赤铁矿
吸附
化学工程
化学
石英
粒子聚集
粒子(生态学)
Zeta电位
表面电荷
粒径
矿物学
材料科学
纳米颗粒
有机化学
地质学
复合材料
物理化学
工程类
海洋学
作者
Jarosław Drelich,Hedong Zhong,Wanzhong Yin,Chunbao Sun,Yang Hu
标识
DOI:10.1016/j.powtec.2021.08.032
摘要
In the flotation of finely disseminated iron ores, fine hematite and gangue minerals (mainly quartz) always co-exist in the pulp, their higher interface energies would cause complex interfacial interactions and aggregations. Thus, particle aggregation characteristics in hematite-quartz systems with sodium oleate (NaOL) were studied in this research. The focused beam reflectance measurement (FBRM) and Zeta potential distribution analyses revealed that quartz and hematite particles formed hetero-aggregates at pH 5.0–7.0, while NaOL would weaken the hetero-aggregation by inducing the aggregate formation of hematite particles. The adsorption and contact angle tests indicated that hetero-aggregation inhibition could be attributed to oleate ion (OL−) adsorption onto hematite surfaces, which changed the surface charge and hydrophobic characteristics. Theoretical calculations demonstrated that the hydrophobic interactions among hematite particles, rendered hydrophobic by NaOL, were the main cause of hematite particles forming large aggregates.
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