phosphogypsum modified with lime in Oman
Phosphogypsum production and utilization in China
Eco - concrete made with phosphogypsum-based super sulfated cement; Effect of curing temperature and particle size distribution on unconfined compressive strength of raw and treated fly ash-lime modified phosphogypsum waste; Optimization of non-autoclaved aerated concrete using phosphogypsum of industrial waste based on …
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Formulation and optimization of a phosphogypsum – fly ash – lime
This paper investigates the valorization of phosphogypsum and fly ash by-products as a road construction material through lime stabilization. To this end, an extreme vertices design was adopted to model the compaction characteristics, mechanical performance at different curing periods and durability upon wetting/drying (W/D) cycles …
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Plasticity, Swell‐Shrink, and Microstructure of …
The study involved utilization of an industrial waste, Phosphogypsum (PG), as an additive to lime stabilization of an expansive soil. Three lime dosages, namely, initial …
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(PDF) Cross-Scale Study on Lime Modified Phosphogypsum …
In this paper, based on the mechanical tests on lime modified phosphogypsum cemented backfill (LMPGCB), the microstructure of the LMPGCB sample was characterized by nuclear magnetic resonance (NMR ...
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Valorization of phosphogypsum as a road material: Stabilizing effect of
A ternary system of phosphogypsum (PG), fly ash (FA) and lime (L) has been investigated in the present study. The phosphogypsum sample was freshly collected from the phosphoric acid plant located at Jorf Lasfar, El Jadida, Morocco. Its average water content and pH are in the order of 27% and 3.45, respectively.
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Investigation on Engineering Characteristics of Lime …
AbstractPhosphogypsum, which contains toxic components (e.g.,heavy metal elements and fluoride), is one of the byproducts of phosphoric …
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Utilizing expansive soil treated with phosphogypsum and lime …
2.1.3. Lime. In this investigation, hydrated lime (Ca(OH) 2) was employed to treat expansive soil due to its well-documented effectiveness in treating expansive soils.When hydrated lime is introduced to soil, it interacts with clay particles, producing chemical and physical reactions that enhance the soil properties [4].Lime can increase …
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Investigation on Engineering Characteristics of Lime …
AbstractPhosphogypsum, which contains toxic components (e.g.,heavy metal elements and fluoride), is one of the byproducts of phosphoric acid production, and filling subgrade is one of the recycling methods for it. In this study, phosphogypsum was ...
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Minerals | Free Full-Text | Cross-Scale Study on Lime Modified …
The authors are congratulated for the document "Cross-scale study on lime modified phosphogypsum cemented backfill by fractal theory", it has good structure, as well as in the fulfillment of the objectives, references, and the practical approach on the analysis and methodology of samples based on the fractal theory, however, the only …
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Investigation of phosphogypsum-based cementitious …
Lime-modified phosphogypsum can reduce the impact of impurities (such as P 2 O 5, F −) and shorten the setting time.. The OH − released by the dissolution of lime can accelerate the dissolution of slag powder and promote the hydration reaction.. After phosphogypsum is modified by lime, the porosity of the phosphogypsum-based …
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Phosphogypsum: Properties and Potential Use in Agriculture
Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled. Phosphogypsum is valued in several sectors: road construction,...
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Mechanical properties and micro-mechanism of improved …
DOI: 10.1016/j.conbuildmat.2023.134437 Corpus ID: 266295012; Mechanical properties and micro-mechanism of improved shield tunnel muck with phosphogypsum and lime @article{Jiao2024MechanicalPA, title={Mechanical properties and micro-mechanism of improved shield tunnel muck with phosphogypsum and lime}, …
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Experimental Study on the Road Performance of …
Phosphogypsum-Modified Lime-Fly Ash Stabilized Red Clay Shibin Huang 1,2, Yanzhou Ma 1,2, Jiaquan Wang 1,2,*, Zhinan Lin 1,2 and Tianxin Chen 1,2
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Mechanical properties and micro-mechanism of improved …
Lime and phosphogypsum (PG) were used to improve properties of the tunnel muck. The phosphogypsum (PG) was obtained from a phosphate fertilizer plant in Nanjing. ... Effect of modified phosphogypsum on the hydration properties of the phosphogypsum-based supersulfated cement. Constr. Build. Mater., 214 (2019), pp. 9 …
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Experimental Study on the Road Performance of High …
Mix Proportion Design. Some scholars had conducted in-depth research on the mixing proportion of PG-modified lime mixture. Ghosh (2010) suggested that the …
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Geotechnical Properties and Application of …
To this end, mixtures of phosphogypsum and fly ash were prepared then activated with varying quicklime additions (beyond Initial Consumption of Lime) to develop different combinations of ...
