Ash Formation from Excluded Minerals Including Consideration of Mineral−Mineral Associations†

2007 ◽  
Vol 21 (2) ◽  
pp. 461-467 ◽  
Author(s):  
Yinghui Liu ◽  
Rajendar Gupta ◽  
Terry Wall
Keyword(s):  
Mineral Associations ◽  
Ash Formation

Improved numerical prediction of ash formation and deposition using a novel developed char fragmentation model

Fuel ◽  
2012 ◽  
Vol 98 ◽  
pp. 103-110 ◽  
Author(s):  
Benjamin Kreutzkam ◽  
Christoph Wieland ◽  
Hartmut Spliethoff
Keyword(s):  
Numerical Prediction ◽  
Fragmentation Model ◽  
Ash Formation

Buffering of CO2 potential by mineral associations

2009 ◽  
Vol 424 (1) ◽  
pp. 68-71
Author(s):  
O. V. Avchenko
Keyword(s):  
Mineral Associations

Modelling Particle Size Distribution of Residual Fly Ash from Pulverized Biomass Combustion

2021 ◽  
Vol 15 (1) ◽  
pp. 75-82
Author(s):  
Mingzi Xu ◽  
Changdong Sheng
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Simple Model ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Particle Shape ◽  
Great Influence ◽  
Biomass Combustion ◽  
Ash Formation ◽  
Residual Ash

The present work aims to develop a simple model for describing the particle size distribution (PSD) of residual fly ash from pulverized biomass combustion. The residual ash formation was modelled considering the mechanism of fragmentation and coalescence. The influences of particle shape and stochastic fragmentation on model description of the PSD of the fly ash were investigated. The results showed that biomass particle shape has a great influence on the model prediction, and a larger fragmentation number is required for cylindrical particles than that for spherical particles to get the same PSD of fly ash, and the fragment number of the particles increases with the shape factor increasing. For pulverized biomass with a wide size distribution, the model predicted ash PSD considering the stochastic fragmentation is very similar to that assuming uniform fragmentation. It implies that the simple model assuming uniform fragmentation is applicable for predicting fly ash size distribution in practical processes where biomass particles have a wide range of sizes. For the fuel with a narrower initial PSD, the stochastic fragmentation model generally predicts a coarser PSD of the residual ash than assuming uniform fragmentation. It means the stochastic fragmentation is of great influence to be considered for accurate description of ash formation from the fuel with a narrow PSD.

Geochemical Features of the Tulallar Gold Ore Field

2021 ◽  
pp. 39-51
Author(s):  
Vasif Mamad Aga oglu Baba-zadeh ◽  
Narmina Nazim kyzy Ismayilova ◽  
Nazim Ajdar oglu Imamverdiyev ◽  
Shakhla Faig kyzy Abdullaeva
Keyword(s):  
Positive Relationship ◽  
Weak Correlation ◽  
Mineral Association ◽  
Mineral Associations ◽  
Western Block ◽  
Mine Workings ◽  
Lesser Caucasus ◽  
Bismuth Tellurides ◽  
Impurity Elements ◽  
Dispersed Gold

The article discusses the geochemical features of the Tulallar gold field in the Lesser Caucasus. Distributions of gold and accompanying elements (Ag, As, Hg, Bi, Cu, Zn) in metasomatically altered rocks taken from mine workings (ditches, adits, etc.) and wells are considered. The results of analyzes of furrow samples showed that the content of Au ranges from 0.4 ppm to 37.5 ppm, Ag - from 0.5 ppm to 48.4 ppm. In strongly kaolinized, weakly limonitized quartzites, the Au content ranged from 0.4 to 1.2 ppm, Ag - from 4.0 to 8.8 ppm. In the well drilled in the Central Block, closer to the surface, the siliceous breccias contain Au 309-363 ppm, Ag 132-250 ppm, and high As, Bi and Hg contents are also noted. A similar picture is observed in the silicified rocks of the wells of the Western block. Correlations between Au, Ag and other impurity elements were determined using the STAT program. A direct positive correlation has been established between Au and Ag, Au and Bi, Au and Hg. A positive relationship was also found between Ag and Bi, Ag and Hg. Cluster analysis revealed two different mineral associations: 1) native elements and their compounds - minerals and 2) polysulfide. The closest connection is observed between Ag, Hg and Au. Mineralogically, the Ag-Hg-Au-Bi cluster apparently corresponds to an early ore association - electrum, bismuth tellurides, possibly with inclusions of finely dispersed gold. The second, polymetallic cluster is characterized by a weak correlation bond Аs-Сu-Zn, which indicates that polysulfides were deposited later. The largest amount of Au was deposited in the early mineral association.

30 лет программе «Байкал-бурение»

2020 ◽  
Keyword(s):  
Gas Hydrates ◽  
Electron Probe ◽  
Isotope Geochemistry ◽  
Global Changes ◽  
Late Cenozoic ◽  
X Ray ◽  
Mineral Associations ◽  
Modern Methods ◽  
Limnological Institute ◽  
Drilling Project

The book is devoted to the International Baikal Drilling Project, a part of the program «Global changes of the environment and climate», accomplished by the Russian, American and Japanese scientists. Much attention is given to the fact that the Baikal Drilling team acted as a single, solid team. The major results obtained from those studies were described in numerous publications published in various Russian and International journals. We hope that the book will be interesting for young scientists, so that they can feel an interest in studying the secrets of nature. The project was accomplished owing to the efforts of M.I. Kuzmin, V.S. Antipin, A.V. Goreglyad, V.F. Geletyi, G.V. Kalmychkov (Institute of Geochemistry, SB RAS), M.A Grachev, O.M. Khlystov (Limnological Institute, SB RAS). Many problems that arouse in the project management were solved with the assistance of V.A. Fialkov, Director of the Baikal Museum, SB RAS, A.A. Bukharov, Vive-Director of the Baikal Museum, and the translators T. V. Bunaeva and M. Yu. Khomutova. The book not only describes a difficult work in the ice of Lake Baikal, but also presents the valuable data on the mineral composition of the bottom sediments, the discovery of Baikal gas hydrates, and the evolution of the landscapes and climate of the Baikal region in the Late Cenozoic. Modern methods of electron-probe x-ray spectral microanalysis and isotope geochemistry are described in detail. All this, as well as the methods of modeling real mineral associations, make this book valuable for researchers in different fields of science.

Development of a modeling approach to predict ash formation during co-firing of coal and biomass

2009 ◽  
Vol 90 (9) ◽  
pp. 1148-1156 ◽  
Author(s):  
V. Doshi ◽  
H.B. Vuthaluru ◽  
R. Korbee ◽  
J.H.A. Kiel
Keyword(s):  
Modeling Approach ◽  
Ash Formation

scholarly journals Crystallization environment of Kazakhstan microdiamond: evidence from nanometric inclusions and mineral associations

2003 ◽  
Vol 21 (5) ◽  
pp. 425-437 ◽  
Author(s):  
L. F. Dobrzhinetskaya ◽  
H. W. Green ◽  
K. N. Bozhilov ◽  
T. E. Mitchell ◽  
R. M. Dickerson
Keyword(s):  
Mineral Associations
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