A novel recirculating reactor for the leaching of magnesia by CO2

Mechanochemical processing of serpentine with ammonium salts under ambient conditions for CO2 mineralization

“…As possible candidates for the amorphous precursor, magnesium bicarbonate [Mg(HCO 3 ) 2 ] is certainly implicated in nesqehonite formation. However, it is claimed to exist only in solution, 34,35 and, furthermore, its composition (Mg : CO 2 = 2) does not fit. The Mg(H 2 O) n HCO 3 + ion has been modelled, [36][37][38] while surface bicarbonates on MgO are well-known from solidstate infrared spectroscopy.…”

Preparation of Mg(OH)2 with caustic calcined magnesia through ammonium acetate circulation

“…It's mainly used in two forms: crude magnesite and calcined magnesite (Demir et al, 2006;Bayrak et al, 2010). Calcined magnesite (MgO) still keeps metal oxide impurities (such as SiO 2 , Al 2 O 3 , Fe 2 O 3 and CaO), which is a problem for deep processing of magnesium products (Zhu et al, 2008). Calcined magnesite products are commonly classified into caustic calcined magnesia (CCM) and dead-burned magnesia (Birchal et al, 2000;Demir et al, 2006;Zhu et al, 2013).…”

Recovery of silica from sodium silicate solution of calcined boron mud

“…In this study, sodium silicate solution was used as a raw material to recover silicon dioxide by a carbonate formation and leaching process [15]. The objectives are to study the main factors involved in the carbonation process such as stirring speed, carbonation temperature, carbonation time, and concentration of sodium silicate solution, and also to determine the reaction mechanism for the carbonation process.…”