noun.
The more or less viscid mud thrown down from dilute waste soap-liquors of wool-scouring, cotton-bleaching, and dyeing industries when such liquors are treated with crude aluminium sulphate and milk of lime. The remaining effluent is thus in a large measure purified, but the sludge thrown down has usually little value, even as a manure.
noun.
The precipitated solid matter in sewage, usually collected in settling-basins in sewage-disposal works after chemical treatment and filtration. Often pressed into cakes.
noun.
The sediment, in the form of a mud, which collects in a steam-boiler.
noun.
Incorrectly, by abbreviation, an opening in a steam-boiler for the removal of sludge or mud; also, the lid which covers such an opening.
noun.
A sand-pump or mud-pumping device for removing sludge from a sink or a bore-hole.
noun.
The silt-like deposit in the bottom of an electrolytic cell.
noun.
Mud; mire.
noun.
A pasty mixture of snow or ice and water; half-melted snow; slush.
noun.
In mining, the fine powder produced by the action of the drill or borer in a bore-hole, when mixed with water, as is usually the case in large and deep bore-holes. The powder when dry is often called bore-meal.
noun.
Refuse from various operations, as from the washing of coal; also, refuse acid and alkali solutions from the agitators, in the refining of crude petroleum: sometimes used, but incorrectly, as the equivalent of slimes, or the very finely comminuted material coming from the stamps. See Slime, 3.