Dust removal from arc furnace exhausts - using injection of auxiliary particulate material esp. furnace feed to scavenge dust and ease sepn

Dust laden gas streams from electro-smelting furnaces are cleaned by a dry separation process. The very fine dust is removed by first injecting a granular or powdered auxiliary material in a homogeneous suspension. The gas stream so charged is then fed into a conventional separation process. The fine dust is adsorbed onto the surface of the coarser material injected into the gas stream. One of the raw material fed to the furnace is a suitable injection material. Esp. for dust removal and recovery from arc furnaces e.g. in carborundum manufacture. Avoids the need to use filters which are difficult to clean and tend to blind rapidly. The separation can be carried out on cyclones.