CALL US

+86 17838360708

magnesium potassium phosphate cements to immobilize

magnesium potassium phosphate cements to immobilize

(PDF) Magnesium potassium phosphate cements to immobilize ...

Magnesium potassium phosphate cements to immobilize radioactive concrete wastes generated by decommissioning of nuclear power plants January 2021 Nuclear Engineering and Technology 53(7)

get price

Magnesium potassium phosphate cements to immobilize ...

1 1 2 3 Magnesium potassium phosphate cements to immobilize 4 radioactive concrete wastes generated by decommissioning 5 of nuclear power plants 6 7 8 9 Jae-Young Pyo ...

get price

Prospective usage of magnesium potassium phosphate cement ...

Jan 15, 2021  Magnesium potassium phosphate cement (MC) and biochar (BR) potentials to immobilize Pb were assessed. • Among the sole and other ratios, blend of BR and MC (50:50) had profitable role. • The lowest Pb uptake in spinach shoots and roots was at BR50%+MC50% treatment. • Pb immobilization index in the soil was the highest with BR50%+MC50 ...

get price

Calorimetric study of magnesium potassium phosphate cement ...

Sep 09, 2011  10%  The thermal behavior of magnesium potassium phosphate cement (MKPC) during the early reaction period has been monitored by isothermal conduction calorimetry at 298 K. It is found that the typical heat evolution curve of the MKPC hydration has one endothermic valley and two distinct exothermic peaks. It is believed that the endothermic valley corresponds to the dissolution of potassium ...

get price

Stabilization Using Phosphate Bonded Ceramics

alternative to cement grouting. One alternative is low-temperature stabilization by chemically bonded phosphate ceramics (CBPCs). The process involves reacting magnesium oxide with monopotassium phosphate with the salt waste to produce a dense monolith as shown in Figure 1.

get price

Solidification/stabilization of Pb2+ and Zn2+ in the ...

In order to exhaustively investigate the physical and chemical mechanisms of heavy metal immobilization in sludge incineration residue (SIR)-based magnesium potassium phosphate cement (MKPC), this work investigated the influence of Pb2+ and Zn2+ on the compressive strength and microstructure of SIR-based MKPC, and the efficiency of Pb and Zn ...

get price

Reaction Mechanisms of Magnesium Potassium Phosphate ...

Magnesium potassium phosphate cement (MKPC) is a kind of cementitious binder in which the chemical bond is formed via a heterogeneous acid-base reaction between dead burned magnesia powder and potassium phosphate solution at room temperature. Small amount of boron compounds can be incorporated in the cement as a setting retarder. The final reaction product of MgO-KH2PO4-H 2O

get price

Stabilization Using Phosphate Bonded Ceramics

alternative to cement grouting. One alternative is low-temperature stabilization by chemically bonded phosphate ceramics (CBPCs). The process involves reacting magnesium oxide with monopotassium phosphate with the salt waste to produce a dense monolith as shown in Figure 1.

get price

PROPERTIES OF MAGNESIUM BASED CEMENTS 1, A SCOTT ,

to cement) ratio was 0.4 while the sand to cement ratio was 1 for the mortar samples. 3% superplasticizer, by mass of binder, was added to improve the workability. In terms of the magnesium phosphate cement, the ratio of magnesium to phosphate was 4:1 with a w/c ratio of 0.18.

get price

US20160122244A1 - Magnesium phosphate cement - Google

Magnesium phosphate cement binder systems and method for providing magnesium phosphate cements are described. In an embodiment, a magnesium phosphate cement binder system may include magnesium oxide that has been calcined at a temperature of between about 900° F. to about 1800° F. The magnesium phosphate cement binder system may also include a phosphate material.

get price

Porous Materials Prepared by Magnesium Phosphate Cement ...

May 17, 2021  Magnesium phosphate cement (MPC) is a typical inorganic non-metallic material that shares both cement and ceramics properties. It can be synthesized by an acid–base neutralization reaction between magnesia (MgO) and KH 2 PO 4 (Buj, et al. 2010 ; Haque and Chen 2019 ; Wagh 2016a , b ; Zhenyu, et al. 2019 ).

get price

한국원자력학회 - kns

Jun 17, 2021  Magnesium potassium phosphate cements to immobilize radioactive concrete wastes generated by decommissioning of nuclear power plants Pages 2261-2267 Jae-Young Pyo, Wooyong Um, Jong Heo Topology optimization of tie-down structure for transportation of

get price

Effects of K-struvite on hydration behavior of magnesium ...

