METHOD for bottom introduction of fine powders in liquid metal

摘要

A method for bottom introduction of fine powders in liquid metal in electric arc furnaces and steel teeming ladles of small and medium capacity through the bottom blowing device. The supply of transport gas is assumed with the fine powder simultaneously with the supply of pure purge gas purging into the bottom upgraded monoblock of fine bubble blowing, which is common for both of the processes, and the possibilities during the melting in an electric arc furnace or during the out-of-furnace processing of the molten metal in the ladle of variable shutoff of powder feed with extension of supplying of pure purge gas and passage the powders of the another composition or shutoff of purge gas supplying without disconnecting the powder supplying and the transition to the other composition of the purge gas.