Analysis of water leaching and transition processes in zirconium oxychloride octahydrate production

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• 作者：Ran Liu ; Jingkui Qu ; Jing Song ; Tao Qi ; Ailing Du
• 关键词：Zirconium oxychloride ; Water leaching ; Transition
• 刊名：Ceramics International
• 出版年：January, 2014
• 年：2014
• 卷：40
• 期：1_part_PB
• 页码：1431-1438
• 全文大小：1716 K

文摘

The water leaching and transition process in manufacturing zirconium oxychloride octahydrate was examined. Results from X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectra showed that most of the soluble sodium silicate was dissolved and the residue hydrolyzed into H₂SiO₃ during the water leaching process. In addition, Na⁺ from sodium zirconate (NaZrO₃) in the interlayer was removed during the first and second water leaching and the in-host layer was distinguished in the third water leaching. This process resulted in the hydrolysis of NaZrO₃ into ZrO(OH)₂. Results from the scanning electron microscopy (SEM), FT-IR spectra, nuclear magnetic resonance (NMR) and XRD of the transition process showed the main reaction and properties of the products at different pH values. Na₂ZrSiO₅ reacted with HCl at pH=7, producing ZrO(OH)₂路SiO₂ and NaCl. ZrO(OH)₂路SiO₂ partially reacted with HCl, forming ZrOCl₂ and H₂SiO₃ with a decrease in pH.