application of phosphogypsum in casting

Phosphogypsum Wikipedia

Phosphogypsum is the calcium sulfate hydrate formed as a by-product of the production of fertilizer from phosphate rock. It is mainly composed of gypsum (CaSO 4 ·2H 2 O). Although gypsum is a widely used material in the construction industry, phosphogypsum is usually not used, but is stored indefinitely because of its weak radioactivity caused by the presence of naturally occurring uranium

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Phosphogypsum an overview ScienceDirect Topics

Phosphogypsum is a waste by-product from the processing of phosphate rock in plants producing phosphoric acid and phosphate fertilizers, such as superphosphate. The wet chemical phosphoric acid treatment process, or ‘wet process’, in which phosphate ore is digested with sulfuric acid, is widely used to produce phosphoric acid and calcium sulfate, mainly in dihydrate form (CaSO 4 · 2H 2 O):

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Phosphogypsum An Industrial Byproduct with Value

Outside the borders of the US, phosphogypsum is widely used in a number of applications (in India, phosphogypsum has been redefined as a co-product, further encouraging its reuse). Like many industrial byproducts, its use is frequently seen in the agriculture and construction industries Use as a Soil Amendment. Gypsum is a widely recognized soil conditioner, offering a number of benefits to

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RADIOLOGICAL IMPLICATIONS OF USING PHOSPHOGYPSUM AS

The application of PG as soil amendment is mainly due to the characteristics of CaSO 4, which improves the root penetration in soil. It provides calcium in the soil depth, reduces the aluminium saturation and favours the absorption of water and nutrients. Therefore, it is a common practice in the Brazilian agriculture to use the phosphate fertilizers mixed with PG. NORM IX Denver 2019

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Phosphogypsum an overview ScienceDirect Topics

The main concern about the phosphogypsum was not land application since it is often disposed of in large piles, but if the concentrations of radioactive elements are high enough then radioactivity can become excessive on the pile boundaries. They reported that most of the radium from the phosphate rock goes into the gypsum fraction, whereas thorium and uranium remain with the phosphoric acid

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(PDF) Application of phosphogypsum in soil stabilization

The aim of this work was to use phosphogypsum (FY) waste in a sustainable paving practice involving the production of FY-foamed bitumen for road applications. For this proposal, three FY types

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(PDF) PHOSPHOGYPSUM ANALYSIS: TOTAL CONTENT AND

Phosphogypsum with a high content of natural radionuclides, specifically those present in the decay series of ²³⁸U and ²³²Th, is a byproduct (waste material) of a chemical reaction between

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Chemical treatment of phosphogypsum and its potential

01/01/2019· The application of phosphogypsum in production of binding materials is burdened by the presence of phosphate, flourides and other soluble impurities. Nevertheless, the phosphogypsum is successfully applied for the production of anhydride cement in some countries [23]. Calcium oxide content in building material (Portland cement) and slag cement is 62% and 40%, respectively. Calcium

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Production of Beneficiated Phosphogypsum for Cement

phosphogypsum by washing, thermal, and chemical treatments have been already reported9-" Investigations were taken up to improve the quality of phosphogypsum for use in cement and * Author for correspondence. other applications. Based on the wet sieving of the phosphogypsum, a pilot plant of capacity It/shift has been installed at CBRI and successfully run to make beneficiated phosphogypsum

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Laboratory Study of Phosphogypsum, Stabilizers, and

Phosphogypsum (PG) is a by-product of the phosphoric acid fertilizer industries that has possible applications in paving when stabilized with cement or lime. This study’s aim is to compare the mechanical performance of the hemi-hydrate (HH) and dihydrate (DH) mixes with tropical soil, lime, and cement. The results of physical, mechanical, and mineralogical tests are presented, which

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performance of cast-in-situ © The Author(s) 2018

The application of cast-in-situ phosphogypsum wall could consume a large amount of pollutant, and improve the efficiency of building construction. Methods: The preparation and thermal insulation performance of cast-in-situ phosphogypsum wall were investigated. The property of phosphogypsum–fly ash–lime (PFL) triad cementing materials, the adaptability of retarders and

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EPA Approves Use of Phosphogypsum in Roads

According to TFI, several studies have shown that the incorporation of phosphogypsum into concrete can even provide some benefits, improving long-term strength. Its use would be especially beneficial in civil engineering work involving casting in hot weather, the formation of deep retaining walls, and casting of mass concrete and repair projects.

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Stress-strain relationship and seismic performance of cast

Conclusions: The stress-strain relationship for earthquake-resistant performance of cast-in-situ phosphogypsum walls is better than that of aerated-concrete masonry walls. The curve of stress-strain relationship and the evaluation of earthquake-resistant performance provide theoretical support for the application of cast-in-situ phosphogypsum

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Seismic Behaviour of Cast-In-Situ Phosphogypsum

The ratio of concrete and phosphogypsum in the structure is 1 : 0.71, which indicates that a large number of applications of phosphogypsum can be realized in the building structure. (a) (b) (c) (a) (b) (c) Figure 6 . Guizhou Machangping high-rise housing. (a) Building elevation. (b) Structural plan. (c) Structural space diagram. According to this project, the construction technology of cast-in

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SeismicBehaviourofCast-In-SituPhosphogypsum-Reinforced

phosphogypsum, then the grid frame becomes the main load-bearing framework of the structure [15]. erefore, cast-in-situ phosphogypsum is the first line of defense against the seismic fortification of structures, and the contribution of its bearing capacity and stiffness in the structurecanbeconsidered.However,Luetal.[18]didnot

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EFFECT OF CALCINED PHOSPHOGYPSUM IN PORTLAND

application of concrete and mortars the strength, for casting. The tests were conducted according to IS: 2386 (Part I) 1963 provisions. The sieve analysis and physical properties of fine aggregate is as shown in the table below. Table -2: Physical Properties of fine aggregate S.no Properties Test results IS : 383 1970 1 Water absorption 1.2% <12% 2 Specific gravity 2.702 2.6 2.8 3

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(PDF) Utilisation of phosphogypsum in cement concrete

Engineering properties and construction applications of phosphogypsum. University of Miami press. 1990. (13) Ouyang, C. A, Nanni and W. F. Chang. Internal and external source of sulfate ions in Portland cement mortar: two types of chemical attack. Cement and concrete research. Pergamon Press, U. S. A Vol. 18, 1988. 699 709. 639 (14) Ouyang, C., W. Suaris and W. F. Chang. Effects of sulphate

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Modeling compressive strength of Moroccan fly ash

25/11/2019· Fly ash and phosphogypsum are industrial by-products requiring a cost to get rid of. Their potential use in the synthesis of geopolymer bricks provides great benefits such as the saving use of natural resources and the solid by-product waste management. Compressive strength is the most important parameter for geopolymer bricks design. In this study, two artificial neural networks, namely

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Evolution of mechanical properties of gypsum in time

volume density of phosphogypsum with various gypsum-cement ratios. Tazawa [10] presents the tensile bending strength, compressive strength and the modulus of elasticity for three types of α- and β-gypsum. Acker [11] compares Evolution of mechanical properties of gypsum in time P. Padevět, P. Tesárek, T. Plachý INTERNATIONAL JOURNAL OF MECHANICS Issue 1, Volume 5, 2011 1.

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Gypsum Wikipedia

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO 4 ·2H 2 O. It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster, blackboard/sidewalk chalk, and drywall.A massive fine-grained white or lightly tinted variety of gypsum, called alabaster, has been used for sculpture by many cultures including

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