12500kVA Submerged Arc Furnace

12500kVA submerged arc furnace, industrial silicon submerged arc furnace;

The main equipment adopts the semi-enclosed fixed furnace type with short hood;

For smelting industrial silicon alloys;

The minimum daily output is 40t;


Industrial silicon 12500KVA submerged arc furnace (SAF) smelting varieties and output:

Industrial silicon alloy, the minimum daily output of a single unit under the rated capacity is 40t, and the annual output is 13200t;

Power consumption:

8800KW h/t

Annual working hours:

330 days


Main technical parameters of SAF-12500kVA industrial silicon furnace

Transformer Rated Capacity
Transformer Primary Voltage
Primary Current
Transformer Secondary Voltage Range
126-138~156, (level 11, step difference 3V)
Low Voltage Side Rated Voltage
Transformer Secondary Working Current
Electrode Diameter
Furnace Diameter
Furnace Depth
Furnace Shell Diameter
Furnace Shell Height
Electrode Pole Center Circle Diameter
Number of Taps / Angle
Enclosed Low Hood Diameter / Height
Electrode Stroke
1500  Maximum 1700
Electrode Lift Speed
Electrode Current Density
Natural Power Factor
Electrode Conductive Copper Tile
Group/Per Root
Cooling Water Consumption
Cooling Water Pressure
Hydraulic System Working Pressure

Process Flow of 12500KVA Submerged Arc Furnace

This technical scheme is designed to produce a furnace every 2 to 3 hours, 3 to 4 furnaces per shift, and about 40 tons of industrial silicon alloys are produced every day.

(1) Preparation of Raw Materials:

Silica, coke and other raw materials are transported into the factory by trucks and weighbridges. After crushing and sorting, qualified materials are stored in the raw material yard;

(2) Weighing Ingredients:

Various raw materials are weighed and batched by electronic scales according to the formula requirements of the smelting alloy, and the mixed charge is added into the furnace in batches.

There Are Three Feeding Methods:

Method 1: Manual manual trolley, before being transported to the 5-meter platform furnace, manually added in batches.

Method 2: The hopper is mixed, and the inclined bridge belt conveyor is transported to the top of the low smoke hood and added to the furnace, and at the same time, the artificial feeding is used to assist the feeding.

Method 3: Mechanical mixing, electronic weighing, transporting the inclined bridge hopper to the 18.5-meter platform, and manually adding the circular distribution car.

(3) Electric Furnace Smelting:

The charge enters the semi-closed submerged arc furnace, and the current is introduced into the furnace through the three-phase electrode by the transformer.

The electrode generates arc heat with the charge and transmits it to the furnace filled with charge, and is reduced to the basic iron alloy by the arc heat and resistance silica.

During the whole smelting process, the intensity of the voltage and current on the electrode is set according to the process parameters, and the values ​​of the voltage and current are also different in different periods.

That is to say, the power input into the furnace is different, the electrode is always firmly inserted into the charge in the furnace, the gas escapes evenly from the entire material surface, the arc is not exposed from beginning to end, and the mixed charge is added in small batches as the material surface decreases. In the furnace, keep the material surface in the furnace at a certain height.

There is a cone shape around the electrode, and the molten iron generated by reduction in the furnace is exported when a certain amount is stored.

(4) Molten Iron:

Open the furnace eye with a burner and round steel, and release the ferrosilicon alloy to the ladle, with the alloy at the bottom and slag and impurities above.

Remove the slag and impurities floating on the upper part. Slag removal can be done by water quenching or natural cooling.
The 12500KVA ferrosilicon submerged arc furnace taps iron every 2 hours, about 2~3 tons of ferrosilicon alloy at one time.

(5) Casting:

After slag removal, the ferrosilicon alloy in the ladle is cast into ingots. Casting can choose the following three methods:

1. Steel ingot mold casting.

2. Ground mould casting

3. The ingot casting machine casts ingots. Ingot casting machine casting.

(6) Broken:

The alloy ingots are cooled and crushed and then transported to the finished product warehouse.

(7) Dust Removal:

The smoke and dust enter the dust exhaust flue through the furnace mouth and the upper smoking hood, and the discharged smoke and dust are treated by dust removal equipment to meet the emission requirements.

Dust removal equipment can choose bag filter or water curtain dust removal equipment according to local environmental protection policy requirements, or directly discharge into the atmosphere.

(8) Circulating Cooling Water:

The circulating cooling water is supplied by the circulating water pump station. After entering the electric furnace cooling equipment, the cooling water is returned to the cooling pool by the gravity of the drop. After natural cooling in the pool, the water is supplied to the front of the furnace by a water pump.

The whole electric furnace cooling water is open circulation.

The cooling water circulation capacity of the 12500KVA submerged arc furnace is 250t/h.

According to the different requirements of customers, more specific solutions will be given


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