Iron-Silicate fines

Due to the metallurgical process technology, the slag from the flash furnace and the converters contains residual copper which is extracted through grinding and flotation. Two products are obtained at the slag flotation plant: flotation copper concentrate and flotation product called fayalite or Iron-Silicate Fines (ISF). Fayalite is powdery material with a high content of iron and silicon dioxide in the form of minerals, mainly fayalite, magnetite, quartz, etc. The specific density of the material is about 3.6 g/cm3 (bulk density 2.4 g/cm3). Iron-silicate fines are used in the cement industry as a ferrous additive. Products of concrete based on iron-silica fines have superior properties. Such products are pavements, lego-blocks for construction of warehouse separation walls, ultra-high performance concrete façade panels, shielding concrete, deterring concrete elements, adhesives, and ceramic products.

Detailed reference on material specification, material safety data sheet, logistics and shipping options, can be obtained in our PDF brochures here.

Cement clinker production

ISF Ultra High Performance Concrete

ISF shielding concrete

ISF concrete for heavy concrete

ISF concrete for paving products

ISF de-icing concrete

ISF anti-skid surface coating

Coal flotation

ISF for ceramic production

Other uses

» Road construction: as an additive in bed structure stabilization and substitute for stone flour in asphalt;

» Pavement tails: as an additive to improve sintering and abrasion resistance;

» Reinforcement: coastal, riverside and landslide concrete elements;

» Backfilling: additive for underground mines and road construction.

Facts and figures



Iron oxide Fe2O3 


Particles smaller than 70µm 


Specific density

approx. 3.6 t/m­3

Bulk density

approx. 2.4 t/m­3

Moisture after filter-press

approx. 10%


Chemical composition



Fe elem.

46% (as Fe2O3>60 %)
















Benefits for cement industry

» Ready-to-use source of iron;

» No need for additional crushing and grinding;

» Suitable for both dry and wet clinker production lines;

» Good mixing properties;

» Promotes lower calcination temperature;

» Eliminates the need for mineralizers.


Concrete production

» Enhances workability (pump casting) of low-grade concretes;

» Increases the abrasion resistance of mortar during concrete casting;

» No influences on alkali-silica reaction (ASR);

» Improves compressive strength;

» Improves shrinkage and waterproofing;

» Enhances pozzolanic properties and concrete durability.