PRODUCTION AND EQUIPMENT
DEVELOPMENT OF CERAMIC MATERIAL AND FILTERING
ELEMENT TECHNOLOGY FOR DISK VACUUM FILTERING UNITS
USED IN DEWATERING FERROUS AND NONFERROUS
METAL ORE CONCENTRATES
B. L. Krasnyi,
V. P. Tarasovskii,
and A. B. Krasnyi
Translated from Novye Ogneupory, No. 3, pp. 24 – 28, March 2009.
Original article submitted June 25, 2008.
Question of reducing expenditure for producing a production unit may be resolved by means of filtering ele
ments made of porous permeable ceramic materials with a controlled pore size created using the newest tech
nology. Methodology is presented for creating sector filtering elements made of porous permeable ceramic
based on electrocorundum for disk vacuum filtering units used extensively in ferrous and nonferrous
Keywords: filtering elements, filtration unit, metallurgical concentrate, porous permeable material, cake,
screening property, ore-dressing enterprise.
The demand in recent years for innovative technology
has become a defining factor in the competitive struggle for
the sales market. From this point of view objects made of po-
rous permeable ceramics are of multifunctional interest for
various branches of industry. Technical and economic as
pects are given below for the problem of using objects made
from filtration materials on the example of dewatering a met
allurgical concentrate after flotation enrichment. The high
operating expenditure for drying concentrates determines the
interest of each enterprise in preparing concentrates with the
minimum moisture content (Table 1).
Moisture removal by means of supplying a heat carrier
(drying) is very energy consuming (in order to remove 1 g of
water it is necessary to expend 500 kcal), and therefore in
practice water removal it is accomplished in two stages. In
the first stage excess water is removed by filtration. The
moisture content of a concentrate after dewatering in disk
vacuum filtration units made from cloth is 10 – 12%. In the
second stage the concentrate is dried in various drying units.
With preparation of a concentrate after filtration with a mois
ture content of 7.5 – 9.0% or less it is possible to exclude
drying it entirely before pyrometallurgical processing.
Contemporary ferrous and nonferrous metallurgy, in
view of the exhaustion of the reserves of rich ore deposits,
has been forced to change to processing ore with a very small
content of useful components. This leads to a requirement for
regrinding ore to the micron level (£20 mm) before flotation.
Filtering elements made from cloth with dewatering of these
very fine concentrates becomes less effective since it has low
selectivity with respect to the very fine useful component.
After dewatering up to 10 g of useful components remain n
one liter of filtrate. In addition, during dewatering in disk
Refractories and Industrial Ceramics Vol. 50, No. 2, 2009
1083-4877/09/5002-0107 © 2009 Springer Science+Business Media, Inc.
ZAO NTTs Bakor, Sherbinka, Moscow Region, Russia.
TABLE 1. Comparison of Operating expenditure for Obtaining 1 ton of Metallurgical Concentrate in Different Stages of the production process
Index (for 1 ton of concentrate) Drying in a drying unit Filtration in disk filtering units with cloth filtering elements
Specific capital expenditure, ruble 6.5 – 16.0 1.5 – 2.5
Specific operating expenditure, ruble 2.5 – 5.0 0.8 – 2.8
Electric energy expenditure, kW × h
19.0 – 30.0 4.8 – 7.2