A facile and reliable route to prepare highly dispersive ammonium dimolybdate uniform crystals from commercial molybdenum oxide

Jun Zhang; Yanhui Guo; Weiwei Lu; Xuming Guo; Mingchen Xu; Hongbo Guo

Journal of Industrial and Engineering Chemistry, Vol.18, No.5, 1824-1827, September, 2012

DOI10.1016/j.jiec.2012.04.013 Export Citation

A facile and reliable route to prepare highly dispersive ammonium dimolybdate uniform crystals from commercial molybdenum oxide

Jun Zhang^†, Yanhui Guo, Weiwei Lu, Xuming Guo, Mingchen Xu¹, and Hongbo Guo¹

Chemical Engineering & Pharmaceutics School, Henan University of Science & Technology, Luoyang 471003, PR China
¹Luoyang Luanchuan Molybdenum Group Co., Ltd., Luoyang 471500, PR China

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Highly dispersive ammonium dimolybdate crystals with high purity have been prepared through reaction-evaporation-crystallization united route using commercial molybdenum oxide as starting material. The as-prepared ammonium dimolybdate uniform crystals were systematically characterized by X-ray powder diffraction, transmission-reflection optical microscope, Fourier transform infrared spectroscopy and TG-DSC thermal analysis. The Fsss grain diameter, loose packed density, and crystal-grain size distribution were also measured by the Malvern laser particle sizer. These collective characterization and analysis reveal that the ammonium dimolybdate grains are non-agglomerated uniform crystals with well normal distribution and geometric shape. The average Fsss diameter, d(0.5) and loose packed density are 433.316 μm, 470.981 μm and 1.592 g cm^(-3), respectively, which could well meet the quality requirements for the subsequent production of molybdenum powders.

Keywords:Commercial molybdenum oxide;Ammonium dimolybdate;Crystal;Preparation

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[2] Wang JW, Han JS, China Molybdenum Industry., 27(1), 43 (2003)

[3] Xu ZC, Zhang P, China Molybdenum Industry., 25(4), 4 (2001)

[4] Han J, China Molybdenum Industry., 32(2), 55 (2008)

[5] Li WC, Chinese Journal of Nonferrous Metals., 17(4), 41 (2007)

[6] Luo JH, Guo JG, Wang XQ, China Molybdenum Industry., 27(1), 24 (2003)

[7] Tang JL, Tang LX, Luo JH, China Molybdenum Industry., 34(4), 21 (2010)

[8] Yin ZL, Wu ZP, Chen QY, Zhang PM, Chinese Journal of Nonferrous Metals., 12(3), 596 (2002)

[9] Zhang XA, Wu WJ, Man YH, Tian XZ, Science in China (B)., 37(2), 156 (2007)

[10] Liu QQ, Yang J, Sun XJ, Cheng XN, Journal of Inorganic Materials., 22(1), 70 (2007)

[11] Cheng SD, Wang DZ, Wu ZZ, Chinese Journal of Material Science and Equipment., 3, 69 (2008)

[12] Zhu BZ, Lin YY, Shang XY, Liu SY, Journal of Lanzhou University (Natural Sciences)., 33, 72 (1997)

[13] Stampel SR, Chen Y, Dumesic JA, Journal of Catalysis., 105, 445 (1987)

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[15] Shaheen WM, Selim MM, Journal of Thermal Analysis and Calorimetry., 59, 961 (2000)