Slag — Minecraft block

Slag is the byproduct of IndustrialCraft 2's Blast Furnace when smelting Steel. Each Blast Furnace cycle in IC2 Experimental consumes an iron source — Iron Ingots, Iron Ore or Iron Dust — plus 6 Compressed Air Cells filled at a Compressor, then outputs Steel Ingots together with Slag at a steady 1:1 ratio — one per Steel Ingot. Slag is a recycling-economy material: it represents the leftover impurities that the Blast Furnace separates from refined Steel. The item uses a grey-brown crushed texture and stacks up to 64 in the inventory. Slag is not placeable — it is an item, kept in chests, Drums or sorting pipes next to your steel line. The documented use for Slag in IC2 is the Thermal Centrifuge, which yields Coal Dust and a Tiny Pile of Gold Dust, so the byproduct feeds back into dust production. In IC2 setups, players either route Slag straight into a Thermal Centrifuge or store it as a record of how much Steel a base has produced. Because Slag scales 1:1 with Steel production, it is a reliable indicator that the Blast Furnace pipeline (heat source, iron supply, Compressed Air Cell input) is running stable. Keep Slag separated from Steel Ingots in the output buffer of your Blast Furnace to avoid mixing it into automated Steel crafting recipes.