Production Process

Nitrogen production and nitration furnaces

FeSi2 75%

Nitrogen Production Cell

Furnaces for production
Capacity: 45.000 MT/year

FeSi3N4 powder

Ball grinder for processing
FeSi3N4 powder (10MT/hour)

Quality Control equipment

Grindind mill and final quality control

Packaging and international expedition

Technical Features

Refractoriness exceeding
1700 °C (3092 °F)

High resistance to corrosion caused by liquid metals

Very stable chemically and thermally

High spalling resistance

Small thermal expansion rate

High thermal conductivity

Appropriate hardness


Grain Size Distribution, dry method:

Sieves (A STM) Minimum (%) Maximum (%)
140 (0,106mm) 5,0 12,0
200 (0,075 mm) 5,0 12,0
325 (0,045 mm) 10,0 20,0
Fines 55,0 --


Elements Minimum (%) Maximum (%)
a Si4N3 - 23,0
B Si4N3 59 23,0
Si4N3 - TOTAL 75 82,0
Si2ON2 -- 1,50
SiO2 crist -- 1,45
SiO2 amophous -- 1,50
Si -- 0,60
Fe 14,0 18,0


Elements Maximum (%)
Ca 1,50
Ti 0,15
Al 1,60

Big Bags of 1000kg.

Tap-Hole Clays

Tap-Hole Clays added with Ferrosilicon Nitride were developed to increase productivity and quality of metals produced in blast furnaces. Tap-Hole and gutter materials made with the addition of Ferrosilicon Nitride proved to be highly effective and are widely used by the leader companies of the steel industry that aim high performance for the blast-furnace production. Ferrosilicon Nitride content vary from 5 to 30% depending on the operating conditions, mainly the size of the blast furnace and the conditions of hot-metal and slag discharge.

Relation between level of Si3N4 and corrosion rate of tap-hole clays. Relation between level Fe-Sin and corrosion rate of tap-hole clays.


The introduction of Ferrosilicon Nitride increases the strength and wear resistance of the refractories at high temperature, increases their thermal stability and resistance to oxidation, and reduces the thermal-expansion coefficient, with simultaneous increase in thermal conductivity.
Ferrosilicon Nitride refractories have a smaller coefficient of thermal expansion compared to the silicon carbide and high alumina refractories. Ferrosilicon Nitride refractories are more resistant to abrasion by the hot metal and the slag and they do not shrink on repeated heating.

Rate of thermal expansion in relation to temperature of ferrosilicon nitride and refractory bricks

Metals & Steel

Ferro Silicon Nitride is an alloy additive in smelting of cold-rolling orientated silicon steel. Its addition increases strength and improves corrosion-resistance, thermal shock resistance and abrasion resistance of steels. In comparison with the traditional manganese and chromium alloys used for alloying in smelting corrosion-resistant steel, the consumption of the ferrosilicon nitride is considerably less.

An electric arc furnace is used during the smelting process of steel

Special Coatings

Due to the use of Ferrosilicon Nitride, it is possible to achieve temperature resistance and stable layers with excellent anti adherent properties in Casting Coatings and Industrial & Maintenance paints. Those properties are retained even in direct contact with liquid metals and slag. The layer can therefore protect the painted surface reducing wear and improving lubricating property.


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