Formation of ZnO-containing Dust from Zn-bearing Steel Melts.

概要

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The formation mechanism of ZnO-containing dusts was studied using an apparatus where the evaporation and formation of dust from liquid iron was controlled by the composition of an Ar-O2 gas stream. The investigations were made at 1600°C and oxygen partial pressure of 0 to 1 bar in the gas phase. It was shown that he total amount of the dust increased with increasing oxygen partial pressure until a maximum value was reached. Futher increase of pO2 resulted in a reduction of dust formation and its complete prevention at pO2–0.8 bar. The rate of zinc evaporation also attained a maximum with increasing oxygen partial pressure, while evaporation of iron slightly increased up to an oxygen partial pressure of 0.5 bar. The observed experimental results are described with the aid of a kinetic model. Analysis of size distribution and structure of oxide particles indicates that 20% of particles are smaller than 1 μm and 50% smaller than 4 μm. It is concluded that evaporation and dust formation are controlled and can be optimized by changing process parameters scuch as composition of the Ar-O2 gas. Further decisive parameters such as gas flowrate, temperature and stirring intensity of the melt were kept constant in the present work.
The Iron and Steel Institute of Japanの論文