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Interaction Behavior between Coarse and Fine Particles in the Reverse Flotation of Fluorapatite and Dolomite
Langmuir ( IF 3.7 ) Pub Date : 2023-08-30 , DOI: 10.1021/acs.langmuir.3c02117
Xiaofen Huang 1, 2, 3, 4 , Qin Zhang 2, 3, 4, 5
Langmuir ( IF 3.7 ) Pub Date : 2023-08-30 , DOI: 10.1021/acs.langmuir.3c02117
Xiaofen Huang 1, 2, 3, 4 , Qin Zhang 2, 3, 4, 5
Affiliation
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The precondition for efficient flotation of middle- to low-grade phosphate ore is the dissociation of apatite from gangue minerals through fine grinding. However, fine gangue minerals, such as dolomite, have a lower hardness and are thus easily overground and converted into slime during the grinding stage. The effect of −10 μm dolomite fines (Dol–10μm) on the flotation of −75 + 25 μm dolomite (Dol–75+25μm) and −75 + 25 μm fluorapatite (FAp–75+25μm) from a detailed mechanism was investigated by microflotation tests, cryo-electron microscopy analysis, contact angle measurements, bubble-particle attachment test, and EDLVO theory. It was found that Dol–10μm significantly reduced the recovery of Dol–75+25μm and FAp–75+25μm. The Dol–10μm particles could decrease the flotation recovery of Dol–75+25μm particles by masking on their surfaces, thus reducing the hydrophobicity of mineral surfaces and preventing them from floating. Furthermore, Dol–10μm particles were easily adsorbed on the FAp–75+25μm surface and could not be effectively floated, which results in fine dolomite being mixed into the concentrate at the bottom of the tank, thereby reducing the selectivity of reverse flotation for phosphate ore. The interaction energy calculation showed that the presence of NaOL led to an attractive interaction force between Dol–10μm and Dol–75+25μm, as well as between Dol–10μm and FAp–75+25μm. As a result, Dol–10μm particles presented a nonselective aggregation with Dol–75+25μm and FAp–75+25μm particles, explaining the phenomenon of “slime coating” and the depressing effect of dolomite fines on phosphate reverse flotation.
中文翻译：
氟磷灰石与白云石反浮选中粗粒与细粒的相互作用行为
中低品位磷矿石高效浮选的前提是通过细磨将磷灰石从脉石矿物中解离出来。然而，细粒脉石矿物（例如白云石）的硬度较低，因此在研磨阶段很容易被过度研磨并转化为矿泥。从详细机制研究了−10 μm白云石粉（Dol –10μm ）对−75 + 25 μm白云石（Dol –75+25μm）和−75 + 25 μm氟磷灰石（FAp –75+25μm）浮选的影响通过微浮选测试、冷冻电子显微镜分析、接触角测量、气泡-颗粒附着测试和 EDLVO 理论。结果发现，Dol –10μm显着降低了 Dol –75+25μm和 FAp –75+25μm的回收率。Dol –10μm颗粒通过掩蔽其表面，降低Dol –75+25μm颗粒的浮选回收率，从而降低矿物表面的疏水性，防止其上浮。此外，Dol –10μm颗粒容易吸附在FAp –75+25μm表面，无法有效浮选，导致细白云石混入槽底精矿中，降低了反浮选磷酸盐的选择性矿石。相互作用能计算表明，NaOL的存在导致Dol –10μm和Dol –75+25μm之间以及Dol –10μm和FAp –75+25μm之间产生吸引力相互作用力。结果，Dol –10μm颗粒与Dol –75+25μm和FAp –75+25μm颗粒呈现非选择性聚集，解释了“粘泥包覆”现象以及白云石粉对磷酸盐反浮选的抑制作用。
更新日期：2023-08-30
中文翻译：
氟磷灰石与白云石反浮选中粗粒与细粒的相互作用行为
中低品位磷矿石高效浮选的前提是通过细磨将磷灰石从脉石矿物中解离出来。然而，细粒脉石矿物（例如白云石）的硬度较低，因此在研磨阶段很容易被过度研磨并转化为矿泥。从详细机制研究了−10 μm白云石粉（Dol –10μm ）对−75 + 25 μm白云石（Dol –75+25μm）和−75 + 25 μm氟磷灰石（FAp –75+25μm）浮选的影响通过微浮选测试、冷冻电子显微镜分析、接触角测量、气泡-颗粒附着测试和 EDLVO 理论。结果发现，Dol –10μm显着降低了 Dol –75+25μm和 FAp –75+25μm的回收率。Dol –10μm颗粒通过掩蔽其表面，降低Dol –75+25μm颗粒的浮选回收率，从而降低矿物表面的疏水性，防止其上浮。此外，Dol –10μm颗粒容易吸附在FAp –75+25μm表面，无法有效浮选，导致细白云石混入槽底精矿中，降低了反浮选磷酸盐的选择性矿石。相互作用能计算表明，NaOL的存在导致Dol –10μm和Dol –75+25μm之间以及Dol –10μm和FAp –75+25μm之间产生吸引力相互作用力。结果，Dol –10μm颗粒与Dol –75+25μm和FAp –75+25μm颗粒呈现非选择性聚集，解释了“粘泥包覆”现象以及白云石粉对磷酸盐反浮选的抑制作用。
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