coke-dust

Fine coke, or coke-dust, affects the market at times as a rival; but fine coal, or coal-dust, never, because it would spoil the bricks.

International Weekly Miscellany - Volume 1, No. 8, August 19, 1850 Various

At this time the immediate cause of the explosion was unknown, but they could tell it was a "dust explosion" by the clouds of coke-dust, and no one who had been into the mine and seen its dry condition would doubt what they would find when they went down and traced out the "force" and its effects.

King Coal : a Novel Upton Sinclair 1923

The fire in the stove, having been covered with coke-dust, was still alight, and the remains of a stew which Goujet had put to warm, thinking he should return to dinner, was smoking in front of the cinders.

L'Assommoir ��mile Zola 1871