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. 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). Some of the iron-silicate fines are used in the cement industry as a ferrous additive. They can also be used in other areas of construction and as an initial raw material in iron production.
Facts and figures
Iron oxide Fe2O3
Particles smaller than 70µm
approx. 2.4 t/m3
approx. 3.6 t/m3
Moisture after filter-press
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.
» 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.
» Road construction: as an additive in bed structure stabilization and substitute for stone flour in asphalt;
» Bricks: partial substitute for natural clay – reduces shrinkage and enhances color;
» Pavement tails: as an additive to improve sintering and abrasion resistance;
» Reinforcement: coastal, riverside and landslide;
» Iron making: iron-bearing material for sinter and pellet production;
» Backfilling: additive for underground mines and road construction.