Reactivity of heat-treated coals in carbon dioxide at 900 °C

Effect of Coal Type on the Reduction and Magnetic Separation of a High-phosphorus Oolitic Hematite Ore

“…Whereas the contribution of volatile matters on the reduction of iron oxides can be negligible since they almost completely released before the sample temperature reaching an active temperature of reduction reaction, and this also confirms that the reactivity of coal plays a critical role in the reduction process. Particle size reduction of coal has a great effect on increasing reactivity, 20) and consequently promotes the reduction of iron oxides and inhibits the growth of the iron grains, and this explained why the iron content of the DRI powder decreased as the particle size of coal reduced. In addition, the iron recovery was just 65.95 mass% when coarse-sized anthracite was used at the C/O ratio of 1.0 as shown in Fig.…”

Thermochemistry and kinetics of oxygen interaction with microporous chars. Technical report 12. [199 references]

“…For the chars used in the present study, gasification data (at higher temperatures) were available. These include gasification in air at 405°C (196), in C0 2 at 900°C (197), in steam at 9l0°C (198), and H 2 at 980°C (199). We have tried to correlate values of Q 15 (cal/g char) for the chars exposed to oxygen at l00°C with some gasification parameters, for example; Rr and To.s, where RT is the maximum rate of gasification at temperature T,and To.s .... …”

The Influence of Potassium on the Boudouard Reaction in Manganese Production

“…The rate of the Boudouard reaction is dependent on many factors including carbon properties, partial pressure of CO 2 and the presence of catalytic compounds of which potassium is the most important. In general, the reaction rate increases with temperature and is higher for carbon of low anisotropy, [3][4][5][6] high surface area, [7][8][9] and high partial pressure of CO 2 . 10,11) The catalytic effect of alkali compounds was confirmed in many investigations with potassium acting as the strongest catalyst.…”