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深度还原-磁选技术可以高效回收鲕状赤铁矿石中的有价组分铁.为查明还原温度对鲕状赤铁矿石还原特性的影响规律,采用热重差热分析、X射线衍射和扫描电子显微镜等对不同还原温度下鲕状赤铁矿石还原产物的物相组成及微观结构进行研究.结果表明:鲕状赤铁矿石具有良好的热稳定性,其熔化温度为1 312℃;还原过程中还原产生的FeO会与脉石矿物反应,生成铁橄榄石和尖晶石;还原温度是影响该矿石还原过程中物相转变和微观结构破坏的关键;还原温度越高,还原产物的物相组成越简单,矿石鲕粒结构破坏程度越严重.
Deep reduction - magnetic separation technology can efficiently recover valuable iron in oolitic hematite ore.In order to find out the effect of reducing temperature on the reduction characteristics of oolitic hematite ore, thermogravimetric differential thermal analysis, X-ray Diffraction and scanning electron microscopy were used to study the phase composition and microstructure of the reduced products of oolitic hematite ore at different reduction temperatures.The results show that the oolitic hematite ore has good thermal stability with a melting temperature of 1 312 ℃. The FeO produced during the reduction process reacts with gangue minerals to form fayalite and spinel. The reduction temperature is the key to the phase transformation and microstructure destruction during the reduction of the ore. The higher the reduction temperature, The simpler the phase composition of the product, the more serious the destruction of the ore oolitic structure.