Chemical enterprises chromium salt slag resources fire smelting
equipment
Production process:
The main raw materials of the special refining furnace, such as
calcium-free chromium slag pellets, calcium-vanadium slag, blue
carbon and silica, are respectively loaded into the distribution
bin, batted by the weighing and measuring system, and fed into the
feeding flat belt conveyor system through the lower mixing belt
conveyor. The charging flat belt machine sends the raw materials to
the high silo on the 17.50 meter platform of the electric furnace
for storage. The material is put into the top feeding bin of the
furnace by the distributing system composed of several belt sets,
and then measured and weighed into the furnace through the feeding
pipe in the furnace, and the thin material semi-open arc melting is
carried out by continuous power supply. The slag and hot metal are
discharged through the outlet, injected into the hot metal ladle
and the intermediate slag ladle, and most of the slag is removed by
high pressure water quenching method. After the oven is finished,
the molten iron is driven to the casting span, and after sedation,
the molten iron is cast to the ingot mold or continuous casting
machine, after natural cooling and crushing, the crane is lifted to
the iron box, and the cooling is finished into the warehouse.
The flue gas of the electric furnace enters the CO combustion
chamber, the smoke pipe is cooled, and the row pipe is cooled
(waste heat boiler) into the high-temperature bag dust collector
for treatment, and the dust is discharged after reaching the
discharge standard of iron and steel smelting. The dust dust enters
the temporary storage tank and is transported into the chromium
salt system.
Features of this refiner:
1. Compared with 3500kvA electric arc furnace, the smelting power
consumption of tons of products is reduced by 1830 degrees, down
28%.
9000kvA furnace smelting power consumption base is 4800 degrees /T,
the actual 4670 degrees /T; 3500kvA furnace smelting power
consumption standard is 6500 degrees /T; The 9000kvA furnace's
combined power consumption is 1830 degrees /T lower than that of
the 3500kvA furnace.
2.Low electrode consumption.
The 9000kvA furnace ton product consumes 0.012T of electrodes,
which is 43% of the planned, and less than 30% of the 3500kvA
furnace electrode consumption.
3. The power factor to meet the design requirements.
The design index of 9000kvA furnace power factor is ≥0.82, and the
power factor in actual operation is about 0.90.
4. Quality improvement.
The quality of large furnaces and smaller furnaces have also been
significantly improved, and the annual pass rate of ferrochrome has
reached an average of 89%, which is nearly 5% higher than the plan,
and the pass rate of small furnaces has increased by 20%.
5. Basically realized submerged arc smelting.
After a long time of exploration through the material ratio,
electrode insertion depth, load size and other adjustments to
basically achieve submerged arc smelting, furnace surface
temperature is much lower than the test process, the circulating
water temperature is significantly reduced.
