A new hydrate of magnesium carbonate, MgCO₃·6H₂O

Abstract

During investigations of the formation of hydrated magnesium carbonates, a sample of the previously unknown magnesium carbonate hexahydrate (MgCO3·6H2O) was synthesized in an aqueous solution at 273.15 K. The crystal structure consists of edge‐linked isolated pairs of Mg(CO3)(H2O)4 octahedra and noncoordinating water molecules, and exhibits similarities to NiCO3·5.5H2O (hellyerite). The recorded X‐ray diffraction pattern and the Raman spectra confirmed the formation of a new phase and its transformation to magnesium carbonate trihydrate (MgCO3·3H2O) at room temperature.

Management of Solid Waste Marble Powder: Improving Quality of Sodium Chloride Obtained From Sulphate Rich Lake/Subsoil Brines With Simultaneous Recovery of High Purity Gypsum and Light Basic Magnesium Carbonate

“…During investigations it has been found that a rare form of magnesium carbonate hexahydrate (MgCO 3 •6H 2 O) has been crystallized (Rincke et al, 2020). MgCO 3 •6H 2 O formed was analysed for chemical composition (Table 11), and characterized for its bulk density, moisture content, purity and morphology.…”

Review of carbon dioxide mineralization of magnesium‐containing materials

“…[20][21][22] The dry process involves a gas-solid reaction between CO 2 and mineral raw materials at a suitable reaction temperature and pressure, which is a straightforward process that can utilize the reaction heat to generate steam. [21][22][23][24] Typically, these reactions are conducted under high temperatures and pressures. Lackner [25] proposed a technique for sequestering CO 2 in solid silicates, primarily utilizing solid particles of serpentine (50-100 μm in size) to carbonate with CO 2 at a reaction temperature of 140-300°C.…”

Crystal structure and characterization of magnesium carbonate chloride heptahydrate

“…The crystal structures of other neutral magnesium carbonates, e.g. MgCO 3 Á5H 2 O, MgCO 3 Á6H 2 O and the chloride-containing magnesium carbonates Mg 2 (OH)Cl(CO 3 )Á2H 2 O (chlorartinite) and Mg 2 (OH)Cl(CO 3 )ÁH 2 O (dehydrated clorartinite), do not exhibit such double chains (Liu et al, 1990;Rincke et al, 2020;Sugimoto et al, 2006Sugimoto et al, , 2007. Therefore, the crystal structure of MgCO 3 ÁMgCl 2 Á7H 2 O is unique.…”