Monitoring of Fluctuations in the Physical and Chemical Properties of a High-Calcium Fly Ash

1987 ◽  
Vol 113 ◽  
Author(s):  
Scott Schlorholtz ◽  
Ken Bergeson ◽  
Turgut Demirel
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Operating Conditions ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Morphological Studies ◽  
High Calcium ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACTThe physical and chemical properties of fly ash produced at Ottumwa Generating Station have been monitored since April, 1985. The fly ash is produced from burning a low sulfur, sub-bituminous coal obtained from the Powder River Basin near Gillette, Wyoming. One-hundred and sixty samples of fly ash were obtained during the two year period. All of the samples were subjected to physical testing as specified by ASTM C 311. About one-hundred of the samples were also subjected to a series of tests designed to monitor the self-cementing properties of the fly ash. Many of the fly ash samples were subjected to x-ray diffraction and fluorescence analysis to define the mineralogical and chemical composition of the bulk fly ash as a function of sampling date. Hydration products in selected hardened fly ash pastes, were studied by x-ray diffraction and scanning electron microscopy. The studies indicated that power plant operating conditions influenced the compressive strength of the fly ash paste specimens. Mineralogical and morphological studies of the fly ash pastes indicated that stratlingite formation occurred in the highstrength specimens, while ettringite was the major hydration product evident in the low-strength specimens.

Preparation and Evaluation of Nano-Hydroxyapatite/β-Tricalcium Phosphate/Chitosan Composite Scaffolds for Bone Tissue Engineering

2007 ◽  
Vol 361-363 ◽  
pp. 463-466
Author(s):  
T. Lin ◽  
S.M. Zhang ◽  
J. Li ◽  
L. Zhang ◽  
Y.H. Liu ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Composite Scaffolds ◽  
X Ray ◽  
Viable Cells ◽  
Physical And Chemical ◽  
Chitosan Composite ◽  
Preparation And Evaluation ◽  
And Chemical Properties

The composite scaffolds with nine different ratios of nano-HA and ß-TCP content were fabricated by using lyophilization method. Their microscopy, physical and chemical properties were investigated by using scanning electron microscopy (SEM), X-ray diffraction (XRD), and fourier transformed infrared (FTIR) spectroscopy. MTT test was applied to quantitatively assess the number of viable cells attached and grown on the scaffolds. And the result showed that the amount of cells on the scaffold containing 30% by mass of nano-HA was significantly higher than the other samples.

scholarly journals Effects of Structural Symmetry on NMR Spectra of 3,9-Diazatetraasteranes

2021 ◽  
Author(s):  
Runzhi Sun ◽  
Xiuqing Song ◽  
Fan Xie ◽  
Huiqin Wang ◽  
Hong Yan
Keyword(s):  
Nmr Spectra ◽  
Chemical Properties ◽  
2D Nmr ◽  
The Self ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Structural Symmetry ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract The structural symmetry is of great significance on the unique physical and chemical properties that closely related to pharmacological applications. To investigate the effects of structural symmetry on the NMR spectra, C2-3,9-diazatetraasteranes and non-C2-3,9-diazatetraasteranes were selected as the research object. They were synthesized by the self-dimerization and cross-dimerization of diethyl 1,4-dihydropyridine-3,5-dicarboxylates, respectively. The differences and similarities in NMR spectra of these two types of 3,9-diazatetraasteranes were discussed by the 1D-NMR and 2D-NMR analysis. The single-crystal X-ray diffraction (XRD) was used to demonstrate directly their structural symmetry.

