Study of the Interaction between Calcium Hydroxide and Amorphous Silica Obtained from Serpentinites

被引：4

作者：

Beglaryan, H. A. ^{[1
]}

Zulumyan, N. H. ^{[1
]}

Isahakyan, A. R. ^{[1
]}

Melikyan, S. A. ^{[1
]}

Terzyan, A. M. ^{[1
]}

机构：

[1] Natl Acad Sci Republ Armenia, Inst Gen & Inorgan Chem, Yerevan 0051, Armenia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2019年 / 93卷 / 05期

关键词：

serpentine; amorphous silica; silicate anions; unsaturated Si-O(Si) bonds; sodium hydroxide; -wollastonite; HYDROTHERMAL SYNTHESIS; MECHANICAL TREATMENT; GLASS-CERAMICS; WOLLASTONITE; DECOMPOSITION; POWDERS; LATTICE;

D O I：

10.1134/S0036024419050042

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The interaction between calcium hydroxide Ca(OH)(2) and amorphous silica SiO2, a product of the polycondensation of silicic acids isolated from serpentines (Mg(Fe))(6)[Si4O10](OH)(8), is studied. It is found that hours-long autoclave treatment can be avoided when sodium hydroxide NaOH is added to an initial aqueous suspension prepared from CaO and SiO2, and amorphous calcium hydro- and hydroxosilicates that transform into -wollastonite upon annealing in the temperature range of 800-815 degrees C can be obtained with common stirring of a suspension heated to the boiling point under the conditions of atmospheric pressure. The mechanism behind the action of NaOH on the interaction of Ca(OH)(2) with this SiO2 is determined, and the optimum parameters of synthesis (the molar ratio of the initial substances and the duration of stirring and annealing) are determined.

引用

页码：924 / 931

页数：8

共 11 条

[1] Study of the Interaction between Calcium Hydroxide and Amorphous Silica Obtained from Serpentinites
H. A. Beglaryan
N. H. Zulumyan
A. R. Isahakyan
S. A. Melikyan
A. M. Terzyan
Russian Journal of Physical Chemistry A, 2019, 93 : 924 - 931
[2] MOLECULAR DYNAMICS STUDY ON THERMAL RESISTANCE BETWEEN AMORPHOUS SILICA NANOPARTICLES
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