PRODUCTION AND EQUIPMENT
DEVELOPMENT OF POROUS PERMEABLE CERAMIC MATERIAL
AND FILTERING ELEMENT TECHNOLOGY FOR CANDLE-SHAPED
B. L. Krasnyi,
V. P. Tarasovskii,
and A. B. Krasnyi
Translated from Novye Ogneupory, No. 1, pp. 23 – 27, January 2009.
Original article submitted August 25, 2008.
A reduction in manufacture expenditure for a production unit, and also preparation of metals and alloys in pure
and ultra-pure form may be achieved using newly created filtering elements made of porous permeable ce
ramic materials with a pore size controlled from “micro” to “nano”. Methodology is presented for creating fil
tering elements made of porous permeable ceramic based on a concentrate of disthene-sillimanite for can
dle-shaped filtering elements.
Keywords: porous permeable ceramic material, filtering elements, candle-shaped filtering equipment,
disthene-sillimanite concentrate (DSC).
Analysis of trends in the development of inorganic mate-
rials science indicate that in the next 15 – 20 years the main
forms of structural materials of mass demand will remain
ferrous and nonferrous metals, and also alloys base on them.
Therefore questions of reducing expenditure for manufactur-
ing production units and obtaining metals and alloys in pure
and ultrapure form will be very important. Use of filtering el
ements created using innovative technology for porous per
meable ceramic with a regular pore size from “micro” to
“nano” will make it possible to resolve this problem effec
tively with minimum expenditure .
In order to prepare pure nickel, zinc and cobalt solutions
for electrolysis it is necessary to have multistage filtration in
order to remove extraneous impurities. In enterprises of the
mining and metallurgical industry for these purposes filter
presses of the open type have been used with manual unload
ing of the cake (deposit). Solutions have been filtered
through cotton belting mounted on wooden frames and
plates. According to data of the OAO Severonikel’ Combine
the annual consumption of belting reached 120 thousand m
and in order to manufacture frames and plates about 1800 m
of first class wood was consumed. It is impossible to mecha
nize and automate filtration in these units. The specific pro
ductivity of filters was low and was 0.12 – 0.25 m
with an excess pressure of 0.10 – 0.15 MPa.
In the 1980s mining and metallurgical enterprises started
to put into production candle-shaped filtering units produced
in Germany with filtering elements made of porous perme-
able ceramic in the form of hollow cylinders. The cake was
removed from the surface filtering elements in these filtering
units as a result of feeding compressed air to the inner cavity
of the filtering element that made it possible to alternate
filtration. The productivity of candle-shaped filtering units is
1.30 – 1.79 m
× h) with an excess pressure of
0.45 – 0.48 MPa, i.e. significantly higher than previously
used filter presses. During operation candle-shaped filtering
units have demonstrated high efficiency and operating capac
ity. In the stage of introducing and assimilating filtering ele
ment units they were supplied from Germany. Subsequently
production of filtering elements (based on fractionated
chamotte) was assimilated in Keramkombinat, Slavyansk,
Ukraine . During operation these filtering elements re
vealed their main disadvantages, i.e. low strength and acid
resistance, and also considerable scatter the values of water
permeability coefficient for filtering elements in separate
batches of objects.
Work for creating material, manufacturing technology
and organization started in an experimental way and then se
ries production of filtering elements, having high operating
characteristics, was carried out in ZAO NTTs Bakor in
200 – 2002.
Refractories and Industrial Ceramics Vol. 50, No. 1, 2009
1083-4877/09/5001-0022 © 2009 Springer Science+Business Media, Inc.
ZAO NTTs Bakor, Sherbinka, Moscow Region, Russia.