通过流变学研究油酸诱导的磷灰石细粒疏水聚结

IF 4.9 2区 工程技术 Q1 ENGINEERING, CHEMICAL Minerals Engineering Pub Date : 2024-09-24 DOI:10.1016/j.mineng.2024.108911
Lina Zhao , Qin Zhang
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引用次数: 0

摘要

磷矿石中的有用矿物磷灰石具有细小的嵌布粒度,需要细磨才能进行单体解离,这会导致大量细磷灰石生成,造成浮选效率低等问题。本研究探讨了 pH 值、药剂浓度和搅拌速率对细粒磷灰石团聚行为和流变特性的影响。通过傅立叶变换红外光谱(FTIR)、X 射线光电子能谱(XPS)和 zeta 电位分析,提出了合理的团聚机制。此外,还利用流变参数表观粘度评估了颗粒之间的相互作用,揭示了细磷灰石团聚与纸浆流变之间的内在联系。结果表明,在油酸(OA)浓度为 400 mg/L、搅拌速率为 500 rpm、pH 值为 9 的条件下,磷灰石的平均粒径(dmean)从原来的 7.37 μm 增加到 104.7 μm,表观粘度从 2.18 mPa-s 上升到 17.40 mPa-s。在细磷灰石团聚过程中,OA 通过化学络合作用吸附在磷灰石颗粒表面,使磷灰石表面疏水,从而使磷灰石颗粒之间因疏水吸引力而团聚。此外,还提出了磷灰石在团聚前后的浮选模型,颗粒团聚、表观粘度和颗粒相互作用之间存在相关性,形成类似 "铁三角 "的三角关系。该研究为细小颗粒疏水团聚的调控提供了新的见解。
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Study of oleic acid-induced hydrophobic agglomeration of apatite fines through rheology
The useful mineral apatite in phosphate ore has a fine embedded particle size, requiring fine grinding for monomer dissociation, which will lead to a large number of fine apatite generation, resulting in low flotation efficiency and other problems. In this study, the effects of pH, agent concentration and stirring rate upon agglomeration behavior and rheological properties of fine apatite were investigated. The reasonable agglomeration mechanisms were proposed by means of Fourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), zeta potential analysis. Moreover, the interaction between particles was evaluated by using the rheological parameter apparent viscosity, and the internal connection between fine apatite agglomeration and pulp rheology was revealed. The results indicate that at an oleic acid (OA) concentration of 400 mg/L, stirring rate of 500 rpm, and pH of 9, the average particle size (dmean) of apatite increases from the original 7.37 μm to 104.7 μm, and the apparent viscosity rises from 2.18 mPa·s to 17.40 mPa·s. In the process of fine apatite agglomeration, OA is adsorbed onto the surface of apatite particles through chemical complexation, which makes the apatite surface hydrophobic, and thus causing agglomeration between apatite particles due to hydrophobic attraction. In addition, the flotation models of apatite were proposed before and after agglomeration, and there is a correlation among particle agglomeration, apparent viscosity and particle interactions, forming a triangular relationship similar to an “iron triangle”. This study provides novel insights into the regulation of hydrophobic agglomeration of fine particles.
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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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