ガス吹込み下での溶融 Cu 中 SiO_2 介在物のスラグへの除去速度

概要

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Kinetic studies have been made on SiO_2 inclusion removal from molten Cu to Li_2O-SiO_2-Al_2O_3 slag under Ar gas injection stirring condition. The effect of gas injection on the inclusion removal rate has been investigated. Experiments were done at 1523K. The gas flow rate of injected Ar was in the range of 3∿60cm^3/s under the conditions of 1523K and 1.013×10^5Pa. The crucible diameters were 30, 40, 60, and 75mm. During each experimental run, the frequency of bubble formation was measured by means of a pressure pulse technique. The bubble size ranged from 7 to 18mm. From the [mass%O]_T-time relation, the rate constant of inclusion removal, k_o, was obtained. It is shown that k_o increases with increasing Ar gas flow rate, V_g. The rate of inclusion removal increases with increasing gas-metal interfacial area. A mathematical model is developed to explain the experimental result. In the model, the inclusion particles are assumed to adhere to the gas bubble-metal interface during the bubble formation and ascent periods. The apparent mass transfer coefficient, k_m, for inclusion removal obtained experimentally is independent of the gas flow rate and the crucible diameter. Thus, it is considered that the inclusion particles are removed from the melt mainly through adhesion to the gas bubble-metal interface.
社団法人日本鉄鋼協会の論文
1994-03-01