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The influence of temperature on phase transformations of the minerals present in the red mud: reduction of hematite to magnetite

机译:温度对红泥浆中矿物的相变的影响:将赤铁矿降低到磁铁矿

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In this work a technological route was proposed to analyze the behavior of phase transformations of the minerals present in the red mud during the process of reduction of hematite to magnetite. The fluorescence analysis and X-ray diffraction showed that red mud presented approximately 5% titanium oxide as anatase and 28% iron oxide in the forms of hematite and goethite. Experiments involving the reduction of hematite to magnetite using thermal treatment. The material was calcined at temperatures of 500, 600 and 1000 degrees C for 2 h Then, X-ray diffraction and Raman spectroscopy analyzes were performed, which showed that the hematite was reduced to magnetite in all experimental conditions. For the calcination temperatures of 500 and 600 degrees C, the titanium oxide remained in anatase free form, but for the calcination performed at 1000 degrees C, the oxide passed into the form combined with iron (ilmenite). The route proposed in this work allowed to obtain a material with magnetic characteristics, which could be used as source of titanium after extraction of iron compounds by magnetic separation or acid leaching.
机译:在这项工作中,提出了一种技术途径,分析了在减少赤铁矿过程中红色泥浆中存在的矿物质的相变的行为。荧光分析和X射线衍射表明,红色泥浆以赤铁矿和甲酸酯的形式呈现为锐钛矿和28%氧化铁的5%氧化钛。涉及使用热处理将赤铁矿降低到磁铁矿的实验。在500,600和1000℃的温度下煅烧材料,然后进行X射线衍射和拉曼光谱分析,表明赤铁矿在所有实验条件下还原成磁铁矿。对于500和600℃的煅烧温度,氧化钛仍然是锐钛酶的自由形式,但是对于在1000℃下进行的煅烧,将氧化物进入与铁(Ilmenite)结合的形式。在该工作中提出的途径允许获得具有磁性特性的材料,其可在通过磁性分离或酸浸出萃取铁化合物后作为钛的来源。

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