Use phosphogypsum to produce cement

Recycling of phosphogypsum for lowcarbon cement: Clinker

Utilizing PG to produce sulfoaluminate cement (SAC) offers a dual benefit of consuming PG and enhancing resource recycling This study focuses on preparing a lowcarbon phosphogypsum 2023年2月10日  Phosphogypsum had been used as the raw material to produce Portland cement, aluminum sulfate cement, supersulfated cement and to coproduce sulfuric acid and Resource utilization and development of phosphogypsumbased 2021年4月1日  It is concluded that cementitious materials produced from phosphogypsum are technically viable and achieve a satisfactory performanceValorization of phosphogypsum in cementbased materials: Limits 2012年6月27日  Chemical gypsums are used in cement factories not only to decrease the cost of the cement, but also to reduce the solid waste pollution In China, more and more cement Utilization of solidified phosphogypsum as Portland cement

Valorisation of Phosphogypsum in Concrete (NonLoad Bearing

p to now, phosphogypsum is used in the manufacture of Portland cement It has also been used in large quanti estined to the production of sulfuric acid from calcium Sulphate [13] In 1903, 2024年2月26日  Phosphogypsum (PG) is a byproduct produced during the wet process of phosphoric acid (H 3 PO 4) production from natural phosphate rocks Approximately 4–6 tons Properties, Purification, and Applications of Phosphogypsum: A 2020年6月1日  It is shown that Portland cement can be replaced with super sulfated cement based on Vietnam phosphogypsum to develop a good and hardened concrete to achieve concrete made with phosphogypsumbased super sulfated 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 UTILISATION OF PHOSPHOGYPSUM IN CEMENT MORTAR AND

Phosphogypsum: potential uses and problems – a

2017年6月19日  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 was2014年11月1日  Impurities in phosphogypsum, primarily fluorine and phosphates, complicate its use in any of the thermal processing schemes, but do not disqualify it from being used as a raw material The plant in South Africa uses 100% phosphogypsum as a feed stock, and the Polish plants are said to use a mixture of natural gypsum and phosphogypsumPHOSPHOGYPSUM: A Review of the Florida Institute of Phosphate Research 2017年1月1日  In the manufacturing process of cement, phosphogypsum could be used as a replacement of natural gypsum which plays the role of a set retarder [9, 10], or to (CaSO42H2O) or hemihydrate (CaSO405H2O) form depending on the reaction temperature used to produce phosphoric acid Usually free moisture content between 2530% exists in Effect of Phosphogypsum on the Properties of Portland Cement2023年2月28日  21 Phosphogypsum Generation Processes The wet and dry process are the two main commercial processes used to produce phosphoric acid from natural phosphate The dry process consists of a thermal reduction of rock phosphate at 2000 °C using an electrical furnace in the presence of coke or silicaPhosphogypsum: Properties and Potential Use in Agriculture

Purification of South African phosphogypsum for use as Portland cement

2004年9月1日  The presence of Na stabilizes the structure and produces significant changes in the refractive These impurities seriously restrict the industrial use of phosphogypsum in cement industry as 1977年9月1日  CEMENT and CONCRETE RESEARCH Vol 7, pp 537544, 1977 Pergamon Press, Inc Printed in the United States UTILIZATION OF PHOSPHOGYPSUM IN PORTLAND CEMENT INDUSTRY by P K Mehta and James R Brady Department of Civil Engineering, University of California at Berkeley Berkeley, CA 94720 (Refereed) (Received April 28; in final Utilization of phosphogypsum in portland cement industry2002年7月1日  It is essential to remove these impurities to use phosphogypsum for controlling the cement hydration MgO 321%, SO 3 041%, Na 2 O 031%, K 2 O 040%, insoluble matter 024% and loss on ignition 046% was used to produce cement The phase composition of cement clinker as calculated from the Bogue analysis method was C 3 S 4340% Treating waste phosphogypsum for cement and plaster In this work, both LS and phosphogypsum are used to produce CSAB cement clinker The target phase composition was 40 wt% ye’elimite (C4A3$), 35 wt% belite (C2S), 20 wt% ferrite (C2F) and 5 wt% anhydrite (C$) A high iron content was chosen because of Alternative raw materials for the production of calcium

Collaborative Utilization Status of Red Mud and Phosphogypsum:

