The high concentration of fluoride and phosphate in phosphogypsum leachate is harmful to the environment and ecosystem. Thus, there is a need to develop feasible materials or technologies to remove both fluoride and phosphate in acidic phosphogypsum leachate. In this study, sulfoaluminate cement (SC) was used to simultaneously remove fluoride and phosphate in …
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Research has proved that the use of modified materials can not only effectively reduce the soluble phosphorus and F-content in PG, but also promote the hydration reaction. ... Control of fluoride pollution in cemented phosphogypsum backfill by citric acid pretreatment. Materials (2023) S. Zhou et al.
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Introduction Phosphogypsum is an industrial by-product of the phosphatic fertilizer industry that has received attention because of its acidity, fluoride content, heavy metal content and low level radioactivity (Rutherford et al. 1994).
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Second, compared to the P—phosphor element, the content of F—fluoride in phosphogypsum is relatively low. Existing data show that the P/F mass ratio usually fluctuates between 0.7 and 9, indicating significant regional differences in the samples. Meanwhile, the technical difficulty of removing relatively low concentrations of F elements ...
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Phosphogypsum, a typical by-product in wet process phosphoric acid with enormous production and high content of phosphorus and fluorine, can offer significant possibilities as a second resource. Thus, developing green and effective technologies for removing and recycling phosphate and fluoride from phosphogypsum leachate is greatly important ...
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Research has proved that the use of modified materials can not only effectively reduce the soluble phosphorus and F-content in PG, but also promote the hydration reaction. ... Control of fluoride pollution in cemented phosphogypsum backfill by citric acid pretreatment. Materials, 16 (19) (2023), 10.3390/ma16196493. Google Scholar [13]
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Phosphogypsum, a typical by-product in the phosphorus chemical industry, could generate a large amount of leachate containing phosphate and fluoride in the process of …
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Phosphogypsum (PG)-based cemented paste backfill (PCPB) is a promising avenue for the large-scale disposal of PG. However, the toxicity and low strength of PCPB …
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The fluoride was tested by a fluoride ion detector (PF-202, INESA Scientific Instrument Co., Ltd, Shanghai, China) with a detection limit from 10 −1 to 10 −6 mol/L. To eliminate the influence of fluoro complex, sodium acetate (CH 3 COONa) or HCl was applied to modify the pH values of leachates from 5 to 7. The remained residues after ...
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The thermal treatment method involves the transformation or decomposition of fluorides in phosphogypsum under high-temperature conditions, thereby reducing the fluorine content in phosphogypsum and subsequently mitigating the impact of fluorine on its properties.
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Phosphogypsum (PG) is a type of synthetic gypsum generated during the production of phosphoric acid. ... cadmium, chromium, fluoride, zinc, antimony, copper (U.S. Environmental Protection Agency, 1990), which may ... to the annual effective dose due to airborne contamination from phosphogypsum wallboard with enhanced radium content used as an ...
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This review comprehensively explores fluoride removal from phosphogypsum, focusing on its composition, fluorine-containing compounds, characterization methods, and …
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The MP-BC exhibited 133 mg/g maximum fluoride adsorption capacity, and the adsorption rate of fluoride in actual phosphogypsum leachate by MP-BC can reach 97.23%. …
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The modified phosphogypsum biochar (MP-BC) was prepared by mixing the modified phosphogypsum (MPG) with pineapple peel in proportion and applied to the removal of fluoride from wastewater.
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Phosphogypsum is the principal by-product produced by the wet processes involved in the manufacture of phosphoric acid, and generally contains an amount of fluoride that needs to be fixed or removed.
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Phosphogypsum (PG) is a solid waste generated during the wet production of phosphoric acid, noted for causing significant environmental pollution due to low pH and …
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Phosphogypsum, a typical by-product in the phosphorus chemical industry, could generate a large amount of leachate containing phosphate and fluoride in the process of rainfall and long-term …
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Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded irresponsibly, leading to …
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The high concentration of fluoride and phosphate in phosphogypsum leachate is harmful to the environment and ecosystem. ... To sum up, ASC is a competitive candidate to treat wastewater with high fluoride and phosphate content, such as phosphogypsum leachate. Graphical abstract. Download: Download high-res image (331KB) Download: Download full ...
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The efficiency of La-ZFA was basically not affected by the high concentration sulfate, and it can selectively adsorb fluoride from phosphogypsum leachate, leading to a final fluoride concentration of 0.29 mg/L in the effluent. The characterization demonstrated that fluoride might be adsorbed onto the La-ZFA via ligand exchange with hydroxy groups.
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Using phosphogypsum (PG) as the aggregate of cemented backfill is an economical and effective method of PG utilization. However, the stability and performance of cemented backfill are …
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In this present paper, the main existence form and phase distribution of trace fluoride in phosphogypsum was investigated by the combination of X-ray photoelectron spectroscopy …
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This study discusses fluoride removal efficiency from phosphogypsum (PG) on lab-scale experiment matrix designed by Box-Behnken method. Temperature, solid/liquid ratio, and time were introduced as ...
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Using phosphogypsum (PG) as the aggregate of cemented backfill is an economical and effective method of PG utilization. However, the stability and performance of cemented backfill are challenged by the rich fluoride content in PG. In this study, the ...
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The results showed that the citric acid pretreatment could significantly reduce the fluoride content in PG and promote the hydration reaction with the binder, thus greatly reducing the usage and ...
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The resource utilization of phosphogypsum is confronted with great challenge. Of all the different methods for phosphogypsum resource utilization, using phosphocypsum to fabricate calcium fluoride (CaF 2 ) is an effective resource utilization method. In this work, high-quality nano-calcium fluoride was successfully prepared in aqueous solution using calcined phosphogypsum by …
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Soil fluoride pollution due to small and large scale industrial plants and phosphogypsum (PG) as a by-product of a chemical fertilizer production plant (CFPP) in Bandırma district in Turkey was ...
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Phosphogypsum is waste with the main component CaSO 4 ·2H 2 O (90% calculated as dry mass), but containing a variety of impurities of phosphate rock origin. Among the impurities, the most significant concern is the high fluorine content (0.3–1.8%), which restricts the application of this waste product.
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Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 224,403,091 papers from all fields of science ... {Highly efficient recovery of phosphate and fluoride from phosphogypsum leachate: Selective precipitation and adsorption.}, author={Mengxuan Zhao and Xiaodi Li and Junxia Yu and Fei Li and Li Guo and ...
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Phosphogypsum (PG) is a solid waste generated during the wet process of phosphoric acid, the utilization of which is hindered by impurities.Herein, natural gypsum and limestone were replaced by PG as the only source of CaO for the production of sulfoaluminate cement (SAC). The effects of fluoride impurities such as NaF, CaF 2, and Na 2 SiF 6 on the …
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