page_title: Slag
hierarchical_section_title: Slag
caption_attribution_description: Slag heap in Clarkdale, Arizona, showing how it was held back with corrugated sheets, and them rusting away and the striations
context_page_description: Slag is the glass-like by-product left over after a desired metal has been separated from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. However, slags can contain metal sulfides and elemental metals. While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. In some smelting processes, such as ilmenite smelting to produce titanium dioxide, the slag is the valuable product instead of the metal.
context_section_description: Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore.  Slag is usually a mixture of metal oxides and silicon dioxide. However, slags can contain metal sulfides and elemental metals.  While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. In some smelting processes, such as ilmenite smelting to produce titanium dioxide, the slag is the valuable product instead of the metal.
caption: A path through a slag heap in Clarkdale, Arizona showing the striations from the rusting corrugated sheets retaining it.
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