from The Century Dictionary.
- noun The dust which collects in the flue of a metallurgical furnace, and which contains some very fine particles of metal, usually in the form of oxids.
Sorry, no etymologies found.
Selenium is usually obtained from the flue-dust or chamber deposits of some factory where sulphuric acid is made.
The metal is usually obtained from the flue-dust (produced during the first three or four hours working of a zinc distillation) which is collected in the sheet iron cones or adapters of the zinc retorts.