Effect of carbon concentration in molten metallic iron on slag-metal separation temperature

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Oral Presentation Process operations in coal based smelting reduction processes (COREX, FINEX etc.)


Prof. Ko-ichiro Ohno (Kyushu University)


Toward to “Zero carbon emission” from steel industry, suppression of greenhouse gas emission from ironmaking process should be one of the most important issue. Although one of the promising technologies is hydrogen ironmaking, produced iron should be melted for refining process. Especially, slag-metal separation is necessary for purification. From this point of view, a certain amount of carbon should be necessary to smooth the separation. In order to estimate minimum necessary carbon for slag metal separation, iron-carbon-slag mixture melting and separating behavior was investigate with in-situ observation technique using laser microscope with infrared furnace. The mixture, different kinds of slag compositions were adopted to change their physical properties; melting temperature, viscosity, surface tension, etc. And also, mixing carbon ratios in the mixture were varied to change carbon concentration in metallic part. Following results were obtained. The metal-slag separation behavior was dominated largely by agglomeration behavior of liquid phase of iron. Residual of solid iron phase and/or solid slag phase basically prevent the separation behavior. In other words, the separation surely occurs when both phases of iron and slag change to liquid phase of them. However, the separation can also occur even if a small amount of solid phase still remains in the mixture.
Speaker Country JAPAN

Primary author

Prof. Ko-ichiro Ohno (Kyushu University)


Prof. Kazuya Kunitomo (Kyushu University) Prof. Shungo Natsui (Tohoku University) Prof. Sohei Sukenaga (Tohoku University) Prof. Takayuki Maeda (Kyushu University)

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