Amine-coated nanobubbles-assisted flotation of fine and coarse quartz

IF 4.9 2区 工程技术 Q1 ENGINEERING, CHEMICAL Minerals Engineering Pub Date : 2024-09-14 DOI:10.1016/j.mineng.2024.108983
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Abstract

This study investigates the role of alkyl ether monoamine-coated nanobubbles (NBs) in assisting the flotation process of quartz across various particle sizes, on a bench scale. Experiments were conducted in a mini lab column utilizing a consortium of bubble sizes: D32 = 1200 μm for macrobubbles and D32 = 180–220 nm for amine-coated NBs. The study revealed that an increase in amine-coated NBs correlates well with a decrease in the air/solution’s interfacial tension caused by the ether amine at less than 68 mN m−1. True flotation recoveries with varying amine/g quartz, where the collector-frother amine may be amine-coated NBs alone or assisted by NBs generated in pure water, were compared with blank tests, in the absence of NBs. The flotation study evaluated size-to-size fractions from fine (−20 µm) to coarse (up to 150 µm) particles and their mixtures. In addition, the work extended to explore the behavior of the “super” coarse quartz from 150 µm up to 1000 µm. The results highlighted a clear dependence on the particle size, with NBs improving recoveries in all fractions, especially the difficult-to-treat ultrafine/fine and coarse quartz. Recovery results exceeded 90 % in all fractions (isolated or in mixtures) at a high rate with the amine-coated NBs. The mechanisms proposed improved flotation performance attributed to the high numerical concentrations of NBs (at least 2–3 × 1010 NBs per gram of quartz) rapidly attaching to quartz surfaces, serving as “seeds” for the adhesion of larger bubbles generated in conventional flotation cells. This interaction facilitates the formation of lightweight, cluster-like aggregates that swiftly rise to the column’s surface. Notably, larger quartz particles (+355 µm) form the bigger hydrophobic and buoyant clusters, leading to their rapid levitation and effective phase separation, with over 95 % separation efficiency. This innovative technique’s significance, outcomes, and potential scalability are thoroughly discussed, highlighting its promising applicability in diverse mineral and ore flotation systems, particularly those containing quartz and silicates.

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胺包覆纳米气泡辅助浮选细粒和粗粒石英
本研究调查了烷基醚单胺包裹的纳米气泡(NBs)在辅助不同粒度石英浮选过程中的作用。实验在微型实验柱中进行,使用了各种尺寸的气泡:大气泡的 D32 = 1200 μm,胺涂层 NB 的 D32 = 180-220 nm。研究表明,胺包覆 NB 的增加与醚胺导致的空气/溶液界面张力的降低(小于 68 mN m-1)密切相关。将不同胺/克石英的真实浮选回收率与不含 NB 的空白试验进行了比较,其中捕收剂-醚胺可能是单独的胺包覆 NB,也可能由纯水中生成的 NB 辅助。浮选研究评估了从细(-20 微米)到粗(达 150 微米)颗粒及其混合物的粒度-粒度馏分。此外,这项工作还扩展到探索从 150 微米到 1000 微米的 "超 "粗石英的行为。结果表明,NBs 对粒度有明显的依赖性,它可以提高所有馏分的回收率,尤其是难以处理的超细/微细石英和粗石英。胺涂层 NB 在所有馏分(单独或混合物)中的回收率均超过 90%。所提出的改进浮选性能的机理归因于高数值浓度的 NBs(每克石英中至少有 2-3 × 1010 个 NBs)迅速附着在石英表面,成为传统浮选槽中产生的较大气泡附着的 "种子"。这种相互作用促进了轻质团状聚集体的形成,并迅速上升到柱体表面。值得注意的是,较大的石英颗粒(+355 微米)形成了较大的疏水性和浮力团块,使其迅速悬浮并有效地进行相分离,分离效率超过 95%。本文对这一创新技术的意义、成果和潜在的可扩展性进行了深入讨论,强调了它在各种矿物和矿石浮选系统中的应用前景,尤其是那些含有石英和硅酸盐的浮选系统。
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来源期刊
Minerals Engineering
Minerals Engineering 工程技术-工程:化工
CiteScore
8.70
自引率
18.80%
发文量
519
审稿时长
81 days
期刊介绍: The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.
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