Foaming slags

By tire coiTect choice of the metal oxide/carbon ratio in the ingoing burden for the furnace, the alloy which is produced can have a controlled content of carbon, which does not lead to the separation of solid carbides during the reduction reaction. The combination of the carbon electrode, tire gaseous oxides and the foamed slag probably causes tire formation of a plasma region between the electrode aird the slag, and this is responsible for the reduction of elecU ical and audible noise which is found in this operation, in comparison with tire arc melting of scrap iron which is extremely noisy, and which injects unwanted electrical noise into the local electrical distribution network. 

Foamed slag has been used as a lightweight aggregate for Portland cement concrete... 

Foams are widely used in iron- and steelmaking process since they provide rapid refining of the metal droplets held in the foam as a result of the enormous (surface area/mass) ratio. Foaming slags are also used on Electric Furnaces (EAPO to stabilise the arc and improve energy efficiency. 

Foaming slags are preferred to exposed arcs in EAF since they provide the following advantages ... 

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