The role of alkaline activation in the structural transformations of aluminosiliceous industrial wastes towards zeolite production

2019 ◽  
Vol 21 ◽  
pp. 100624 ◽  
Author(s):  
Jorge D. Monzón ◽  
Maximiliano R. Gonzalez ◽  
Lucas E. Mardones ◽  
María S. Conconi ◽  
Andrea M. Pereyra ◽  
...  
Keyword(s):  
Structural Transformations ◽  
Industrial Wastes ◽  
Alkaline Activation ◽  
Zeolite Production

Mineral transformations

2000 ◽  
Vol 64 (2) ◽  
pp. 155-156 ◽  
Author(s):  
S. A. T. Redfern
Keyword(s):  
European Union ◽  
Chemical Composition ◽  
Structural Transformations ◽  
Atomic Scale ◽  
Special Session ◽  
The European Union ◽  
Mineral Science ◽  
Research Programmes ◽  
Mineral Transformations

One of the major goals of mineral science is attaining an understanding of the atomic-scale mechanisms and dynamics of minerals that control their structural transformations as a function of pressure, temperature or chemical composition in the natural environment. Examples of research programmes that sail under this heading include those devoted to observing and modelling the role of phase transformations on controlling mineral microstructures, ordering, elasticity, transport, premelting and exsolution. The geological relevance and intrinsic importance (as being representative of specific properties or thermodynamic/ kinetic behaviour) of mineral transformations has long been appreciated. It prompted the recent initiation of a network on Mineral Transformations (http://www.esc.cam.ac.uk/mintrans/) under the European Union TMR Programme. In response to this development, a special session on Mineral Transformations was held at the EUG congress in Strasbourg last year.

Phonons in deformable microporous crystalline solids

2019 ◽  
Vol 234 (7-8) ◽  
pp. 513-527 ◽  
Author(s):  
Bogdan Kuchta ◽  
Filip Formalik ◽  
Justyna Rogacka ◽  
Alexander V. Neimark ◽  
Lucyna Firlej
Keyword(s):  
Periodic Structures ◽  
Structural Transformations ◽  
Crystalline Solids ◽  
Predictive Tool ◽  
Crystalline Materials ◽  
Numerical Tools ◽  
Collective Vibrations ◽  
First Time

Abstract Phonons are quantum elastic excitations of crystalline solids. Classically, they correspond to the collective vibrations of atoms in ordered periodic structures. They determine the thermodynamic properties of solids and their stability in the case of structural transformations. Here we review for the first time the existing examples of the phonon analysis of adsorption-induced transformations occurring in microporous crystalline materials. We discuss the role of phonons in determining the mechanism of the deformations. We point out that phonon-based methodology may be used as a predictive tool in characterization of flexible microporous structures; therefore, relevant numerical tools must be developed.

scholarly journals Indigenous Education in Environmental Management and Conservation in Ghana: The Role of Folklore

2016 ◽  
Vol 7 (1) ◽  
pp. 37 ◽  
Author(s):  
Martin Q. Amlor ◽  
Matthew Q. Alidza
Keyword(s):  
Physical Environment ◽  
Indigenous Education ◽  
Surface Mining ◽  
Industrial Wastes ◽  
Natural Environments ◽  
Environmental Threats ◽  
Research Findings ◽  
Management And Conservation ◽  
Unconventional Methods

<p>Studies into indigenous knowledge of African societies and their eco-system<strong>,</strong> and complemented by western research findings in recent years, point to a common fact that there is a complex interrelation between humans, animals, plants and their physical environment For this reason, Ghanaian societies enforce cultural laws that ensure protection and management of their natural resources. Despite the merits associated with African endowed natural environments, it is scary to note that to date, Ghana still faces serious environmental threats among which are: deforestation, annual bushfires, illegal surface mining, poor farming practices, unconventional methods of dumping human/industrial wastes and pollution of water bodies. This paper therefore attempts to investigate the causes of environmental degradation in Ghana and demonstrate how the people’s folklore can contribute to ensuring a well-conserved environment that can benefit the country’s present and future generations. </p>

The Role of Industrial Waste in the Formation of the Structure and Properties of Effective Wall Ceramics

2018 ◽  
Vol 931 ◽  
pp. 578-582
Author(s):  
Natalia D. Yatsenko ◽  
N.A. Vil'bitskaya ◽  
A.I. Yatsenko
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Industrial Waste ◽  
Building Materials ◽  
Raw Materials ◽  
Industrial Wastes ◽  
Structure And Properties ◽  
Innovative Technologies ◽  
Furnace Slag

The article deals with the use of blast furnace slag and mineralising additives as raw materials for the production of building materials. Innovative technologies of brick production from natural raw materials and industrial wastes are developed.

scholarly journals Structural Transformations Versus Hard Particles Motion in the Brass Ingots

