Russian Journal of Applied Chemistry, 2010, Vol. 83, No. 10, pp. 1750−1754.
Pleiades Publishing, Ltd., 2010.
Original Russian Text
E.L. Rumyantseva, V.A. Beletskaya, 2010, published in Zhurnal Prikladnoi Khimii, 2010, Vol. 83, No. 10, pp. 1610−1615.
INORGANIC SYNTHESIS AND INDUSTRIAL
Study of Sulfatization of Highly Basic Slags
E. L. Rumyantseva and V. A. Beletskaya
Belgorod State University, Belgorod, Russia
Received December 7, 2009
Abstract—The possibility of application of highly basic steel-smelting slag as a non-scarce raw material for
obtaining ultradisperse synthetic calcium sulfate dihydrate was studied. A ﬂ exible energy-saving technology of
its production was offered.
Development of technologies allowing the use of
secondary resources as a raw material for obtaining syn-
thetic materials is a promising direction of science and
technique advancement. Advantage of synthetic materials
consists ﬁ rst of all in the fact that it is possible to control
their structure and properties during their preparation
. Furthermore, the use of technogenic formations and
waste as a raw material for obtaining synthetic materials
promotes not only improving of the ecological situation
in a region, but also expanding a raw-material base of
the industry. Thus, chemical reprocessing of secondary
resources with the purpose of obtaining competitive
products is an actual and promising direction.
Highly basic slags are the most multivariant large-
capacity raw material providing a possibility of obtaining
various types of synthetic products. For example, Oskol
electrometallurgical integrated works accumulate more
than 360 000 ton annually . It is known that steel-
smelting slags are extremely ineffective in the industry
of building materials owing to nonconstant chemical and
mineralogical compositions and low hydraulic activity
[3–5]. Therefore the main mass of slags is downstocked
in refuse dumps, which render a negative technogenic
Experimental studies at the general chemistry chair
of the Belgorod state University have shown that the
chemical processing of highly basic steel-smelting slags
into ultradisperse gypsum-containing materials is funda-
mentally possible, expedient, and promising [6–8].
The aim of the present work was the substantiation
of the utilization of highly basic steel-smelting slags for
obtaining ultradisperse calcium sulfate dihydrate.
We used slags of Oskol and Chelyabinsk electro-
metallurgical integrated works (OEMW and CEMW)
as subjects of the study (Table 1). Chemical analysis of
samples was carried out by the X-ray ﬂ uorescent method
using a PW-1600/10 X-ray multi-channel spectrometer
with a PW 2582 Rh X-ray tube.
The slags under study are highly basic (М
> 2), low-
< 0.2), and inclined to a silicate disintegra-
tion, which hampers their immediate use in the industry
of building materials.
Using the X-ray analysis method (DRON-3), we
have found that the slags under study have equal quali-
tative composition, however quantitative contents of
crystal phases are different. So, the OEMW slag has
preferentially a merwinite–monticellite composition
), it contains also the
product of two-calcium silicate disintegration: shannonite
(γ-2СаО · SiO
). The presence of portlandite [Са(OH)
), and also a glass phase in the analyzed
material is a consequence of the application of the mixed
(air-dry and hydraulic) technology of slag melt cooling
As opposed to the OEMW slag, a predominant crystal
phase of slag CEMW is shannonite. Content of merwinite,
periclase (MgO), calcium chromite (СаCr
), and metal
chromium is insigniﬁ cant. Clear and intensive analytical
lines, and also the absence of a halo of an X-ray-amor-