PRODUCTION AND EQUIPMENT
RESULTS FROM STUDY OF A PNEUMATIC SYSTEM
FOR TRANSPORTING NANOPARTICLE-BEARING LIME DUST
AT THE SEROV FERROALLOYS PLANT
S. Ya. Davydov,
R. A. Apakashev,
V. S. Kiiko,
and V. N. Koryukov
Translated from Novye Ogneupory, No. 11, pp. 17 – 22, November, 2015.
Original article submitted January 27, 2015.
A description is presented of the system used by the Serov Ferroalloys plant for the pneumatic transport of
lime dust that contains nanoparticles. The morphology of the particles of well-burnt lime is discussed. Recom
mendations are given on ensuring stable operation of the system and subjecting the dust to additional
Keywords: pneumatic transport, lime dust, nanoparticles, electrostatic precipitators, dust lines, jet pump.
The Serov Ferroalloys Plant began to produce lime for
its own needs in 1962. The lime was made in a lime-
stone-calcining shop with a design capacity of 210,000 tons a
year . Well-burnt lime for the plant’s own use is currently
made in three rotary kilns and is employed in the production
of refining-grade ferrochromium.
To replace the worn-out equipment that removed the
burnt-lime dust, in 2014 a study was made of the perfor
mance of the entire gas-handling system for the kilns. Ac
cording to a report issued by the company “Halogen,” since
28.04.2004 the lime dust has had a CaO content of at least
60% and MgO and crystalline SiO
contents from 2 to 10%.
In accordance with the standard TU 14-140-30–04, lime dust
can be used lime acidic soils in farming, to make mortars in
the building industry, to keep materials from freezing in min
ing operations, for other purposes in other industries. Data
from measurements made by the burnt-lime shop starting on
24.03.2014 shows that the dust leaving the TsN-15 electro
static precipitators contains 0.043 g/m
of CaO and its car
bonate. The actual level of emission of hazardous substances
does not exceed 1.568 g/sec. Some of this dust is used in
other applications. Its physico-chemical and processing
properties have yet to be adequately studied, and investiga
tion of the various properties of this dust is a particularly im-
We studied the chemical composition of lime dust with a
JSM JEOL 6390LA scanning electron microscope that had
accessory instrumentation for x-ray probe microanalysis.
Figure 1 shows typical results from microanalysis of the ele-
mental composition of the dust. The results, reproducible
over an arbitrarily chosen range of test parameters, reflect the
composition of the lime dust in general. The data from the
microanalysis indicates that the weight contents of the main
components of the dust — calcium and oxygen — are 70.03
and 27.45%, respectively. Magnesium, silicon, and sulfur are
present as impurity elements. The total impurity content is no
greater than 3%.
Figure 2 shows the morphology of dust particles of the
well-burnt lime. The images were obtained on a “ZeissSigma
VP” scanning electron microscope with an accelerating volt
age of 3 kV and were recorded with the use of a second
ary-electron detector built into the column of the microscope
(in-lens detector). To prevent charging of the surface, the
powder specimen was applied to conducting carbon adhesive
tape and a “Quorum Q150T ES” sputter coater was used to
deposit a 5-nm-thick layer of gold on its surface by magne
tron sputtering. It is apparent from Fig. 2 that most of the
particles were within the size range 50 – 300 nm. The parti
cles do not have a natural facet. Most of them are in the form
of an oval and do not have any acute angles or sharp sur
faces. It is important that the individual particles are consoli
Refractories and Industrial Ceramics Vol. 56, No. 6, March, 2016
1083-4877/16/05606-0583 © 2016 Springer Science+Business Media New York
1 Ural State Mining University, Ekaterinburg, Russia.
Ural Federal University, Ekaterinburg, Russia.