The effect of phosphogypsum concentration, carbon and nitrogen sources, temperature, pH and stirring on the growth of sulfate-reducing bacteria was investigated.
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Phosphogypsum has also been identified as a potential source of rare earth elements, and improved extraction methods are being investigated which include …
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Oman sitting pretty. Oman will emerge as the single most important source for high grade natural gypsum for cement and gypsum board manufacturers across Asia and South and East Africa by 2020. The country has estimated gypsum resources of over 1000Mt but the potential for domestic value-addition of gypsum is extremely limited.
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The most active community of Sulphate-reducing bacteria was isolated from soil contaminated with industrial petroleum-refining wastewaters in culture Postgate with Phosphogypsum as source of ...
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The elemental and radioactive characterizations of phosphogypsum and the phosphate rock used as raw material in industries A and C are presented in Table 1, Table 2, Table 3.Although the origin of the two rocks is the same, both are extracted from do Catalão I carbonatite complex, located in central Brazil, their composition is slightly …
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This study demonstrates the feasibility of using phosphogypsum as the sole CaO source in the preparation of calcium sulfoaluminate cement by considering its mechanical properties and the potential ...
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Oman: Producers and exporters despatched 9.9Mt of gypsum from Oman in 2022. The figure corresponds to year-on-year growth of 13% from 8.74Mt in 2021. ... The Indian cement industry, which reportedly relies on the dwindling domestic stock of phosphogypsum, is anticipated an anticipated source of continued growth in demand. …
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Calcium molybdate (CaMoO4) is of significant interest due to its unique properties and numerous industrial applications, such as catalysis, electrochemistry, and optoelectronics. In this study, we developed an economical and environmentally friendly method to synthesize calcium molybdate from Moroccan phosphogypsum (PG) industrial waste …
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Therefore, recovery of REE from phosphogypsum not only has been hailed as a new source for these strategic metals but also potentially has additional environmental benefits such as removal of ...
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Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled. ... The concentrations of radionuclides and heavy metals in PG wastes vary considerably depending on the source and nature of the rock phosphates ...
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China produces and consumes significant quantities of phosphate fertilizer [1], [2], [3], [4].Phosphoric acid is an important raw material for preparing the phosphoric fertilizer [1], [5], [6], [7], [8].The preparation of wet phosphoric acid is one of the main sources of producing phosphoric acid [9], [10], [11].In this process, industrial solid waste of …
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Phosphogypsum (PG) is a kind of industrial solid waste residue that is generated during the wet production of phosphoric acid. The main mineral composition of PG is CaSO 4 ·2H 2 O, and it is currently employed mostly in the field of building materials and the chemical industry [].PG has a complex chemical makeup and contains …
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"That leaves Oman as the single most important source of high grade natural gypsum for cement and gypsum board manufacturers across Asia and South/East Africa," he observed. Underscoring the surging demand for Omani gypsum, Salalah Port handled a record 1.6 million tonnes of the mineral during the first two months of this year.
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This results in phosphogypsum storages being complex sources of pollution and environment deformation; they disturb the terrain, interrupt or change the natural flow of intrasoil migration of substance, pollute the landscape with technogenic substances, change the nature of surface air flows, and affect the humidity index of the site.
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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 ...
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OMAN PAKISTAN PALAU PANAMA PARAGUAY PERU PHILIPPINES POLAND PORTUGAL QATAR REPUBLIC OF MOLDOVA ROMANIA ... Phosphogypsum is generated as a by-product of the phosphoric acid based fertilizer industry. The discharge of phosphogypsum on earth surface deposits is a potential source of enhanced
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The paper is focused on the research of biochemical treatment of sewage sludge and phosphogypsum under sulphate-reducing conditions with a phosphorus release process. The theoretical foundations of the work were based on the biochemical formalization using the principles of autocatalysis of natural systems. During the …
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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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Sedimentary phosphate rocks are characteristically rich in organic matter, and contain sulfides and a high concentration of trace elements, including cadmium (Cd), which is harmful to the human body. The mining of phosphate rock and phosphogypsum at Qingping has expanded the release of Cd into groundwater and farmland soil. To …
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Phosphogypsum is a solid waste byproduct from processing phosphate ore to make phosphoric acid that is later used in fertilizer. Phosphogypsum contains …
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This study demonstrates the feasibility of using phosphogypsum as the sole CaO source in the preparation of calcium sulfoaluminate cement by considering its mechanical properties and the potential ...
