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Clays and Clay Minerals GSW 2008 Users' Group Meeting
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Clays and Clay Minerals; December 2007; v. 55; no. 6; p. 572-582; DOI: 10.1346/CCMN.2007.0550604
© 2007 Clay Minerals Society
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SYNTHESIS OF Ni-RICH 1:1 PHYLLOSILICATES

Maria Bentabol1, Maria Dolores Ruiz Cruz1,* and F. Javier Huertas2

1 Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, Spain
2 Estación Experimental del Zaidín, CSIC, Prof. Albareda 1, 18008 Granada, Spain

* E-mail address of corresponding author: mdruiz{at}uma.es

Rapid dissolution of partly amorphized kaolinite in the systems kaolinite + NiCl2, kaolinite + Ni(OH)2, and kaolinite + NiCl2 + Ni(OH)2, at a temperature of 200°C and at pH between 5.3 and 7.4, leads to the precipitation of Ni-poor kaolinite, Ni-rich kaolinite and Al-Ni-serpentine. Identification of the phases was carried out using a combination of X-ray diffraction and transmission/analytical electron microscopy. Ni-bearing kaolinite shows variable morphologies in the systems studied: stacks of kaolinite with relatively small Ni contents and fine-grained curved particles of Ni-rich kaolinite dominate in the Cl-bearing system; spherical particles with a disordered structure and relatively uniform Ni contents (in the order of 0.15 atoms per formula unit (a.p.f.u.)) and platy particles of Al-Ni-serpentine characterize the products formed in the Ni(OH)2-richest systems. The presence of Ni(OH)2 in the systems (with and without Cl) favors the dissolution process as well as rapid precipitation of spherical particles, and the formation of serpentine. A difference from Mg systems studied previously is a well defined phase intermediate in composition between kaolinite and serpentine which originated in the Ni-bearing systems. Increasing Ni content is clearly reflected in the parallel increase in the b cell parameter of kaolinite. The average composition of the coexisting Al-Ni-serpentine is: (Al1.24Ti0.01Fe0.02Ni1.31) (Si1.58Al0.42)O5(OH,Cl)2.

Key Words: Al-Ni-serpentine • FTIR • Hydrothermal Synthesis • Ni-kaolinite • TEM/AEM • XRD






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