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Phosphogypsum is usually a yellowish-white, light greyish-white or dark grey fine powdery solid. The main component of PG is CaSO 4 ·2H 2 O, which accounts for more than 90% of its total composition. In addition, PG contains phosphorus, fluorine, organic matters and other impurities (e.g. heavy metal elements and nuclides) (Rashad, …
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Phosphogypsum (PG) is a by-product generated from the phosphorus fertilizer industry (phosphoric acid production). PG is similar to natural gypsum, but there are some differences, of which it contains some impurities such as water-soluble phosphate (P 2 O 5), water-soluble fluoride (F −) and P 2 O 5 substituted in the gypsum crystal …
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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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"EPA requires that phosphogypsum be managed in above-ground stacks, which are designed to keep emissions of radon and other radionuclides in line with acceptable …
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At present, the utilization rate of phosphogypsum in China is still relatively low, 2010-2020 China's phosphogypsum annual production and utilization rate as shown in Figure 2, 2010-2020 China's ...
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Phosphogypsum (PG) is a by-product of phosphate fertilizer production that contains radioactive and hazardous elements. This review evaluates the geochemical and radiological risks of PG and its nanoparticles (NPs) in different uses and environments.
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The addition of phosphogypsum and superphosphate drastically reduced CH4 emissions (by 85.8% and 80.5%, respectively) and decreased NH3 emissions (by 23.5% and 18.9%, respectively).
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The regulations require that phosphogypsum be managed in engineered stacks, which are designed to limit public exposure from emissions of radon and other radionuclides. Owners and operators must monitor and report radon emissions from inactive stacks and take measures to keep radon emissions within the regulatory limit …
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The problem of recycling and storage of phosphogypsum is topical for many countries around the world, as it is associated with environmental problems of pollution …
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Industrial wastes: Fly ash, steel slag and phosphogypsum- potential candidates to mitigate greenhouse gas emissions from paddy fields Chemosphere. 2020 Feb;241:124824. doi: ... associated with the application of FA, SS, and PG onto the paddy fields and their impacts on methane and nitrous oxide emissions are highly fragmented …
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This article reviews the physical-chemical properties and environmental impacts of phosphogypsum (PG), a byproduct from phosphate fertilizer production. It …
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Phosphogypsum is a by-product from the production of phosphoric acid. In this process, the raw phosphate is treated by sulfuric acid and, besides the main product which is phosphoric acid (H3PO4), gypsum and a small quantity of hydrofluoric acid are obtained. For every tonne of phosphoric acid made, about three tonnes of phosphogypsum …
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It was reported by Hao et al. (2005) that phosphogypsum, the main by-product of phosphoric acid production, might be effective in reducing CH 4 emissions during cattle manure composting by increasing SO 4 2− content of the compost, and Luo et al. (2013) indicated that the addition of phosphogypsum at a rate of 10% of total …
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The plant will use sulfur for the calcination of phosphogypsum and include technologies for CO 2 capturing with lime produced from the calcination. The process will lead to a reduction in CO 2 emissions across Ma'aden's phosphate business, making it more sustainable in the long term. Ma'aden's patented concept will allow the company to ...
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Phosphogypsum (PG) is a by-product of the phosphate fertilizer industry that is produced during the phosphoric acid production process. Annual global PG production ranges between 100 to 300 Mt ...
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Phosphogypsum (PG) is a solid waste produced from decomposition of phosphate rock in sulfuric acid. ... which showed that PG treatment could inhibit the emission of greenhouse gas in wheat soil ...
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As a result, domestically produced phosphogypsum is stored in "stacks" all over the country – massive containment ponds where phosphogypsum is indefinitely piled. The International Atomic Energy Agency ( IAEA ) estimates that each year, 40 million tons of the waste are added to stacks in the US, and about 90 million tons annually outside ...
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Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. ... Standards and regulations: The restrictions on PG recycling vary depending on the country and the approach adopted. ... Exhalation of Rn-222 and emission of F (gas), emission of dust; (2) Direct incorporation of trace …
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Phosphogypsum Stacks." The rule limits radon emissions from phosphogypsum stacks and requires disposal of phosphogypsum in stacks or piles, with exceptions for agricultural and research uses and other uses on a case-by-case basis. Applying to EPA for Approval of Other Uses of Phosphogypsum: Submitting a Complete Petition 1.0 Introduction
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Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H 3 PO 4) manufacturing during phosphate rock decomposition.Worldwide, the annual production of PG ranges between 100 and 300 million tons, with only a few quantities utilized in several application domains (about 15%), the …
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The combination of dicyandiamide and phosphogypsum exhibited the most pronounced emission reduction effect, simultaneously decreasing the NH 3, CH 4 and N 2 O emissions by 18.28 %, 38.58 % and 36.14 %, respectively. The temperature and C/N content of the compost were significantly positively correlated with greenhouse gas …
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Phosphogypsum (PG), a hard-to-dissipate by-product of the phosphorus fertilizer production industry, places strain on the biogeochemical cycles and ecosystem functions of storage sites. This pervasive problem is already widespread worldwide and requires careful stewardship. In this study, we review the presence of potentially toxic …
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Phosphogypsum and superphosphate had no negative effects on compost maturity, although superphosphate inhibited the temperature rise in the first few days. The addition of phosphogypsum and superphosphate drastically reduced CH4 emissions (by 85.8% and 80.5%, respectively) and decreased NH3 emissions (by 23.5% and 18.9%, respectively).
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Subpart R: National Emission Standards for Radon Emissions from Phosphogypsum Stacks This webpage has information about 40 CFR Part 61, Subpart R, a rule that protects people and the environment from the radon given off by phosphogypsum stacks. The States. Some states have worked with the EPA to write …
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This report is addressing rapidly changing scientific, regulatory and policy perspectives concerning phosphogypsum (PG) management and use worldwide. It has been authored and reviewed by many of the world's top experts on PG from academia, international agencies and representatives of IFA's own member companies. The report …
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You find consumption-based emissions later in this country profile. These figures look specifically at CO 2 emissions – not total greenhouse gas emissions. You find total, and other greenhouse gas emissions, later in this country profile. Annual emissions can be largely influenced by population size – we present the per capita figures above.
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Phosphogypsum (PG) is a waste (or by-product) of the production of phosphoric acid, a basic constituent in the manufacturing of modern fertilizers. ... In addition, this study shows that the radioactive emission of the components of this brick is below the limit values recommended by the standards, and therefore its use is safe. …
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While it remains debated if mineral deposits mined for phosphorus fertilizer are running out, phosphorus insecurity is an emerging global issue. We explore how it …
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The degradation of organic matter (OM) and CH 4 emissions during composting greatly influence the composting efficiency and greenhouse effect. This study evaluated the effects of adding phosphogypsum (PPG) and medical stone (MS) on OM breakdown, CH 4 emissions, and their underlying mechanisms. MS accelerated the …
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Request PDF | On Jan 1, 2022, Yan Yang and others published Effects of Dicyandiamide, Phosphogypsum, and Superphosphate on Greenhouse Gas Emissions During Pig Manure Composting | Find, read and ...
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