Overview
High-temperature slag is a non-metallic byproduct formed during high-temperature industrial processes such as iron and steel production, coal combustion, and metal refining. It consists primarily of silicates, aluminosilicates, and calcium oxides, with variable amounts of other metal oxides depending on the source material. Slag forms when flux materials (e.g., limestone) react with impurities in the raw materials at temperatures exceeding 1200°C. The rapid cooling of molten slag determines its physical structure, producing either granular blast furnace slag or glassy air-cooled varieties. Modern slag utilization represents an important industrial recycling effort.
Physical and Chemical Properties
The physical properties of slag depend largely on its cooling method. Water-quenched slag forms granular particles with high porosity, while slowly cooled slag develops crystalline structures. Typical bulk density ranges from 1200-1800 kg/m³, with specific gravity around 2.9. Chemically, slag contains 30-45% SiO₂, 8-20% Al₂O₃, and 35-50% CaO in ferrous metallurgy applications. The presence of minor elements like manganese, sulfur, and iron oxides affects its reactivity. Some slag types exhibit pozzolanic or latent hydraulic properties when finely ground, making them valuable cementitious materials.
Main Applications
Approximately 80% of blast furnace slag finds use in cement and concrete production, where it improves workability and reduces heat of hydration. Ground granulated blast furnace slag (GGBFS) can replace 30-70% of Portland cement in concrete mixes. Other significant applications include road base construction (as aggregate), railroad ballast, and mineral wool production for thermal insulation. In agriculture, certain slag types serve as pH adjusters and micronutrient carriers. Emerging uses include wastewater treatment (phosphate removal) and geopolymer production.
Safety and Storage
Fresh slag may retain residual heat (200-400°C) for days after production, requiring careful handling. Workers should wear heat-resistant gloves, face shields, and respiratory protection when processing dry slag due to dust generation. Long-term storage should prevent leaching of potentially toxic elements. Stockpiles should be covered or contained, especially in areas with acidic rainfall. Before reuse, slag typically undergoes aging (weathered for several months) to stabilize its chemical composition and reduce free lime content that could cause volumetric instability.
B2B Procurement Guide
Industrial buyers should specify the slag type (blast furnace, steelmaking, copper, etc.), particle size distribution, and chemical composition requirements. Key quality indicators include basicity index (CaO/SiO₂ ratio), glass content (for GGBFS), and heavy metal concentrations. Reliable suppliers provide material safety data sheets (MSDS) and batch chemical analysis reports. Bulk shipments by rail or barge typically offer the best economics. For international trade, verify compliance with REACH and other regional regulations regarding byproduct classification and environmental standards.
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