スラグ-溶銅間シリコン酸化反応系における物質移動速度

概要

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A kinetic study has been investigated on the reaction between molten Cu-0.1%Si alloy and a Li_2O-SiO_2-Al_2O_3-FeO slag. The explored reaction was <Si>___-+2FeO=SiO_2+2<Fe>___-. The metal-slag melt was stirred by an alumina rod. The experimental temperature was 1250℃. In one series of experiments, initial FeO contents of slag were varied from 5 to 15% at a constant rotational speed of the stirrer (200 rpm). The rate data could be represented apparently by linear relationship between log[%Si] and the time (t). Apparent mass-transfer coefficients of Si in metal, k′_Si, were calculated. At initial FeO contents, (%FeO)_0, below 9%, the reaction rate is controlled both by Si transport in the metal phase and FeO transport in the slag phase. At (%FeO)_0≳9%, the reaction rate is controlled only by Si transport in the metal phase. In another series of experiments, the stirring speed was varied as 70∿400 rpm at (%FeO)_0=9%. The mass-transfer coefficients, k′_Si, were found to be proportional to the 0.5 power of rpm of the stirrer. This experimental finding can be ascribed to the fact that the reaction is of mass-transfer controlled. The present reaction system has been established as a suitable model for the purpose of investigating the role of stirring in slag-metal reactions at high temperatures.
社団法人日本鉄鋼協会の論文
1985-07-01