気泡による溶鋼中介在物の付着分離に関するコールドモデル実験

概要

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Cold model experiments have been done on entrapment of inclusions in steel by inert gas bubbles. A water-air system has been adopted and the teflon, polystyrene, polyethylene, polypropylene and polycarbonate particles (dia.=100∿800μm, ρ_p=0.89∿2.2g/cm^3) were used in the experiments. The collision-trapping rates V(n_p/cm^3s) of various particles with bubbles were measured, and the effects of water-particle contact angle, φ, the particle diameter, d_p, the bubble diameter, d_b, the particle density, ρ_p and the frequency of bubble which passed through a unit volume of water have been investigated. It is found that V increased with increasing φ, and there is a critical φ_c above which the V is independent of φ, and in this case the bubble surface resistance can be neglected in the collision-trapping process. The particle mass transfer coefficients κ(cm/s) have been measured under the condition that the surface resistance could be neglected, and an equation of the relation between κ and d_b, d_p and ρ_p has been obtained.
社団法人日本鉄鋼協会の論文
1992-08-01