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Home Material Sciences Technology for Producting Ferrosilicium

Technology for Production Ferrosilicium from Ash Waste of Thermal Power Stations


Granulated ferrosilicium is received by restoring part of oxides from slags obtained as a result of coal burning, separation and recovery of a restored metal component. The restoration process is conducted in the boiler units of thermal power stations with liquid slag removal.

Scheme of catcher for removing of metal granules from slag insystem of water and ash removing:
1 - ash and slag conductor; 2 - diffuser; 3 - window of catcher; 4 -catcher; 5 - cone; 6 - watch window;
7 - storage device forgranules.

The technology has been mastered to obtain ferrosilicium granules with a silicon content from 14 up to 25 percent, the rest being iron with inclusions not greater than: carbon - 1.5, sulphur - 0.3, phosphorus - 0.8, aluminium - 0.3, vanadium - 0.4, titanium - 0.6, nickel - 0.3 percent.

The dispersivity of separated granules of the following fractional composition.

The density of material is 6.3 - 6.9 g/sm3, the bulk weight being 4-4.2 g/sm3. The technology can be practically used at all thermal power stations operation under various slag removal conditions on anthracites, bituminous lean, baking and cooking coals, and also on a number of hydrogenous coals.

The average output of metal granules under usual conditions of furnace process (without thermochemical action on the slag) is
03-2 percent of the slag weight.

View of metal granules
View of metal granules

Areas of Application

Foundry industry

Contact Details

Organization: Physico-Technological Institute of Metals and Alloys of NASU.
Address: 34/1 Vernadsky Avenue, 03680, Kiev-142, Ukraine.
Tel. (044) 444-35-15.
Fax (044) 459-50-29.
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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