Reinforcing grinding and separation efficiency of titanomagnetite via microwave radiation

Le résumé fourni par la source

The study investigated the effects of microwave irradiation pretreatment on titanomagnetite, a common but low-grade iron mineral in China. The impact of each microwave pretreatment parameter on crushing efficiency was assessed by analysing the crushing ratio. The Bond ball mill work index and separation efficiency of titanomagnetite were also examined before and after microwave treatment. The results showed that increasing microwave power resulted in a higher crushing ratio and finer particle size of the crushed products. Initially, the crushing ratio of the ore increased and then decreased with microwave heating time. The optimal crushing effect was observed at 4 kW microwave power with 150 s of heating time. Following microwave irradiation, the Bond ball mill work index of the ore decreased by 0.69 kW·h/t, indicating improved energy efficiency. Additionally, the particle size distribution of the ground products became more uniform, the ore particle surfaces became rougher, and there was a slight decrease in −0.075 mm particle size content, suggesting no overgrinding. The TFe recovery rate in iron concentrate remained stable after microwave treatment, while the TFe grade in iron concentrate increased by 1.27%, demonstrating that microwave-assisted grinding helps in enhancing the dissociation degree of titanomagnetite.

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