Synthesis of Coal Dust Depressor and its Application in Preventing Coal Dust

2012 ◽  
Vol 482-484 ◽  
pp. 2301-2306 ◽  
Author(s):  
Fang Qin Cheng ◽  
Shu Yan Cheng ◽  
Yan Xia Guo ◽  
Li Qiong Cao
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Coal Dust ◽  
Raw Material ◽  
Surface Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stock Pile ◽  
Scanning Electron

A novel coal dust depressor was prepared by alkalization and etherficayion reactions using wastepaper as raw material. The sample was characterized by means of FTIR spectroscopy (FTIR)、scanning electron microscopy (SEM)、X-ray diffraction (XRF) and viscometer measurements. The coal dust inhibitor was developed to suppress flying dust over coal dump and conveyor. The result shows that flying coal dust was prevented by intrinsic viscosity of coal dust depressor which was sprayed on the surface stock pile can make the surface material bond with each other to form layer of crust, having a role of dust prevention. Application of the coal dust depressor can reduce the losses of coal and protect the environment from being polluted.

Preliminary Preparation and Characterization Studies of Cellulose from Merbau (Intsia bijuga)

2012 ◽  
Vol 620 ◽  
pp. 314-319
Author(s):  
Nur Amira Mamat Razali ◽  
Fauziah Abdul Aziz ◽  
Saadah Abdul Rahman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Alkaline Treatment ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preliminary Preparation ◽  
Characterization Studies ◽  
Scanning Electron

Hardwood is wood from angiosperm trees. The characteristic of hardwood include flowers, endosperm within seeds and the production of fruits that contain the seeds. This paper aims to discuss the preparation and characterization of cellulose obtained from hardwood. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Alkaline treatment and delignification methods were used for the preparation of cellulose. Acid hydrolysis was employed to produce cellulose nanocrystal (CNC). The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The final product, from both trated and untreated samples were then compared.

Effect of Zn on the intermetallics formation and reliability of Sn-3.5Ag solder on a Cu pad

2007 ◽  
Vol 22 (7) ◽  
pp. 1879-1887 ◽  
Author(s):  
Y.K. Jee ◽  
Y.H. Ko ◽  
Jin Yu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Isothermal Aging ◽  
X Ray Diffraction ◽  
X Ray ◽  
Drop Tests ◽  
Joint Microstructures ◽  
Role Of Zn ◽  
Scanning Electron

Varying amounts of Zn (1, 3, and 7 wt%) were added to Sn–3.5Ag solder on a Cu pad, and the resultant solder joint microstructures after a reflow and isothermal aging (150 °C, up to 500 h) were investigated using scanning electron microscopy, energy dispersive x-ray, and x-ray diffraction, which were subsequently correlated to the results of microhardness and drop tests. Zinc was effective in improving the drop resistance of Sn–3.5Ag solder on the Cu pad, and an addition of 3 wt% Zn nearly doubled the number of drops-to-failure (Nf). The beneficial role of Zn was ascribed to suppression of Cu6Sn5 and precipitation of Zn-containing intermetallic compounds (IMCs). However, the Zn effect was reduced as Cu6Sn5 and Ag3Sn precipitated in a joint IMC layer after prolonged aging. The interface between Ag5Zn8 and Cu5Zn8 was resistant to drop impact, but two other layered IMC structures of Cu6Sn5/Cu3Sn and Cu5Zn8/Cu6Sn5 were not.

Structural and morphological features of MgO powders. The key role of the preparative starting compound

1998 ◽  
Vol 13 (8) ◽  
pp. 2218-2223 ◽  
Author(s):  
S. Ardizzone ◽  
C. L. Bianchi ◽  
B. Vercelli
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Specific Surface ◽  
Surface Area ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Starting Compound ◽  
Scanning Electron

The present paper reports data concerning magnesia samples obtained by calcination of different precursor salts at different increasing temperatures (873–1253 K). The oxides are characterized by x- ray diffraction, scanning electron microscopy, and N2 adsorption at subcritical temperatures. The samples appear to be composed, at any temperature, of pure periclase with a degree of crystallinity which increases with the temperature of calcination. Morphologically, the products have the shape either of lamellas or of cubes of variable dimensions, depending on the nature and route of preparation of the precursor salts. The variation of the specific surface area and the degree of porosity with the nature of the precursors and the temperature is discussed.

Prepared of Flower-Like CuO via CTAB-Assisted Hydrothermal Method

2010 ◽  
Vol 152-153 ◽  
pp. 909-914 ◽  
Author(s):  
Yun Ling Zou ◽  
Yan Li ◽  
Nan Zhang ◽  
Jian Gang Li
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrothermal Method ◽  
Cetyltrimethylammonium Bromide ◽  
Raw Material ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Scanning Electron

Flower-like CuO nanostructures have been prepared via cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. Here, CuCl2•2H2O was used as copper raw material, and sodium hydroxide was used as precipitate. The resulting CuO powders were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). X-ray diffraction (XRD) pattern exhibited the nanocrystalline nature with monoclinic structure for the as-synthesized nanostructures. FESEM images indicated that the flower-like CuO nanostructures are composed of many interconnected nanosheets in size of several micrometers in length and width and 60-80 nm in thickness. The possible formation mechanism of flower-like CuO nanostructures was discussed.

scholarly journals The Role of Chemical Substitutions on Bi-2212 Superconductors

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 462 ◽  
Author(s):  
Riccardo Cabassi ◽  
Davide Delmonte ◽  
Muna Mousa Abbas ◽  
Ali Razzak Abdulridha ◽  
Edmondo Gilioli
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Critical Temperature ◽  
High Temperature Superconductor ◽  
X Ray Diffraction ◽  
Structural Morphology ◽  
X Ray ◽  
Critical Temperature Tc ◽  
Scanning Electron

We present a study on the correlation of the superconducting critical temperature (Tc) and structural morphology with a chemically substituted high-temperature superconductor (HTS) (Bi,Pb)-2212 via Powder X-ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and d c magnetometry. The elements Zn, Y, Ti, and Nd are incorporated within the bismuth cuprate structure at amounts that extend the ranges currently found in literature.

