Study on microwave-assisted grinding and liberation characteristics for Ludwigite

IF 0.9 4区工程技术 Q4 ENGINEERING, CHEMICAL Journal of Microwave Power and Electromagnetic Energy Pub Date : 2021-01-02 DOI:10.1080/08327823.2021.1877245

Wei-jun Huang, Yajing Liu

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引用次数: 3

Abstract

Abstract To effectively separate the valuable minerals in ludwigite, this study investigated the grinding fineness behaviour and liberation characteristics. The results indicated that the particle yield of −75 μm with a microwave power of 4 kW for 40 s was increased by 18.22% in comparison to that of raw ore. The D(50) and D(90) raw-ore grinding products reached 53.52 and 215.16 μm, both of which were larger than microwave-treated samples. The particle-size distribution of the grinding products for treated ore was more uniform, and the amount of coarse and over-ground particles decreased significantly. The specific surface area, pore volume and pore diameter of the large particles were effectively increased after microwave heating, which improved the crushing and grinding characteristics of the grinding products by lowering the relevant mechanical properties. The monomer liberations of magnetite, ascharite and serpentine of microwave-treated ore samples were 55.33%, 35.48% and 74.98%, respectively, which represented an increase of 12.06%, 9.37% and 6.22% in comparison to untreated ore samples. The bonding characteristics among different minerals were altered through microwave treatment to weaken the bonding force and reduce the proportion of interlocked minerals, which allows these complex minerals to easily liberate after secondary grinding.

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路德辉石微波辅助磨矿及解离特性研究

摘要:为有效分离路德辉石中有价矿物，研究了其磨矿细度行为及解离特性。结果表明:微波功率为4 kW、微波时间为40 s时，−75 μm的磨粒率比原矿提高了18.22%，D(50)和D(90)的磨粒率分别达到53.52和215.16 μm，均大于微波处理后的磨粒率;处理后的矿石磨矿产品粒度分布更加均匀，粗粒和浮粒数量明显减少。微波加热后，大颗粒的比表面积、孔体积和孔径均有效增加，通过降低磨矿产品的相关力学性能，改善了磨矿产品的破碎和研磨特性。微波处理的磁铁矿、石英石和蛇纹石单体解离率分别为55.33%、35.48%和74.98%，分别比未处理的矿石提高12.06%、9.37%和6.22%。微波处理改变了不同矿物之间的结合特性，使结合力减弱，降低了互锁矿物的比例，使这些复杂矿物在二次磨矿后容易解离。

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来源期刊

Journal of Microwave Power and Electromagnetic Energy ENGINEERING, CHEMICAL-ENGINEERING, ELECTRICAL & ELECTRONIC

CiteScore

2.50

自引率

6.70%

发文量

期刊介绍： The Journal of the Microwave Power Energy (JMPEE) is a quarterly publication of the International Microwave Power Institute (IMPI), aimed to be one of the primary sources of the most reliable information in the arts and sciences of microwave and RF technology. JMPEE provides space to engineers and researchers for presenting papers about non-communication applications of microwave and RF, mostly industrial, scientific, medical and instrumentation. Topics include, but are not limited to: applications in materials science and nanotechnology, characterization of biological tissues, food industry applications, green chemistry, health and therapeutic applications, microwave chemistry, microwave processing of materials, soil remediation, and waste processing.