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Chin J Mater Res  2008, Vol. 22 Issue (6): 585-588    DOI:
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A kinetics study on growth process of Mg(OH)2 crystal
 WANG Wei1; GU Huimin1; ZHAI Yuchun1†; DAI Yongnian2
1.School of Material and Metallurgy; Northeastern University; Shenyang 110004
2.Faculty of Materials and Metallurgical Engineering; Kunming University of Science and Technology; Kunming 650093
Cite this article: 

WANG Wei; GU Huimin; ZHAI Yuchun; DAI Yongnian. A kinetics study on growth process of Mg(OH)2 crystal. Chin J Mater Res, 2008, 22(6): 585-588.

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Abstract  

Flower-like spherical Mg(OH)2 powder was prepared. The effects of several key factors on recovery rate of Mg and the crystal growth kinetics of Mg(OH)2 were studied. The results show that with the increasing of initial concentration of Mg2+ and pH value, the recovery rate of Mg increases; increase the reaction temperature, the recovery rate increases, but when the temperature is above 60 °C, the pH value of reaction system decreases rapidly due to the volatilization of ammonia, and the recovery rate decreases; ageing process can increase the recovery rate of Mg, when the ageing time is above 60 min, because Mg has been precipitated completely, the recovery rate increases no more. Mg(OH)2 grains prepared by ammonia precipitation method under prime conditions are flower-like spherical, the shape is regular, the dispersivity is good, the granularity is uniform, the grain size is about 2 μm, the thickness of flake is about 30 nm. The mass of Mg(OH)2 precipitated and the average diameters of Mg(OH)2 grains increase exponentially with the reaction time.

Key words:  inorganic non-metallic materials      Mg(OH)2, ammonia precipitation method      flower-like spherical      crystal growth kinetics     
Received:  01 September 2008     
ZTFLH: 

TB321

 
  TQ132

 

URL: 

https://www.cjmr.org/EN/     OR     https://www.cjmr.org/EN/Y2008/V22/I6/585

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