The Impurity Removal and Comprehensive Utilization of Phosphogypsum: A Review

Materials, Год журнала: 2024, Номер 17(9), С. 2067 - 2067

Опубликована: Апрель 28, 2024

Phosphogypsum (PG), a byproduct during the phosphoric acid production process, also known as wet contains complex and diverse impurities, resulting in low utilization considerable accumulation. This leads to massive waste of land resources series environmental pollution problems. Given current urgent ecological situation, developing impurity removal processes with energy consumption high efficiency, exploring valuable resource recovery, preparing value-added PG products, broadening comprehensive ways are significant strategies promote sustainable development phosphorus chemical industry. review comprehensively summarizes advantages disadvantages existing technologies probes into future direction, which provides references ideas for subsequent research.

Язык: Английский

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Mechanical Characteristics and Microstructural Changes in Phosphogypsum-Cement-Lime Composite Modified Loess

Опубликована: Янв. 1, 2024

Язык: Английский

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Possibility of Using Alkali-Activated Phosphogypsum from the Production of Orthophosphoric Acid for the Building Materials—A Review

Processes, Год журнала: 2025, Номер 13(1), С. 97 - 97

Опубликована: Янв. 3, 2025

This paper focuses on the possibility of using phosphogypsum, which is a residue from production orthophosphoric acid as an additional source calcium and use spent caustic alkaline activator for ceramic materials in construction industry. The above-mentioned waste will allow to increase fraction calcium, sodium silicate needed geopolymerization process improve properties material. review presents description influence reactions occurring materials. Collected information, confirm post-production chemical industry components building

Язык: Английский

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Preparation of phosphogypsum ecological concrete and study on its phytogenic properties

Frontiers in Environmental Science, Год журнала: 2025, Номер 12

Опубликована: Янв. 9, 2025

In this study, vegetative eco-concrete was prepared based on electrolytic manganese slag/phosphogypsum composite cementitious material as binder and clayey ceramic grains aggregate. Based the conditions of porosity water-cement ratio, optimal proportion phosphogypsum-based investigated, concrete specimens with good performance were (14 days compressive strength: 3.49 MPa, permeability coefficient: 1.37, total porosity: 24.5%, Improved strength by 15% water retention 20%). The nutrient matrix different phosphogypsum/electrolytic slag ratios designed modified, investigated using four-season grass, ryegrass, clippings clover grass species. results showed that phosphogypsum raw rich in nutrients such nitrogen, phosphorus potassium, which could meet requirements plant growth, Supporting growth a 30% increase root length 25% improvement biomass compared to control concrete. addition improvers had passivation effect heavy metals As, Cu, Cr, Zn, Sb Pb phytogenic substrate. adaptability species planting substrate Four Seasons > ryegrass shepherd’s purse clover, alfalfa, dogbane; application best planting, improver inhibited plants. study addresses challenge concrete, has traditionally faced issues stability. By optimizing mix ratio curing process, we able achieve not only performs well mechanically but also supports growth.

Язык: Английский

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Chemical Mechanisms of Cement Stabilization and Durability Enhancement in High-Content Modified Phosphogypsum

Buildings, Год журнала: 2025, Номер 15(5), С. 723 - 723

Опубликована: Фев. 24, 2025

Phosphogypsum, a byproduct of phosphate fertilizer production, accumulates in large quantities annually, posing significant environmental challenges due to harmful components such as fluorine, heavy metals, and acidic salts. To mitigate these issues, phosphogypsum is often combined with cement single modifiers sodium silicate, hydrated lime, defluorinating agents for use pavement applications. However, concerns about the durability unmodified or singly modified high-content have hindered its widespread adoption. address this issue, study explored composite enhance cement-stabilized phosphogypsum. The mechanisms modification by individual additives were investigated using X-ray diffraction (XRD) scanning electron microscopy (SEM). Durability was evaluated through three-point bending fatigue, freeze–thaw, drying shrinkage tests on both results demonstrated that significantly improved material’s density, strength, stability enhancing hydration products stabilizing fluoride ions. material exhibited superior fatigue freeze–thaw resistance, reduced mass loss slower strength decline compared Additionally, showed performance enhanced hydration. caution recommended when materials regions high moisture content temperature fluctuations.

Язык: Английский

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An advanced image processing and multivariate statistical methodology to interpret Micro-EDXRF 2D maps: Uncovering heterogeneity and spatial distribution patterns of rare earth elements in phosphogypsum

Chemosphere, Год журнала: 2025, Номер 381, С. 144478 - 144478

Опубликована: Май 13, 2025

Язык: Английский

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Preparation of high‐strength gypsum by crystal regulation of phosphogypsum in nitrate solution

Journal of the American Ceramic Society, Год журнала: 2025, Номер unknown

Опубликована: Май 19, 2025

Abstract Phosphogypsum (PG) suffers from impurities and low resource utilization, posing significant environmental challenges negatively impacting the phosphorus chemical industry. Herein, technique that combines flotation for PG purification with conversion of purified into high‐strength gypsum using a magnesium nitrate (Mg(NO 3 ) 2 solution under atmospheric conditions was investigated. A “reverse‐direct” successfully removed organic matter quartz PG, making it be an ideal secondary resource. The achieved whiteness 55.4%, CaSO 4 ·2H O content 96.57%, meeting specifications first‐grade outlined in GB/T 23456‐2018 standard. Mg(NO found to facilitate glutaric acid (GA) modified morphology gypsum. optimum excellent mechanical property were conducted at temperature—85°C, fraction—15 wt%, concentration—30 resulting average length 28.6 µm aspect ratio 2.0. mechanism GA selective adsorbed on end faces hemihydrate gypsum, inhibiting crystal growth along c ‐axis. By supplementing appropriate amounts each cycle, sustainable recycling filtrate achieved. Such technology enables clean production high‐value utilization PG.

Язык: Английский

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Hydration mechanism and mechanical properties of slag-phosphogypsum solid waste-based cementitious composite incorporated silica fume

Construction and Building Materials, Год журнала: 2025, Номер 485, С. 141923 - 141923

Опубликована: Май 23, 2025

Язык: Английский

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Compressive performance of CFST columns with in-built cast-in-place phosphogypsum-filled FRP tubes

Journal of Constructional Steel Research, Год журнала: 2025, Номер 233, С. 109677 - 109677

Опубликована: Июнь 2, 2025

Язык: Английский

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Development of phosphogypsum-based full-solid-waste cementitious materials: Mechanical properties, hydration mechanisms, and pollutant stabilization mechanisms

Journal of Building Engineering, Год журнала: 2025, Номер unknown, С. 113100 - 113100

Опубликована: Июнь 1, 2025

Язык: Английский

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