Enhancement of ilmenite magnetic properties by oxidation roasting and magnetic separation

Physicochemical Problems of Mineral Processing Pub Date : 2024-07-02 DOI:10.37190/ppmp/190706

Jiantao Gu, Zhitao Yuan, Yusheng Du, Wei Ji Lu, Chuan Yang, Hongyang Lv

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Abstract

Oxidation roasting was proposed to treat the problem of the weak magnetic properties of ilmenite. The effects of roasting temperature, roasting time and cooling method on the results of ilmenite magnetic separation were studied. At the same time, the mechanism of the oxidation roasting process was analyzed by XRD, VSM, SEM-EDS. Determine ilmenite suitable oxidation roasting conditions for roasting temperature 750 °C, roasting time of 20 min, and cooling method of air cooling; at this time, the yield of 96.79% can be achieved in the magnetic field intensity of 238.74 kA/m. The XRD results showed that phase changes in the roasting process occur in the order of ilmenite to hematite and rutile to pseudobrookite. The results of VSM showed that the maximum specific magnetization coefficient of ilmenite increased from 3.25×10-5 m3/kg to 5.58×10-5 m3/kg after roasting, and the magnetic property was enhanced. The results of SEM-EDS showed that the phase transition of ilmenite during the roasting process occurs in a spatial order from the edge of the particles to the interior.

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通过氧化焙烧和磁选提高钛铁矿的磁性能

针对钛铁矿磁性较弱的问题，提出了氧化焙烧法。研究了焙烧温度、焙烧时间和冷却方法对钛铁矿磁选结果的影响。同时，通过 XRD、VSM、SEM-EDS 分析了氧化焙烧过程的机理。确定钛铁矿合适的氧化焙烧条件为焙烧温度 750 ℃，焙烧时间 20 min，冷却方式为空冷；此时，在磁场强度为 238.74 kA/m 时，产率可达 96.79%。XRD 结果表明，焙烧过程中的相变顺序为钛铁矿到赤铁矿、金红石到假沸石。VSM 结果表明，焙烧后钛铁矿的最大比磁化系数从 3.25×10-5 m3/kg 增加到 5.58×10-5 m3/kg，磁性增强。SEM-EDS 的结果表明，钛铁矿在焙烧过程中的相变是按照从颗粒边缘到内部的空间顺序进行的。

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Physicochemical Problems of Mineral Processing

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