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1.The reaction steps include: 1) liquid reactants or products through the the external diffusion of liquid boundary layer; 2) liquid reactants or products through the  internal diffusion of the liquid boundary layer; 3) interface chemical reaction. Solid-state reactants (RE2 (CO3) 3) are approximation treated with by spherical,if it is assumed that the diffusion rate of liquid product fast enough, then the three kinetic equation sequence occurre as follows:
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2.D1 and Ds in the expression are the effective diffusion coefficient of the   liquid boundary layer and solid produt layer separately when A reactant through both of them;the   thickness  of liquid boundary layer is ¦Ä;the interface chemical reaction rate constant is kr.
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