The influence of hydrochloric acid corrosion pretreatment on the flotation performance of hematite and its surface acid corrosion mechanism

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2024-06-11 DOI:10.1016/j.apt.2024.104515

Yu Xie , Xiaoqi Ban , Wanzhong Yin , Jin Yao

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Abstract

This study systematically investigated the impact of Hydrochloric acid (HCl) corrosion pretreatment on hematite flotation within the NaOL system, analyzing the influence of varying HCl concentrations (measured as pH) on hematite acid corrosion. The results showed that at pH = 1, after 4 min of acid corrosion, hematite exhibited optimal floatability, achieving a recovery rate of 82.49 %, significantly surpassing the original ore. Conversely, at pH = 5, after the same duration of acid corrosion, hematite’s flotation is inhibited, yielding a recovery rate of 59.38 %, lower than the original ore. Through contact angle, adsorption amount measurements, and AFM detection, it is observed that after corrosion in pH = 1 HCl solution, hematite surface roughness increases, more NaOL collector is adsorbed, leading to significant hydrophobicity enhancement. After corrosion in pH 5 weak acid environment, despite increased surface roughness, hematite surface was coated with particulate matter, greatly reducing NaOL adsorption and further decreasing hydrophobicity. Further analysis using FTIR, XPS, and hydrolysis component calculation indicated that after acid corrosion in HCl at pH = 1, hematite exposed more active Fe sites, enhancing flotation performance. Conversely, at pH = 5, surface-dissolved Fe³⁺ transformed into hydrophilic Fe(OH)₃, inhibiting flotation by covering the hematite surface.

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盐酸腐蚀预处理对赤铁矿浮选性能的影响及其表面酸腐蚀机理

本研究系统研究了盐酸（HCl）腐蚀预处理对 NaOL 系统中赤铁矿浮选的影响，分析了不同盐酸浓度（以 pH 值计）对赤铁矿酸腐蚀的影响。结果表明，在 pH = 1 的条件下，经过 4 分钟的酸腐蚀后，赤铁矿表现出最佳的可浮性，回收率达到 82.49%，大大超过了原矿的回收率。相反，在 pH = 5 条件下，经过相同时间的酸腐蚀，赤铁矿的浮选受到抑制，回收率为 59.38%，低于原矿。通过接触角、吸附量测量和原子力显微镜检测观察到，在 pH = 1 的盐酸溶液中腐蚀后，赤铁矿表面粗糙度增加，吸附了更多的 NaOL 捕收剂，导致疏水性显著增强。在 pH 值为 5 的弱酸环境中腐蚀后，尽管表面粗糙度增加，但赤铁矿表面被颗粒物质包裹，大大减少了对 NaOL 的吸附，进一步降低了疏水性。利用傅立叶变换红外光谱、XPS 和水解成分计算方法进行的进一步分析表明，在 pH = 1 的盐酸中受到酸腐蚀后，赤铁矿暴露出更多的活性铁位点，从而提高了浮选性能。相反，在 pH = 5 时，表面溶解的 Fe3+ 转化为亲水性的 Fe(OH)3，覆盖在赤铁矿表面，从而抑制了浮选。

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来源期刊

Advanced Powder Technology 工程技术-工程：化工

CiteScore

9.50

自引率

7.70%

发文量

424

审稿时长

55 days

期刊介绍： The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)