OLIVINES OF THE KOLA PENINSULA.
II. MAGNETIC CONCENTRATION OF OLIVINITES
N. N. Grishin,
A. I. Rakaev,
and V. T. Kalinnikov
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 12, pp. 31 – 38, December, 2000.
A patented technology for dry magnetic concentration of olivinites developed and tested in semi-industrial
conditions for the production of high-quality olivine concentrates is described. Concentration of olivinites of
the Khabozerskoe deposit rich with sungulite yields an additional sungulite product.
Olivinites of the Kola Peninsula are used for the produc-
tion of forsterite refractories, especially by power-saving
technologies . However, the conditions of their occurrence
predetermine the low quality of the raw olivinite . The re-
quirements placed on the raw material partially depend on
the production process of refractories .
There are two fundamentally different schemes of the
production of refractories from raw olivine. The first scheme
involves unroasted green olivinites; in the second scheme,
the olivine-bearing starting material is subjected to prior
high-temperature roasting. The first scheme works only for
high-quality olivinites that do not bear admixtures of hy
drated magnesium silicates (sungulite, serpentines, hydro
micas) above the permissible limit. In the second scheme, the
presence of these admixtures is not important because they
lose chemically bound water in the process of prior roasting.
However, the admixtures containing aluminum, calcium, and
alkaline oxides are undesirable here too, as in the first
scheme, because roasting does not remove these elements
and the problem should be solved by some other means.
The first scheme is more efficient because it does not re
quire much power in the stage of preparation of the raw com
ponents. The search for a more efficient method for fabricat
ing a high-quality olivine-bearing refractory raw material to
be used in the roasting stage, which would satisfy the re
quirements of the first scheme for the production of refrac
tories based on it, was the main goal of the present study.
In order to create efficient methods for fabricating a
quality olivine raw material from natural olivinite ores, we
analyzed the physicochemical properties of the base and the
impurity materials and their components (Table 1).
Comparison of the strength characteristics of these min-
erals shows that even in the stage of crushing the slurry part
will be enriched with mica and clay minerals. Indeed, it fol-
lows from pervious articles of the present series [2, Table 3]
that fine classes are richer in the elements contained in these
minerals. Withdrawal of the fine classes (deslurring) can be
envisaged in the concentration technology. Calcium-bearing
minerals, amphiboles, and pyroxenes have a hardness com
parable with that of olivine, which allows us to expect that
there will be no differences in the concentrations of these
minerals and olivine in any coarseness class of the
The distribution of the minerals with respect to their den
sity is almost similar to the distribution with respect to their
strength. Magnetite has the highest density due to the high
content of iron in it; then follow olivine, diopside, micas, am
phiboles, hydrated forms of magnesium hydrosilicates, and
talc. Gravitational separation removes micaceous minerals
and talc with the light fraction and magnetite with the heavy
The color spectrum of the minerals varies from white to
black through colorless, light-pink, light-green, and green
shades, which allows us to expect that many undesirable im
purities should be removable by photometric methods into
the weakly colored part. However, in this case we risk that a
part of the forsterite will be lost.
The magnetic properties are the most scattered and are
favorably combined with the mineral and chemical composi
Refractories and Industrial Ceramics Vol. 41, Nos. 11 – 12, 2000
1083-4877/00/1112-0444$25.00 © 2001 Plenum Publishing Corporation
A series of works is devoted to the memory of our comrade
Mikhail Evgen’evich Kononov; the present work was begun at his
Kola Scientific Center of the Russian Academy of Sciencies,
Mining Institute of the Kola Scientific Center, Russia.