The Thermal Decomposition Characteristics of Sodium Pyroxenite Gangue in Baiyunebo Iron Ore

2014 ◽  
Vol 887-888 ◽  
pp. 939-946
Author(s):  
Guo Ping Luo ◽  
Sheng Li Wu ◽  
Xiao Long Nie ◽  
Yi Ci Wang ◽  
Yue Cong Wang
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Iron Ore ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Physical And Chemical ◽  
And Chemical Properties

The changes of physical and chemical properties of sodium pyroxenite gangue such as decomposition and phase transformation were researched by means of differential thermal analysis and X-ray diffraction. The results show that the natural sodium pyroxenite gangue contains the main mineral of aegirite(NaFe+3Si2O6), and it contains a number of BaSO4 and Na3Ca2(SO4)3F, etc. The water of crystallization decomposes at 554.7°C. The Na3Ca2(SO4)3F decomposes into the composite sulfate and CaF2 over a wide range of temperatures. The main mineral of aegirite(NaFe+3Si2O6) reacts with CaF2 into NaF gas at 993.4°C. The sodium pyroxenite gangue is melts and releases a small amount of SiF4 gas in the range of 1193.5-1300.7°C.

Stabilization Characteristics of Clays Using Class C Fly Ash

1998 ◽  
Vol 1611 (1) ◽  
pp. 46-54 ◽  
Author(s):  
Anil Misra
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Clay Soils ◽  
Statistical Characteristics ◽  
Oxide Content ◽  
Physical And Chemical Properties ◽  
High Calcium ◽  
Class C ◽  
Physical And Chemical ◽  
And Chemical Properties

Coal-burning utilities using subbituminous coal from Wyoming typically produce fly ash, which, because of its high calcium oxide content, may be classified as Class C fly ash. These ashes are characterized by their self-cementing property and therefore can be used for soil improvement. Stabilization characteristics of clay soils blended with Class C fly ash were evaluated. Because fly ash is a by-product, uniformity of its physical and chemical properties is significant for quality control. The statistical characteristics of fly ash physical and chemical properties are obtained and compared with the data in literature. Fly ash is blended with several different clay soils of varying plasticity to study moisture-density relationships and strength behavior of stabilized soils. It is observed that the fly ash used in these experiments has a rapid hydration characteristic. Consequently, higher densities and strengths are achieved when the compaction is performed with little or no delay after the addition of moisture to clay-fly ash blends. Conversely, delayed compaction produces low densities and strength. In addition, it is observed that the stabilization characteristics are closely related to the soil mineral type and plasticity. Results also are presented for strength gain behavior with curing period for the various soil-fly ash blends.

Physical and Chemical State of the Concrete Piers of the Former Franz Joseph Bridge Built in 1891

2016 ◽  
Vol 691 ◽  
pp. 297-308
Author(s):  
Ivan Janotka ◽  
Peter Paulík ◽  
Patrik Ševčík ◽  
Michal Bačuvčík
Keyword(s):  
Mercury Intrusion Porosimetry ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mercury Intrusion ◽  
Elasticity Module ◽  
European Standards ◽  
Physical And Chemical ◽  
And Chemical Properties

This article discusses the properties of concrete within the piers of the Old Bridge in Bratislava (former Franz Joseph Bridge). It was the first permanent bridge across the river Danube in Bratislava as well as within the present territory of Slovakia. Mechanical, physical and chemical properties were verified on core drills, some of them being almost 23 m long. The concretes were tested for dynamic and Young’s elasticity module and compressive strengths. Subsequently the fines of concrete specimens were studied by the X-ray diffraction, TG-DTA and mercury intrusion porosimetry techniques and also by chemical analyses and SEM observations. The piers were made from 5 different concrete kinds. The concrete in the caissons and in the piers does not fulfil the criteria for structural concrete defined in the present European standards. This finding seriously suggests that carrying capacity of the piers after the reconstruction of the bridge, without any strengthening would become questionable.

