---
title: Electric Arc Furnace (EAF) Slag | one to ONE Holdings
description: "EAF Slag: Two types—Oxidizing Slag (high FeO, aggregate use) and Reducing Slag (high CaO, specialized use)—are key steel by-products."
image: https://www.o2oh.com/hubfs/o2Oh_18mm-1.jpg
---

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# Glossary

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# Electric Arc Furnace (EAF) Slag

Electric Arc Furnace (EAF) Slag is the primary by-product of recycling [scrap steel](https://www.o2oh.com/glossary/scrap-steel) and is distinguished into two main types resulting from the sequential refining phases.

Oxidizing slag is generated early, characterized by high iron oxide (FeO) content, which is key for impurity removal. This dense, hard material is typically processed into road aggregate.

The subsequent Reducing Slag, often produced in a ladle, is low in FeO but rich in calcium oxide (CaO) for desulfurization.

Their different chemical compositions require specialized treatment, but both are essential components in the steel industry's drive toward a [circular economy](https://www.o2oh.com/glossary/circular-economy) and reduced waste.

Diagram of DSTI’s 'Daiwa Z Process,' a unique in-line galvanizing method.

### RELATED WORDS

---

- [Endpoint Security](https://www.o2oh.com/glossary/endpoint-security)
- [End of Life (EoL)](https://www.o2oh.com/glossary/end-of-life-eol)
- [Emission Factor](https://www.o2oh.com/glossary/emission-factor)
- [ESG Reporting](https://www.o2oh.com/glossary/esg-reporting)
- [EPD (Environmental Product Declaration)](https://www.o2oh.com/glossary/epd-environmental-product-declaration)
- [Electrolyzers](https://www.o2oh.com/glossary/electrolyzers)
- [Electro-Galvanized (EG) Process](https://www.o2oh.com/glossary/electro-galvanized-eg-process)

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