Steel Slag

Explore the latest research, scientific studies, agricultural applications, environmental assessments, and sustainability developments related to Steel Slag. Stay informed on soil amendments, mineral fertilizers, soil health, nutrient management, carbon sequestration, circular economy, crop productivity, and sustainable agriculture.

Steel slag is a mineral-rich co-product generated during steelmaking processes such as basic oxygen furnaces (BOF), electric arc furnaces (EAF), and induction furnaces. While traditionally used in construction and other industrial applications, research is increasingly examining its potential as an agricultural soil amendment and mineral fertilizer. Steel slag can contain useful amounts of calcium, silicon, magnesium, phosphorus, iron and manganese, while its alkaline properties can help address soil acidity and influence nutrient availability.

In agriculture, steel slag is being investigated for its ability to raise soil pH, improve nutrient availability, enhance soil properties, support crop growth, and potentially reduce certain greenhouse-gas emissions. A 2026 study developed machine-learning models to predict the soil-pH improvement resulting from steel slag applications, highlighting the potential for more targeted use based on soil and crop conditions.

Recent research has also examined steel slag as a source of plant nutrients. A 2025 study on ladle-furnace slag found that controlled nutrient release could provide calcium, magnesium, iron and manganese, while low concentrations improved root development in tomato plants under the tested conditions.

However, agricultural use requires careful assessment of slag composition, application rates, soil characteristics and potential contaminants. In particular, researchers have identified chromium and other heavy metals as important safety considerations because their availability and potential uptake by crops can vary according to slag type and soil conditions.

This category features steel slag research, soil amendment technologies, mineral fertilizers, soil acidification, nutrient management, crop trials, heavy-metal risk assessment, carbon sequestration, circular-economy initiatives, industrial by-product recycling, and sustainable agriculture developments.