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Continuous Preparation of Calcite, Aragonite and Vaterite, and of Magnesium‐Substituted Amorphous Calcium Carbonate (Mg‐ACC)
Author(s) -
Nebel H.,
Epple Matthias
Publication year - 2008
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200800134
Subject(s) - vaterite , aragonite , calcite , calcium carbonate , amorphous calcium carbonate , magnesium , aqueous solution , amorphous solid , crystallization , chemistry , inorganic chemistry , carbonate , calcium , chemical engineering , materials science , nuclear chemistry , mineralogy , crystallography , organic chemistry , engineering
The three water‐free calcium carbonate polymorphs calcite, aragonite and vaterite were prepared from aqueous solutions without additives using standard laboratory equipment in a continuous process. Variation parameters were the way of mixing, the solution concentrations, and the reactor residence time. The samples were crystallographically and chemically pure, but a thorough elemental analysis revealed the presence of small amounts of sodium carbonate which was not detectable by X‐ray powder diffraction. The continuous process avoids the inherent variability of batch syntheses. By adapting the crystallization parameters, magnesium‐substituted amorphous calcium carbonate (molar ratio of Mg:Ca of 1:2.68) was prepared in this continuous process.