Group optical basicity of sodium borate and sodium silicate glasses

2016 ◽  
Vol 57 (6) ◽  
pp. 285-290
Author(s):  
Vesselin Dimitrov ◽  
◽  
Tina Tasheva ◽  
Takayuki Komatsu ◽  
Keyword(s):  
Sodium Silicate ◽  
Optical Basicity ◽  
Silicate Glasses ◽  
Sodium Borate

Leaching Studies of Cement-Glass Package Containing Sodium Borate

1986 ◽  
Vol 84 ◽  
Author(s):  
Masahiro Okamoto ◽  
Koichi Chino ◽  
Tsutomu Baba ◽  
Tatsuo Izumida ◽  
Fumio Kawamura ◽  
...  
Keyword(s):  
Sodium Silicate ◽  
Liquid Waste ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
X Ray Diffraction ◽  
Adsorption Ability ◽  
Pressurized Water ◽  
X Ray ◽  
Solidification Reaction ◽  
Main Components

AbstractA new solidification technique using cement-glass, which is a mixture of sodium silicate, cement, additives, and initiator of the solidification reaction, was developed for sodium borate liquid waste generated from pressurized water reactor (PWR) plants. The cement-glass could solidify eight times as much sodium borate as cement could, because the solidifying reaction of the cement-glass is not hindered by borate ions.The reaction mechanism of sodium silicate and phosphoric silicate (initiator), the main components of cement-glass, was studied through X-ray diffraction and compressive strength measurements. It was found that three- dimensionally bonded silicon dioxide was produced by polymerization of the two silicates. The leaching ratio of cesium from the cement-glass package was one-tenth that of the cement one. This low value was attributed to a high cesium adsorption ability of the cement-glass and it could be theoretically predicted accordingly.

Phase Separation and Spatial Morphology in Sodium Silicate Glasses by AFM, Light Scattering and NMR

2013 ◽  
Vol 96 (8) ◽  
pp. 2454-2460 ◽  
Author(s):  
Abbas Hodroj ◽  
Patrick Simon ◽  
Pierre Florian ◽  
Marie-Hélène Chopinet ◽  
Yann Vaills
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
Sodium Silicate ◽  
Silicate Glasses ◽  
Spatial Morphology

scholarly journals Unconventionally Made-Cellular Glass Aggregate

2021 ◽  
Vol 2 (6) ◽  
pp. 21-31
Author(s):  
Lucian Paunescu ◽  
Sorin Mircea Axinte ◽  
Felicia Cosmulescu
Keyword(s):  
Calcium Carbonate ◽  
Sodium Silicate ◽  
Electromagnetic Waves ◽  
Microwave Field ◽  
Industrial Processes ◽  
Sodium Borate ◽  
Residual Glass ◽  
Cellular Glass ◽  
Glass Aggregate ◽  
Fluxing Agent

Improving the original manufacturing process in microwave field of a cellular glass aggregate using a recipe containing colored consumed drinking bottle, calcium carbonate (CaCO3) as an expanding agent, sodium borate (borax) as a fluxing agent and sodium silicate (Na2SiO3) as a binder is shown in the work. The main adopted technological measures were the advanced mechanical processing of residual glass at a grain dimension below 100 μm and especially the use of a high electromagnetic wave susceptible ceramic tube with a wall thickness reduced from 3.5 to 2.5 mm for the protection of the pressed glass-based mixture against the aggressive effect of microwave field and, in the same time, to achieve a preponderantly direct heating with electromagnetic waves. Of the tested variants, a recipe with 1.6 % calcium carbonate, 6 % borax, 8 % sodium silicate and the rest residual glass was determined to be optimal. The cellular glass aggregate had the bulk density of 0.22 g/cm3, heat conductivity of 0.079 W/m·K and compression strength of 5.9 MPa. The specific consumption of energy was very low (0.71 kWh/kg) below the range of reported values of the industrial processes consumption (between 0.74-1.15 kWh/kg).  

scholarly journals Effect of Al2O3, MgO, and CuOx on the dissolution behavior of rhodium in the Na2O-SiO2 slags

2013 ◽  
Vol 49 (2) ◽  
pp. 131-138 ◽  
Author(s):  
C. Wiraseranee ◽  
T. Yoshikawa ◽  
T.H. Okabe ◽  
K. Morita
Keyword(s):  
High Temperature ◽  
Thermodynamic Properties ◽  
Activity Coefficient ◽  
Sodium Silicate ◽  
Slag Composition ◽  
Slag Basicity ◽  
Optical Basicity ◽  
Dissolution Behavior ◽  
Recycling Process ◽  
Oxide Addition

Aiming to optimize rhodium recovery in the high temperature recycling process by minimizing rhodium loss into slags in an oxidizing atmosphere by controlling slag composition, the effects of representative slag components, such as Al2O3, MgO, and CuOx, on the dissolution behavior of rhodium into the Na2O-SiO2 slags was investigated. The solubility of rhodium was measured by equilibrating the sodium silicate based slags with pure solid rhodium at 1473 K in air. Considering that rhodium dissolved into slags as RhO1.5, the effect of the oxide addition on the activity coefficient of RhO1.5 in slags was determined. The dissolution of rhodium in slags was suppressed by the addition of Al2O3 and MgO, where Al2O3 behaved as an acidic oxide and MgO behaved as a diluent of slag basicity at a fixed Na2O/SiO2 ratio of 0.97. The content of copper in solid rhodium equilibrated with the CuOx bearing slags slightly increased with increasing content of CuOx, and CuOx was found to slightly enhance the dissolution of rhodium. Rhodate capacity of all slag systems increased with increasing optical basicity, suggesting that the correlation between rhodate capacity and the optical basicity enables the estimation of the content of rhodium in slags of which thermodynamic properties of rhodium are not clarified.

Effect of Oxidation State of Iron on Phase Separation in Sodium Silicate Glasses

2004 ◽  
Vol 84 (8) ◽  
pp. 1859-1864 ◽  
Author(s):  
Jun-Sik Jeoung ◽  
W. Howard Poisl ◽  
Michael C. Weinberg ◽  
Gary L. Smith ◽  
Hong Li
Keyword(s):  
Phase Separation ◽  
Oxidation State ◽  
Sodium Silicate ◽  
Silicate Glasses
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