22nd International Symposium on Plasma Chemistry
July 5-10, 2015; Antwerp, Belgium
The treatment of the refractory oxide powder in RF plasma torch 1000 kW /
0.44 MHz
S. Nguyen-Kuok, Yu. Malakhov, I. Korotkikh and A. Lisafin
Laboratory of Plasma Physics, National Research University MPEI, ul. Krasnokazarmennya 14, RU-111250 Moscow,
Russia
Abstract: This work presents the main results of the treatment of refractory oxide fractions
(1÷200) µm of materials (Al 2 O 3 , ZrO 2 , MgO) in the RF plasma torch 1000 kW/0.44 MHz.
Keywords: treatment, RF plasma torch, refractory oxide powder
RF plasma torch 1000 kW/0.44 MHz used to process
refractory oxide materials (Al 2 O 3 , ZrO 2 , MgO). The
paper identifies the main technological parameters of the
process of obtaining MgO, ZrSiO 4 : thermal efficiency is
equal to the MgO (68.6÷83.1)%, ZrSiO 4 –
(67÷74)%, Al 2 O 3 – (75÷86)% of heating, temperature
and velocity of particles in the plasma (particle velocity in
the reactor v sz = 30 m/s; melting temperature of the
particles T MgO = 3100 K, T ZrO2 = 2800 K, T Al2O3 = 2300 K),
the movement and heating of the plasma torch (speed in
the center of the plasma torch v z = 113 m/s, maximum
temperature 9246K) loaded particle flux with regard to
their interaction (the effect cool down) weight limit
processing of particles in given parameters of the plasma
set (for the MgO – 240 kg/h fraction of 100 µm, for
ZrSiO 4 – 520 kg/h, 100 µm fraction, for ZrO 2 – 350 kg
/h, 100 µm fraction).
The results of treatment of oxide powder fractions
(50÷500) µm are shown in Figs. 1-8.
Fig. 1. MgO powder 10÷150 µm fractions prior to
treatment in air plasma - RF 1000 kW/0.44 MHz.
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Using the obtained estimates [1-4] can be concluded
that the limit load MgO oxide powder is 245 kg/h for a
fraction of 50 µm. Thermal efficiency MgO powder
processing is at the limit (67.8÷82.6)% for the particle
fraction of 350 and 50 µm respectively. Maximum upload
ZrSiO 4 oxide powder is 530 kg/h for a fraction of 50÷300
µm. Thermal efficiency MgO powder processing is at the
limit (67.1÷74.4)% for the particle fraction of 500 and 50
µm respectively. Given the fact that in zircon ZrSiO 4
contains a percentage of 66% zirconium oxide ZrO 2 , then
the maximum output will be 350 kg/h. Using the obtained
estimates can be concluded that the limit load Al 2 O 3
oxide powder is 340 kg/h for a fraction of 50 µm.
Thermal efficiency processing of Al 2 O 3 powder is in the
limit (74÷86)% fraction of particles 350 and 50 µm
respectively.
Fig. 2. MgO powder 10÷150 µm fractions after
treatment in air plasma - RF 1000 kW/0.44 MHz.
1
Fig. 3. Heat flux of heating particles MgO for different
factions.
Fig. 4. Heat flux of heating particles Al 2 O 3 for different
factions.
Fig. 5. The maximum loading on the particle size
ZrSiO 4 , MgO, Al 2 O 3 .
Fig. 6. Efficiency particle size for ZrSiO 4 , MgO, Al 2 O 3 .
Fig. 7. The temperature of the RF plasma
torch 1000 kW/0.44 MHz in the loading 80÷240 kg/h
MgO.
Fig. 8. The temperature of the RF plasma
torch 1000 kW/0.44 MHz in the loading 200÷360 kg/h
Al 2 O 3 .
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