1 ton / day Pilot Plant
(300 kVA AC-arc facility)
The 1 ton / day AC-arc facility consists of:
- Three-phase arc furnace (250 kW max)
- Power supply 1 x 300 kVA transformer/tap changer
- Control and data logging systems
Description of the pilot plant
The furnace shell is lined with refractory bricks suitable for the testwork being done. The hearth is usually lined with high-magnesite rammable material. The roof of the furnace is lined with alumina castable refractory. The furnace shell is further equipped with water-spray cooling.
The three 100 mm graphite electrodes enter the furnace through three symmetrically positioned ports. The feed enters the furnace through a feed port positioned between the two electrode ports in the front.
The feed system consists of six 0.9 m³ batching hoppers fitted with vibratory feeders. The vibratory feeders discharge the feed material onto a belt conveyor, from where it is fed into the furnace supply feed hopper.
The power supply is a three-phase unit fed by a 11 kV, 50 Hz supply. One unit of the transformer is an auto-regulator with on-load tap changer and a reactor with a manually operated off-circuit tap switch. The second unit is a tapless main transformer with a ratio of 73:3 and double-wound secondary winding.
The off-gases are extracted by a reversed pulse bagplant rated at 6 500 Nm³/h. The bagplant utilizes 100 polyester needlefelt bags with a total area of 100 m². The fume released from the bags settle into a cone, from where it is continuously discharged through a rotary valve into drums.
Pyrometallurgy Division, Mintek,
200 Hans Strijdom Drive, Randburg, 2125, South Africa
Private Bag X3015, Randburg, 2125, South Africa.
Phone: +27 (11) 709-4642
Fax: +27 (11) 793-6241
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Copyright © 1996-97 George la Grange, Mintek, email@example.com
7 October 1997