2022年9月29日  In China, the domestic utilization of phosphogypsum is mainly in building materials, industry, and agriculture As shown in Fig 4, from 2015 to 2019, in China, phosphogypsum was mainly used in terms of external supply, cement retarder and gypsum board, filling, etc Thus, China’s use of phosphogypsum is still at a low level and low value stage2020年7月1日  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 Application of Lime Neutralised Phosphogypsum in Supersulfated Cement2023年11月15日  PG used as a cement retarder can greatly reduce PG accumulation Efficient precipitation of soluble phosphorus impurities in the recycling of phosphogypsum to produce hemihydrate gypsum J Clean Prod, 396 (2023), Article , 101016/jjclepro2023Deep removal of phosphate impurities in phosphogypsum by DOI: 101016/jjobe2023 Corpus ID: ; Deep removal of phosphate impurities in phosphogypsum by twostep crystal transformation for use as Portland cement retarderDeep removal of phosphate impurities in phosphogypsum by

Incorporation of phosphogypsum with cement in rigid Pavement:

2023年4月10日  For the M25 design mix, a watercement ratio of 045 was used, and phosphogypsum was added at 5 %, 75 %, 10 %, and 125 % to partially replace the cement The most important result of this study is that maximum strength can be attained by replacing up to 10 % of the cement with phosphogypsumSupersulfated Cement Applied to Produce Lightweight Concrete Liliya F Kazanskaya 1 , Olga M Smirnova 2 , Ángel Palomo 3 , Ignacio Menendez Pidal 4, * and Manuel Romana 4 Citation: Kazanskaya, LF;Supersulfated Cement Applied to Produce Lightweight Concrete 2017年12月31日  Various percentages (5%, 10%, 15%, and 20%) of Phosphogypsum as a replacement for Portland cement have been used to produce costeffective SCC with favorable properties and strengthEffect of Phosphogypsum on the Properties of Portland Cement 2012年6月27日  The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste Cement is the most massive manmade material, 004–008 ton of gypsum is needed to produce 1 ton of cement, and there were around 15 billion tons of cement produced in China in 2008Utilization of solidified phosphogypsum as Portland cement retarder

Production of Beneficiated Phosphogypsum for Cement

per cent, and glass content 910 per cent was used to produce portland slag cement Beneficiation of Phosphogypsum in the Pilot plant Based on the wet sieve technique, a pilot plant (Figurel) of capacity 10 tlshift was designed, fabricated, installed and successfully run to produce beneficiated phosphogypsum The pilot plant con­• Type V Citadel Leharve cement (5 percent C3A), •Type V United cement (3 percent C3A), and • Type II Lone Star cement (0 percent ~A) 29 The use of various cements is necessary because of the influence of the tricalcium aluminate (C3A) present in the cement on the trength development and expansive charac­Use of ByProduct Phosphogypsum In Road ConstructionUsing phosphogypsum to produce sulfoaluminate cement and conducting pilot production Given that PG is acidic and can reduce the pH of the hydrated liquid phase when used as a cement component, specimens B1, B2, and B3 were designed based on PG20, which had the optimum strength profileRecycling of phosphogypsum for lowcarbon cement: Clinker 2013年4月1日  Request PDF The use of phosphogypsum in Syrian cement industry: Radiation dose to public (AZFC) produces phosphoric acid using the wet dihydrate process; The use of phosphogypsum in Syrian cement industry

Preparation of gypsum with high purity and whiteness from phosphogypsum

2023年3月13日  Cai, Q et al Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement Sci Total Environ 780, (2021)2019年4月11日  Morocco produces every year about 15 Characterization and purification of waste phosphogypsum to make it suitable for use in the plaster show that the treatment of PG by sulfuric acid 20 and 50% at 60 °C for 2 h is sufficient to make it suitable for used in the plaster and the cement respectively KEYWORD Characterization and purification of waste phosphogypsum to 2023年2月5日  Cement industry Reduce the clinkerization temperature (from 1470 to 1200 °C), [89] The use of PG in this sector required special treatments and neu tralizing methods (high energy demand) [ 90 Effective and innovative procedures to use Phosphogypsum has been studied for use in cement, bricks, plaster, and more, often with added benefits over virgin materials When used as a replacement for limestone, for example, phosphogypsum has proven to offer a better roadbedPhosphogypsum – An Industrial Byproduct with Value

Modification of phosphogypsum using circulating fluidized bed

2022年7月4日  From 31 Soluble phosphorus and soluble fluorine contents of modified phosphogypsum at different aging time, 33 Effect of modified phosphogypsum on properties of cement, it can be seen that when the undisturbed phosphogypsum content is 90% and the ratio of carbide slag to CFB fly ash is 6:4 (GX3), the modification effect is the best, and it can be used 2015年8月1日  Also, the technoeconomic feasibility of beneficiating phosphogypsum has been studied wherein the beneficiated phosphogypsum was used for making Portland cement and Portland slag cement, and the Super sulfated cement: formulation and uses ResearchGate2023年8月15日  For example, in the plaster industry only certain gypsum crystal sizes are acceptable to produce plasterboards Group 1, 2 and 5 are acceptable On the other hand, group 3 and 4 cannot be used for plasterboard production but could be Phosphogypsum circular economy considerations: A critical 2014年12月1日  routinely utilize phosphogypsum in the manufacture of building blocks and wallboard for the construction industry Phosphogypsum is thermally decomposed in South Africa to produce sulfur dioxide and cement clinker The abundance of inexpensive natural gypsum in the United States hasEVALUATION OF POTENTIAL COMMERCIAL PROCESSES FOR THE

