Abstract
AbstractVarious morphologies of magnesium carbonate hydrate had been synthesized without using any organic additives by carefully adjusting the reaction temperature and time during the talc carbonation process. At lower temperatures, magnesium carbonate hydrate was prone to display needle-like morphology. With the further increase of the carbonation temperature, the sheet-like crystallites became the preferred morphology, and at higher aging temperatures, these crystallites tended to assemble into layer-like structures with diverse morphologies, such as rose-like particles and nest-like structure. The reaction time had no effect on the crystal morphology, but it affected the particle size and situation of the crystal growth. X-Ray diffraction results showed that these various morphologies were closely related to their crystal structure and compositions. The needle-like magnesium carbonate hydrate had a formula of MgCO3·3H2O, whereas with the morphological transformation from needle-like to sheet-like, rose-like, and nest-like structure, their corresponding compositions also changed from MgCO3·3H2O to 4MgCO3·Mg(OH)2·8H2O, 4MgCO3·Mg(OH)2·5H2O, and 4MgCO3·Mg(OH)2·4H2O.
Highlights
IntroductionAs an important magnesia inorganic chemical product, has been widely used in various industrial fields (e.g., filter material, pharmaceuticals, cosmetic manufacturing, rubber industry, lithographing inks, and as precursors for high-purity magnesium oxide [1,2])
Magnesium carbonate hydrate, as an important magnesia inorganic chemical product, has been widely used in various industrial fields
We systemically investigate the influence of reaction temperature and reaction time on the morphologies of magnesium carbonate hydrate
Summary
As an important magnesia inorganic chemical product, has been widely used in various industrial fields (e.g., filter material, pharmaceuticals, cosmetic manufacturing, rubber industry, lithographing inks, and as precursors for high-purity magnesium oxide [1,2]). Magnesium carbonate hydrate is a class of chemical compounds, and the general formula can be expressed as xMgCO3·yMg(OH)2·zH2O Each pair of xyz values corresponds to a material. Each material has its own crystal type and micromorphology. It is generally accepted that the crystal type, micromorphology, and their properties are closely related, and different forms of particles sometimes give different particle properties even for the same substance [3,4]. The design and synthesis of magnesium carbonate hydrate with well-controlled morphology are very important
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