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Metal slag appears as a byproduct of smelting cast iron in converter furnaces for steel production. Phosphorous impurities in the iron react with the furnace lining, float above the molten iron, and then form a dark porous mass. Slag acts as an alkaline fertilizer suitable for acidic or neutral soils, and its effectiveness is limited to these types of soils.
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The composition of slag varies, and it is also known as "Thomas phosphate" after one of the innovators of furnace lining. Generally, the fertilizer contains 10 to 25% pentavalent phosphorus oxide in the form of calcium quadruple phosphate, which dissolves in water with difficulty and slowly, along with oxides of magnesium, silicon, and iron.
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Slag is considered a crucial element in metal extraction through thermal processes, performing chemical and physical tasks ranging from aggregating metallic impurities and oxides to absorbing impurities in metal refining stages. Slag also aids in protecting molten metals from oxidation and reducing heat loss. In electric arc furnaces, slag is used as a means of thermal resistance.
Uses of slag
Construction gravel
Cement manufacturing
Soil Improvement
Surface Cleaning
Due to its strength and effective abrasiveness, slag is an excellent choice for surface preparation and cleaning in industrial areas. It efficiently cleans surfaces from paints, rust, and various types of deposits.
Production of lightweight concrete blocks
