited improved interlacing and overlapped properties, thereby promoting strength development. The hydration ...
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A composition with 62% pH-adjusted fluorogypsum, 35% fly ash, and 3% Portland cement was selected based on strength and volumetric expansion properties to conduct additional experimental studies to quantify its modulus of elasticity, Poisson's ratio, setting times, density, void contents, and curing time effects on strength and volumetric ...
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RESEARCH ARTICLE Study on the proportion of paste filling materials based on fluorogypsum Wang Chun1,2,3, Li Xin-ru2, Cheng Lu-ping ID 2*, Xiong Zu-qiang2, Zhan Shuai-fei2 1 Sinosteel MaAnShan General Institute of Mining Research Co., LTD, Maanshan Anhui, China, 2 School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo …
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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.
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Download Table | Chemical composition of fluorogypsum from publication: Formulation of Sulphate Resistant Super Sulphated Cement Using Fluorogypsum and Granulated Blast Furnace Slag | Present ...
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A new type of paste filling material was created using fluorogypsum, a byproduct of hydrofluoric acid, as the raw material to address the issue of the filling material's high cost. …
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Aiming at the issues of poor hydration activity, long setting time, and low early strength in industrial by-product fluorogypsum (FG), 1,2,3-propenyltricarboxylic acid (PA) was utilized to enhance its reactivity. The mechanism was investigated using modern analytical techniques such as XRD, 1 H low-field NMR, and FTIR spectroscopy. The results ...
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DOI: 10.1016/j.jmrt.2024.12.215 Corpus ID: 275061073; Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum @article{Zhu2024EffectON, title={Effect of NH4+ on the hydrothermal formation of calcium sulfate hemihydrate whiskers from fluorogypsum}, author={Jianping Zhu and Qilin Wang and Zuolin Wang and Haixia Liu and …
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Additional types of synthetic gypsum include titanogypsum, phosphogypsum, fluorogypsum, and citrogypsum. Composed of calcium sulfate dehydrate, synthetic gypsum has the same characteristics as natural gypsum, and can be used interchangeably with natural gypsum for various applications including soil amendments and cement.
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Fluorogypsum Because fluorogypsum is the only sulfate waste that dehydrates to form a solid instead of remaining a slurry or sludge, it has somewhat unique properties or characteristics, …
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Present studies deal with the formulation of sulphate resistant super sulphated cement using flourogypsum (83 %), granulated blast furnace slag (10 %) and OPC (7%) by grinding and blending in a...
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Fluorogypsum is an industrial waste from the production of hydrofluoric acid, and its main component is anhydrous gypsum with very slow hydration, inducing its application only as plastering mortar [23] or cement retarder [24].Our group has reported the research work on the fluorogypsum which was employed as cement retarder [24].The storage of the by-product …
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Fluorogypsum, fly ash, Portland cement, and alum were blended. The mixture was ground in a ball mill to a fineness similar to that of Portland cement. The mortars were mixed by machine for 3 min, cast into 40 × 40 × 160 mm moulds for the strength test or 40 × 40 × 140 mm moulds with 4-mm diameter steel limiting frame for the volume variance ...
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