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processing of phosphogypsum for the manufacture of gypsum p
Treating waste phosphogypsum for cement and plaster manufacture
In the investigation reported in this paper, treatment of phosphogypsum with aqueous citric acid solution was attempted to purify phosphogypsum and improve its The achievable degree of impurity extraction enables use of the purified material as a gypsum raw material for manufacture of gypsum binders and cement. The On integrated processing of phosphogypsum SpringerLink
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An improved process for the purification of phosphogypsum
In tile Russian process, the purification of phosphogypsum is conducted by adsorbing the impurities, P205 and F, using a bed of aluminium silicate and lime. To 90% of REE remain in gypsum when hemihydrate technology is used, when dihydrate technology is used, 20-30% of REE remain in wet-process phosphoric Phosphogypsum Technology with the Extraction of
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SVXP Study on Pretreatment of Phosphogypsum
It is produced by sulphuric acid processing of natural apatites and phosphorites into phosphoric acid, superphosphate, precipitate and other phosphoric The phosphogypsum (PG) is a solid byproduct generated by the manufacture of phosphate fertilizers during the production of phosphoric acid [1]. The PG Phosphogypsum purification for plaster production: A
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SVXP3URFHVVLQJ0HWKRG IOPscience
Phosphogypsum is a large-capacity waste material resulting from the production of wet-process phosphoric acid in the process of sulfuric decomposition of Preparation of gypsum with high purity and whiteness from phosphogypsum for CO2 mineral sequestration. Phosphogypsum (PG) is a solid waste Preparation of gypsum with high purity and whiteness from phosphogypsum
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Effective and innovative procedures to use phosphogypsum
This process consists of attacking the natural calcium phosphate ore (apatite) with sulfuric acid according to the simplified scheme shown in Fig. 1 [ 9, 10, 11 ]. The shortcomings of common equipment for utilization of phosphogypsum when processing it into semi-aqueous gypsum have been analyzed. Specific energy consumption per ton of produced construction gypsum in different equipment is shown. Calcination duration is compared. The reasons for the uncompetitivity of theSVXP Study on Pretreatment of Phosphogypsum
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Sustainable Approach for Recovery of Sulfur from
A new sustainable method that consists of using sulfuric acid is proposed to process the Algerian phosphogypsum to recover the sulfur, which is imported in huge quantities until today. TheThis work aims to study the possibility of recycling original phosphogypsum as raw material for the manufacture of self-leveling mortar. Over 90% of phosphoric acid is manufactured through the wet process technique which features dissolving phosphorus ore with sulfuric acid and phosphogypsum (PG) is a waste byproduct from this processingUtilization of original phosphogypsum as raw material for
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Moroccan Phosphogypsum: Complete Physico-Chemical
This slurry presents a mixture of phosphogypsum (PG) which is calcium sulfate dihydrate crystals CaSO 4.2H 2 O, and phosphoric acid 29% in P 2 O 5 in addition to other some impurities occurred from crude phosphate.. The production of phosphogypsum has significantly increased as a result of recent phosphate industry advancements in By-product gypsum is separated from the slurry (called phosphogypsum slurry) by filtration, while metallic impurities of P i rock mostly move to the filtrate. Although the filtrate itself cannot meet technical-grade requirements for PA because of impurities such as metals, hydrofluoric acid, and sulfate, it is marketable as a fertilizing material for Industrial-Scale Manufacturing of Phosphoric Acid Using
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Novel Synergistic Process of Impurities Extraction and
Phosphogypsum, as a byproduct of wet-process phosphoric acid reaction, has caused many environmental pollution problems. To improve the property and purity of phosphogypsum in the wet-process phosphoric acid process, a liquid–solid–liquid three-phase acid hydrolysis synergistic extraction reaction system was established by adding a Conclusion. In this study, the “reverse-direct flotation” method effectively promotes the quality and whiteness of the waste high-silica phosphogypsum. After closed-circuit flotation, for the PG concentrate, the whiteness reaches 63.42, the purity of CaSO 4 2H 2 O reaches 96.70%, and the content of SiO 2 is reduced from 11.11% to 0.07%.Flotation purification of waste high-silica phosphogypsum
