High Purity Magnesium Hydroxide Preparation from Tachyhydrite

Document Type : Research Note


1 Abadgaran Construction Chemicals Co., Tehran, I.R. IRAN

2 Chemistry Department, Sharif University of Technology, Tehran, I.R. IRAN

3 Abadgaran Chemical Technology Developement Research Group, Tehran, I.R. IRAN


In this research, sedimentation of magnesium hydroxide with high purity by Tachyhydrite was tested. For this aim Tachyhydrite solution and calcium hydroxide solution were mixed. This reaction involves the evolution of pH. At the end of experiment the slurry was filtered and washed with water and dried at 100°C. In order to increase filtration rate of Mg(OH)2 an agglomeration system by an anionic polyelectrolyte was applied. The product was then characterized by a complexometric titration to find the total calcium and magnesium content of sediment. Purity of magnesium hydroxide is important because of its use in preparation of magnesium oxide. Magnesium oxid should be high pure because it is used in production of refractories.


Main Subjects

[1] Whaley T. P., Magnesium Compounds of Industerial Significance, in: "The Proceedings of a Symposium Specialty Inorganic Chemicals" (Editor: Thompson, R.,), p. 123. University of Sanford, Special Publication No. 40, The Royal Society of Chemistry, 10—12 September 1980, Burlington House, London (1981).
[2] Song, Xingfu, Kefeng Tong, Shuying Sun, Ze Sun, and Jianguo Yu., Preparation and Crystallization Kinetics of Micron-Sized Mg (OH)2 in a Mixed Suspension Mixed Product Removal Crystallizer, Frontiers of Chemical Science and Engineering, 7(2): 130-138 (2013).
[3] Rothon R.N., "Magnesium Hydroxide: New Products, Process and Applications", Intertech. 19, Northbrooke Drive, Portland, Maine(Ed.), Functional Effec,. Filler, Berlin, Germany (2000).
]4] YU, Pei-feng, Xi-yun Yang, X. U. Hui, Xi-chang Shi, C.H.E.N. Ya, Guo-chun Yan, Separation Technique for Boron and Magnesium from Salt Lake Brine and Preparation of High-Purity Magnesium Oxide, The Chinese Journal of Nonferrous Metals, 23(2): 568-576 (2013).
[5] Barbosa C.A.S., Ferreira A., Constantino V.R.L. Synthesis and Characterization of Magnesium-Aluminum Layered Double Hydroxides Containing (Tetrasulfonated Porphyrin) Cobalt, European Journal of Inorganic Chemistry, 8: 1577-1584 (2005).
[6] Meng W.Q., Li F., Evans D.G., Duan X., Study on Preparation, Structure and Intercalation Assembly of MgFe-Cl Layered Double Hydroxides, Chinese Journal of Inorganic Chemistry, 20(5): 524-530 (2004).
[7] Dong H., Du Z., Zhao Y., Zhou D., Preparation of Surface Modified Nano-Mg(OH)2,  .Powder Technology, 98(2):325-329(2010)
[8] Luan, Xiao-Dong, Xia Chen, Xiao-Ye Gao, Wei-Feng Zheng, Hua-Wen Wang, and Yong-Xin Qi., Research on Production of High Purity Magnesium Hydroxide by Sodium Hydroxide and Dense Brine,pp 315-318, in:  “Environment, Energy and Sustainable Development” CRC Press (2013).
[9] Shah M.A., Ahsanulhaq Q., Novel Synthesis of Magnesium Oxide Nanoflakes, J. of Alloys and Comp., 482(1-2): 548-551 (2009).
[10] Santos, Tiago, Ana P. Luz, Carlos Pagliosa, and Victor C. Pandolfelli., Mg(OH)2 Nucleation and Growth Parameters Applicable for the Development of MgO Based Refractory Castables, Journal of the American Ceramic Society , 9(2):461-469(2016).