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Title: Kinetics and mechanism of dissolution and transformation of chloropinnoite in water at 293-313K
Authors: Liu, Zhihong
Hu, Mancheng
Gao, Shiyang
Xia, Shuping
Issue Date: Feb-2002
Publisher: NISCAIR-CSIR, India
Abstract: The influence of temperature (293-313K) and stirring rate on the kinetics of dissolution and transformation of chloropinnoite (2MgO.2B2O3.MgCl2.14H2O) in water have been studied. According to the kinetic c-t curve and pH-t curve, the process of dissolution and phase transformation can be divided into three stages: dissolution, transformation induce dissolution, and crystallization stage. The experimental results show that chloropinnoite dissolves incongruently in water. MgCl2 is removed first and then the midproduct(MgO.B2O3.4H2O) is formed. The final phase transformation product is inderite  (2MgO.3B2O3.15H2O). The kinetic equations of dissolution and crystallization have been obtained. The kinetic mechanisms of dissolution and crystallization reactions have been confirmed according to order of reaction, activation energy and effect of stirring.
Page(s): 325-329
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.41A(02) [February 2002]

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