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Properties, Purification, and Applications of Phosphogypsum: A

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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Waste controls waste: fluoride adsorption behavior and

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%. ... An X-ray fluorescence spectrometer (XRF, ZSX Primus III +, Japan) was used to measure the component elements and content in materials. A fully automatic specific surface area ...

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Control of Fluoride Pollution in Cemented Phosphogypsum …

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 effects of citric acid pretreatment on PG defluorination, backfill performance and environmental behavior …

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Assessing Fluoride Impact in Phosphogypsum: Strength and

This study investigates the impact of initial fluoride content (IFC) in PG samples on the strength and leaching behavior of PCPB to establish appropriate pretreatment standards. …

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Enhanced immobilization of fluoride in phosphogypsum-based …

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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Preparing sulfoaluminate cement using phosphogypsum as the …

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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Efficient removal of phosphate and fluoride from phosphogypsum …

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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Radioactivity and elemental composition of phosphogypsum produced …

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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Phosphogypsum-Modified Vinasse Shell Biochar as a Novel Low …

1. Introduction. The effect of fluoride in water on human health is related to its concentration. The normal growth of bones and teeth requires a certain concentration of fluoride intake (0.4 to 1.5 mg/L) [].However, drinking water with high levels of fluoride (above 1.5 mg/L) can cause many health problems, such as teeth mottling, skeletal fluorosis, and even changes in …

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A Review of Fluoride Removal from Phosphorous Gypsum: A

This review comprehensively explores fluoride removal from phosphogypsum, focusing on its composition, fluorine-containing compounds, characterization methods, and …

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Preparation of Calcium Fluoride using Phosphogypsum by …

Abstract: The resource utilization of phosphogypsum is confronted with great challenge. Of all the different methods for phosphogypsum resource utilization, using phosphogypsum to fabricate calcium fluoride (CaF 2) is an effective resource utilization method. In this work, high-quality nano-calcium fluoride was successfully prepared

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Highly efficient recovery of phosphate and fluoride from phosphogypsum

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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Control of Fluoride Pollution in Cemented Phosphogypsum …

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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Waste controls waste: fluoride adsorption behavior and

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%. Furthermore, chemical precipitation was the primary adsorption mechanism. Also, the MP-BC can effectively promote fluoride ion conversion into calcium fluoride.

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Highly efficient recovery of phosphate and fluoride from …

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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Effectiveness of capacitive deionization for the removal of soluble

Our results exhibit that the contents of soluble phosphorus and fluoride ions in phosphogypsum washed with circulating water are 0.017 % and 0.006 % respectively, which reach the Chinese national standard. ... The content of soluble ions are found to be 0.017 % and 0.006 % for fluoride ions and PG ions respectively. Download: Download high-res ...

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Leaching Characteristics and Mechanisms of Fluorine and

Phosphogypsum (PG) is a major industrial solid waste generated during wet-process phosphoric acid production [1,2,3].Globally, the annual production of PG is estimated to be approximately 300 million tons [4,5], making it one of the largest sources of newly generated industrial solid waste [].In contrast to countries, like Japan and Germany, where gypsum …

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Enhanced strength and fluoride ion solidification/stabilization

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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Fluoride removal from phosphogypsum: A study on pre-industrial …

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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Highly-efficient fluoride retention in on-site solidification

Phosphogypsum (PG) is an industrial solid waste inevitably generated from the wet process of phosphoric acid production (Cai et al., 2021; Ennaciri et al., 2020).Based on previous statistics, the overall utilization rate of PG is only 15%, representing that the majority of PG is stockpiled in the ground and without any type of isolation (Zhang et al., 2012a).

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Effectiveness of capacitive deionization for the removal of soluble

Our results exhibit that the contents of soluble phosphorus and fluoride ions in phosphogypsum washed with circulating water are 0.017 % and 0.006 % respectively, which reach the Chinese national standard. Meanwhile, the washing water can be used again for washing PG after CDI treatment, so as to achieve the purpose of water recycling and water ...

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Removal of fluoride ions from wastewater via simple low …

Phosphogypsum (PG) is an industrial waste residue produced during the wet process of phosphoric acid production in the phosphorus chemical industry. ... [34], reducing the dissolved Ca 2+ content and fluoride removal efficiency of the PG. Therefore, maintaining a relatively low solution temperature (20 ℃) is beneficial for fluoride ions removal.

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Enhanced strength and fluoride ion solidification/stabilization

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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Preparing sulfoaluminate cement using phosphogypsum as the …

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). ... Results show that with increasing fluoride content, the ...

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[Spectral Analysis of Trace Fluorine Phase in Phosphogypsum]

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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The effect of phosphogypsum as the mineral feed additive on fluorine

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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Simultaneous and efficient removal of fluoride and phosphate in

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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Phosphogypsum Conversion into Calcium Fluoride and Sodium …

phosphogypsum, sodium fluoride, calcium fluoride, sodium sulfate, wet conversion. 1. Introduction. Phosphogypsum (PG) is an acidic by-product resulted during the production of phosphoric acid by the wet process. This latter can be expressed by the following chemical reaction [1]: ... Generally, the content of these impurities is similar to that ...

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Preparation of Calcium Fluoride using Phosphogypsum by Orthogonal

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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Highly efficient recovery of phosphate and fluoride from phosphogypsum

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 stacking, which not only causes serious environmental pollution, but also leads to a waste of resources. In this study, a united treatment of calcium hydroxide precipitation and lanthanum …

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