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We have developed an experimental device for studying the main mechanism ofdust formation in electric arc furnace steelmaking: the burst of gas bubbles atthe liquid steel surface. As in the case of the air-water system, thebubble-burst process takes place in three steps: breaking of the film cap,projection of film drops, and projection of jet drops. The film break and thejet drop formation are observed with a high-speed video camera. The film dropaerosol enters a particle counter, which characterizes the drops in size andnumber. Results are presented and discussed. The quantification of both typesof projections leads to the conclusion that the film drop projections representthe major source of dust. The amount of film drops greatly decreases with theparent bubble size. Bubbles with diameter under 4mm theoretically do notproduce film drops. Decreasing the CO-bubble size enough would thereforerepresent an effective solution for reducing drastically the electric arcfurnace dust emission.

Dust formation by bubble-burst phenomenon at the surface of a liquid steel bath