2017 ◽  
Vol 62 (4) ◽  
pp. 2461-2467 ◽  
Author(s):  
W. Wołczyński ◽  
A.A. Ivanova ◽  
P. Kwapisiński ◽  
E. Olejnik
Keyword(s):  
Continuous Casting ◽  
Thermal Gradient ◽  
Structural Transformations ◽  
Gradient Field ◽  
Hard Particles ◽  
Columnar Grains ◽  
Solid Liquid ◽  
Equiaxed Grains ◽  
Structural Zones

AbstractA mathematical method for the forecast of the type of structure in the steel static ingot has been recently developed. Currently, the method has been applied to structural zones prediction in the brass ingots obtained by the continuous casting. Both the temperature field and thermal gradient field have been calculated in order to predict mathematically the existence of some structural zones in the solidifying brass ingot. Particularly, the velocity of theliquidusisotherm movement and thermal gradient behavior versus solidification time have been considered. The analysis of the mentioned velocity allows the conclusion that the brass ingots can evince: chilled columnar grains-, (CC), fine columnar grains-, (FC), columnar grains-, (C), equiaxed grains zone, (E), and even the single crystal, (SC), situated axially. The role of the mentioned morphologies is analyzed to decide whether the hard particles existing in the brass ingots can be swallowed or rejected by the solid / liquid (s/l) interface of a given type of the growing grains. It is suggested that the columnar grains push the hard particles to the end of a brass ingot during its continuous casting.

Role of sawdust in the removal of copper(II) from industrial wastes

1998 ◽  
Vol 32 (10) ◽  
pp. 3085-3091 ◽  
Author(s):  
Mohammed Ajmal ◽  
Akhtar Hussain Khan ◽  
Shamim Ahmad ◽  
Anees Ahmad
Keyword(s):  
Industrial Wastes

Alkaline activation of metakaolinite-silica mixtures: Role of dissolved silica concentration on the formation of geopolymers

2017 ◽  
Vol 43 (15) ◽  
pp. 12641-12650 ◽  
Author(s):  
Maroua Glid ◽  
Isabel Sobrados ◽  
Hafsia Ben Rhaiem ◽  
Jesús Sanz ◽  
Abdeslem Ben Haj Amara
Keyword(s):  
Dissolved Silica ◽  
Alkaline Activation ◽  
Silica Concentration

SRET Visualisation of Pyrite Corrosion and its Inhibition in Aerated Solution

2008 ◽  
Vol 587-588 ◽  
pp. 1008-1013
Author(s):  
L.P.S. Araújo ◽  
Diogo M.F. Santos ◽  
César A.C. Sequeira
Keyword(s):  
Atmospheric Oxygen ◽  
Reference Electrode ◽  
Industrial Wastes ◽  
Inhibiting Effect ◽  
Electrode Technique

In this work, the Scanning Reference Electrode Technique (SRET) was used to visualise the pyrite corrosion by atmospheric oxygen and its inhibition by a thymol derivative. SRET has the advantage over the potentiostatic and galvanostatic techniques of enabling in situ operation without imposing any potential or current to the sample under study. SRET revealed that the inhibiting effect is effective only if the sample is oxidised beforehand. It also revealed that pyrite corrosion by oxygen is a localised process whereas that by Fe(III) is not local, thus the oxidation of pyrite by atmospheric oxygen is not only due to the oxidative role of Fe(III). Adsorption of oxygen plays probably a determining role. Studies are now carried on to evidence the intervention of galvanic processes or catalysis phenomena occurring during the corrosion of natural conducting minerals and industrial wastes. Their aim is to better understand the mechanisms and to propose remediation processes.

scholarly journals Structural Transformations and Their Precursors

1983 ◽  
Vol 36 (4) ◽  
pp. 553 ◽  
Author(s):  
TR Finlayson
Keyword(s):  
Thermal Expansion ◽  
Electron Diffraction ◽  
Physical Properties ◽  
Elastic Constants ◽  
Direct Evidence ◽  
Indirect Evidence ◽  
Structural Transformations ◽  
X Ray ◽  
Kinetics Of

For a number of materials which exhibit a change of structure on being cooled below a certain temperature Tm, some physical properties display anomalous behaviour at temperatures above Tm. The particular structural transformations in mind have been broadly classified as 'martensitic' and the anomalous physical properties as 'precursive phenomena'. Some debate exists regarding the role of the precursive phenomenon in the kinetics of the structural transformation. The most direct evidence for 'martensite precursors' is obtained from electron diffraction, although various indirect evidence is contained in X-ray, neutron and y-ray diffraction and various physical properties, for example, elastic constants and thermal expansion. In this paper current understanding of 'martensite precursors' is reviewed and examples of data from the A15 structure compounds V 3Si and Nb3Sn,. In-TI and TiNi alloys are discussed.

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