Preparation and Characterization of Magnesium Hydroxide Nanoparticles from Dolomite-Talc Ore

Abstract:

Pure magnesium hydroxide (Mg(OH)2) nanoparticles were synthesized successfully from dolomite-talc ore via chemical precipitation. Carbonate minerals in dolomite-talc ore were dissolved with hydrochloric acid, and Fe2+ was oxidized to Fe3+, then Fe3+ and Al3+ were removed by adding ammonia to adjust pH to reach 6. Magnesium hydroxide (Mg(OH)2) nanoparticles with about 20nm thickness and lamella shape were obtained successfully when pH>10 in the presence of a nonionic surfactant polyethyleneglycol (PEG) with 3wt %, which reached by adding more ammonia. The XRD results show that the amorphous precipitate with 87% Fe2O3 generates at pH=6. However, CaMg2Cl6 (H2O)12 generates when pH = 7, then disappears with the increasing of pH. Mg(OH)2 appears at pH= 9 and pure Mg(OH)2 particle is obtained at pH > 10. Meanwhile, PEG plays an important role in the growth of Mg(OH)2 nanoparticles.

• Periodical: Advanced Materials Research (Volumes 482-484)
• Pages: 900-903
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.482-484.900
• Online since: February 2012
• Authors: Xiao Qian Jiang, Hong Wen Ma, Ge Li, Wen Gui Yao
• Keywords: Dolomite, Magnesium Hydroxide Nanoparticle, PEG

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