Schlacke — meaning in English

English meaning

cinder noun A small piece of partly burnt coal, wood, or other material left after combustion.
clinker noun A very hard brick, traditionally made in the Netherlands, used for paving.
dross noun Rubbish or unwanted, impure material.
slack adj Loose; not pulled tight.
slag noun Waste material left over after smelting ore.

Schlacke is used for these senses in English:

cinder Slag from a metal furnace.
clinker Slag or ash produced by intense heat in a furnace, kiln or boiler that forms a hard residue upon cooling. [from 18th c.]
dross Residue that forms as a scum on the surface of molten metal from oxidation.
slack In particular, a shallow dell or hollow; a dip in the surface of terrain, such as between hills.
slack (countable) A low-lying marsh or a pool, especially a tidal or intermittent one which periodically fills and drains.
slag Impurities formed and separated out when a metal is smelted from ore; vitrified cinders.
slag Scoria associated with a volcano.

noun A very hard brick, traditionally made in the Netherlands, used for paving.
noun A lump formed when bricks melt together under great heat.
noun The hard ash left behind after a furnace, kiln or boiler has burned at very high heat.
noun A lumpy material made by heating limestone and clay together in a kiln, used as a step in making cement.