Increasing the amount of final hydration products of magnesium potassium phosphate cements (MKPC) can improve its mechanical properties and increase its application diversity. This work investigates the influence of the MgKPO46H2O (K-struvite) on the hydration behavior and mechanisms of MKPC with Mg/P ratio of 6 at w/c ratio of 0.3. The results indicate the number of exothermic peaks ...

get price

Publications 광전자유리재료연구실

Jae-Young Pyo, Wooyong Um and Jong Heo “Magnesium potassium phosphate cements to immobilize radioactive concrete wastes generated by decommissioning of nuclear power plants”, ... (BORATE GLASS WASTEFORM TO IMMOBILIZE RARE-EARTH OXIDES FROM PYRO-PROCESSING AND MANUFACTURING METHOD THEREOF)

get price

US6153809A - Polymer coating for immobilizing soluble ions ...

A polymer coating is applied to the surface of a phosphate ceramic composite to effectively immobilize soluble salt anions encapsulated within the phosphate ceramic composite. The polymer coating is made from ceramic materials, including at least one inorganic metal compound, that wet and adhere to the surface structure of the phosphate ceramic composite, thereby isolating the soluble salt ...

get price

Review on Cement Stabilization/Solidification of Municipal ...

3.2. Phosphate Cement. Magnesium phosphate cement was also used to immobilize MSWI fly ash, the reason of which was not only the alkalescence of potassium phosphate cement with the characteristic of dense structure and high strength, but also the widespread use of phosphate

get price

[PDF] Engineering-Scale Demonstration of DuraLith and ...

Magnesium potassium phosphate cements to immobilize radioactive concrete wastes generated by decommissioning of nuclear power plants Jae-Young Pyo , Wooyong Um , J. Heo Materials Science

get price

US Patent for Magnesium phosphate cement Patent (Patent ...

Jan 12, 2016  Magnesium phosphate cement binder systems and method for providing magnesium phosphate cements are described. In an embodiment, a magnesium phosphate cement binder system may include magnesium oxide that has been calcined at a temperature of between about 900° F. to about 1800° F. The magnesium phosphate cement binder system may also include a phosphate

get price

Reaction mechanism of magnesium potassium phosphate cement ...

Feb 15, 2015  In this study, reaction mechanisms of MKP cements with a high magnesium-to-phosphate (Mg/PO{sub 4}) molar ratio of 8 were investigated at two different water-to-solid (w/s) ratios of 0.5 and 5. The experimental findings show that the use of this high Mg/PO{sub 4} molar ratio suppresses the formation of potassium-free magnesium phosphate hydrates.

get price

Prospective usage of magnesium potassium phosphate cement ...

Combining biochar (BR) with other immobilizing amendments has additive effects on Pb immobilization and been recognized to be effective for the restoration of Pb polluted soils. However, the impacts of different proportions between BR and a highly efficient Pb immobilizing agent called "magnesium potassium phosphate cement (MC)" have never been earlier investigated.

get price

Reaction mechanism of magnesium potassium phosphate cement ...

Feb 15, 2015  In this study, reaction mechanisms of MKP cements with a high magnesium-to-phosphate (Mg/PO{sub 4}) molar ratio of 8 were investigated at two different water-to-solid (w/s) ratios of 0.5 and 5. The experimental findings show that the use of this high Mg/PO{sub 4} molar ratio suppresses the formation of potassium-free magnesium phosphate hydrates.

get price

Effect of on the Immobilization of High-Level Waste with ...

Abstract. For the proposed novel procedure of immobilizing HLW with magnesium potassium phosphate cement (MKPC), Fe 2 O 3 was added as a modifying agent to verify its effect on the solidification form and the immobilization of the radioactive nuclide. The results show that Fe 2 O 3 is inert during the hydration reaction. It slows down the hydration reaction and lowers the heat release rate of ...

get price

Influence of lead on stabilization/solidification by ...

