The composition of white corundum is α-Al2O3, which belongs to the trigonal system. The crystal form is short column, the true density is 3.85~4.01g/cm3, the hardness is 9, and the melting point is 2050°C. White alumina also has high thermal conductivity and electrical insulation, excellent chemical stability and resistance to reducing agents. Therefore, white alumina can be used as a raw material for advanced refractory materials, and is also an important artificial abrasive.
The white corundum electric arc furnace is used for charging the top of the silo and discharging the discharge trough. The mechanical part is composed of the following parts, Body, Body tilting, Copper busbar,Tube water-cooled cover, Electrode lifting, Hydraulic system, Water cooling system, Phaumatic systme, Unloading system.
Nama | brown alumina | Sintering alumina | Fused alumina | ||||
Normal type | Dense type | ||||||
chemical component % | Al2O3 | ≥95.0 | 98.7 | 97.6 | 98.1 | 98.9 | ≥98.6 |
SiO2 | ≤2.0 | 0.01 | 0.34 | 0.50 | 0.68 | ≤1.0 | |
Fe2O3 | ≤1.0 | 0.12 | 0.24 | 0.30 | 0.06 | ≤0.3 | |
TiO2 | ≤3.5 | 0.01 | 0.30 | 0.20 | 0.10 | ≤0.1 | |
CaO | 0.02 | 0.13 | 0.29 | 0.08 | ＜0.1 | ||
MgO | 0.02 | 0.25 | 0.14 | 0.10 | ＜0.1 | ||
K2O | 0.02 | 0.04 | 0.05 | 0.01 | ＜0.3 | ||
Na2O | 0.05 | 0.29 | 0.41 | 0.09 | |||
Color | brown | Grey white | White | White | Grey black | Grey | |
true density g/cm3 | 3.91 | 3.94 | 3.95 | ＜3.90 | |||
volume densityg/cm3 | ≥3.80 | 3.67 | 3.81 | ≥3.80 | |||
apparent porosity % | 1.8 | 3.5 | ≤4.0 | ||||
refractoriness ℃ | ≥1850 | ≥1850 | ≥1850 | ≥1850 | ≥1850 | ≥1850 | |
No. | Item | Unit | Data |
1 | Norminal capacity | t | 40 |
2 | Chamber diameter | mm | 4200 |
3 | Chamber depth | mm | 1000 |
4 | Electrode diameter | mm | 350Φ |
5 | Electrode circle | mm | 1250Φ |
6 | Electrode stroke | mm | 1600 |
7 | Electrode lifting speed | m/min | Lifting2.0\Lowering 1.5 |
8 | Transformer capacity | KVA | 4000 |
9 | Primary votage | KV | 33 |
10 | Secondary voltage | V | 170-380V/22 E-control regulation |
11 | Secondary current | KA | 13.5 |
12 | Cooling mode | OFWF | |
13 | Overload allow | ℅ | 20 |
14 | Tapping max angle | ° | 35° |
15 | Cooling water | t/h | ～80 |
High-voltage cabinet, low-voltage electrical control cabinet, copper busbar system, furnace body, water-cooled furnace roof, furnace body tilting mechanism, furnace roof lifting and rotating device, electrode lifting system, water cooling system, hydraulic system.
Loosen the furnace roof, install an observation device and a water-cooled feeding port on the furnace top.
Large cross-section water cooled power cables, tilting of submerged electric arc furnace body, lifting and rotating of furnace cover, all using hydraulic transmission.
The electrode lifting automatic regulator adopts; The electrode clamp is made of chromium copper, with stainless steel strap clamping, and has a long service life.
The high-voltage electrical control adopts a vacuum switchgear, which has complete detection and measurement of voltage, current, power, and electrical degree.
Transformer adopts a low loss and energy-saving transformer.
The low-voltage electrical equipment is controlled by a PLC programmable controller.
The cooling water system has pressure and water temperature monitoring, sound and light alarms.
The advanced and complete central centralized control system realizes the integration, intelligence, control, warning, and protection system of the production line, ensuring the safe and reliable operation of the production line.
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