Non-isothermal reduction characteristics of roasted high alumina iron ore pellets. (3rd April 2017) - Zhang, Zuo Liang
ABSTRACT: Non-isothermal reduction of roasted Guangxi high alumina iron ore pellets with CO and H2 was conducted with high temperature synchronisation thermal analyser (NETZSCH STA 409C/CD) to understand the reduction characteristic of the ore. Chemical analysis, X-ray diffraction examination and scanning electron microscope analysis were adopted to analyse the roasted and reduced pellets. The results show that there are three main phases of Fe2 O3, Al2 O3 and Al3 Fe5 O12 in the roasted pellets. During reduction process, the iron bonded in hercynite and fayalite is difficult to be reduced by CO so that the final reduction degree is only 35.62% at the setting temperature of 1573 K. But with H2 atmosphere, the reduction degree can reach 100% at about 1520 K. It suggests that the ferric ion can completely be reduced to metallic iron by H2 .