Solidification of Glass Powder with Simulated High‐Level Radioactive Waste During Hydrothermal Hot‐Pressing

Nishioka, Mamoru; Hirai, Shoji; Yanagisawa, Kazumichi; Yamasaki, Nakamichi

doi:10.1111/j.1151-2916.1990.tb06512.x

Cited by 21 publications

(8 citation statements)

References 12 publications

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“…14 usually are hard to be attained for industrial productions with low cost. Hydrothermal hot-pressing combining of a subsequent calcination at 700 • C is another kind of hydrothermal methods for preparing porous materials from used glass powders at relatively low hydrothermal temperatures less than 300 • C. 20,21 A low density of 0.4 g/cm 3 for porous columns with a size less than 4 cm-scale were prepared using much fine glass powders with grain size in the range of 39-45 m in the laboratory scale. 22 However, the large scalepreparation is hard to achieve because of the limitation of a low production efficiency of hydrothermal hot-pressing instruments.…”

Section: Introductionmentioning

confidence: 99%

Development of a technique to prepare porous materials from glasses

Yanagisawa¹,

Bao²,

Shen³

et al. 2006

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Development of a technique to prepare porous materials from glasses

Yanagisawa¹,

Bao²,

Shen³

et al. 2006

Journal of the European Ceramic Society

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“…Alteration of thermal treatment coupled with a coldpressing step could perhaps produce denser monolithic forms [17]. It is also possible that some sort of hot-pressing step will be required to form dense monoliths from the gels [3,4,18].…”

Section: Resultsmentioning

confidence: 99%

Sol-Gel Processing of Silica Nuclear Waste Glasses

Deptula¹,

Miłkowska²,

Łada³

et al. 2011

NJGC

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A complex Sol-Gel process has been used for synthesis of silica glasses designed to contain high-level nuclear wastes. Cs, Sr, Co, and Nd (generically denoted Me) were used, the last as surrogate for actinides. Gels in the form of powders and sintered compacts were prepared by hydrolysis and polycondensation of tetraethoxide/Me nitrate solutions, which contained ascorbic acid as a catalyst. Thermal treatment studies were conducted on the resulting gels. Transformation to final products was studied by thermogravimetric analysis, infrared spectroscopy, and X-ray diffraction. Preliminary testing of Me leaching was also completed in quiescent water. Only a single dense form was resistant to leachin

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“…In general, the vast research work conducted last two decades on the HAp low-temperature powder densification. It has been based on the hydrothermal reaction kinetics principals and mechanisms [37][38][39], which were determined for various inorganic [40][41][42][43][44] and organic [45] powders at temperatures in the range of 100 -300 ºC that reacted with water and alkaline medium under HHP conditions. Likewise, a new technology for sintering ceramic materials named as hydrothermal-assisted cold sintering process has recently been proposed, which involves hydrothermal reaction fundamentals in a broad variety of aqueous solutions [46].…”

Section: Microstructural Aspects and Mechanical Strength Of Mgha Compmentioning

confidence: 99%

Low-temperature densification of Mg-doped hydroxyapatite fine powders under hydrothermal hot processing conditions

Montoya-Cisneros

Rendón-Ángeles

Matamoros-Veloza

et al. 2017

Ceramics International

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Abstract:Densification of calcium hydroxyapatite fine powders doped with different concentrations of Mg (2, 4 and 6 mol % Mg, MgHA) was successfully achieved for the first time in a nearly fully dense state using the 2 hydrothermal hot pressing (HHP) technique at low temperatures. Consolidation of MgHA powders was studied under different temperatures (150-240 ºC), reaction times (1-6 h), and powder particle size (20 nm-1.5 m). X-Ray diffraction analyses indicated that the particle densification under HHP conditions proceeded without any variation in the crystalline structure and regardless of the Mg content. The results from this work showed that an increase in temperature accelerates the reaction between MgHA particles and water (solvent) mixed during the hydrothermal treatment. Particle packing associated with bulk densification was achieved through a massive dissolution-recrystallisation mechanism, which induced the formation of small particles that rapidly crystallised on the surface of the partially dissolved original MgHA particles. The optimum conditions to obtain pellets with a high apparent density of 3.0758 ± 0.001 g/cm 3 and tensile strength value of 12.6 ± 0.6 MPa were 10 wt% of water at a temperature of 240 ºC with a 6 h reaction time and 6 mol % of Mg (MgHA3). The use of the HHP technique coupled with the fine particle size and reactivity of the MgHA precursor powders with water allowed us to produce disks that were compacted to a nearly full dense state with a low content of open porosity of 2.0 %.

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Solidification of Glass Powder with Simulated High‐Level Radioactive Waste During Hydrothermal Hot‐Pressing

Cited by 21 publications

References 12 publications

Development of a technique to prepare porous materials from glasses

Development of a technique to prepare porous materials from glasses

Sol-Gel Processing of Silica Nuclear Waste Glasses

Low-temperature densification of Mg-doped hydroxyapatite fine powders under hydrothermal hot processing conditions

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