scholarly journals Treatment of fly ash from power plants using thermal plasma

2017 ◽  
Vol 8 ◽  
pp. 1043-1048 ◽  
Author(s):  
Sulaiman Al-Mayman ◽  
Ibrahim AlShunaifi ◽  
Abdullah Albeladi ◽  
Imed Ghiloufi ◽  
Saud Binjuwair
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fly Ash ◽  
Thermal Plasma ◽  
Inductively Coupled Plasma ◽  
Power Plants ◽  
Plasma Reactor ◽  
Atomic Emission ◽  
Inductively Coupled ◽  
Scanning Electron

Fly ash from power plants is very toxic because it contains heavy metals. In this study fly ash was treated with a thermal plasma. Before their treatment, the fly ash was analyzed by many technics such as X-ray fluorescence, CHN elemental analysis, inductively coupled plasma atomic emission spectroscopy and scanning electron microscopy. With these technics, the composition, the chemical and physical proprieties of fly ash are determined. The results obtained by these analysis show that fly ash is mainly composed of carbon, and it contains also sulfur and metals such as V, Ca, Mg, Na, Fe, Ni, and Rh. The scanning electron microscopy analysis shows that fly ash particles are porous and have very irregular shapes with particle sizes of 20–50 μm. The treatment of fly ash was carried out in a plasma reactor and in two steps. In the first step, fly ash was treated in a pyrolysis/combustion plasma system to reduce the fraction of carbon. In the second step, the product obtained by the combustion of fly ash was vitrified in a plasma furnace. The leaching results show that the fly ash was detoxified by plasma vitrification and the produced slag is amorphous and glassy.

Fast, Clean and Low Damage Deprocessing Using Inductively Coupled and RIE Plasmas

1996 ◽  
Author(s):  
W.E. Vanderlinde ◽  
C.J. Von Benken ◽  
C.M. Davin ◽  
A.R. Crockett
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Integrated Circuits ◽  
Inductively Coupled Plasma ◽  
Etch Rate ◽  
Auger Spectroscopy ◽  
Inductively Coupled ◽  
Reactor Type ◽  
Working Device ◽  
Scanning Electron

Abstract Keeping devices active during deprocessing can be a major frustration for reliability engineers. Reactive ion etching (RIE) provides a rapid, controlled and acid-free method for delayering integrated circuits. However, RIE places a working device directly on a powered electrode, and this can produce surface contamination, charge damage, and waste many man-hours by destroying one-of-a-kind parts. This paper discusses a new reactor type which solves these problems, the inductively coupled plasma (ICP) source. A comparison of etch results (etch rate, surface cleanliness and plasma voltages) was performed in both reactive ion and inductively coupled plasma systems. Scanning electron microscopy (SEM) and surface analysis using scanning Auger spectroscopy were performed. Significant improvements in etch profiles and cleanliness of deprocessing were found.

Analysis of Discolored Aluminum Foil by Laser Ablation Inductively Coupled Plasma Mass Spectrometry and Scanning Electron Microscopy

1998 ◽  
Vol 52 (5) ◽  
pp. 629-637 ◽  
Author(s):  
Alexander I. Yuzefovsky ◽  
Donald E. Miser
Keyword(s):  
Electron Microscopy ◽  
Mass Spectrometry ◽  
Scanning Electron Microscopy ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Aluminum Foil ◽  
Corrosion Process ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Scanning Electron

Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) was employed for the characterization of the elemental composition of discolored areas of thin (50 μm) aluminum foil samples. The spatial distribution of the impurities, which included 11 elements present in the foil material at ppm and ppb levels, was analyzed. Elevated concentrations of almost all studied elements were found in the discolored regions with respect to the nondiscolored regions of the foil. In particular, the difference in the elemental yield observed for iron was approximately 6 to 25 times higher in the discolored regions of the foil. In addition, an elevated level of oxygen was detected in the discolored regions of the sample by the use of scanning electron microscopy with a wavelength-dispersive spectroscopy (SEM-WDS) system. Thus, the elevated levels of iron and oxygen in the same discolored regions of the foil, according to the authors' opinion, strongly indicated the development of a corrosion process within the samples. The discoloration itself was most likely a result of the formation of metal oxide compounds as products of the corrosion process, with iron oxide contributing the yellowish color in the affected areas.

Bausch & Lomb-ARL: Where We Come From, Who We are

1981 ◽  
Vol 35 (2) ◽  
pp. 226-235 ◽  
Author(s):  
Robert L. Eklund
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Inductively Coupled Plasma ◽  
Applied Research ◽  
Optical Emission ◽  
X Ray ◽  
Inductively Coupled ◽  
Scanning Electron ◽  
Alex Haley

Remembering where we came from, points out author Alex Haley in Roots, helps us know who we are today. The roots of spectroscopy are closely intertwined with those of Bausch & Lomb-ARL, known to the industry for more than 45 years as Applied Research Laboratories. A member of Bausch & Lomb's Instrument Group, ARL today is a major multinational supplier of spectrochemical instruments in the optical emission, inductively coupled plasma (ICP), X-ray fluorescence and diffraction, microanalysis, and scanning electron microscopy fields. Its story begins with a graduate student's dream—which, unlike most dreams, came true.

Influence of Fly Ash on Corrosion Resistance of Refractory Forsterite-Spinel Ceramics

2021 ◽  
Vol 325 ◽  
pp. 181-187
Author(s):  
Martin Nguyen ◽  
Radomír Sokolář
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Corrosion Resistance ◽  
Fly Ash ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transition Zones ◽  
Refractory Ceramics ◽  
Scanning Electron

This article examines the influence of fly ash on corrosion resistance of refractory forsterite-spinel ceramics by molten iron as a corrosive medium. Fly ash in comparison with alumina were used as raw materials and sources of aluminium oxide for synthesis of forsterite-spinel refractory ceramics. Raw materials were milled, mixed in different ratios into two sets of mixtures and sintered at 1550°C for 2 hours. Samples were characterized by X-ray diffraction analysis and thermal dilatometric analysis. Crucibles were then made from the fired ceramic mixtures and fired together with iron at its melting point of 1535°C for 5 hours. The corrosion resistance was evaluated by scanning electron microscopy on the transition zones between iron and ceramics. Mixtures with increased amount of spinel had higher corrosion resistance and mixtures with fly ash were comparable to mixtures with alumina in terms of corrosion resistance and refractory properties.

Sign in / Sign up

Export Citation Format

Share Document