The phosphogypsum is a by-product of the phosphate fertilizer industry. It has accumulated over several decades, and not only takes up a large amount of land, but also poses a significant risk to the environment and resource waste. In order to promote the use of phosphogypsum, its hydration hardening characteristics are studied using a …
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 …
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 ...
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 ∅ …
To assess the impact of solid waste phosphogypsum on the road performance of lime-fly ash-stabilized red clay, we conducted comprehensive tests on …
The results revealed that the combined use of phosphogypsum and modified cotton stalk biochar (T10) significantly enhanced soil organic carbon (SOC) by 73.66% and 99.46% in both seasons, the soil available N both seasons by 130.12 and 161.45%, the available P by 89.49% and 102.02%, and the available K by 39.84 and …
DOI: 10.1007/s43452-024-00933-6 Corpus ID: 269114202; Highly efficient modified phosphogypsum building gypsum powder and environmentally friendly utilisation in self-levelling mortar
Phosphogypsum (PG), produced from phosphoric acid production, consists mainly of CaSO 4 ·2H 2 O and some impurities such as P 2 O 5, F −, and organic substances.Many phosphate fertilizer-producing countries face problems of PG waste with the high waste yield (5 kg PG generated 1 kg of phosphoric acid produced) [].The …
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 ...
Geotechnical Properties and Application of Lim e Modified Phosphogypsum Waste. Tebogo MASHIFANA 1, 2, Felix Ndubisi OKONTA 1, Freeman NTULI 2. 1 Department of Civil Engineering Sciences ...
Pore structure is a critical factor affecting the strength characteristics of mine backfill materials. In this paper, based on the mechanical tests 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 …
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 …
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 …
The phosphogypsum morphology modified by DG and PVA makes a smaller bulk density and a larger porosity of the filter cake. Our work shows that the modified morphologies by DG and PVA enhance the filtration strength of phosphogypsum, and the enhanced filtration strength would reduce the water content …
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
The study involved the utilization of an industrial waste product, Phosphogypsum (PG) as an additive to lime for the stabilization of soil. Three lime dosages, viz. initial consumption of lime (ICL), optimum lime content (OLC) and less than ICL (LICL) were adopted for stabilizing the soil. The study investigated the stress-strain …
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 …
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 …
Stabilized with Lime and Phosphogypsum Ambarish Ghosh1 Abstract: Recycling of waste material is one of the effective solutions of its disposal problem. Fly ash produced by coal-based thermal
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.
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 …
1. Introduction. Supersulfated cement (SSC) is a kind of environment-friendly cement as well as a newly developed non-burnt cementitious material with less clinker or even without clinker [1], [2].The common compositions of SSC are always about 75–85% ground granulated blast furnace slag (slag), 10–20% gypsum as sulfate activator, and …
AbstractPhosphogypsum, which contains toxic components (e.g.,heavy metal elements and fluoride), is one of the byproducts of phosphoric …
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 …
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 ...
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 …
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 …
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 …
