Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (05): 468-471.doi: 10.3866/PKU.WHXB20000519

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Crystallization Dynamics of MgSO4-H3BO3-H2O System under Hydrothermal Condition

Zhang Li-Qing, Liu Su-Lan, Zhu Jian-Xin, Yao Shu-Hua, Xie Ying   

  1. Shenyang Institute of Chemical Technology,Shenyang 110021|Northeastern University,Shenyang 110006
  • Received:1999-07-26 Revised:1999-11-10 Published:2000-05-15
  • Contact: Zhang Li-Qing

Abstract:

The solution of MgSO4-H3BO3-H2O system containing 20%(mass fraction)MgSO4 and 2.5% H 3BO 3 was prepared and the experimental study of its crystallization at 180℃ were carried out in a high pressured vessel. Only a solid phase MgSO4•H2O was separated out from the system. The experimetal data were fitted. With the aid of simplex optimum method and Runge-Kutta digital solution of a set of differential equations, Single-nuclear interface reaction model (MB2) was selected to describe the process of crystallization of kieserite. the dynamic equation is as follows:
-dc/dt=0.064(2.24-c) 4/3 (c-0.290)2

Key words: Kieserite, Dynamic, High temperture crystallization, Boric acid