FOR CERAMICS AND REFRACTORIES MANUFACTURED
FROM BADDELEYITE-CONTAINING PRODUCTS
OF THE KOVDORSKII MINING-AND-DRESSING WORKS JOINT-STOCK CO.
É. P. Lokshin,
V. N. Lebedev,
V. P. Lyakhov,
F. B. Kampel’,
and V. F. Popovich
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 11, pp. 34 – 40, November, 2002.
A technology for manufacturing zirconia-based materials of various quality grade intended for production of
ceramic and refractory components is developed.
Zirconium materials are widely used for manufacturing
special ceramics, with particular application in the refractory
industry. In the former Soviet Union, the main precursor ma-
terial for production of zirconium-based ceramics was zirco-
nium concentrate (All-Union Standard OST 48-82–84),
available from the Verkhne-Dneprovskii Mining and
Smelting Plant (Ukraine). In particular, zirconium concen-
trate was used for preparation of commercial zirconium di
oxide for refractory and abrasive industries, for radio and
piezoceramics, for heat-protective coatings, etc. Also, it was
used to manufacture refractory materials stabilized with yt
trium and calcium oxides, as well as fused zirconia with oxi
des of yttrium and aluminum for heat-protective coatings.
At present, the commercial delivery of zirconium con
centrate and its products from Ukraine meets with problems
. The only source of zirconium raw materials in Russia is
baddeleyite concentrate (BC) available from the Kovdorskii
Mining-and-Dressing Works Joint-Stock Co.; in recent years,
the BC output increased appreciably .
The quality of powdered BC (TU 1762-003-00186759–2000
Specifications) has improved appreciably in recent years.
However, because of the complex ore composition, certain
BC batches are delivered that are rather high in radionuclides
(U, Th). Furthermore, for some applications, products with
lower concentrations of rated impurities (SiO
, CaO, MgO, SO
, radionuclides) are needed.
The conventional technology of mechanical beneficiation is
little suited for obtaining high-purity products; therefore, we
have developed chemical methods for BC purification. Be-
cause of the short supply of zirconium raw materials in Rus-
sia, a technology for manufacturing commercial zirconium
products based on the processing of baddeleyite-containing
wastes (14 – 40 wt.% ZrO
) must be developed. Results of a
study in this direction are reported in the present paper.
1. IMPROVING THE QUALITY
OF BADDELEYITE CONCENTRATE
The main minor minerals contained in the BC available
from the Kovdorskii MDW are magnetite, forsterite, apatite,
ilmenite, zircon, calcite, and dolomite. As was reported in
[3 – 5], uranian pyrochlore, zirkelite, pyrochlore, zircon, and
perovskite are the common concentrators of radionuclides
and rare and rare-earth elements in ores of the Kovdorskoe
deposit. It is also believed that most radioactive nuclides
co-crystallize isomorphically with badelleyite, especially
with a badelleyite from the “abnormal zone.” BC manufac
tured from ores in this zone revealed a high concentration of
radionuclides (with the specific radioactivity of concentrate
reaching 1845 kBq/kg) and accompanying rare elements
(Nb and Ta). A microanalysis (see, for example, ) revealed
the occurrence, in badelleyite grains, of (wt.%): 1.62 – 2.04
, 0.37 – 2.51 Nb
, 0.28 – 0.64 Ta
, 0.08 – 0.32
, 0.04 – 0.095 Sc
and other impurities. In the context
Refractories and Industrial Ceramics Vol. 43, Nos. 11 – 12, 2002
1083-4877/02/1112-0353$27.00 © 2002 Plenum Publishing Corporation
I. V. Tananaev Institute of Chemistry and Technology of Rare
Elements and Raw Minerals, Kola Science Center, Russian Aca
demy of Sciences, Russia; Kovdorskii Mining-and-Dressing
Works (MDW) Joint-Stock Co., Russia.