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The beneficiated phosphogypsum can be used as an additive in place of mineral gypsum in the manufacturing of Portland cement and Portland slag cement. …
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Abstract. The resource utilization of phosphogypsum (PG) can reduce the consumption of resources, turn waste into valuables, turn damage into profit, and form a green recycling economy of "resources-products-regenerated resources." The article, combined with the comprehensive utilization of PG, analyzes the existing problems. …
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This scheme substitutes phosphogypsum for part of the cement in the original cement-stabilized base, creating a cement-stabilized phosphogypsum mixed material (CSPM) base for road construction. The primary aim is to assess the energy consumption, carbon emissions, and environmental implications throughout various …
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Phosphogypsum, the by-product of phosphoric acid manufacture, is considered as a gypsum for the control of the setting time of Portland cement and trass cement. However, it is well known that impurities, usually included in phosphogypsum, injuriously affect the hydration of cement. The object of this paper is to clarify the …
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Recycling waste phosphogypsum (PG) into phosphogypsum-based cold-bonded aggregates (PCBAs) for eco-concrete production has received extensive attention due to its sustainability for construction industry development. Currently, PCBAs mainly replace the coarse aggregates in concrete while the fine aggregates remain natural sand (NS). This …
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Compared with the undisturbed phosphogypsum, the setting time of Portland cement made from modified phosphogypsum is significantly shorter; the early-strength is higher, and the compatibility with water reducing agent is better. The microscopic test results showed that the CFB fly ash has good self-hardening properties.
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Phosphogypsum (PG) is a solid waste product that is generated in the phosphoric acid manufacturing process, most of which is currently sent to landfills rather than reused. In this study, beta-hemihydrate phosphogypsum (β-HPG), slag, fly ash (FA) and alkali activator were mixed to form a phosphogypsum-based geopolymer (PBG) …
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Building elements made of phosphogypsum, such as wallboards and similar construction elements, give yield to high values of radon emanation together with the mentioned elevated concentrations of 226 Ra. Phosphogypsum can be used in Portland cement as a setting time retarder in amounts below 4–5 wt%; then, it is diluted in the concrete and ...
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This work provides a literature review of the most relevant advances on cement-based phosphogypsum. The data are analysed following these steps: (i) collection of data, (ii) the classification of data according to specific topics, (iii) the organization of …
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2. Phosphogypsum is a by-product of phosphate fertilizer plants and chemical industries for manufacture of phosphoric acid by the action of sulphuric acid on the rock phosphate. It can be gainfully utilized in cement and building materials industries. It needs beneficiation before use because of the presence of deleterious constituents like …
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Raw phosphogypsum (RPG) and calcined phosphogypsum (CPG) were treated by biowashing, and the potential of treated PG used for cement paste …
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Bayer Red mud (BRM) and phosphogypsum (PG) are known as two main industrial wastes around the world. Previous studies have demonstrated the contribution of BRM and PG in cement-based hydration reactions, but their collaborative role is still pending in cement-stabilized dredged soil.
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Phosphogypsum (PG), a by-product of phosphoric acid, is sensitive to the variation in water content. Therefore, this paper aims to investigate the use of hemihydrate PG (HH) mixed with a fine lateritic soil (S) and cement (C) considering the mechanical and durability characteristics in wet and dry cycles.
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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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Properties of phosphogypsum were evaluated and then the effect of various level phosphogypsum addition (2, 5, 10 and 15 percent by weight of cement) with Portland cement clinker was investigated.
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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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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 … Expand
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Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. ... Pineda, P. & García-Tenório, R. Valorization of phosphogypsum in cement-based materials ...
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Unmodified thermal-activated recycled cement (RC) paste has unfavorable properties like fast setting. This paper intends to modify RC by adding phosphogypsum (PG) and ground-granulated-blast-furnace-slag (GGBS).
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Singh [3] treated phosphogypsum with aqueous citric acid solution to purify phosphogypsum and improve its quality to make it fit for manufacture of cement and gypsum plaster for the first time. Portland cement and portland slag cement produced with purified phosphogypsum were found to have strength properties similar to those …
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Phosphogypsum treated by this means could successfully replace natural gypsum in Portland cement. Introduction Phosphogypsum is a by-product of the manufacture of phosphoric acid by a wet chemical ...
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Phosphogypsum was the by-products of wet production of phosphoric acid, it has more than 0.4 billion ton of emissions and less than 10% utilization rate in China. Nowadays, many researchers have attempted to handle with phosphogypsum, such as manufacturing β-hemihydrate gypsum and retarder for cement (Bensemlali et al., 2022).
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The physical-chemical properties, mechanical behaviour and environmental impact of these phosphogypsum-based cement mortars were determined. It was concluded that the phosphogypsum treatments and curing conditions influence the mineralogical transformations of mortars and therefore also the mechanical behaviour of …
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Buildings 2022, 12, 1774 5 of 17 Table 2. Design mineral composition of cement clinker (wt.%). Sample C4A3S $ C4AF C2S CS S1 74 8 18 0 S2 69 8 18 5 S3 64 8 18 10 S4 59 8 18 15
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In this study, a series of unconfined compression tests were conducted on the DC stabilized by the ternary hydration system consisting of ordinary Portland cement, recycled phosphogypsum and calcium aluminate cement, the effects of the Al 2 O 3 /SO 3 molar ratio (m) on the mechanical properties were evaluated accordingly.
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The material has therefore, tried to incorporate in cement manufacturing considering its sustainable use. Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was collected from a local fertilizer industry.
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Phosphogypsum (PG) is a residue from the fertilizer industry used by Portland cement companies as a source of calcium sulfate to control the setting time during the …
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Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement. Sci. Total Environ., 780 (2021), Article 146600, 10.1016/j.scitotenv.2021.146600. View PDF View article View …
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For the sake of effectively reducing the accumulation of phosphogypsum, mixtures were prepared with cement as a curing agent and mass ratios of cement to phosphogypsum of 1:1, 1:2 and 1:3 (low ...
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In the investigation reported in this paper, treatment of phosphogypsum with aqueous citric acid solution was attempted to purify phosphogypsum and improve its …
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In the investigation reported in this paper, treatment of phosphogypsum with aqueous citric acid solution was attempted to purify phosphogypsum and improve its quality to make it fit for manufacture of cement and gypsum plaster for the first time. The treatment of gypsum converts phosphatic and fluoride impurities into water-removable …
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Purifying phosphogypsum for cement manufacture Manjit Singh*, Mridul Garg* and S. S. Rehsit *Central Building Research Institute, India tFormerly of CBRL Roorkee, India Received 21 July 1992; accepted 24 July 1992 Phosphogypsum available as a by-product from the wet process phosphoric acid industry in India contains various …
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The unconfined compressive strength (UCS), split tensile strength (STS), freeze-thaw cycles, and shrinkage tests were used to evaluate the mechanical …
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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 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 …
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Phosphogypsum is one of many waste products that can be used to create concrete. Phosphogypsum is a by-product of the industrial sector that can be used to prepare concrete for less money by reducing the strength development of calcined products. 1. The slump cone test, used to measure how easily a concrete mixture can …
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