Experimental study on cesium immobilization in struvite structures

Wagh, Arun S.; Sayenko, S.Yu.; Shkuropatenko, V.A.; Tarasov, Roman Viktorovich; Dykiy, Mikola P.; Svitlychniy, Y.O.; Virych, V.D.; Ulybkina, Е.А.

doi:10.1016/j.jhazmat.2015.09.049

Cited by 86 publications

(19 citation statements)

References 23 publications

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“…The advantages of MKP cements include fast setting [9,26,27], high early strength [9,[27][28][29], low shrinkage [9,29,30], and strong bonding with Portland cement concrete substrates [9,10,31,32]. MKP cements have been used as rehabilitation materials [9,31,32], as stabilization/solidification agents for immobilizing wastes containing heavy metals [33][34][35][36], and been considered as potential binders for conditioning low-level nuclear wastes [3,[37][38][39][40][41][42][43]. Recent research involved also the use in medical technology due to their good biocompatibility and antibacterial properties [44,45].…”

Section: Introductionmentioning

confidence: 99%

Influence of magnesium-to-phosphate ratio and water-to-cement ratio on hydration and properties of magnesium potassium phosphate cements

Winnefeld

Kaufmann

et al. 2019

Cement and Concrete Research

150

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Magnesium-to-phosphate (Mg/PO4) and water-to-cement (w/c) ratios are important 9 factors controlling hydration and properties of magnesium potassium phosphate (MKP) cements.This study investigated the influence of Mg/PO4 molar ratios (2.7, 4 and 8) and w/c (0.25 and 5) on cement hydration, compressive strength and volume stability. Low w/c ratio slowed down cement hydration at lower Mg/PO4 beyond 1 day, and prevented the precipitation of intermediate hydrates at higher Mg/PO4. At lower Mg/PO4 expansion and strength loss were observed with time due to the continuing hydration within the already hardened cement. Higher Mg/PO4 resulted in faster hydration, higher strength, and in the precipitation of traces of brucite, which had no significant influence on the long-term volume stability and strength. Therefore, moderate Mg/PO4 molar ratios between 4 and 8 depending on w/c ratio used are recommended for the production of MKP cements with robust performance.

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Section: Introductionmentioning

confidence: 99%

Influence of magnesium-to-phosphate ratio and water-to-cement ratio on hydration and properties of magnesium potassium phosphate cements

Winnefeld

Kaufmann

et al. 2019

Cement and Concrete Research

150

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“…Previously, we and other researchers demonstrated [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ] that magnesium potassium phosphate (MKP) compound based on the MgKPO 4 × 6H 2 O matrix obtained as a result of the reaction (1), which is an analog of the natural mineral K-struvite [ 17 ], is a promising low-temperature material for the immobilization of various RW types. MgO + KH 2 PO 4 + 5H 2 O → MgKPO 4 × 6H 2 O …”

Section: Introductionmentioning

confidence: 99%

Magnesium Potassium Phosphate Compound for Immobilization of Radioactive Waste Containing Actinide and Rare Earth Elements

2018

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The problem of effective immobilization of liquid radioactive waste (LRW) is key to the successful development of nuclear energy. The possibility of using the magnesium potassium phosphate (MKP) compound for LRW immobilization on the example of nitric acid solutions containing actinides and rare earth elements (REE), including high level waste (HLW) surrogate solution, is considered in the research work. Under the study of phase composition and structure of the MKP compounds that is obtained by the XRD and SEM methods, it was established that the compounds are composed of crystalline phases—analogues of natural phosphate minerals (struvite, metaankoleite). The hydrolytic stability of the compounds was determined according to the semi-dynamic test GOST R 52126-2003. Low leaching rates of radionuclides from the compound are established, including a differential leaching rate of 239Pu and 241Am—3.5 × 10−7 and 5.3 × 10−7 g/(cm2∙day). As a result of the research work, it was concluded that the MKP compound is promising for LRW immobilization and can become an alternative material combining the advantages of easy implementation of the technology, like cementation and the high physical and chemical stability corresponding to a glass-like compound.

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“…The resulting minerals, as well as the rest of the unreacted components, are physically encapsulated in the matrix of the formed ceramic 17 .…”

Section: Introductionmentioning

confidence: 99%

Chemically-Bonded Magnesium Phosphate Ceramics from Magnesium Oxide-Graphite Refractory Brick Waste

et al. 2021

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In Brazil, the production of each ton of steel generates approximately 621 kg of waste and direct co-products. One of the components that generates a high amount of waste is the refractory material used in the steel process. So, in this study, the possibility of using MgO-C refractory waste from steel casting pots after their deterioration for the formation of chemically bonded phosphate ceramics was investigated. This work aims to study the recovery of industrial solid waste from MgO-C refractories by determining the processing conditions necessary to obtain magnesium phosphate ceramics. Three mean particle size of the waste and three potassium monophosphate:MgO ratio in the mixture were adopted. All mixtures showed the formation of the K-struvite phase and a strong relationship between the compressive strength and porosity properties. The highest compressive strength value obtained, 7.51 ± 0.24 MPa, is sufficient for use in several areas of engineering. It was also possible to statistically represent, using a quadratic model, the variation in porosity in relation to the phosphate content and particle size of the waste, obtaining porosities ranging from 14% to 25%. Taking into account this study used a waste, the evaluation of its environmental impact assumed an important role. The waste showed no appreciable toxicity, while some samples W3-20 showed toxicity to Allium cepa L. and Artemia salina. Considering the presented properties, the obtained material could be used as a structural block, filters, support for catalysts, and repair element for cement-based structures and roadways.

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Experimental study on cesium immobilization in struvite structures

Cited by 86 publications

References 23 publications

Influence of magnesium-to-phosphate ratio and water-to-cement ratio on hydration and properties of magnesium potassium phosphate cements

Influence of magnesium-to-phosphate ratio and water-to-cement ratio on hydration and properties of magnesium potassium phosphate cements

Magnesium Potassium Phosphate Compound for Immobilization of Radioactive Waste Containing Actinide and Rare Earth Elements

Chemically-Bonded Magnesium Phosphate Ceramics from Magnesium Oxide-Graphite Refractory Brick Waste

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