This paper investigates the influences of soluble Pb species on the hydration process of two types of inorganic binders: ordinary Portland cement (OPC) and magnesium potassium phosphate cement (MKPC). The environmental leachability, compressive strength, and setting time of the cement products are assessed as the primary performance indicators.

get price

Effect of Waste Glass on the Properties and Microstructure ...

The purpose of this study is to evaluate the effect of glass powder (GP) on the mechanical and working properties of magnesium potassium phosphate cement (MKPC). Moreover, a 40mm × 40mm × 40mm mold was used in this experiment, the workability, setting time, strength, hydration heat release, porosity, and microstructure of the specimens were ...

get price

Magnesium potassium phosphate matrices for immobilization ...

May 28, 2009  Physicochemical properties of magnesium potassium phosphate (MPP) matrices for conservation of highly saline high-level liquid wastes (HLW) after their solidification at room temperature were studied comprehensively. The matrices showed high chemical stability to leaching of radionuclides and other components at various temperatures. The leaching indices of 239Pu, 237Np, 241Am, Sr,

get price

Review on Cement Stabilization/Solidification of Municipal ...

3.2. Phosphate Cement. Magnesium phosphate cement was also used to immobilize MSWI fly ash, the reason of which was not only the alkalescence of potassium phosphate cement with the characteristic of dense structure and high strength, but also the widespread use of phosphate

get price

SYNTHESIS OF ADVANCED CHEMICALLY BONDED CERAMICS

immobilize wastes. In this context, this paper presents and briefly discusses the preliminary results of synthesis for the formation of CBPC. 2. MATERIALS AND METHODS 2.1 Raw-Material Magnesium oxide (MgO) from Magnesita Co., and potassium dihydrogen phosphate (KH2PO4 or KDP), from Fosmix Co. have the chemical compositions presented in Tables 1 ...

get price

Effect of water content on microstructure and properties ...

Jan 25, 2021  Magnesium potassium phosphate cement (MKPC) is a class of chemically bonded ceramic for special engineering applications. The selection of mass ratios of MgO-to-KH 2 PO 4 (M/P) and water-to-cement (W/C) is an important aspect for formulating MKPC paste.This paper analyzed the stoichiometry of the primary reaction of MKPC and investigated the effect of W/C (0.14–0.40) on paste

get price

Polymer coating for immobilizing soluble ions in a ...

6. The phosphate ceramic encapsulation system according to claim 1, wherein the phosphate ceramic composite comprises a phosphate of a compound selected from the group consisting of magnesium, magnesium-ammonium, magnesium-potassium, magnesium-sodium, aluminum, calcium, iron, zinc, and zirconium. 7.

get price

Magnesium Phosphate Cement – Torus Dome

Dec 15, 2015  MPC – Magnesium Phosphate Cement. Use flyash = 40% of total binder (less or more lower strength) gave higher compressive strength than without flyash! Phosphate form MAP – mono ammonium phosphate P MKP – mono potassium phosphate P MgO – Magnesium Oxide M H2O – Potable water w. Binder b M/P ratio = 10 keep in range 10-16

get price

ReviewArticle - Hindawi

Aug 08, 2018  2−, and then generate insoluble phosphate pre-cipitation containing Pb. Moreover, the heavy metals could be encapsulated securely because of compact re-ticular structure of magnesium phosphate cement, in which the radioactive elements can be solidified effec-tivelyaswell[24–26].AndtheheavymetalssuchasPb,

get price

Enhancing the mechanical properties and cytocompatibility ...

Dec 03, 2020  Therefore, some researchers have utilized potassium dihydrogen phosphate (KH 2 PO 4) as a more suitable phosphate source to avoid ammonia emission, with the final hydration product regarded as magnesium potassium phosphate cement (K-struvite) [16, 17].

get price

Effect of Fine Aggregates on Properties of Magnesium ...

Oct 10, 2017  This paper aims to investigate the effect of fine aggregates on properties of magnesium potassium phosphate cement (MKPC) mortar. River sand (RS), limestone sand (LS), and mixed aggregates (RS/LS mixture) were used to prepare MKPC mortar, respectively.

get price