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.

Development of Cement Solidification Process for Sodium Borate Waste Generated From PWR Plants

2013 ◽  
Author(s):  
Hirofumi Okabe ◽  
Tatsuaki Sato ◽  
Yuichi Shoji ◽  
Yoshiko Haruguchi ◽  
Masaaki Kaneko ◽  
...  
Keyword(s):  
Liquid Waste ◽  
Solidification Process ◽  
High Volume ◽  
Silica Sand ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
High Mechanical Strength ◽  
Cement Solidification ◽  
Tetraborate Decahydrate

A cement solidification process for treating sodium borate waste produced in pressurized water reactor (PWR) plants was studied. To obtain high volume reduction and high mechanical strength of the waste, simulated concentrated borate liquid waste with a sodium / boron (Na/B) mole ratio of 0.27 was dehydrated and powdered by using a wiped film evaporator. To investigate the effect of the Na/B mole ratio on the solidification process, a sodium tetraborate decahydrate reagent with a Na/B mole ratio of 0.5 was also used. Ordinary portland cement (OPC) and some additives were used for the solidificaiton. Solidified cement prepared from powdered waste with a Na/B mole ratio 0.24 and having a high sillica sand content (silica sand/cement>2) showed to improved uniaxial compressive strength.

Electron Microscopy of Human Gallstones

1971 ◽  
Vol 29 ◽  
pp. 296-297
Author(s):  
C. Wolpers ◽  
R. Blaschke
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Bile Pigment ◽  
X Ray Diffraction ◽  
Triclinic Crystal System ◽  
X Ray ◽  
Follow Up Study ◽  
Infra Red ◽  
Main Components

Scanning microscopy was used to study the surface of human gallstones and the surface of fractures. The specimens were obtained by operation, washed with water, dried at room temperature and shadowcasted with carbon and aluminum. Most of the specimens belong to patients from a series of X-ray follow-up study, examined during the last twenty years. So it was possible to evaluate approximately the age of these gallstones and to get information on the intensity of growing and solving.Cholesterol, a group of bile pigment substances and different salts of calcium, are the main components of human gallstones. By X-ray diffraction technique, infra-red spectroscopy and by chemical analysis it was demonstrated that all three components can be found in any gallstone. In the presence of water cholesterol crystallizes in pane-like plates of the triclinic crystal system.

scholarly journals Investigation of Adsorption Behavior of Cu2O Submicro-Octahedra towards Congo Red

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Xu Zhang ◽  
Ying Zhang ◽  
Dong Wang ◽  
Fengyu Qu
Keyword(s):  
Cuprous Oxide ◽  
Congo Red ◽  
Adsorption Behavior ◽  
X Ray Diffraction ◽  
Adsorbed Species ◽  
Adsorption Ability ◽  
Chemical Additive ◽  
X Ray ◽  
Short Time ◽  
Facile Route

Perfect cuprous oxide (Cu2O) nanocrystals with octahedron shape were successfully synthesized by a facile route without chemical additive in a short time. The products were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The adsorption ability of the products towards congo red (CR) as the pollutant was investigated and FTIR spectroscopy was employed to identify the adsorbed species. The adsorption behavior was analyzed based on the microstructure of Cu2O submicro-octahedra.

scholarly journals Effects of sodium roasting on the leaching rate of boron-bearing tailings and its mechanism analysis

2018 ◽  
Vol 5 (8) ◽  
pp. 172342
Author(s):  
Chengxi Zou ◽  
Zhenyu Tang ◽  
Wei Xie ◽  
Hanguang Fu ◽  
Jiacai Kuang ◽  
...  
Keyword(s):  
Scientific Basis ◽  
Raw Material ◽  
Sodium Borate ◽  
Mechanism Analysis ◽  
Leaching Rate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Roasting Process ◽  
Roasting Temperature ◽  
Theoretical Amount

The study reported was intended to improve the leaching rate of boron-bearing tailings, using a method of sodium roasting that uses boron-bearing tailings as the raw material and Na 2 CO 3 as the sodium agent. The effects of the roasting temperature and Na 2 CO 3 amount on the leaching rate of boron-bearing tailings are mainly evaluated. The morphology and composition of the samples after sodium roasting are analysed by scanning electron microscopy and X-ray diffraction. The results show that sodium roasting can significantly improve the leaching rate of boron-bearing tailings. Under the optimal conditions where roasting temperature is 950°C, Na 2 CO 3 amount is five times the theoretical amount and roasting time is 2 h, the leaching rate of boron-bearing tailings is up to 86.78%. Based on the analysis of the characterization results and the mechanism analysis of the sodium roasting process, the main reason for the increase of leaching rate is the reaction between Na 2 O produced by the decomposition of Na 2 CO 3 and the boron in boron-bearing tailings resulting in soluble sodium borate. The results provide a scientific basis for the efficient comprehensive use of boron-bearing tailings.

