Characterization and calorimetric study of early-age hydration behaviors of synthetic ye’elimite doped with the impurities in phosphogypsum

Huang, Yongbo; Qian, Jueshi; Liang, Jenn‐Tai; Liu, Na; Li, Fengling; Yan, Shi‐Ping

doi:10.1007/s10973-015-5009-y

Cited by 39 publications

(6 citation statements)

References 38 publications

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“…Wavenumber/cm -1 2000 1600 1200 800 400 The effect of polymer dispersions on the early hydration of calcium sulfoaluminate cement the active phases and water [42,[53][54][55]. An induction period will occur with relative low heat flow rate.…”

Section: Calorimetry Analysismentioning

confidence: 99%

Rejuvenation, embryonic shear bands and improved tensile plasticity of metallic glasses by nanosecond laser shock wave

Yan

Zhang

et al. 2019

Journal of Non-Crystalline Solids

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The influence of three polymer dispersions [styrene-butadiene copolymer (SB), styrene-acrylic ester copolymer (SA) and polyacrylic ester (PA)] on the hydration of calcium sulfoaluminate (CSA) cement within 72 h was investigated by using isothermal conduction calorimetry, X-ray diffraction analysis and thermal gravimetric analysis. The results indicate that these three polymer dispersions perform different influences on the hydration heat flow of CSA cement during different periods, they all postpone the occurrence time of the maxima peaks, and its extent is mainly dependent on the addition amount. Polymer dispersions manifest great retardation on the initial hydration of CSA cement, and the effect is much more significant within 1 h. In this stage, the generation of ettringite is strongly delayed; however, the formation of ettringite is accelerated by these polymer dispersions at and after 2 h. Among these three polymer dispersions, PA demonstrates the highest acceleration effect on the hydration degree.

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Section: Calorimetry Analysismentioning

confidence: 99%

Rejuvenation, embryonic shear bands and improved tensile plasticity of metallic glasses by nanosecond laser shock wave

Yan

Zhang

et al. 2019

Journal of Non-Crystalline Solids

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“…] in the sulphoaluminate lattice, increase the content of sulphoaluminate cubic crystal form, reduce the content of the orthorhombic crystal form, and promote the formation of sulphoaluminate (Huang Y et al 2016). In a study preparing sulphoaluminate cement with phosphogypsum, it was found that the F and P impurities in phosphogypsum can reduce the sintering temperature of clinker (Huang Y et al 2019;Santoro L et al 1987), the cubic crystal form of the main mineral phase sulfoaluminate increases, and the orthorhombic crystal form decreases; the crystal form of dicalcium silicate also changed from the β type to the ' type (Huang Y et al 2019) ] exists in the form of Ca 3 (PO 4 ) 2 , it can help stabilize dicalcium silicate in the β, ' and crystal forms (Benarchid M Y et al 2005;Saalfeld H et al 1981).…”

Section: Introductionmentioning

confidence: 99%

Existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue

Duan

et al. 2021

Environ Sci Pollut Res

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The phosphorus-sulfur two-step production process was developed in the wet-process phosphoric acid industry to solve phosphogypsum pollution. However, phosphate rock acid-insoluble residue is produced during this process as a new type of solid waste, which had a high potential for recycling. For process reasons, this type of residue still contains a certain amount of uorine and phosphorus, which has a massive impact on the potential uses of phosphate rock acid-insoluble residue. Therefore, X-ray photoelectron spectroscopy, Raman, electron probe spectroscopy and scanning electron microscopy were used to examine the existing form and distribution of uorine and phosphorus in phosphate rock acidinsoluble residue. The mass fraction of F and P 2 O 5 were 9.407% and 11.862%, respectively. Fluorine existed mainly in the form of uorite, uorapatite and metal uoride. Phosphorus existed mainly in the form of uoroapatite, phosphate, hydrogen phosphate and dihydrogen phosphate. The total phosphate, hydrogen phosphate and dihydrogen phosphate contents were much higher than that of uoroapatite, whereas the uoroapatite content was higher than that of uorite and metal uoride. Fluorine and phosphorus were distributed in the form of agglomerates in the phosphate rock acid-insoluble residue. Fluorine and phosphorus were partially correlated, showing a weak relationship in the high phosphorus area.

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“…The third occurs at 700-800 • C, where the decomposition reaction of limestone occurs at this stage, producing CaO and CO 2 , reacting as in Equation ( 1) [29]. The last occurs at 900 to 1030 • C and is due to the decomposition of PG, as shown in Equation (2) [38,39]. As the temperature continues to rise, 2CaO-Al 2 O 3 -SiO 2 begins to form, and when it increases to 1000 • C, C 4 A 3 S and C 2 S gradually develop, and the main chemical reactions that occur during the formation process are shown in Equations ( 3)-( 8) [18,40].…”

Section: Thermal Analysismentioning

confidence: 99%

Investigation of Process Parameters of Phosphogypsum for Preparing Calcium Sulfoaluminate Cement

Zhang

Chang

et al. 2022

Buildings

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Preparing calcium sulfoaluminate cement (CAS) from solid waste phosphogypsum (PG) instead of natural gypsum is an effective way to utilize solid waste. In this paper, CAS clinker was successfully prepared from PG and the mineral content of calcium sulfoaluminate () in the sample was above 65%. The effects of raw material ratio, calcination temperature, and time on clinker composition were investigated. The mechanical properties of different samples were tested. The optimum ratio for preparing CAS using PG was 42.23% limestone, 17.43% PG, and 40.34% bauxite. The optimal calcination conditions are a high temperature of 1250 °C for 45 min. The 3-day compressive strengths of the laboratory-prepared CAS were all above 50 MPa. It was found that as the calcination temperature increased, the amount of produced gradually increased. Temperatures above 1300 °C resulted in the decomposition of . The calcination time did not significantly affect the mineral composition of the clinker or the strength of the cement. was observed to be rounded and hexagonal platelets with crystal sizes of 1 to 2 μm, a relatively small size that is favorable to the hydration of , as observed by SEM images. In addition, the high calcination temperature affected the particle morphology of , changing it from a well-defined polygonal structure to a molten state. The test results provide helpful information for improving PG utilization and applying PG in CAS production.

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Characterization and calorimetric study of early-age hydration behaviors of synthetic ye’elimite doped with the impurities in phosphogypsum

Cited by 39 publications

References 38 publications

Rejuvenation, embryonic shear bands and improved tensile plasticity of metallic glasses by nanosecond laser shock wave

Rejuvenation, embryonic shear bands and improved tensile plasticity of metallic glasses by nanosecond laser shock wave

Existing form and distribution of fluorine and phosphorus in phosphate rock acid-insoluble residue

Investigation of Process Parameters of Phosphogypsum for Preparing Calcium Sulfoaluminate Cement

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