Mechanical Activation of Processing of Egyptian Wolframite

2015 ◽  
pp. 193-208
Author(s):  
Aly M. Abdel-Rehim ◽  
Mohamed Y. Bakr
Keyword(s):  
Mechanical Activation

Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

2019 ◽  
pp. 20-26
Keyword(s):  
Mechanical Activation ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Silicon Oxide ◽  
Rice Husk Ash ◽  
Pozzolanic Activity ◽  
Maximum Solubility ◽  
Laboratory Conditions ◽  
Before And After ◽  
Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

The Influence of Mechanical Activation on Hydrogen Absorption by Intermetallic Compound LaNi2.5Co2.4Mn0.1

2020 ◽  
Vol 94 (5) ◽  
pp. 1007-1010
Author(s):  
P. A. Konik ◽  
E. A. Berdonosova ◽  
E. V. Meshcheryakova ◽  
S. N. Klyamkin
Keyword(s):  
Intermetallic Compound ◽  
Mechanical Activation ◽  
Hydrogen Absorption

scholarly journals Mechanochemistry of fluoride solids: from mechanical activation to mechanically stimulated synthesis

ChemTexts ◽  
2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Gudrun Scholz
Keyword(s):  
Mechanical Activation ◽  
Mechanochemical Synthesis ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Technical Equipment ◽  
Metal Compounds ◽  
Potential Applications ◽  
The Given ◽  
Mechanochemical Reactions

Abstract This lecture text is focused on the comparatively young field of mechanochemistry of fluoride solids, considering both their mechanical activation and their mechanochemical synthesis. Beside a literature survey, the mechanochemical synthesis of binary fluorides MF2, MF3, of complex fluorides MMgF4, of solid solutions MaxMb1−xF2 or M1−xLnxF2+x (Ln: Y, Eu) and of fluorine-containing coordination polymers is presented. Owing to their interesting potential applications in the field of fluoride ion conductivity or luminescence properties when doped, most of the given examples are alkaline earth metal compounds. A short historical survey, remarks on peculiarities and consequences of mechanical activation as well as the necessary technical equipment for mechanochemical reactions precede the section. Graphic abstract

The influence of mechanical activation on the structure of a ZrO2(MgO) nanocrystalline powder

2018 ◽  
Author(s):  
Yu. A. Mirovoy ◽  
A. Yu. Gusev ◽  
A. S. Buyakov ◽  
A. G. Burlachenko ◽  
S. P. Buyakova
Keyword(s):  
Mechanical Activation ◽  
Nanocrystalline Powder
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