Synthesis of high purity magnesia MgO from Algerian dolomite ore
J. Min. Metall. Sect. B-Metall., 59 (1) (2023) 53-64. DOI:10.2298/JMMB220406005B
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Available online 16 January 2023
(Received 06 April 2022; Accepted 27 December 2022)
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Abstract
A nanometric Mg(OH)2 and MgO particles with high purity were successfully synthesized from Algerian dolomite via a leaching-precipitation-calcination process. The effect of leaching parameters, such as H2SO4 acid concentration (C), temperature (T), time (t), solid/liquid ratio (S/L), and precipitation parameters: type of precipitating base (KOH, NaOH, NH4OH), OH-/Mg2+ ratio, and temperature on the obtained product properties, were investigated using Taguchi approach. The optimal leaching conditions were selected as: C=5M, T=65 °C, t=15 min, and S/L ratio=1:5. Furthermore, the potassium hydroxide (KOH) was selected as the optimal precipitating base with OH-/Mg2+ = 10.5. The calcination of the precipitates at 800 °C during 2 h made it possible to produce a high purity MgO (~99.45 %) with a crystallite size of approximately 16.5 nm and particles in the form of agglomerated porous plates with a high SSA (70.42 m2/g) which may be of interest for some applications, such as catalysts or supports.
Keywords: Dolomite; Acid leaching; Precipitation; Mg(OH)2; MgO; Calcination
Correspondence Address:
M. Kolli,
Ferhat Abbas Setif University, Emergent Materials Research Unit, Setif, Algeria; Ferhat Abbas Setif University, Optics and Precision Mechanics Institute, Setif, Algeria;
email: kolmus_eulma@yahoo.fr
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