At present, phosphogypsum production is significant in China, with the top five provinces being Hubei, Yunnan, Guizhou, Sichuan and Anhui [1]. The random discharge and accumulation of phosphogypsum has seriously damaged the ecological environment, which not only polluted the groundwater resources, but also caused a …
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Distribution of phosphogypsum in China. In 2014, total phosphate fertilizers (as P2O5) production in China was 17.09 Mt. The aggregate production in Yunnan, Guizhou, …
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Phosphogypsum (PG) is an industrial waste from the production of phosphoric acid.The impurities in PG limit its utilization in building materials, and make PG decompose easily at high temperatures. Calcium sulphoaluminate (CSA) cements are insensitive to the presence of impurities and show some desirable performance. The aim …
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Shuhua Liu et al. [12] added phosphogypsum neutralized by lime to persulfate cement, which accelerated the hydration process of the persulfate cement, shortened the time required for setting, and ...
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Conclusion TSP complex at Chittagong is the main source of phosphogypsum production in Bangladesh. The industry occasionally sales the product at low price but mainly use for landfilling. 5-10% addition of phosphogypsum with Portland cement clinker gave promising results while tested various fresh and hardened …
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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 stacks additionally contain low-pH process water and heavy metals as a result of the wet acid fertilizer production process. The regulations at 40 CFR 61 Subpart R require …
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Phosphogypsum (PG) is the primary byproduct generated during the production of phosphoric acid, an intermediate product in phosphate fertilizer production, from calcium phosphate (apatite) ore. PG also exists in very small amounts in nature where it is the result of natural guano processes as they took for instance place in the …
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The properties of such cement, cement mortar and concrete mixes produced compared with conventional mixes. The conventional concrete mixes have been modified to accommodate raw phosphogypsum as a part of cement to be suitable for the concrete, for workability and 28 days compressive strength varying from 15 N/ mm 2 to 25 N/ mm 2 .
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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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Phosphogypsum (PG) is a bulk industrial solid waste generated during phosphoric acid manufacturing. This study investigated a novel phosphogypsum-based geopolymer (PBG) cement through L 16 (4 5) orthogonal experiments.The impact of five alkaline activators, including Portland cement clinker (PCC), sulfate alumina cement clinker (SACC), …
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Phosphogypsum (PG) is reused as aggregate in the cemented backfill, which effectively improves the PG reutilization efficiency.
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It appeared as an off-white powder with a pH of 4.17 and was acidic. Before the test, the PG was dried to a consistent weight in an oven at 50 °C and then ground for 20 min in an SM500×500 cement test mill. The OPC was an ordinary silicate cement with a content of 42.5% manufactured by Huaxin Cement Co., Ltd. (Honghe, China).
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Ordinary Portland cement (OPC cement) is a crucial material for civil and building engineering and is widely used in making concrete, mortar, and other products 1.More than 98% of the OPC cement ...
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The CaSO 4 ·2H 2 O content in phosphogypsum (PG) exceeds 90%, which renders it suitable to be used as a component of calcium sulfoaluminate (CSA) cement. In this study, PG was utilized as a component of CSA cement. The immobilization of soluble phosphorus (s-P 2 O 5) and heavy metals in PG, the radioactivity and the performances …
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It is estimated that until 2050, there will be a 12–13% increase in cement production. The result will be an overall 4% CO 2 emissions increase. However, with the use of mineral additives and industrial by-products, ... Phosphogypsum-based cement is prone to undergo moisture, due to the ease of solubilization in the presence of water ...
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whereby 5 tons of phosphogypsum are generated for every ton of phosphoric acid. As worldwide rock phosphate production increases and P 2 O 5 consumption from fertilizers rises, global phosphogypsum output is expected to reach 100–280 Mt per year (Yang et al. 2009).. Phosphogypsum contains significant …
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The incorporation of phosphogypsum (PG) in magnesium potassium phosphate cement (MPPC) can promote the utilization of PG not only by utilising the phosphate impurity in PG, but also by immobilising the heavy metals with MPPC. This paper investigates the feasibility of the incorporation of PG in preparing MPPC. Both early age …
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Phosphogypsum is a significant industrial solid by-product generated during the wet process of phosphoric acid production, with approximately 5 tons of phosphogypsum produced for every 1 ton of phosphoric acid [].The wet process for phosphoric acid production is preferred due to its simplicity, mature technology, and …
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Phosphogypsum (PG) is a solid by-product generated in the production of phosphoric acid (PA) using conventional synthesis methods. The raw material, about 50 times more radioactive as compared to unperturbed soils, is dissolved in diluted sulfuric acid (70%) forming PG and PA. ... cement, plasterboard, and agricultural additives). However ...
