Phosphogypsum had high calcium content, so it could be used in the production of cement raw materials in addition to being used as a cement retarder (Rosales et al., 2020). The mortar and concrete produced by cement that contained PG had high compressive strength, which meaned that using PG as a raw material for cement was technically possible ...
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Phosphogypsum (PG), a by-product of the phosphoric acid production process within the phosphorus chemical industry, presents significant environmental and resource management challenges. It is estimated that approximately 4.55–5 tons of PG are generated for every ton of phosphoric acid produced [[1], [2], [3]].
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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, soluble phosphorus, and heavy metals (Cánovas et al., …
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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). Additionally, the …
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In recent years, with the implementation of the phosphogypsum "production by use" policy, represented by Guizhou Province, from the reduction of incremental and stockpile reduction, all-round phosphogypsum consumption, to accelerate the comprehensive utilization of phosphogypsum has put forward new requirements. ... Cement: Yunnan Huaxin ...
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4 Yunnan Communications Investment & Construction Group Co., Ltd., Kunming 650100, ... production is preferred due to its simplicity, mature technology, and good stability [2]. With ... they prepared phosphogypsum-cement-slag ed lightweight soil and phosphogypsum-cement-fly ash ed lightweight soil [15]. ...
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Phosphogypsum (PG) is a major industrial by-product of wet process phosphoric acid production, and untreated PG stockpiled on land will cause severe environmental pollution. Thermal treatment of PG is currently the mainstream treatment method PG can be thermally decomposed to produce CaO, and the decomposition process produces large amounts of SO …
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The results reveal notable benefits for all three utilization technologies, with sulfuric acid co-production cement (PSC) offering the greatest environmental advantages and β …
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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 Concr Res, 32 (7) (2002), pp. 1033-1038.
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The rapid expansion of the phosphate chemical industry has led to a significant increase in phosphogypsum (PG), an industrial by-product of wet-process phosphoric acid production. Despite this growth, the resource reutilization rate of PG remains below 25 %, presenting a formidable challenge for the industry [1, 2]. PG contains various ...
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PDF | On Jan 16, 2016, Hongqi Huang published New common integration process for cement grinding of producing sulfuric acid and cement from phosphogypsum | Find, read and cite all the research you ...
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The key in acid and cement co-production by use of phosphogypsum with the new dry cement technology is to deeply learn the decomposition character of phosphogypsum.In this paper,studies have been made in the decomposition performance of phosphogypsum with the thermal analysis and the analysis of the cement new dry technology.The results show that the …
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Sandstone–Phosphogypsum–Cement Composite Cementitious Materials. ... Yunnan, China, could be processed into RS powder and utilized as a raw material in the ... production costs and contribute ...
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Phosphogypsum, a solid waste produced in the wet phosphoric acid process, can lead to severe environmental pollution. Recently, the resource utilization of phosphogypsum as a raw material for cement retarders and other products has received widespread attention, but it is limited by the high cost of purifying impurities, such as phosphorus and fluorine, contained in …
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1. Phosphogypsum: Phosphogypsum from a chemical plant in Yunnan, the analyt-ical results are shown in Table 16.1. 2. Cement: Yunnan Huaxin PC425 cement, standard curing 7d compressive strength of 30.8 MPa, standard curing 28d compressive strength …
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fiveprovinces with the largest phosphogypsum production are Hubei, Yunnan, Guizhou, Sichuan, and Anhui.2 The five provinces with the largest phosphogypsum production are Hubei, Yunnan, Guizhou, Sichuan and Anhui. It is predicted that the total amount of accumulated phosphogypsum will double in the future. Currently, the main methods of
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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 vitriol and ce...
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In summary, the current study found that sandstone has some volcanic ash activity and can be used to produce cementitious additives after pretreatment by calcination and alkali activation.
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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, soluble phosphorus, and heavy metals (Cánovas et al., …
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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 (DTA), X-ray …
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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 beneficiation of phosphogypsum procured from two sources was conducted in the pilot plant of 2 t/shift capacity installed at Central Building Research Institute (CBRI) to reduce impurities of phosphates, fluorides, organic matter, alkalies, etc. The techno-economic feasibility of beneficiating phosphogypsum has been highlighted. The beneficiated phosphogypsum was …
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The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable approach to remove …
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Cement: Yunnan Huaxin PC425 cement, standard curing 7d compressive strength of 30.8 MPa, standard curing 28d compressive strength of 46.5 MPa, burn loss of 23%.
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Phosphogypsum (PG) is a common industrial waste from the production of phosphoric acid by the wet process. Usually, it requires pretreatment before use due to the presence of impurities.
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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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yunnan phosphogypsum production cement in Oman Oman retains crown as world's biggest gypsum exporter … Exports of Omani gypsum – a key raw material for the cement and …
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Incorporation of phosphogypsum with cement in rigid … Most of the phosphogypsum used in the production of Fig. 2 came from the RSA Mart Kanpur in the Indian state of Uttar Pradesh. RSA Mart's Phosphogypsum is available in an off-white hue. Phosphogypsum (Phosphate of Gypsum) powder is white and has a specific gravity of 2.3 % to 2.6 %.
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AbstractPhosphogypsum (PG) is a bulk solid waste generated during the production of phosphoric acid. This study proposes a novel phosphogypsum-based geopolymer (PBG) cement with a 28-day unconfined compressive strength …
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