Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 7, pp. 10031010.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © E.P. Lokshin, V.N. Lebedev, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 7, pp. 10331041.
AND INDUSTRIAL INORGANIC CHEMISTRY
Interaction of Baddeleyite with Sodium Nitrate and Nitrite
E. P. Lokshin and V. N. Lebedev
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Russian Academy of Sciences, Kola Science Center, Apatity, Russia
Received February 27, 2012
Abstract—Features of baddeleiyte concentrate decomposition by interaction with sodium nitrate and nitrite were
researched as well as those of hydrolytic and acid decomposition of resulting cakes.
Baddeleyte, natural zirconium(IV) oxide, is chemi-
cally very stable. Baddeleyite concentrates (BC) are pro-
duced in Russia by JSC “Kovdor GOK” according State
Standard TU 1762-003-00186759-2000 and used without
any chemical processing in production of refractories,
glazes, etc. For production of zirconium compounds the
BC zirconium should be converted into the solution.
Methods of fusing with potassium biﬂ uoride or chlori-
nation in the presence of a carbon reductant, which are
applied to the decomposition of zircon that is similar in
chemical properties, have several disadvantages. Due to
this fact the search for alternative methods of processing
BC, which is currently the only Russian source of raw
materials of zirconium, is relevant.
For obtaining Na
almost total interaction of
a mixture BC with soda is reached at 1100–1200° .
The high temperature of the interaction has caused certain
difﬁ culties at further cake processing as noted below.
It is shown that sodium metazirconate Na
obtained by fusion with NaOH at 550–650°, but due to
the high cost of alkali and formation of “alkali mist” the
process has been recognized as low-tech .
In this paper we studied the patterns of interaction
of BC with low-melting compounds of sodium: sodium
nitrate and nitrite. It was suggested that a liquid reagent
allows reducing the decomposition temperature of BC,
developing methods for production of compounds of zir-
conium using reagents containing sodium in circulation.
Information on the interaction of NaNO
metal oxides is limiting. In examination of NaNO
action with chemically stable Al
formation of sodium
aluminate was in a temperature range of 790–870°.
Information on an Al
binding termination and the pro-
cess mechanism is contradictory [2–4]. It was conﬁ rmed
is decomposed according to the following
O + NO + NO
At ﬁ rst it was suggested that sodium aluminate for-
mation is associated with the interaction of Al
proximately equally with NaNO
the following reactions
+ NO + NO
= 2 NaAlO
Later it was concluded that the reaction with sodium
oxide is main and that with sodium nitrite is of only
a small signiﬁ cance.
We examined an interaction of baddeleyite and syn-
thetic zirconium(IV) oxide with NaNO
also hydrolytic and acid decomposition of the resulted