Phosphogypsum as a construction material ScienceDirect

2017年11月10日  Kumar (2000) reported that calcined PG in proportions of 20–40% can be used with FAlime binders to produce bricks with suitable compressive strength Purification of South African phosphogypsum for use as Portland cement retarder by a combined thermal and sulphuric acid treatment method South Afr J Sci, 100 (2004), pp 411 ficient percentages of portland cement may produce a material comparable to soil cement This report contains the results of a study in which high lime fly ash and portland cement were used as stabilizing agents for phosphogypsum The phosphogypsum was collected from two differentThe Use of ByProduct Phosphogypsum for Road Bases and achieve economy Phosphogypsum in ordinary Portland cement mixes considerably retards setting time but does not contribute to produce unsound cement paste The compressive strength of phosphogypsum cement concrete with 5% and 10% are improve it indicates phosphogypsum concrete used in mass concrete workUtilization of Phosphogypsum in Cement Concrete Pavement: A 2014年4月1日  Calcium sulphoaluminate (CSA) cements are binders mainly composed of calcium sulphoaluminate, belite and gypsum in varying ratios, and the minor phases are tricalcium aluminate, ferrite, gehlenite or mayenite [1]The clinker is produced by burning mixtures of limestone, bauxite and gypsum at 1250–1350 °C, which is about 100–200 °C lower than the Calcium sulphoaluminate cements made with phosphogypsum:

Investigation on Utilization of Phosphogypsum as a Partial

materials used were Cement, Fine aggregate, Coarse aggregate and Phosphogypsum A Cement Ordinary Portland cement (CEM I425) was used The cement has specific gravity of 315 and fineness of 29x105 mm2/g B Fine Aggregates Natural sand with specific gravity of 261 was used as fine aggregates in the concrete specimens2023年12月15日  Phosphogypsum (PG) is a byproduct of the industrial wet process used to produce phosphoric acid For each molecule of calcium fluorophosphate, 3 mol of phosphoric acid and 5 mol of PG are produced [1], [2]The main component of PG is calcium sulfate dihydrate (CaSO 4 2H 2 O), which contains a small amount of phosphorus, fluorine, and silicon [3], [4]Study on the properties of an excesssulphate phosphogypsum slag cement 2022年1月1日  The calcination of phosphogypsum (PG) was employed to produce gypsum plaster to achieve its recovery and utilization Infrared study of the refinement of phosphogypsum for cements[J] Cement Concr Res, 18 (1988), pp 449454, 101016/00088846(88)900798 View PDF View article View in Scopus Google ScholarRecycling of phosphogypsum to prepare gypsum plaster: Effect 2012年8月4日  The changes that could and should be made to cement plants and equipment to produce cement more sustainably, cement being produced from it Phosphogypsum in particular contains phosphorous and An Overview of Cement production: How “green” and sustainable

Valorization of phosphogypsum in cementbased materials:

2021年4月1日  In this study, building phosphogypsum was used as the base material, and fly ash, lime, cement, and other materials were added to explore the performance of phosphogypsumbased cementitious 2021年3月1日  Typically, to achieve utilization of cement stabilized soil as raw materials in practice, engineering properties, such as strength, deformation modulus, permeability, needed to be thoroughly investigated correlating with the change in physiochemical behaviour 18 Recently, some researcher also focused on the effect of wet and dry cycling, freeze and thaw cycling Effect of phosphogypsum on physiochemical and mechanical 2020年4月2日  Phosphogypsum (PG) is generated annually from phosphoric acid production This byproduct contains 50% of sulfate (SO42−), which can be recycled biologicallySustainable Approach for Recovery of Sulfur from Phophogypsum2023年4月10日  Phosphogypsum (PG), a waste product of the phosphate fertilizer industry, is a source of environmental pollution PG can be calcined to form the hemihydrate gypsum (βCaSO 4 •05H 2 O, HPG), making it a potential substitute to natural gypsum However, PG contains large amounts of soluble phosphorus(P) impurities, which pose a serious risk on the soil and Efficient precipitation of soluble phosphorus impurities in the

Resistance of phosphogypsumbased supersulfated cement to

2020年12月10日  Therefore, in spite of the low resistance to carbonation presented by concrete with supersulfated cement, when a low w/c ratio (≤046) is used, it is possible to produce concretes that have adequate protection to the reinforcement, at least for 50 years of service life, in the rural and urban environment

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