Particle size and wettability effect of ultrafine magnetite concentrate on ballability
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摘要: 以產自澳洲Pilbara礦區和國內東北地區的兩種磁鐵精礦作為研究對象,基于Washburn公式所構建的臥式薄板毛細滲透裝置,針對粒度特性研究其潤濕性對成球性能的影響,并輔以成球性能、造球試驗和生球性能檢測等一系列的研究,探究鐵精礦超微細粒度特性和潤濕性對其成球性能的交互影響.結果表明:超微細的粒度特性和潤濕性對成球性能產生了較大影響.微細的粒度特性帶來的較好的潤濕性對提高生球的抗壓強度有利.然而,超微細粒度和較窄的粒級分布不利于生球內形成較合理的毛細管半徑,進而限制其熱穩定性的提高.Abstract: Two kinds of magnetite concentrates from Pilbara in Australia and an area in the northeast in China were used to explore the effect of wettability, which depends on particle size, on ballability. Capillary osmosis equipment of a horizontal plate was constructed based on the equation Washburn. To investigate the effect of particle size and wettability of ultrafine magnetite concentrates on ballability, ballability, balling test, and performance test were performed. The results suggest that ultrafine particle size and wettability strongly affect ballability. Its better wettability on account of particle ultrafine size characteristic is beneficial to improve its compressive strength. However, a narrow ultrafine particle-size distribution will limit the improvements in ballability, because it affects the capillary radius.
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Key words:
- pellet /
- ultrafine particle size /
- wettability /
- ballability /
- capillary radius
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參考文獻
[9] Yang C C, Zhu D Q, Pan J, et al. Oxidation and induration characteristics of pellets made from Western Australian ultrafine magnetite concentrates and Its utilization strategy. J Iron Steel Rsearch Int, 2016, 23(9):924 [14] Washburn E W. The dynamics of capillary flow. Phys Rev, 1921, 17(3):273 [16] Iveson S M, Holt S, Biggs S. Contact angle measurements of iron ore powders. Colloids Surf A, 2000, 166(1):203 -
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