Precipitation of calcium and magnesium carbonates from homogeneous supersaturated solutions

被引：95

作者：

Pokrovsky, OS ^{[1
]}

机构：

[1] UPS CNRS, Lab Geochim, F-31400 Toulouse, France

来源：

JOURNAL OF CRYSTAL GROWTH | 1998年 / 186卷 / 1-2期

关键词：

calcium; magnesium; carbonates; precipitation; kinetics;

D O I：

10.1016/S0022-0248(97)00462-4

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Homogeneous (unseeded) precipitation of calcium and magnesium carbonates in the CaO-MgO-CO2-H2O system in supersaturated solutions was investigated. The induction period (tau) of spontaneous nucleation and the composition of precipitated solid phases were determined. The influence of saturation degree (chemical affinity) and Mg2+/Ca2+ activity ratio in solution on the kinetics of CaCO3 nucleation was studied. The order of CaCO3 homogeneous nucleation equals to 4. The surface energy of CaCO3 nucleus was measured to be 63 mJ/m(2). The main factor which controls the Mg content in the solid phase being formed during unseeded precipitation of carbonates is the saturation index of MgCO3 in solution. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：233 / 239

页数：7

共 42 条

[1] A Continuous and Mechanistic Representation of Calcite Reaction-Controlled Kinetics in Dilute Solutions at 25 degrees C and 1 Atm Total Pressure [J].