Dehydration characteristics of struvite-K pertaining to magnesium potassium phosphate cement system in non-isothermal condition

Zhang, Siyu; Shi, Huisheng; Huang, Shaowen; Zhang, Ping

doi:10.1007/s10973-011-2170-9

Cited by 103 publications

(39 citation statements)

References 17 publications

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“…The dehydration behaviour of FA/MKPC and GBFS/MKPC binders as measured using TGA and derivative thermogravimetric (DTG) analysis, shown in Figure 3, was found to be comparable to that of pure struvite-K systems 23 . Significant mass changes occurred between 40 °C and 110 °C, which were calculated to be -18 % and -20 % for the two blends respectively.…”

Section: Thermogravimetric Analysismentioning

confidence: 87%

Evolution of phase assemblage of blended magnesium potassium phosphate cement binders at 200° and 1000°C

Gardner

Lejeune

Corkhill

et al. 2015

Advances in Applied Ceramics

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The fire performance of magnesium potassium phosphate cement (MKPC) binders blended with fly ash (FA) and ground granulated blast furnace slag (GBFS) was investigated up to 1000 °C using XRD, TGA, and SEM techniques. The FA/MKPC and GBFS/MKPC binders dehydrate above 200 °C to form amorphous KMgPO 4 , concurrent with volumetric and mass changes. Above 1000 °C, additional crystalline phases were formed and microstructural changes occurred, although no cracking or spalling of the samples was observed. These results indicate that FA/MKPC and GBFS/MKPC binders are expected to have satisfactory fire performance under the fire scenario conditions relevant to the operation of a UK or other geological disposal facility.

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Section: Thermogravimetric Analysismentioning

confidence: 87%

Evolution of phase assemblage of blended magnesium potassium phosphate cement binders at 200° and 1000°C

Gardner

Lejeune

Corkhill

et al. 2015

Advances in Applied Ceramics

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“…The two broad IR bands located at 3514.42 cm −1 and 3275.24 cm −1 [21] are assigned to the H-O-H stretching vibrations of the water in crystals, while the two weak bands at 2478.61 cm −1 and 2393.74 cm −1 correspond to H-O-H stretching vibrations of cluster of water molecules in crystallization [22]. The medium intense bands appeared at 1699.34 cm , while a medium absorption band at 891.14 cm −1 indicates the wagging modes of vibration of the coordinated water and metal-oxygen bond in the complex [21].…”

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

“…However, the peaks near the region 500 cm −1 correspond to the ν 2 symmetric bending vibrations and ν 4 asymmetric bending vibrations of PO 4 units. A shoulder at 684.75 cm −1 indicates the presence of metal-oxygen bond [22] [41].…”

Section: Ftir Spectroscopic Analysismentioning

confidence: 99%

“…Chauhan et al [21] and Siyu Zhang et al [22] reported the dehydration characteristics of struvite-k crystals by TGA. In the present study, grown sample was also analyzed by TGA for thermal studies.…”

Section: Thermogravimetry (Tga)mentioning

confidence: 99%

“…Ni-Struvite and Zn-Struvite were grown by slow evaporation method [31] [32], by feeding a cottonseed meal and rice straw diet supplemented with MgO, Sun et al [23] investigated struvite-k crystals in six goats. Zhang et al [22] observed the dehydration characteristics of synthesized struvite-k at N 2 atmosphere. Banks et al [19] have grown the struvite-k crystals by gel diffusion technique and observed the needle shape crystals; however Chauhan et al [21] have grown these crystals in silica gel by single diffusion gel techniques and observed different morphologies with changing growth parameters.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Characterization of Struvite-k Crystals by Agar Gel

Suryawanshi¹,

Chaudhari²

2014

JCPT

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The phosphate mineral struvite is basically formed in urinary tracks and kidney. One of the analogous compounds of struvite is potassium magnesium phosphate hexahydrate (KMgPO 4 •6H 2 O), known as struvite-k crystal and found in animal urinary calculi. In the present investigation, struvite-k crystals were grown by single diffusion and double diffusion techniques in agar gelmedium. The grown crystals were analyzed by optical microscopy, scanning electron microscopy (SEM), fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray analysis (EDXA) and thermogravimetric analysis (TGA). Optical microscopy and SEM exhibited the different morphologies. The FTIR spectra revealed the presence of water molecules, stretching and bending vibrations of phosphate (PO4) ions. However the powder XRD results from the crystalline nature. Elemental composition in the crystal was obtained by EDXA, while 36.89% weight loss of water molecules is observed in TGA study.

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