Selective flotation separation of molybdenite and talc by humic substances
Selective flotation separation of molybdenite and talc by humic substances
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DOI：
10.1016/j.mineng.2017.12.005
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发表时间：
2018-03
影响因子：
4.8
通讯作者：
Duowei Yuan;Lei Xie;Xingwei Shi;Longsheng Yi;Guofan Zhang;Hao Zhang;Qi Liu;Hongbo Zeng
中科院分区：
文献类型：
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作者：
Duowei Yuan;Lei Xie;Xingwei Shi;Longsheng Yi;Guofan Zhang;Hao Zhang;Qi Liu;Hongbo Zeng
本文研究了腐植酸（HA）作为一种潜在的选择性捕收剂，在滑石与滑石的浮选分离中对滑石的捕收作用。在单矿物浮选试验中，HA在pH 3-11的整个pH范围内对菱沸石都表现出良好的抑制能力，而滑石的可浮性仅在强酸性条件下（pH 3）受HA的影响。在混合矿物浮选中，在强碱性条件下（pH 11），HA能有效抑制镁橄榄石的浮选，而不影响滑石的浮选。接触角测试结果表明，经HA处理后，滑石和水滑石的疏水性均有所下降，但处理后的滑石的接触角仍高于水滑石。平衡吸附研究表明，HA具有更高的吸附密度在镁橄榄石上比在滑石。通过漫反射红外光谱（DRIFTS）和原子力显微镜（AFM）成像，进一步证实了羟基磷灰石的优先吸附。实验结果表明，在碱性条件下，腐殖酸可作为白云母和滑石的选择性吸附剂，其在白云母上的吸附密度高于滑石，是白云母和滑石选择性分离的主要原因。
Humic acid (HA) has been studied as a potential selective depressant for molybdenite in the flotation separation of molybdenite and talc in this paper. In the single mineral flotation tests, HA has shown good depression ability to molybdenite over the entire pH range tested from pH 3–11, while the floatability of talc was only affected by HA under strong acidic condition (pH 3). In the mixed minerals flotation, HA can effectively depress the flotation of molybdenite while not affecting the flotation of talc under strong alkaline condition (pH 11). Contact angle measurements have proved that the hydrophobicity of both talc and molybdenite decreases after treatment by HA, however, the contact angles of treated talc are still higher than molybdenite. Equilibrium adsorption studies indicate that HA has a much higher adsorption density on molybdenite than on talc. The preferential adsorption of HA on molybdenite was further confirmed by diffusion reflectance infrared Fourier transform spectroscopy (DRIFTS) and atomic force microscopy (AFM) imaging. All of the experimental results suggest that humic acids can be employed as a selective depressant for molybdenite during the flotation separation of molybdenite and talc under alkaline conditions, and the higher adsorption density of HA on molybdenite over talc is the primary reason for the selective separation.