An apparatus of the differential thermal analysis under high pressure (approx. 100kg/cm2, max. temp. 700°C) was used to investigate carbon deposition in CO atmosphere during the reduction.
Pulverized hematite are (Swaziland, Brazil), magnitite are (Mosan) and carbonyl iron powder wereused as test samples. The results were as follows.
When initial CO pressure was 20kg/cm2, the carbonization of CO took place at around 390°C on hematite and at 4302 on magnetite. When the pressure was increased to 50kg/cm2, it was observed that the reaction temperature was lowered by abut 402. It was also confirmed that metallic iron played as catalizer for the carbonization of CO at around 550°C.
