褐铁矿的热分解特性及其对烧结过程的影响

利用热重分析的方法对褐铁矿FMG粉(简称FMGF)在受热升温过程的热分解特性进行了详细的研究.结果表明:FMGF中的结晶水在200~400℃温度区间内即完成了分解挥发，这样可以改善烧结料层透气性，使料层上部热量有效传递到下部；分解其中的结晶水，就能减少褐铁矿中的结晶水分解对烧结固体燃料消耗和烧结热平衡影响.烧结杯试验和工业应用结果验证了热分解特性研究的结论:在高比例褐铁矿条件下，通过提高难熔矿配比，可改善烧结料层透气性，改善料层传热条件，最终降低烧结固体燃耗，提高烧结成品率.

Thermal Decomposition Characteristics of Limonite and Their Influences on the Sintering Process

The thermal decomposition characteristics of FMGF were investigated by the thermolgravimetric analysis. The experimental investigation showed that the decomposition of crystal water in FMGF completed when the temperatures were in the range of 200~400℃， which improved the gas permeability of the sintering layers that the heat from upper layers transferred to the lower layers effectively. The crystal water was decomposed so that the effects of crystal water decomposition in the FMGF on the solid fuel consumption and energy balance were reduced. The conclusion made from the thermal decomposition analysis was verified by the sintering pot tests and industrial application， which indicated that the rate of finial products of the sintering was increased and the solid fuel consumption was reduced under high proportion of limonite through increasing the proportion of iron ore fines with low assimilative capacity to improve the gas permeability of the sintering layers and the heat transfer.