Crystallinity and Morphological of Cellulose Extraction from Elaeis guineensis Jacquin Frond

2015 ◽  
Vol 819 ◽  
pp. 251-255
Author(s):  
M. Muhammad Safwan ◽  
Hui Lin Ong ◽  
Hazizan Md Akil
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Field Emission ◽  
Microcrystalline Cellulose ◽  
Elaeis Guineensis ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bleaching Treatment ◽  
Scanning Electron

The work described in this paper is the extraction of microcrystalline cellulose from Elaeis Guineensis Jacquin Frond using alkaline and bleaching treatment. Microcrystalline cellulose extracted has been characterized by X-Ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM). Morphological investigation of fibers was performed using field emission scanning electron microscopy (FESEM) where rod like fiber can be observed. Crystallinity of cellulose extracted was found higher than raw material.

scholarly journals Preliminary studies on hydrothermal synthesis of zeolite from Malaysian kaolinite clays

2019 ◽  
Vol 15 (3) ◽  
pp. 421-425 ◽  
Author(s):  
Tijjani Abdullahi ◽  
Zawati Harun ◽  
Mohd Hafiz Dzarfan Othman ◽  
Khairul Nazri Yusof ◽  
Ainun Rahmawati ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Peninsular Malaysia ◽  
Processing Method ◽  
Raw Material ◽  
Synthesis Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Geological Origin ◽  
Scanning Electron

The use of kaolin as a source of silica and alumina for synthesis of zeolite has been widely reported with various compositions and processing routes. However, since kaolin is highly influenced by geological origin and geographical formation, coupled with the processing method, two different crude kaolin were obtained at various locations in Peninsular Malaysia to serve as precursor for synthesis of zeolite. Hydrothermal treatments were made at reasonable low temperature of 90°C in an oven. The synthesized product was then analyzed using X-ray diffraction and scanning electron microscopy, to evaluate the potentials of the process and the product. The outcome of the analysis suggested that the breaking down of the clay structure and the armophization process can improve raw material reactivity. However, the crystallinity and composition of the crude kaolin together with appropriate incubation time can greatly influence the synthesis process and the product.

scholarly journals Investigation of Viscose Rayon Manufacturing Sludges, Considered as a Raw Material for Zinc Production

2017 ◽  
Vol 2 (2) ◽  
pp. 182
Author(s):  
S.V. Mamyachenkov ◽  
O.S. Anisimova ◽  
V.V. Egorov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Size ◽  
Viscose Rayon ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zinc Production ◽  
Zinc Dissolution ◽  
Scanning Electron

<p>At treatment of wastewater of viscose rayon’s spinning produces the sediment – zinc-bearing sludge, a humidity content of 66 to 95 %. To date, it is deposited up to 2.5 million cubic meters of zinc-bearing sludge in the ponds of plants in Russia. In the paper chemical composition and particle size distribution of sludge of viscose rayon manufacturing (OJSC “Balakovskoye khimvolokno”, OJSC “Ryazanskoye khimvolokno”, OJSC “Sibvolokno”) are presented. The percentage of zinc in sludge is of 6 to 23 %. Investigations by methods of X-ray diffraction (XRD) and scanning electron microscopy (SEM) are shown, that zinc is present in form of hydroxides, carbonates and silicates. Thermodynamic analysis of zinc dissolution of compounds, found in product of sludge roasting at a temperature of 850ºС, was conducted.</p>

Identification of calcium oxalate crystals in dried or fixed tobacco leaf

1984 ◽  
Vol 42 ◽  
pp. 288-289
Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Calcium Oxalate ◽  
Growth And Development ◽  
Polarized Light ◽  
Calcium Oxalate Crystals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Scanning Electron

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.

Environmental scanning electron microscopy of fresh human gallstones reveals new morphologies of precipitated calcium salts

1992 ◽  
Vol 50 (2) ◽  
pp. 1322-1323
Author(s):  
Howard S. Kaufman ◽  
Keith D. Lillemoe ◽  
John T. Mastovich ◽  
Henry A. Pitt
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Environmental Scanning Electron Microscopy ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Calcium Salts ◽  
Cholesterol Gallstones ◽  
X Ray ◽  
Ca Carbonate ◽  
Scanning Electron

Gallstones contain precipitated cholesterol, calcium salts, and proteins. Calcium (Ca) bilirubinate, palmitate, phosphate, and carbonate occurring in gallstones have variable morphologies but characteristic windowless energy dispersive x-ray (EDX) spectra. Previous studies of gallstone microstructure and composition using scanning electron microscopy (SEM) with EDX have been limited to dehydrated samples. In this state, Ca bilirubinates appear as either glassy masses, which predominate in black pigment stones, or as clusters, which are found mostly in cholesterol gallstones. The three polymorphs of Ca carbonate, calcite, vaterite, and aragonite, have been identified in gallstones by x-ray diffraction, however; the morphologies of these crystals vary in the literature. The purpose of this experiment was to study fresh gallstones by environmental SEM (ESEM) to determine if dehydration affects gallstone Ca salt morphology.Gallstones and bile were obtained fresh at cholecystectomy from 6 patients. To prevent dehydration, stones were stored in bile at 37°C. All samples were studied within 4 days of procurement.

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