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Applied Sciences | Free Full-Text | Experimental Study on the …
AMA Style. Huang S, Ma Y, Wang J, Lin Z, Chen T. Experimental Study on the Road Performance of Phosphogypsum-Modified Lime-Fly Ash Stabilized Red Clay.
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Phosphogypsum impacts on soil chemical properties and
Phosphogypsum (PG) is a by-product of phosphorus fertilizer that is typically stacked near production sites. Phosphogypsum contains trace elements and naturally occurring radioactive materials which may be hazardous to the surrounding environment. Phosphogypsum stack reclamation typically involves placing a soil cap …
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A review on the environmental impact of phosphogypsum and …
The phosphogypsum valorization became a necessity when the U.S. Environmental Protection Agency (EPA) legislation was modified in 1992 and allowed the use of PG with an average 226 Ra of less than 370 Bq/kg for agricultural applications such as a soil amendment. Other areas in the world, however, looked at PG as a valuable raw …
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Study on lime–fly ash–phosphogypsum binder
The chemical compositions of phosphogypsum, fly-ash, quick lime, slaked lime and modified lime were given in Table 1, those materials were used as raw materials for making lime–fly ash–phsphogypsum binder.The modified lime (stabilizer) was manufactured by blending quick lime with 10% of additives and grinding together in a ∅ …
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Effect of Modified Phosphogypsum on Properties of …
Using lime neutralization to pretreat PG, the pH value, mortar consistency and setting time, activation index, and physical properties as well as the Fourier transform infrared spectroscopy and ...
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Investigation of phosphogypsum-based cementitious …
Lime-modified phosphogypsum can reduce the impact of impurities (such as P 2 O 5, F −) and shorten the setting time.. The OH − released by the dissolution of lime …
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Phosphogypsum circular economy considerations: A critical …
Nearly 300 million t of phosphogypsum (PG) are produced every year as a byproduct from phosphate fertilizer production worldwide. Approximately 58% of the PG are stacked, 28% are discharged in coastal waters and only 14% are further processed. This critical review provides an overview of the physical-chemical properties of PG produced …
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Geotechnical Properties and Application of Lime Modified Phosphogypsum
In this study, mild acid treated residual phosphogypsum was stabilized with Lime Fly Ash (LFA) binder, and the geotechnical properties and changes in phosphogypsum radioactivity were evaluated. Part of the LFA binder were replaced with basic oxygen slag (BOG) and the properties of the LFA-BOG composite were also evaluated.
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A Novel Process to Recover Gypsum from Phosphogypsum
In this study, we investigated a coarse phosphogypsum containing 49.63% SO3, 41.41% CaO, 10.68%, 4.47% SiO2, 1.28% P2O5, 0.11% F, CaSO4·2H2O purity of 80.65%, and whiteness of 27.68. Phosphogypsum contains calcium sulfate dehydrate as the main mineral, with small amounts of brushite, quartz, muscovite, and zoisite. Harmful …
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The Influence Mechanism of Molar Ratio on the Performance …
Comprising a relatively large amount of industrial solid waste, the high-value utilization of phosphogypsum (PG) is closely related to the sustainable development of resource materials and the protection of the ecological environment. PG can improve some of the shortcomings of geopolymers, but there is a lack of systematic research on the …
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Investigation on Engineering Characteristics of Lime …
DOI: 10.1061/jmcee7.mteng-16617 Corpus ID: 267221092; Investigation on Engineering Characteristics of Lime-Stabilized Phosphogypsum Subgrade Filler @article{Chen2024InvestigationOE, title={Investigation on Engineering Characteristics of Lime-Stabilized Phosphogypsum Subgrade Filler}, author={Yun Chen and Xiaoping Ji …
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Highly Efficient Removal of Congo Red from Aqueous Solution by Lime
Phosphogypsum (PG) modified by milk of lime (namely lime-preconditioned phosphogypsum, PPG) is investigated to evaluate the adsorption thereof for removing Congo Red (CR) from aqueous solution. The experimental parameters, such as adsorbent dosage, pH, adsorption temperature, initial CR concentration and contact …
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Highly Efficient Removal of Congo Red from Aqueous Solution by Lime
Phosphogypsum (PG) modified by milk of lime (namely lime‐preconditioned phosphogypsum, PPG) is investigated to evaluate the adsorption thereof for removing Congo Red (CR) from aqueous solution.
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