Abstract
The influence of reduction temperature and gas composition on sticking behaviour of vanadium titano-magnetite oxidised pellets was investigated in this work. It was found that the sticking index (SI) increased with temperature and CO content of gas mixture. Microstructure transformation of sticking interfaces under different temperature and gas compositions was analysed by SEM. Coating is an effective way to prevent sticking. Compared with MgO and CaO, recyclable Ti-bearing tailing is the most suitable coating material to prevent sticking behaviour of vanadium titano-magnetite pellets. The SI of pellets decreased significantly by coating Ti-bearing tailing with little influence on metallisation rate. It was indicated in SEM and EDS that spinel (Fe2TiO4), as the main component of minerals in Ti-bearing tailing, decreased the hooking opportunity of newly formed metallic iron between pellets by building spacers between pellets, which was applied to solve the sticking problem.
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