In this study, we conducted unconfined compressive strength tests to investigate the mechanical behavior of kaolinite, which represented clay in soft ground, at different FG and …
WhatsApp: +86 18221755073
Fluorogypsum. This waste is a solid material consisting primarily of fine particles of calcium sulfate, usually less than 0.02 mm in diameter, that is slurried for transport from the kilns to waste management units. Using available data on the composition of fluorogypsum, EPA evaluated whether the waste exhibits any of the four characteristics of
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
Zhou Wanliang, Long Jinghua, Zhan Binggen. Further Study on Property of Fly Ash-Fluorogypsum-Cement Composite Binder[J]. Journal of Building Materials, 2008(4): 179–182. Wang Jiarong, Liu Jiaxiang. Research on the Preparation of Binding Material and Concrete by Fluorogypsum and Fly Ash[J]. Multipurpose Utilization of Mineral Resources,2009(6 ...
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
Calcium sulfate-based binders are a special kind of alternative cements that can promote sustainability in construction. The starting materials are fully or partially dehydrated gypsum (where x = 0 or 0.5), with industrially produced hemihydrate (CaSO 4 ½H 2 O) obtained by dehydrating waste or natural gypsum (CaSO 4 ·2H 2 O) at temperatures below 150 °C, …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 material were also …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
The cementitious binders were prepared by intimately blending the ground fly ash (∼400 m 2 /kg, Blaine) with fluorogypsum, hydrated lime sludge, Portland cement and a suitable chemical activator in different proportions followed by inter-grinding in a ball mill to the fineness of a specific surface area of 410 m 2 /kg (Blaine) (Table 3).The cementitious binders were tested …
WhatsApp: +86 18221755073
Blended Calcium Sulfate (BCS) is fluorogypsum (FG), an industrial by-product, blended with lime or limestone. Approximately 90,000 metric tons (100,000 tons) of FG are generated annually in the United States, posing a serious problem for environmental disposal. The Louisiana Department of Transportation and Development (LA DOTD) has been using
WhatsApp: +86 18221755073
7.4 Fluorogypsum 7.4.1 Superior Properties of Fluorogypsum to Propel Demand 7.5 Phosphogypsum 7.5.1 Rising Demand for Phosphogypsum in Agriculture Sector to Drive Market 7.6 Other Types. 8 Synthetic Gypsum Market, by Application. 8.1 Introduction 8.2 Cement
WhatsApp: +86 18221755073
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].
WhatsApp: +86 18221755073
fluorogypsum received from South Africa and ordinary Po rtland cement. The SSC was eval uated for its physical, c hemical a nd mechanical properties as per I S: 6909: 1990 [26].
WhatsApp: +86 18221755073
FGD gypsum is a by-product of the recovery of sulfur oxides from the flue gases generated at power plants that burn coal. A natural contaminant of coal, sulfur is almost completely …
WhatsApp: +86 18221755073
This research aims to develop a concrete-like material for underwater construction applications by using fluorogypsum (FG, an industrial by-product of hydrofluoric acid production), class C fly ash, and type II Portland cement. Two Response Surface Models (RSMs) were derived based on compressive strength tests and expansion measurements on FG-based blend cylindrical …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
Under the old parish Police Jury, parish officials used two kinds of locally produced industrial by-products as road base: fluorogypsum, marketed at one time as Florolite, and Pisolite. …
WhatsApp: +86 18221755073
The waste fluorgypsum was modified and applied as a cement retarder. The main chemical composition and mineral structure of the waste fluorgypsum were analyzed. Scanning electron microscopy (SEM) and eight-channel micro-calorimeter (TAM Air) were employed to analyze the changes in morphology and study the application performance of the modified …
WhatsApp: +86 18221755073
A process, and the product produced thereby, for the preparation of a waste solidification material from hardened fluorogypsum as a by-product of the manufacture of hydrofluoric acid by reacting fluorospar with sulfuric acid, removing hydrogen fluoride from the reaction product, slurrying the by-product with water, placing the slurried by-product fluorogypsum in settlement ponds until …
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
In this paper, the physicochemical properties and hydration mechanism of cement-free binders developed from fluorogypsum has been discussed. The results showed maximum attainment of strength (38 MPa), low water absorption (<5%) and porosity (<10) with anhydrous calcium chloride and sodium sulphate activators. The enhancement in strength with ...
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
Fluorogypsum (CaSO 4 ·H 2 O), 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. The high solubility of fluorogypsum (FG) has limited its usage to dry applications. Previous research has demonstrated that stabilizing phosphogypsum, a ...
WhatsApp: +86 18221755073
The State of Louisiana faces severe soil erosion along its coastlines. Coastal protection structures most commonly are made of limestone and concrete. However, in Louisiana, these materials are not widely available, which makes it significantly expensive to protect the coastlines and marine life. This study proposes to use locally available materials that have …
WhatsApp: +86 18221755073
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
WhatsApp: +86 18221755073
Fluorogypsum is a by-product of hydrofluoric acid production. China discharges approximately 1 million t of fluorogypsum every year, and the accumulation of fluorogypsum has reached 400 million t [5]. Red gypsum is largely discharged in the sulphate process that treats waste sulphuric acid with lime or limestone [10].
WhatsApp: +86 18221755073
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.
WhatsApp: +86 18221755073
A composite binder of high strength and low water absorption has been developed using industrial by-products fluorogypsum, granulated blast furnace slag and Portland cement.The development of strength in the binder at an early age is attributed to the conversion of anhydrite into gypsum and at later age is due to the formation of ettringite and tobermorite, as a reaction …
WhatsApp: +86 18221755073
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 …
WhatsApp: +86 18221755073
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 ...
WhatsApp: +86 18221755073
Fluorogypsum is the waste residue produced by using fluorite to produce fluorine chemical products in the industry. Every 1 ton of fluorine chemical products produced usually produces about 4 tons of fluorogypsum [7]. Strong acidity and extremely low activity are the most significant features of fluoride gypsum. This leads to its weak ability ...
WhatsApp: +86 18221755073
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, …
WhatsApp: +86 18221755073
Cementitious composites based on 50–80% fluorgypsum, 15–50% OPC and 0–15% PFA, were wet and dry cured for up to 180 days at 20 and 60 °C.All pastes developed and maintained strength up to 32 MPa, even under water.Characterization by thermal analysis and X-ray diffraction indicated that gypsum formed intensively in the first days, providing the initial …
WhatsApp: +86 18221755073