Abstract:

Dispersive purging plugs without purging by oxygen were prepared with corundum and spinel as the main raw materials, alumina and silica fume as additives, adopting a certain particle size distribution and moulding by casting. Physical properties such as bulk density and compressive strength were determined, and the using effects were tested on a ladle of 180 tons. The results show that the bulk density is greater than or equal to 2.8g·cm-3, the compressive strength is greater than or equal to 65MPa and the apparent porosity is less than or equal to 26%; the blowing-though rate is higher than slit purging plugs, and the service life increases by 30% or higher; the consumptions of oxygen blowpipe and oxygen as well as nitrogen are reduced by 90%; the residual plugs are longer; the operation is safe and the economic benefit is remarkable.