PHYSICOCHEMICAL STUDIES OF PYROPHYLLITE
OF THE NIKOL’SK DEPOSIT
E. S. Abdrakhimova
Translated from Novye Ogneupory, No. 2, pp. 10 – 12, February, 2010.
Original article submitted October 27, 2009.
Elemental chemical analysis shows that pyrophyllite of the Nikol’sk deposit does not contain iron oxide. Due
to the high content in pyrophyllite ore of pyrophyllite and diaspore (corresponding 80 and 4%) the amount of
aluminum oxide within exceeds 30%, that will facilitate preparation of high quality acid-resistant materials.
Keywords: pyrophyllite, chemical composition, elemental, x-ray, thermal, petrographic methods of analysis,
scanning electron microscope, mineral composition.
The fundamental possibility of using pyrophyllite of the
Nikol’sk deposit in the production of acid-resistant materials
was demonstrated in [1 – 3]. However, in these works there
is no provision of the physicochemical methods for studying
Results are provided in this article for physiochemical
properties of pyrophyllite of the Nikol’sk deposit by contem-
porary methods. X-ray patterns were obtained in a DRON-5
diffractometer using Cu
-radiation with a table rotation rate for a specimen of
1 deg/min and with heating in a tube with a voltage of 40 kV
and a current of 2 mA using a NaJ(TL) scintillation counter;
elemental analysis of specimens was performed in an elec
tron microscope FEI Quanta Inspect S with an EDAX Gene
sis attachment and an ultrathin window; petrographic studies
were performed using immersion liquids, transparent sec
tions and polished sections under MIM-8 and MIM-7 micro
scopes; thermograms were recorded in an R. Erdei and
A. Laurik instrument in the range 20 – 1200°C; an electron
photo was obtained in a canning electron microscope Phillips
525M with an EDAX 9S00 detector.
O is similar in properties to
talc , but with respect to block dimensions natural pyro
phyllite surpasses pieces that it is possible to obtain from
talc. Various objects are turned from pyrophyllite due to its
softness, retaining shape and dimensions after firing [5, 6].
Processes that occur in pyrophyllite during production of ce
ramic facing plates, have been described in publications
In contrast to normal sedimentary clays, pyrophyllite
forms in zones of intense metamorphism at 300 – 400°C, and
it is deposited in the form of dense rock not soaked in water.
The small amount of shrinkage during firing makes it possi-
ble to prepare refractory objects from pyrophyllite or use it
as a shortening addition in ceramic mixes. Firing of pyro-
Refractories and Industrial Ceramics Vol. 51, No. 1, 2010
1083-4877/10/5101-0006 © 2010 Springer Science+Business Media, Inc.
Samara State University of Architecture and Construction, Sama
Element concentration, wt.%
O C Na Mg Si Al S Cl Ti
54.5 1.14 0.39 2.39 27.51 14.69 0.04 0.38 1.35
Fig. 1. Results of elemental chemical analysis of Nikol’sk pyro