Experimental Study on Suspension Magnetization Roasting-Magnetic Separation of an Iron Ore
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摘要:
某铁矿石铁品位是56.36%，主要以赤褐铁矿的形式存在，脉石矿物主要是石英和铝土矿。对该铁矿石采用了悬浮磁化焙烧—磁选工艺实验研究，在给料粒度为-0.074 mm 56.11%，焙烧温度为560℃，总气量为500 mL/min、CO浓度为30%，还原时间为15 min的条件下进行焙烧实验，然后将焙烧产品磨至-0.074 mm 95%，在磁场强度90 kA/m，选别时间5 min的条件下进行弱磁选实验，获得了铁品位64.42%，铁回收率94.49%的高品位铁精矿，为处理难选铁矿石提供了解决办法。
Abstract:The iron grade of a certain iron ore was 56.36%. The iron of raw ore mainly existed in the forms of hematite and limonite. The gangue minerals were chiefly quartz and bauxite. Therefore, a suspensionmagnetization roasting-magnetic separation process test was conducted on the ore. The results indicated that the optimum conditions for reducing roasting are as follows: The size of feed is -0.074 mm 56.11%, with roasting temperature 560℃, concentration of CO 30%, and roasting time 15 min. Under the optimum roasting conditions, the roasted products were ground to -0.074 mm 95%, and then magnetic separation was carried out to produce aniron concentrate with iron grade of 64.42% and iron recovery of 94.49%. It also provides a solution for other refractory iron ores.
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Key words:
- Iron ore /
- Suspension magnetization roasting /
- Magnetic separation /
- Hematite /
- Magnetite
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表 1 原矿的化学多元素分析/%
Table 1. Multi-element analysis of the raw ore
TFe FeO SiO2 Al2O3 MgO P S 烧失 56.36 1.13 3.38 7.00 0.68 0.082 0.047 8.59 
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表 2 铁物相分析结果
Table 2. Analysis results of irons phase
名称 磁性铁
中的铁碳酸铁
中的铁赤（褐、镜）
铁矿中的铁硫化铁
中的铁硅酸铁
中的铁总铁 含量/% 2.35 0.16 53.36 0.66 0.14 56.67 分布率/% 5.38 0.28 92.93 1.16 0.25 100.00
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表 3 焙烧产品化学多元素分析/%
Table 3. Multi-element analysis of the roasted ore
TFe FeO SiO2 Al2O3 MgO P S 58.16 25.29 3.70 7.69 0.18 0.082 0.093
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表 4 焙烧后铁物相分析
Table 4. Iron phase analysis after roasting
名称 磁性铁
中的铁碳酸铁
中的铁赤（褐、镜）
铁矿中的铁硫化铁
中的铁硅酸铁
中的铁总铁 含量/% 51.68 0.10 5.87 0.40 0.13 58.20 分布率/% 86.25 1.95 10.84 0.74 0.22 100.00
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表 5 磁选精矿产品化学多元素分析/%
Table 5. Multi-element analysis of magnetic separation concentrate
TFe FeO SiO2 Al2O3 MgO P S 64.54 22.29 1.64 5.65 0.26 0.10 0.037
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