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以鄂西某鲕状赤铁矿为研究对象,考察了焙烧时间对其磁化焙烧与磁选过程、相态转化及焙烧变化规律的影响.结果表明,含铁鲕粒多数由赤铁矿内核与致密同心外壳及其中间夹带的脉石矿物构成;含铁(TFe)49.02%的鲕状赤铁矿在800℃下磁化焙烧60 min后再用磁选管分选,获得含铁56.34%、铁回收率为88.05%的较好结果,焙烧时间对磁化焙烧影响显著.磁化焙烧过程仅改变铁相,而鲕粒结构未变;磁化还原由表及里受扩散作用控制,还原程度随焙烧时间延长逐步增加.800℃下焙烧时间小于30 min时,极少过还原生成FeO,之后则有少量FeO生成,较少形成Fe2SiO4;含磷与含硅矿物均有相变,但转变时间不同.
Taking an oolitic hematite in western Hubei Province as the research object, the effects of roasting time on the magnetization roasting, magnetic separation process, phase transformation and calcination were investigated.The results show that most of the iron oolites are composed of hematite core and Dense concentric shell and gangue entrained gangue minerals. 49.02% of iron-bearing oolitic hematite was magnetized at 800 ℃ for 60 min and then separated by magnetic separator to obtain 56.34% iron, iron The recovery rate is 88.05%, the roasting time has a significant effect on the magnetization roasting.The process of magnetization roasting changes only the iron phase, but the oolitic structure does not change.The magnetization reduction is controlled by diffusion in the table and in the inside, the degree of reduction is prolonged with the roasting time Gradually increase.When the calcination time is less than 30 min at 800 ℃, FeO is generated with minimal over-reduction, then a small amount of FeO is formed and Fe2SiO4 is less formed. Phosphorus and silicon-containing minerals both have phase transition but different transition time.