Physical and optical properties of sodium borate glasses doped with Dy3+ ions

2017 ◽  
Vol 31 (23) ◽  
pp. 1750171 ◽  
Author(s):  
Y. S. M. Alajerami ◽  
K. M. Abushab ◽  
S. I. Alagha ◽  
M. H. A. Mhareb ◽  
A. Saidu ◽  
...  
Keyword(s):  
Physical Properties ◽  
Oscillator Strengths ◽  
Sodium Borate ◽  
Blue Color ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
Hypersensitive Transition ◽  
X Ray ◽  
Yellow Color ◽  
Polaron Radius

The photoluminescence, optical and physical properties of sodium borate (NB) doped with different concentrations of Dy[Formula: see text] were determined and well discussed. The samples were prepared by the melt-quenching technique and characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Photoluminescence and absorption spectra of NB glasses doped with different concentrations of Dy[Formula: see text] are reported. Ten absorption bands with hypersensitive transition at 1272 nm ([Formula: see text] [Formula: see text][Formula: see text]) and two emission bands for the transitions at [Formula: see text] [Formula: see text][Formula: see text] (blue color) and [Formula: see text] [Formula: see text][Formula: see text] (yellow color) with an excitation of 330 nm have been recorded. A series of considerable physical properties (oscillator strengths, refractive index, ions concentration, polaron radius) was calculated for each dopant concentration.

Stability of Cement-Glass Packages Containing Sodium Borate Salt Generated from Pressurized Water Reactor Power Plants

1987 ◽  
Vol 78 (2) ◽  
pp. 185-190 ◽  
Author(s):  
Tatsuo Izumida ◽  
Fumio Kawamura ◽  
Koichi Chino ◽  
Makoto Kikuchi
Keyword(s):  
Power Plants ◽  
Reactor Power ◽  
Sodium Borate ◽  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
Water Reactor

scholarly journals Phase and chemical composition analysis of pigments used in Cucuteni Neolithic painted ceramics

2007 ◽  
Vol 34 ◽  
pp. 281-288 ◽  
Author(s):  
Bogdan Constantinescu ◽  
Roxana Bugoi ◽  
Emmanuel Pantos ◽  
Dragomir Popovici
Keyword(s):  
Manganese Oxides ◽  
Mineralogical Composition ◽  
Composition Analysis ◽  
X Ray Diffraction ◽  
Trade Routes ◽  
X Ray ◽  
Manganese Minerals ◽  
Chemical Composition Analysis ◽  
Main Components ◽  
Phase And Chemical Composition

Two analytical methods – 241Am-based X-Ray Fluorescence (XRF) and Synchrotron Radiation X-ray Diffraction (SR-XRD) – were used to investigate the elemental and mineralogical composition of pigments which decorate some Cucuteni Neolithic ceramic sherds. Local hematite and local calcite were the main components for red and white pigments, respectively. For black pigments, iron oxides (e.g. magnetite) were used. They were often mixed with manganese oxides (e.g. jacobsite), which originated from Iacobeni manganese minerals deposits on the Bistrita River. Taking into account the results of the experiments, several conclusions regarding manufacturing procedures employed, and potential trade routes during the Neolithic were drawn.

scholarly journals OPTIMIZATION OF CONDITION ION Cu2+ ELECTRODEPOSITION IN ELECTROPLATING LIQUID WASTE WITH FORMALDEHYDE AS REDUCING AGENT

2017 ◽  
Vol 5 (1) ◽  
pp. 66
Author(s):  
Siti Marwati ◽  
Regina Tutik Padmaningrum
Keyword(s):  
Liquid Waste ◽  
Atomic Absorption Spectrophotometry ◽  
Reducing Agent ◽  
Maximum Efficiency ◽  
Formaldehyde Concentration ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrodeposition Time ◽  
Optimum Ph

Abstract The aims of this research to determine of the optimum of formaldehyde concentration, teh optimum of electrodeposition time and the optimum pH of solution. In addition, this research also   aims to determine the character Cu deposite at optimum operational. The sample in this research was used   real electroplating liquid waste from Kotagede Yogyakarta.done at various formaldehyde concentration Electrodeposition was done at various formaldehyde concentration, electrodeposition time and varoius of pH. The optimum conditions could be seen  the  maximum efficiency. It could be obtained by measuring the final concentration of Cu2+ after electrodeposition process by  Atomic absorption spectrophotometry. The character of deposit could be seen by  visual and X-ray Diffraction. The result  of this research showed that the optimum of formaldehyde concentration as reducing  agent was 0.3 M. the optimum time was 4 hours and the optimum of  pH 9. The character of deposte was contained  Cu deposite and more subtle than deposite which electrodeposited without formaldehyde. Keywords: electrodeposition, formaldehyde, reducing agent

Sign in / Sign up

Export Citation Format

Share Document