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The sample of PG used in the study was obtained from a phosphate fertilizer plant in Yunnan, China. ... For CSA cement production, ... Treating waste phosphogypsum for cement and plaster manufacture. Cem …
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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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This paper examines the production of Portland cement CEM II using heat-treated slate waste. The fineness index results were 10.95 % for the 75-μm sieve and …
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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 …
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1. Introduction. Phosphogypsum (PG) is the major by-product of the wet phosphoric acid industry (Li et al., 2023), which is primarily composed of calcium sulfate dihydrate, along with some impurities including soluble phosphorus, fluorine, and heavy metals (Ou et al., 2023).Approximately 4–5 tons of PG are generated from the …
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Cai, Q. et al. Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement. Sci. Total Environ. 780, 146600 (2021).
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DOI: 10.1016/j.jobe.2024.108483 Corpus ID: 267007670; Study on the mechanical properties, microstructure and hydration mechanism of phosphogypsum-based geopolymer cement with added micron-sized silica particles
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1. Introduction. Phosphogypsum (PG), the main component is gypsum (CaSO 4 •2H 2 O), is a primary by-product during the production of the phosphate fertilizers (Chernysh et al., 2021; Wang et al., 2020).In addition to gypsum, there are also lots of impurities in phosphogypsum, such as organic matter, SiO 2, soluble fluorine, …
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In recent years, many scholars had put forward a new idea in which the New Suspension Preheater Cement Production Technique (or NSP) would be used to decompose phosphogypsum to produce vil and ce...
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In recent years, many scholars had put forward a new idea in which the New Suspension Preheater Cement Production Technique (or NSP) would be used to …
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The present paper deals with the experimental investigation on slump number of fresh concrete, 28-day compressive strength characteristics of concrete using only 10% cement, 30% - 60% phosphogypsum and granulated blast furnace slag in binders named super sulfated cement with 3 different water-binder ratios of 0.45, 0.50 and 0.55…
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The optimal mix proportions for two types of lightweight soil, namely phosphogypsum cement microsilica (PGCF) and phosphogypsum cement slag …
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Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, …
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@article{Liang2023StudyOT, title={Study on the properties of an excess-sulphate phosphogypsum slag cement stabilized base-course mixture containing phosphogypsum-based artificial aggregate}, author={Yangshi Liang and Bin Guan and Tingwei Cao and Gang Liu and Pei Tang and Minghao He and Mohamed F. Cheira and …
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Phosphogypsum (PG) is typical chemical gypsum, which is the by-product obtained from the reaction between the phosphate rock and sulphuric acid during the production of phosphoric acid, compound fertilizers and synthetic detergent [].Normally, the PG contains 0.1–1.5 % of F −, a small quantity of heavy-metal ions and radioactive …
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Based on the physical and chemical properties of red sandstone (RS), RS is used to produce composite cementitious materials. The flowability, mechanical strength, and micromechanics of a red sandstone–cement binary cementitious material (RS-OPC) were investigated as functions of the amount of RS replacing the cement (OPC). …
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China also has significant production of phosphogypsum, and the five largest provinces in terms of production are Hubei, Yunnan, Guizhou, Sichuan, and Anhui [5]; hence, they these also have large ...
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The production of phosphate fertilizer (as P 2 O 5 ) and phosphogypsum in China during 2000-2015. a Some data were cited from references of [9-13].
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Eco - concrete made with phosphogypsum-based super sulfated cement Nguyen Ngoc Lam-Effect of curing temperature and particle size distribution on unconfined ... production in Yunnan, Guizhou, Sichuan and Hubei provinces was 12.53 Mt, accounting for 73.3% of the total production. The production in these provinces increased by 3.2% compared …
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1PG Student, Dept. of Civil Engineering, Mar Athanasius College of Engineering, Kerala, India 2Assistant Professor, Dept. of Civil Engineering, Mar Athanasius College of Engineering, Kerala, India -----***-----Abstract Phosphogypsum (PG) is a solid by-product of the production of phosphoric acid, a major constituent of many fertilizers, chemical …
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This experimental study suggests that phosphogypsum from industrial waste can be used as a cement substitute in concrete production. After 7 and 28 days, …
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