Struvite-(K), KMgPO46H2O, the potassium equivalent of struvite a new mineral

Graeser, Stefan; Postl, Walter; Bojar, Hans-Peter Berlepsch; Armbruster, Thomas; Raber, Thomas; Ettinger, Karl; Walter, Franz

doi:10.1127/0935-1221/2008/0020-1810

Cited by 115 publications

(64 citation statements)

References 2 publications

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“…The crystal structure was found to be orthorhombic with cell parameters as, a = 6.893 Å, b = 6.141 Å, c = 11.222 Å and α = β = γ = 90°. The values are closely matching with those reported by S. Graeser et al [6].…”

Section: Resultssupporting

confidence: 93%

“…Earlier, both the Struvite and Struvite-K were reported as iso-structural compounds [4,5]. Struvite-K was identified as a mineral at two different locations [6]: (1) at the famous sulphosalt locality of Lengenbach in Binntal, Switzerland, in a dolomitic rock of Triassic age, (2) at Rossblei, Austria, in an abandoned galena mine. The mineral occurs as pseudomorphous aggregates of dirty white colour reaching up to several millimeters in size.…”

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confidence: 98%

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Growth and characterization of Struvite‐K crystals

Chauhan

Vyas

Joshi

2011

Cryst. Res. Technol.

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Struvite-K is the natural potassium equivalent to Struvite. Struvite-K crystals were grown by single diffusion gel growth technique in silica hydro gel medium. Struvite-K crystals with different morphologies having transparent to translucent diaphaneity were grown with different growth parameters. The phenomenon of Liesegang rings was also observed with some particular growth parameters. The crystals were characterized by powder XRD, FT-IR, TGA and dielectric study. The powder XRD results of Struvite-K confirmed the orthorhombic crystal structure. The FT-IR spectrum proved the presence of water of hydration, metaloxygen bond and P -O bond. The TGA, DSC and DTA were carried out simultaneously. It was found that crystals started dehydrating and decomposing from 75 °C and finally at 600 °C temperature it became 64.14% of the original weight and remained almost constant up to the end of analysis. From the thermo-gravimetry, the numbers of the water molecules associated with the crystal were calculated and found to be 5. The kinetic and thermodynamic parameters of dehydration / decomposition process were calculated. The variation of dielectric constant with frequency of applied field was studied in the range from 400 Hz to 100 kHz, which exhibited the decreasing nature of the dielectric constant as frequency increased. The dielectric study showed that a.c. conductivity increased and consequently the a.c. resistivity decreased with the increase in frequency.

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Section: Resultssupporting

confidence: 93%

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confidence: 98%

Growth and characterization of Struvite‐K crystals

Chauhan

Vyas

Joshi

2011

Cryst. Res. Technol.

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“…(1)) is based on the dissolution of MgO and KH 2 PO 4 reacting in solution to form struvite-K (MgKPO 4 ·6H 2 O), which is isostructural to struvite (NH 4 MgPO 4 ·6H 2 O) [2] and is naturally cementitious. In 2003, struvite-K was classified as a distinct mineral species by the Commission of New Mineral and Mineral Names, International Mineralogical Association (CNMMN-IMA) after it was discovered naturally in two locations; Binntal, Switzerland and the Styria region of Austria [3].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

Gardner

Bernal

Walling

et al. 2015

Cement and Concrete Research

269

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Magnesium potassium phosphate cements (MKPCs), blended with 50 wt.% fly ash (FA) or ground granulated blast furnace slag (GBFS) to reduce heat evolution, water demand and cost, were assessed using compressive strength, X-ray diffraction (XRD), scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) spectroscopy on 25 Mg, 27 Al, 29 Si, 31 P and 39 K nuclei. We present the first definitive evidence that dissolution of the glassy aluminosilicate phases of both FA and GBFS occurred under the pH conditions of MKPC. In addition to the main binder phase, struvite-K, an amorphous orthophosphate phase was detected in FA/MKPC and GBFS/MKPC systems. It was postulated that an aluminium phosphate phase was formed, however, no significant Al-O-P interactions were identified. High-field NMR analysis of the GBFS/MKPC system indicated the potential formation of a potassium-aluminosilicate phase. This study demonstrates the need for further research on these binders, as both FA and GBFS are generally regarded as inert fillers within MKPC.

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“…However, it is equivalent to struvite, Mg(NH 4 )PO 4 ⋅ 6H 2 O, that has been well studied (see sources such as Webmineral or Wikipedia). Recently, Postl et al [27] and Graeser et al [28] recognized this equivalence and studied the product, MgKPO 4 ⋅ 6H 2 O, in detail. It has an orthorhombic colorless structure and now is known in mineralogical literature as K-struvite.…”

Section: Role Of Solution Chemistry and Thermodynamics In Formation Omentioning

confidence: 99%

Recent Progress in Chemically Bonded Phosphate Ceramics

Wagh

2013

ISRN Ceramics

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Chemically bonded phosphate ceramics have made an excellent progress in the last 10 years and are poised to be one of the major inorganic room-temperature setting materials for nuclear, structural, dental, and prosthetic applications. They are also poised to be the first inorganic industrial coatings for fire and corrosion protection applications. In 2004 the author in his book, Chemically Bonded Phosphate Ceramics, presented general theory, compositions, methods of fabrication, and preliminary commercial products that appeared in the market ten years ago. This paper reviews that background and presents advances of last ten years with an emphasis on the recent applications in the nuclear field.

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Struvite-(K), KMgPO46H2O, the potassium equivalent of struvite a new mineral

Cited by 115 publications

References 2 publications

Growth and characterization of Struvite‐K crystals

Growth and characterization of Struvite‐K crystals

Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

Recent Progress in Chemically Bonded Phosphate Ceramics

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