scholarly journals Physico-chemical properties of silicon dioxides obtained by extraction from sulfuric acid solutions from acid decomposition of nepheline

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 48-53
Author(s):  
Yu. O. Velyaev ◽  
◽  
D. V. Maiorov ◽  
Keyword(s):  
Sulfuric Acid ◽  
Specific Surface ◽  
Surface Properties ◽  
Chemical Properties ◽  
Acid Solutions ◽  
Microporous Structure ◽  
Acid Decomposition ◽  
Destructive Effect ◽  
Physico Chemical ◽  
Sulfuric Acid Solutions

The synthesis of silica was carried out by extraction from a silica-containing solution from the decomposition of nepheline using acetone and ethanol, followed by gelatinization of the organic phase. The structural and surface properties of the obtained sample of SiO2 were studied and the pH of the isoionic point of their surface was determined. It was found that the use of extraction does not have a destructive effect on the specific surface of the SiO2 xerogel and allows preserving its original microporous structure.

Mineralogical and physico-chemical characteristics of Cameroonian smectitic clays after treatment with weakly sulfuric acid

Clay Minerals ◽  
2015 ◽  
Vol 50 (5) ◽  
pp. 649-661 ◽  
Author(s):  
J.R. Mache ◽  
P. Signing ◽  
J.A. Mbey ◽  
A. Razafitianamaharavo ◽  
D. Njopwouo ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Structural Modification ◽  
Morphological Characteristics ◽  
Textural Properties ◽  
Exchange Capacity ◽  
Acid Solutions ◽  
Acid Attack ◽  
Physico Chemical ◽  
Dioctahedral Smectite ◽  
Sulfuric Acid Solutions

AbstractSmectitic clays from the Sabga and Bana areas, western Cameroon were treated with sulfuric-acid solutions of various concentrations – 0.5, 0.7, 1.0 and 4.0 N – at 80°C for 2 h. The mineralogical, physicochemical and morphological characteristics of the samples treated were analysed using several techniques. The sulfuric acid caused structural modification of the dioctahedral smectite. The accessory minerals such as cristobalite, quartz, feldspars and anatase remained unaltered by the acid attack. The supernatant solutions after acid treatment contain Mg, Ca, K, Na, Si, Al and Fe as a result of partial dissolution of octahedral and tetrahedral cations. The activated clay samples exhibited a smaller cation exchange capacity (CEC) and the specific surface area (SSA) increased with increasing concentration of sulfuric acid, ranging from 65 to 134 m2/g for the sample from Bana and from 74 to 84 m2/g for the sample from Sabga. The different SSAvalues were affected by the relative abundance of smectite and cristobalite (SiO2/Al2O3 = 2.2 and 6.5, respectively, from Bana and Sabga). The activated clays from Bana and Sabga displayed interesting physicochemical and textural properties and can be considered as promising adsorbents for the bleaching of vegetable oils.

Protection features of chromium-nickel steel in sulfuric acid solutions by triazole derivative

2019 ◽  
pp. 15-21
Author(s):  
Ya.G. Avdeev ◽  
◽  
Yu.B. Makarychev ◽  
D.S. Kuznetsov ◽  
L.P. Kazanskii ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Nickel Steel ◽  
Acid Solutions ◽  
Triazole Derivative ◽  
Sulfuric Acid Solutions

Electrochemistry of Gold in Aqueous Sulfuric Acid Solutions under Neural Stimulation Conditions

2005 ◽  
Vol 152 (7) ◽  
pp. E212 ◽  
Author(s):  
Daniel R. Merrill ◽  
Ionel C. Stefan ◽  
Daniel A. Scherson ◽  
J. Thomas Mortimer
Keyword(s):  
Sulfuric Acid ◽  
Neural Stimulation ◽  
Acid Solutions ◽  
Aqueous Sulfuric Acid ◽  
Sulfuric Acid Solutions

EXTRACTION OF AMERICIUM (IV) BY DIOCTYLAMINE PROM SULFURIC ACID SOLUTIONS CONTAINING A COMPLETING AGENT

1985 ◽  
Vol 3 (4) ◽  
pp. 417-426 ◽  
Author(s):  
B.F. Myasoedov ◽  
M.S. Milyukova ◽  
D.A. Malikov ◽  
Ye.V. Kuzovkina ◽  
N.S. Varezhkina
Keyword(s):  
Sulfuric Acid ◽  
Acid Solutions ◽  
Sulfuric Acid Solutions
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