中南大学学报（自然科学版）2013，Vol.44Issue(4)：1305-1311,7.
内配煤用量对某难选铁矿石压块直接还原焙烧的影响
Effect of coal dosage on direct reduction roasting of refractory iron ore briquettes
摘要
Abstract
The mechanism and factors affecting the direct reduction roasting of refractory iron ore briquettes were investigated. Raw ore crashed to less than 4 mm was mixed with certain dosage of binder C and reductant coal for briquetting. A series of tests were carried out and the optimum condition was determined. The briquettes with different coal dosages after reduction reaction were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that there is not only the reduction of ferric iron to ferrous or metallic iron, but also the reaction of wustite with gangue in the ore which formed fayalite and spinel. Therefore, increasing the coal dosage in the briquettes improves the reduction of iron oxide and fayalite to metallic iron. The obvious connection and growth of metallic iron crystals appear in the briquettes with more coal dosage, the boundary between metallic iron crystals and grey slag is clear in the briquettes, thus, the iron recovery rate of direct reduction iron is higher than that obtained with less coal dosage. The direct reduction iron (DRI) with 90.05% iron grade and 91.26% recovery rate was obtained.关键词
内配煤用量/难选铁矿石/压块/焙烧Key words
coal dosage/ refractory iron ore/ briquetting/ roasting分类
矿业与冶金引用本文复制引用
魏玉霞,孙体昌,寇珏,余文,曹允业..内配煤用量对某难选铁矿石压块直接还原焙烧的影响[J].中南大学学报（自然科学版）,2013,44(4):1305-1311,7.基金项目
国家自然科学基金资助项目(51074016) （51074016）
