Research on Controllable Synthesis of Magnesium Carbonate Tri-Hydrate

Abstract:

In order to promote the comprehensive utilization of salt lake brine resources, magnesium carbonate tri-hydrate (MgCO₃·3H₂O) was synthetized by low-temperature hydrothermal technique using purified MgCl₂-rich brine and ammonium hydrogen carbonate solution as raw materials, the orthogonal experimental as method. The morphology could be tuned by changing the operating parameters. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the structures and morphologies of the products. The results show that the optimum conditions are as follows : reaction temperature is 40-50°C, n (Mg²⁺):n (HCO₃^-)=1:2.2, pH value is 8.8-9.0, stirring speed is 130 r/min, aging time is 3h, reaction time is 70 min. Magnesium carbonate tri-hydrate synthetized is one-dimensional acicular with good settling performance. Average aspect ratio could up to 29.60.

• Periodical: Applied Mechanics and Materials (Volume 525)
• Pages: 35-39
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.525.35
• Online since: February 2014
• Authors: Dan Wu*, Bi Jun Luo, Yu Qi Wang, Shao Yan Lu, Qi Zhang, Xi Ping Huang
• Keywords: Aspect Ratio, Nesquehonite, Orthogonal Experiment

References

[1] Wang X L: Direct observation of the shape evolution of MgO whiskers in a solution system. Materials Letters Vol. 60 (2006), pp.3160-3164.

DOI: 10.1016/j.matlet.2006.02.066

[2] Yan X X, Li Y F and Xue D F: Bonding analysis on the crystallization of magnesium carbonate hydrates. Journal of Synthetic Crystals Vol. 36 (2007), pp.991-999.

[3] Zhou XT, Fan GJ and Liu BN: Research on the composition and formation mechanism for hydrated alkali magnesium carbonate. Inorganic Chemicals Industry Vol. 1 (1993), pp.26-28.

[4] Freitag F, Kleinebudde P: How roll compaction and dry granulation affect the tableting behavior of inorganic materials: comparison of four magnesium carbonates. European Journal of Pharmaceutical Sciences Vol. 19 (2003), pp.281-289.

DOI: 10.1016/s0928-0987(03)00133-7

[5] Cheng WT, Li ZB and George PD: Effects of temperature on the preparation of magnesium carbonate hydrates by reaction of MgCl2 with Na2CO3. Chinese Journal of Chemical Engineering Vol. 17 (2009), pp.661-666.

DOI: 10.1016/s1004-9541(08)60260-8

[6] Kloprogge JT, Martens WN and Nothdurft L: Low temperature synthesis and characterization of nesquehonite. Journal of Materials Science Letters Vol. 22 (2003), pp.825-829.

[7] Mitsuhashi K, Tagami N and Tanabe K: Synthesis of micro tubes with a surface of house of cards, structure via needlelike particles and control of their pore size. Langmuir Vol. 21 (2005), pp.3659-3663.

DOI: 10.1021/la047580o

[8] Xu J, Xue D: Five branching growth patterns in the cubic crystal system: a direct observation of cuprous oxide microcrystals. Acta Materialia Vol. 55 (2007), pp.2397-2406.

DOI: 10.1016/j.actamat.2006.11.032

[9] Hu QF. Magnesium Compound Production and Application. (Beijing: Chemical industry press, Chinese 2004), pp.79-83.