Effects of mechanical activation on physicochemical properties and alkaline leaching of boron concentrate

2017 ◽  
Vol 173 ◽  
pp. 32-42 ◽  
Author(s):  
Yingzhe Xu ◽  
Tao Jiang ◽  
Mi Zhou ◽  
Jing Wen ◽  
Wanying Chen ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Mechanical Activation ◽  
Alkaline Leaching

Correlations between Milling Conditions and B2O3 Activity of Mechanically Activated Boron Concentrate

2019 ◽  
Vol 294 ◽  
pp. 79-85
Author(s):  
Ying Zhe Xu ◽  
Tao Jiang ◽  
Hui Yang Gao ◽  
Xiang Xin Xue
Keyword(s):  
Crystal Structure ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Surface Area ◽  
Specific Surface Area ◽  
Filling Ratio ◽  
Mass Ratio ◽  
Alkaline Leaching ◽  
Pretreatment Method ◽  
Leaching Solution

Facing the current inefficiency of boron extraction from boron concentrate, this paper used mechanical activation as a pretreatment method to improve the extraction of B2O3 from boron concentrate, and researched the influences of milling conditions, including the ball-sample mass ratio, the diameter of milling ball, and filling ratio of chamber, on the B2O3 activity. The changes in the properties of the milled products were investigated to analyze the mechanism of activation. These three milling conditions all affected the B2O3 activity more or less, as evidenced by the changes of B2O3 activity with these milling factors. Under optimized milling conditions, the B2O3 activity could be enhanced from 67.52% of the non-activated boron concentrate to 85.01%. The results also showed that the specific surface area increased and the crystal structure was damaged, which accelerated the reaction between the alkaline leaching solution and boron concentrate samples and enhanced the B2O3 activity of the samples.

Effect of mechanical activation on the physicochemical properties of piroxicam with chitosan

2003 ◽  
Vol 13 (1) ◽  
pp. 3-5 ◽  
Author(s):  
Galina L. Ivashchenko ◽  
Tatiana P. Shakhtshneider ◽  
Vladimir V. Boldyrev ◽  
Natalia G. Bazarnova ◽  
Alevtina S. Medvedeva ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Mechanical Activation

Influence of mechanical activation on the alkaline leaching of enargite concentrate

2000 ◽  
Vol 54 (2-3) ◽  
pp. 205-216 ◽  
Author(s):  
P. Baláž ◽  
M. Achimovičová ◽  
Z. Bastl ◽  
T. Ohtani ◽  
M. Sánchez
Keyword(s):  
Mechanical Activation ◽  
Alkaline Leaching

scholarly journals Influence Different Methods of Mechanical Activation on Yield Extractive Substances from Pine Bark

2020 ◽  
pp. 430-446
Author(s):  
Evgenia V. Veprikova ◽  
Vladislav A. Ionin ◽  
Mikhail Yu. Belash ◽  
Andrei M. Skripnikov ◽  
Aleksandr V. Levdanskii ◽  
...  
Keyword(s):  
Hydrochloric Acid ◽  
Physicochemical Properties ◽  
Mechanical Activation ◽  
Ball Mill ◽  
Mechanical Treatment ◽  
Alkali Solution ◽  
Pine Bark ◽  
Extractive Substances ◽  
Pectin Substances

The effect pine bark activation by explosive autohydrolysis and mechanical treatment in a ball mill on the yield and properties of resinous and pectin substances and β-sitosterol was studied. Pine bark physicochemical properties after its activation by a batch of methods were studied. It was shown that the activation of pine bark by explosive autohydrolysis result in the highest increase in the yield of extractive substances. The conditions providing the highest yield of target products from the activated pine bark were determined: for resinous substances and β-sitosterol – the use of 0.5 n alkali solution; for pectin substances – the use of hydrochloric acid

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

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