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Oliveira and Imbernon (1998) investigated the geochemistry and mineralogy of the Catal~ao I carbonatite complex weathering profile from where the source phosphate rock for the two Table 2 Rare earth elements concentration in rock and phosphogypsum samples from industries A and C (mg g 1) Industry A Industry C Mean Range Mean Range Phosphate ...
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Phosphogypsum is primarily CaSO 4 ·2H 2 O, but also contains impurities of environmental concern such as residual acids, fluoride, heavy metals and naturally-occurring radionuclides. Impurity composition within phosphogypsum can vary greatly depending on the source of phosphate rock used in phosphoric acid production.
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Environmental impact and management of phosphogypsum. Hanan Tayibi, ... Aurora López-Delgado, in Journal of Environmental Management, 2009. Phosphogypsum (PG) is a waste by-product from the processing of phosphate rock by the "wet acid method" of fertiliser production, which currently accounts for over 90% of phosphoric acid …
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Phosphogypsum is a by-product originated from wet-process phosphoric acid, which contains some impurities such as soluble phosphorus, soluble fluorine, some salts, heavy metals and organic compounds, which lead to difficulty to be used. Jillion phosphogypsum accumulated not only occupies land, pollutes the circ。umjacent …
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Phosphogypsum is used in agriculture for soil amendment or as fertilizer, as well as in the brick and cement industry, and in road construction ... (78.9 wt%) makes this waste a potential source ...
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Phosphogypsum capacity as a source of mobile contaminants in three environmental scenarios (water leaching, exposure to oxidising and reducing conditions) was quantified by combining sequential ...
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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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The phosphogypsum currently produced is stockpiled near the production site. Due to considerable demand for provision of a reference material with a phosphogypsum matrix from IAEA Member State laboratories which have phosphate industry, IAEA prepared and released a phosphogypsum reference material (IAEA-434) after
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Abstract. Phosphogypsum (PG: CaSO 4 ·2H 2 O) is a waste product generated by the phosphate industry. World production of this waste exceeds 200 million tonnes per year. PG, discharged into the …
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Additionally, several books published by the IAEA were used as a source of summarised data. Physico-chemical characteristics of phosphogypsum Phosphogypsum is a grey, damp, fine-grained material (silty or silty-sandy) with a maximum grain size between 0.5 and 1.0 mm and 50–75 % of particles finer than 0.075 mm ( 6 ).
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DOI: 10.1016/J.ATMOSRES.2019.104650 Corpus ID: 202127808; Geochemistry and source contribution of fugitive phosphogypsum particles in Huelva, (SW Spain) @article{TorresSnchez2019GeochemistryAS, title={Geochemistry and source contribution of fugitive phosphogypsum particles in Huelva, (SW Spain)}, author={Raquel Torres …
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Oman: Producers and exporters despatched 9.9Mt of gypsum from Oman in 2022. The figure corresponds to year-on-year growth of 13% from 8.74Mt in 2021. ... The Indian cement industry, which …
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Table 3 shows the chemical composition of phosphoric rock, phosphogypsum dihydrate and the variation of the main elements based on the origin of the phosphoric rock and the type of geological formations. The amount of phosphoric rock and phosphogypsum sources of sedimentary origin is higher than those of igneous …
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Abstract. Phosphogypsum (PG), the main industrial by-product of phosphate fertilizer industry, primarily consists of calcium sulfate dihydrate. However, it …
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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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This necessitates thorough testing of phosphogypsum to confirm feasibility and gather the data necessary for scale up around the unique source of phosphogypsum to be processed and its intended application. Conclusion. Phosphogypsum is a large-scale waste in the phosphates industry, incurring substantial management costs every year.
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