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Phosphogypsum (PG) is reused as aggregate in the cemented backfill, which efectively improves the PG reutilization eficiency. However, the massive impurities contained in …
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1. Introduction. Phosphogypsum (PG) is a bulk industrial solid waste of wet-process phosphoric acid production. Every ton of phosphoric acid production generates as many as 4–6 tons of PG, including more than 90% of CaSO 4 ·2H 2 O, a small amount of phosphorus, fluorine, organic matter, oxides, heavy metals, radioactive substances …
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Phosphogypsum composition after pretreatment3.1.1. Chemical components. As shown in Table 3 and Fig. 1, the PG without pretreatment contains 0.934 % P 2 O 5. CaHPO 4 ·2H 2 O solid solutions can …
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In-situ remediating phosphogypsum (PG) for cemented paste backfill (CPB) in the contaminated site is economic management for promoting sustainable developments …
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Significant environmental issues are raised by the phosphogypsum (PG) waste that is being produced. In Lithuania, about 1,500,000 tons of PG waste is generated yearly, and about 300 Mt is generated yearly worldwide. A by-product of burning wood biomass in thermal power plants is biomass fly ash (BFA). By 2035, compared to 2008 …
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A new building filling materials (NBFM) using phosphogypsum and municipal solid waste incineration (MSWI) fly ash is prepared in this paper. The effects of MSWI fly ash dosage and MSWI fly ash ...
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When the content of phosphogypsum was 80%, the compressive strength of non-burning building materials after maintenance for 7 days, 28 days and after …
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Phosphogypsum (PG) is a by-product of phosphoric acid production from phosphate rocks, containing radioactive elements and impurities. This review examines …
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A new method of pretreating acidic phosphogypsum (APG) with neutral salt (CaCO 3). CaCO 3 effectively neutralized the residual acid and precipitated impurity in …
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The stacking of phosphogypsum has caused considerable phosphorus pollution in water bodies near phosphogypsum yards through surface runoff and underground infiltration. The phosphate oxygen isotope (δ 18 O p) tracing method has served as a valuable tool for tracing phosphorus pollution in water.However, the existing …
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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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Request PDF | Chemical−Physical Pretreatment of Phosphogypsum Leachate | In landfills for phosphogypsum disposal, a large volume of leachate wastewater generated by the residual process water ...
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Effects of flocculant-modified phosphogypsum on sludge treatment: investigation of the operating parameters, variations of the chemical groups, ... Under pretreatment with 50% DS MPG, Cu-F1 and Cu-F2 increased from 0.33% to 0.48% and from 0.35% to 0.54%, respectively . Accordingly, the content of the other three fractions decreased compared …
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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 effects of citric acid pretreatment on PG defluorination, backfill performance and …
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Florida Gov. Ron DeSantis recently signed a bill that will allow the Florida Department of Transportation to study the use of phosphogypsum in road construction. This came after a longstanding federal-level prohibition on using phosphogypsum, which was repealed by then-President Donald Trump's Environmental Protection Agency (EPA) in October …
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In this study, a water-washing pre-treatment was used to purify OPG, aiming to optimize the transport performance and mechanical properties of backfills. The …
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A new recycling product, the phosphogypsum embedded filler (PGEF) made with calcination-modified phosphogypsum, was developed. The preparation process, …
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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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This study contributes to sustainable construction practices by exploring the use of phosphogypsum, a commonly discarded byproduct, in the production of recycled …
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DOI: 10.1016/j.jenvman.2023.119869 Corpus ID: 266525690; Simplification of the pretreatment method for phosphate oxygen isotope measurement in phosphogypsum leachate. @article{Xie2023SimplificationOT, title={Simplification of the pretreatment method for phosphate oxygen isotope measurement in phosphogypsum …
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Phosphogypsum (PG) accumulation occupies huge amounts of land resources and results in serious environmental risks. A new recycling product, the phosphogypsum embedded filler (PGEF) made with calcination-modified phosphogypsum, was developed. The preparation process, hydration mechanism of …
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1. Introduction. Large amount of sewage sludge generated from the urban waste water treatment plants (WWTP) has had a great impact on the environment due to the defects of sludge in subsequent utilization (Chen, 2013).Meanwhile, transport of bulk sludge has caused serious economic burden because of the higher water content of …
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However, the existing δ 18 O p enrichment and purification methods are complex, costly, and inefficient for phosphate recovery, particularly for phosphogypsum leachate with complex compositions. Herein, a simplified and optimized pretreatment method for δ 18 O p measurement in phosphogypsum leachate was developed. Zirconium/polyvinyl …
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Phosphogypsum is a by-product of phosphoric acid industrial production, and its stacking volume is increasing year by year, which brings a great threat to the environment and agricultural safety. The way of comprehensive utilization of phosphogypsum was described, and the mechanism of phosphogypsum producing cement, preparing …
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XRD analysis was used to determine the crystalline phases of phosphogypsum after pretreatment. The XRD test was measured using a Rigaku Smartlab 9 kW X-ray diffractometer with a copper target and continuous scanning with a step size of 0.02°, scanning range of 5–90°, and speed of 2°/min. The particle size …
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The accumulation of original phosphogypsum (OPG) has occupied considerable land resources, which have induced significant environmental problems worldwide. ... Yong R., Karstensen K.H. Characterization of heavy metals and PCDD/Fs from water-washing pretreatment and a cement kiln co-processing municipal solid …
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The pretreatment of phosphogypsum is mainly to calcine at high temperature, the gradient of an H2O2 ing agent affected the mechanical characteristics of a binary concrete system based on PG ...
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Phosphogypsum is the most significant industrial solid waste in the world. Phosphogypsum has a complex composition and its traditional storage methods occupy large areas of land and also damage the environment. Currently, phosphogypsum is mainly used for the direct preparation of construction materials and chemical auxiliary …
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1. Introduction. Phosphogypsum (PG), as a solid waste generated in the process of the phosphorus fertilizer industry (phosphoric acid production), has an annual global output of 280 million tons, and China's annual output is about 55 million tons [1,2,3].However, most PG is deposited without any treatment near the production sites or stockpiled at the …
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Phosphoric acid manufacturing generates large amounts of phosphogypsum (PG); a by-product generally disposed in the surface or evacuated in the seawater without any pretreatment. Phosphogypsum may host non-negligible amounts of valuable elements such as rare earth elements (REEs), which are critical elements on …
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