Recovery of Zinc from Municipal Solid Waste Incineration Fly Ash

2021 ◽  
Vol 13 (5) ◽  
pp. 956-965
Author(s):  
Chen-Piao Yen ◽  
Yun-Hwei Shen ◽  
Kai-Lun Chiu ◽  
Hsin-Hsiang Huang
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Acid Leaching ◽  
Physical And Chemical Properties ◽  
Water Leaching ◽  
X Ray ◽  
Msw Incineration ◽  
Physical And Chemical ◽  
Target Metal ◽  
And Chemical Properties

In recent years, over one million tons of Municipal Solid Waste (MSW) incineration fly ash has been generated annually Taiwan. Only a small percentage of the ash was used as raw material for other utilities besides landfill. Fly ash contains many harmful heavy metals, such as Cd and Cr, among others; however, fly ash also contains many valuable metals, including as Zn, Pb, and Ga.To recover Zn from fly ash, in this work, an experiment was first designed to determine the physical and chemical properties of the fly ash. Then, treatment processes, including water leaching, acid leaching, and ion exchange were conducted.Test samples were subjected to scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray fluorescence spectrometer (XRF), and atomic absorption spectroscopy (AAS) to determine their physical and chemical properties. Then, water leaching was conducted under optimal experimental conditions. Thereafter, acid leaching was performed using two different acids (hydrochloric and sulfuric) to extract the target metal ions, and finally the ion exchange process was deployed to concentrate and recover the target metal ions.Ultimately, an optimal process to recover zinc from MSW incineration fly ash was developed in this work. An aqueous solution containing approximately 1 wt% zinc was obtained by leaching with sulfuric acid. Zn was then concentrated using a chelating resin IRC-747 in column mode.

scholarly journals Liquid Phase Nitration of Benzene Catalyzed by a Novel Salt of Molybdovanadophosphoric Heteropolyacid

2021 ◽  
Author(s):  
Jianan Liu ◽  
Yanan Wang ◽  
Shuwen Gong ◽  
Wenzeng Duan ◽  
Xianqiang Huang
Keyword(s):  
Chemical Properties ◽  
Reaction Medium ◽  
Catalytic Performance ◽  
Reusable Catalyst ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Physical And Chemical ◽  
And Chemical Properties

A highly efficient and reusable catalyst QA-HPMV was successfully prepared by the reaction of quinoline-2-formic acid (QA) with molybdovanadophosphoric heteropolyacid (H4PMo11VO40, HPMV) for the nitration of benzene. The physical and chemical properties of the sample was characterized by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis and thermogravimetric analysis (TG). The characterization results showed that the formed QA-HPMV retained the Keggin structure of HPMV. As a catalyst for benzene nitration, QA-HPMV showed good catalytic performance and the yield of nitrobenzene was 82.5% under the optimized reaction conditions. As a heterogeneous catalyst, QA-HPMV can be easily recycled from the reaction medium by filtering and remained highly catalytic performance even after five runs of recycling.

Study on Thermal Physical and Chemical Properties of Sodium Pyroxenite in Baiyunebo Iron Ore

2011 ◽  
Vol 194-196 ◽  
pp. 185-189
Author(s):  
Yue Cong Wang ◽  
Yi Ci Wang ◽  
Guo Ping Luo ◽  
Guang Jie Zhang ◽  
Qian Bing Lu
Keyword(s):  
Iron Ore ◽  
Chemical Properties ◽  
Calcium Ferrite ◽  
Physical And Chemical Properties ◽  
X Ray Diffraction ◽  
Complex Calcium ◽  
X Ray ◽  
Melting Temperatures ◽  
Physical And Chemical ◽  
And Chemical Properties

A typical kind of silicate gangue — sodium pyroxenite (mainly containing NaFeSi2O6) in Baiyunebo iron ore is selected as the research object in this paper. The endothermic peak and the change of quality is definited by means of thermal analysis (DSC and TG) in the rising process. And then the samples are sintered at the peak temperatures. The main ingredients of sodium pyroxenite and the resultants are definited by means of X-ray diffraction analysis (XRD). The experiment ascertains the change law of physical and chemical properties of sodium pyroxenite such as thermal decomposition, softening, melting temperatures and the corresponding resultants, which provides basic data for exploring the formation mechanism of complex calcium ferrite (SFCA) in baogang special sintered ore.

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