Abstract
Titanium compounds, so-called titanium-bear, are generally formed in the blast furnace hearth, because iron ore contains more or less titanium oxide. Physico-chemical examinations on the titanium compounds picked up from the blown-out blast furnace hearth were carried out.
It was found that the titanium compounds are TiC-TiN solid solution and a section surface of the crystal seems to be an annual ring consisting of many layers, of which color changes corresponding to the carbon / nitrogen concentration ratio. This is also related to the condition of circumstances, such as the temperature, partial pressure of nitrogen, and motion of molten iron, at which the crystal grew. Therefore, the titanium compounds, which had grown over long period, reflect the course of operation of the blast furnace.