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Reuse of phosphogypsum pretreated with water washing as
Singh 17 depicted that the pretreated PG (treating with 3–4% aqueous citric acid) could be used as an additive in place of mineral gypsum for the manufacture of ordinary Portland cement andPhosphogypsum (PG) is an industrial by-product appeared from processing phosphate rocks by the wet process for phosphoric acid production (Khaless et al. 2022; Meng et al. 2022).The reaction which occurs during the digestion of phosphate rocks with concentrated sulfuric acid is as follow (R1) (Gasser et al. 2019; Wang et al. Staged purification of phosphogypsum using pH-dependent
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Phosphogypsum US EPA U.S. Environmental Protection
Phosphogypsum is a solid waste byproduct from processing phosphate ore to make phosphoric acid that is later used in fertilizer. Phosphogypsum contains radium, which decays to form radon gas. Both radium and radon are radioactive and can cause cancer. The Clean Air Act regulations require that phosphogypsum be managed in Phosphogypsum (PG) contains a lot of soluble phosphate (PO 4 3--P) and fluorine ion (F-), which seriously has hindered the sustainable development of the phosphorous chemical industry. In this study, a new burning raw material (BRM) as an intermediate product in the cement production process was used for PO 4 3--P and F Preparation of paper-free and fiber-free plasterboard with
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Utilization of solidified phosphogypsum as Portland cement retarder
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste. Cement using raw PG as retarder has two problems pressing for solution,namely, delaying the setting time and difficulty being fed into the cement mill. The soluble phosphates in PG behave as super The co-crystalline P was fully released during the dissolution process, which was necessary to efficiently eliminate P impurities. HCl dissolved the released P and transformed them into the protonated specie (H 3 PO 4) with less similarity to SO 4 2−, which prevented the recombination of the released P with gypsum during the Efficient extraction of impurities from phosphogypsum
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Environmental impact and management of phosphogypsum
The production of phosphoric acid from natural phosphate rock by the wet process gives rise to an industrial by-product called phosphogypsum (PG). About 5 tons of PG are generated per ton of phosphoric acid production, and worldwide PG generation is estimated to be around 100–280 Mt per year. This by-product is mostly disposed of 1. Introduction. Phosphogypsum (PG) is an industrial waste derived from the wet process for the manufacture of phosphorus fertilizer, during which the natural phosphate rock ore reacts with sulfuric acid [[1], [2], [3]]: (1.1) Ca 5 (PO 4) 3 F + 5 H 2 SO 4 + 10 H 2 O → 3 H 3 PO 4 + 5 C a SO 4 ⋅ 2 H 2 O + HFApproximately 4–5 tons of PG are generated Recycling of phosphogypsum to prepare gypsum plaster:
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The Investigation of Phosphogypsum Specimens Processed
Phosphogypsum (further PG) is a by-product from the production of phosphoric acid, which is used in the industry of phosphorous fertilizers. According to International Atomic Energy Agency [ 1 ], with the production of 1 t of P 2 O 5, 4–6 t of PG are obtained. In 2013 the global production of PG was 160∙10 6 t and the prediction for Physical and mechanical properties (ability to grip with a simultaneous transition to the calcium sulfate dihydrate form, being in theα-form of gypsum binders) make phosphogypsum a promising material for direct production of building products, gypsum stone, and gypsum binders. Processing and application of phosphogypsum are beneficial Recycling of radioactive phosphogypsum wastes
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Solar thermal treatment of phosphogypsum and its impact
Apart from mineral gypsum, phosphogypsum (PG) and Flue Gas Desulphurization (FGD) gypsum are other types of gypsum. PG generation in India is about 8.4 million tonnes per annum. PG is produced as a by-product during the manufacture of phosphoric acid using a single (di-hydrate) or two-step (hemihydrate-di-hydrate) process.Phosphogypsum (PG) is an industry solid waste produced from phosphoric acid manufacture. To reduce environmental pollution of the PG, H 2 C 2 O 4 was employed to purify it, which then can be used for cement production. The optimal concentration of H 2 C 2 O 4 for PG purification was determined. In addition, differential thermal analysis Efficient removal of phosphate impurities in waste phosphogypsum
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