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Gravity-based pre-concentration strategies for complex rare earth ore containing niobium and zirconium 基于重力的含铌和锆复杂稀土矿预选策略
Pub Date : 2024-02-02 DOI: 10.37190/ppmp/183609
Mingliang Zhou, Lixia Li, Feifei Liu, Zhichao Liu, Naci Emre Altun, Zhi-tao Yuan, Jiongtian Liu
The Balzhe rare earth mine, renowned for its rich reservoirs of niobium, zirconium, and rare earth elements, poses a unique challenge due to its diverse and interbedded mineral composition. Despite the abundance of these elements, their valuable grade remains notably low, falling short of economic thresholds. To this end, pre-concentration of valuable minerals to discard gangue minerals before flotation would be an economical option. In response, this study delves into the feasibility of gravity-induced pre-concentration, aiming to segregate valuable minerals from gangue for subsequent flotation processes. Conducting float-and-sink tests on varied particle sizes (-2+0.5 mm, -0.5+0.074 mm, and -0.074+0.02 mm) within heavy liquids of specific gravities (ranging from 2.55 to 2.85), the study reveals the effectiveness of gravity separation. Notably, particles sized -2+0.5 mm and -0.074+0.02 mm demonstrated superior separation performance over the -0.5+0.074 mm fraction. Comparative analysis of diverse gravity separation equipment unveiled compelling results. The dense medium cyclone separator showcased impressive recovery rates and high-grade concentrates of Nb2O5, ZrO2, and total rare earth oxides (TREO) at 0.34%, 8.20%, and 0.41%, respectively, surpassing the sand table's performance for -2+0.5 mm particles. Conversely, for -0.5+0.074 mm particles, the shaking table exhibited optimal separation efficiency, yielding grades of Nb2O5, ZrO2, and TREO at 0.37%, 4.08%, and 0.44%, with substantial recovery values. Ultimately, the Knelson centrifugal separator proved most effective for -0.074+0.02 mm particles, yielding notable grades and recoveries of Nb2O5, ZrO2, and TREO. This study underscores the promising potential of gravity-induced pre-concentration techniques for enhancing the recovery of valuable elements from the complex Balzhe rare earth ore, offering critical insights into optimizing mineral extraction processes.
巴尔泽稀土矿以其丰富的铌、锆和稀土元素储藏而闻名于世,由于其矿物成分多样且相互交错,该矿面临着独特的挑战。尽管这些元素储量丰富,但其有价值的品位仍然很低,达不到经济阈值。为此,在浮选前对有价值矿物进行预选以剔除矸石矿物将是一种经济的选择。为此,本研究深入探讨了重力诱导预富集的可行性,旨在将有价矿物从矸石中分离出来,以用于后续的浮选工艺。在比重为 2.55 至 2.85 的重液中,对不同粒度(-2+0.5 毫米、-0.5+0.074 毫米和-0.074+0.02 毫米)的颗粒进行浮沉试验,研究揭示了重力分离的有效性。值得注意的是,粒度为-2+0.5 毫米和-0.074+0.02 毫米的颗粒比-0.5+0.074 毫米的颗粒具有更好的分离性能。对各种重力分离设备的比较分析得出了令人信服的结果。致密介质旋风分离器的回收率和高品位 Nb2O5、ZrO2 和总稀土氧化物 (TREO) 精矿的回收率令人印象深刻,分别为 0.34%、8.20% 和 0.41%,超过了 -2+0.5 毫米颗粒的砂台性能。相反,对于 -0.5+0.074 毫米的颗粒,振动台表现出最佳的分离效率,得到的 Nb2O5、ZrO2 和 TREO 品位分别为 0.37%、4.08% 和 0.44%,回收率非常高。最终,Knelson 离心分离器被证明对 -0.074+0.02 毫米的颗粒最为有效,可获得显著的 Nb2O5、ZrO2 和 TREO 品位和回收率。这项研究强调了重力诱导预富集技术在提高复杂的巴尔泽稀土矿中有价值元素回收率方面的巨大潜力,为优化矿物提取工艺提供了重要启示。
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引用次数: 0
Current status of research on nanobubbles in particle flotation 颗粒浮选中的纳米气泡研究现状
Pub Date : 2024-02-02 DOI: 10.37190/ppmp/183613
Jian Chen, Jun Chen, Yali Cheng
Froth flotation, as one of the most widely used separation approaches in mineral processing, is commonly used to recover valuable components from minerals. However, maintaining high flotation efficiencies is a serious challenge for conventional froth flotation in the face of decreasing particle size of the minerals to be sorted. To date, there have been plenty of reports on the software of nano-bubbles (NBS) in flotation, and the experimental consequences show that nano-bubbles' introduction has given rise to improvement's different grades in the recovery of varieties of minerals, which highlights the great potential of nano-bubbles for mineral flotation. Nanobubbles have smaller bubble radii and unusually high stability compared to conventional flotation bubbles, and their related behavior in flotation has been a hot research topic. This paper reviews some of the methods of preparing nanobubbles, equipment techniques for characterizing nanobubbles, factors affecting their stability, and some of the popular doctrines. In particular, the reinforcing mechanism of nanobubbles in the particle flotation process is discussed, first, the nanobubbles improve the electrostatic attractiveness with the particles by achieving the charge inversion while the nanobubbles that was adsorbed on the particles' surface will cover a share of the charge, which decreases the electrostatic repulsive force between the particles; and second, the nanobubbles can act as a bridge between the surfaces of the two particles, which advances the agglomeration between the particles. This review aims to be able to further advance the research related to the industrialization of nanobubbles.
浮选是矿物加工中应用最广泛的分离方法之一,通常用于从矿物中回收有价值的成分。然而,面对待选矿物粒度的不断减小,保持高浮选效率是传统泡沫浮选法面临的严峻挑战。迄今为止,已有大量关于纳米气泡(NBS)在浮选中的应用的报道,实验结果表明,纳米气泡的引入使各种矿物的回收率得到了不同程度的提高,凸显了纳米气泡在矿物浮选中的巨大潜力。与传统浮选气泡相比,纳米气泡具有更小的气泡半径和异常高的稳定性,其在浮选中的相关行为一直是研究的热点。本文综述了纳米气泡的一些制备方法、表征纳米气泡的设备技术、影响纳米气泡稳定性的因素以及一些流行的学说。其中特别讨论了纳米气泡在颗粒浮选过程中的强化机理:首先,纳米气泡通过实现电荷反转来提高与颗粒的静电吸引力,同时吸附在颗粒表面的纳米气泡会覆盖一部分电荷,从而减小颗粒间的静电排斥力;其次,纳米气泡可以作为两个颗粒表面之间的桥梁,促进颗粒间的团聚。本综述旨在进一步推动与纳米气泡产业化相关的研究。
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Physicochemical Problems of Mineral Processing
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