Iron slag is generated from Blast Furnace (BF slag) in the iron production, with 220–370 kg slag per ton of iron being produced. The amount of BF slag is the largest among the ferrous slags. Nowadays almost 100% of BF slag is utilised in many areas, such as cement production, road construction, civil engineering work, fertiliser production, landfill daily cover, soil reclamation, and so on. Since BF slag contains little iron (Fe < 2%), recovery of metals from BF slag is not important. However, steel slag is usually subjected to metal recovery prior to its application outside the iron and steel making process. Steel slag is produced from Basic Oxygen Furnace (BOF steel slag) and Electric Arc Furnace (EAF steel slag) in the steel making. They are about 10–15% by weight of the steel output. The iron and steel industry has applied mineral processing technology to recover steel scrap (Fe: 90%) and iron oxide concentrate (Fe≥55%) from steel slag and use them as feed materials for sintering, blast furnace and steel making.
The methods for slag processing are different, depending on chemical and mineralogical composition of steel slag, and its application. In general, steel slag processing includes crushing or grinding, screening, classification, magnetic separation, dewatering, and filtration. As we are BAS; we do all laboratory studies, general and detalied engineering, correct magnetic separation methods are provided on a turnkey basis.