Minerals Engineering最新文献_第8页

Enhancement mechanism of metal ions on the flotation behavior of muscovite in sodium oleate system 金属离子对油酸钠体系中麝香石浮选行为的增强机制

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-01 DOI: 10.1016/j.mineng.2024.109035

Wenbao Liu , Tao Zheng , Yonglun Wang , Wengang Liu , Yanbai Shen , Shuling Gao , Qiang Zhao

Metal ions have been employed to improve the flotation efficiency of muscovite, yet the underlying enhancing mechanisms remain unclear. In this study, we systematically investigated the improvement in muscovite flotation by adding metal ions with different valence states (K⁺, Ca²⁺, and Al³⁺). Flotation experiments revealed that the muscovite recovery rate increased from approximately 10 % to over 70 % with the addition of Ca²⁺ and Al³⁺, while it decreased to less than 1 % with the introduction of K⁺. Fourier Transform Infrared spectrophotometer (FT-IR), contact angle tests, and zeta potential analysis confirmed the significant changes in the surface properties of muscovite after binding with K⁺, Ca²⁺, and Al³⁺. Surface electrostatic potential (ESP) results indicated that the muscovite surface exhibited positive electrostatic potential in the presence of these metal ions, facilitating the adsorption of collectors (NaOL) and enhancing the flotation recovery of muscovite. Furthermore, molecular dynamics (MD) simulations demonstrated that the enhancing effect of Al(OH)₂⁺ on collector adsorption was more pronounced than that of AlOH²⁺, attributed to the better dispersion of the OL-Al(OH)₂ complex compared to the 2OL-AlOH complex. These findings provide new insights into the complexation between metals and anionic collectors, and improving the flotation effect of minerals through metal ions has significant potential for industrial applications.

金属离子被用来提高麝香石的浮选效率，但其潜在的提高机制仍不清楚。在本研究中，我们系统地研究了添加不同价态的金属离子（K+、Ca2+ 和 Al3+）对麝香石浮选的改善作用。浮选实验表明，加入 Ca2+ 和 Al3+ 后，黝帘石的回收率从约 10% 提高到 70% 以上，而加入 K+ 后，回收率则下降到不足 1%。傅立叶变换红外分光光度计（FT-IR）、接触角测试和 zeta 电位分析证实，与 K+、Ca2+ 和 Al3+ 结合后，麝香石的表面性质发生了显著变化。表面静电电位（ESP）结果表明，在这些金属离子存在的情况下，麝香石表面表现出正的静电电位，有利于捕收剂（NaOL）的吸附，提高了麝香石的浮选回收率。此外，分子动力学（MD）模拟表明，Al(OH)2+ 对捕收剂吸附的促进作用比 AlOH2+ 更明显，这归因于 OL-Al(OH)2 复合物比 2OL-AlOH 复合物具有更好的分散性。这些发现为金属与阴离子捕收剂之间的络合提供了新的见解，通过金属离子改善矿物的浮选效果在工业应用中具有巨大潜力。

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引用次数: 0

HPAL of a lateritic nickel ore: An investigation on the relationship between nickel and cobalt extraction and acid consumption 红土镍矿的 HPAL：镍和钴的提取与酸消耗之间关系的研究

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-10-01 DOI: 10.1016/j.mineng.2024.109014

Büşra Çoban, Ahmet Deniz Baş

Nickel and cobalt raw materials have become essential in industries like batteries such as robotics, and drones, which are considered as future technologies due to their expanding applications and diversity. Research towards the development of environmentally friendly and relatively low-cost alternative methods for extracting nickel, particularly from low-grade deposits, is becoming increasingly crucial. Laterite ores processing is plagued by high reagent consumption and scale formation. This study focused on investigating the relationship between Ni and Co extraction and acid consumption in the high-pressure acid leaching of lateritic ore, as well as the characterization of leach residue. Analysis has shown that the lateritic ore contains 1.05 % Ni, 0.05 % Co and 21.94 % Fe. In the acid leaching tests based upon a Box-Behnken Design, the initial acid concentration and leach time have a beneficial effect on the Ni extraction (70–94 %). Cobalt extractions ranged between 93 % and 96 %. To facilitate Fe dissolution and increase Ni extraction, cuprous ions were added into the leach solution. Moderate level copper addition (0.025 M) resulted in a significant improvement in Ni extraction, whereas high levels of cuprous addition (0.050 M) did not have further benefit. It has been noted that adding cuprous ions significantly reduces the amount of scale that forms in the autoclave. The lowest Ni extraction was obtained under two different test conditions that did not include copper ions. Increased acid addition was correlated with the increase in Ni leaching and decreased Fe content in residue. There will exist an optimal situation where the acid addition is enough to enhance Ni dissolution and the Eh condition, leading to minimal dissolved Fe.

镍和钴原料已成为机器人和无人机等电池行业的必需品，由于其应用范围不断扩大，且具有多样性，这些行业被视为未来技术。研究开发环保且成本相对较低的镍提取替代方法，尤其是从低品位矿藏中提取镍的方法，正变得越来越重要。红土矿石加工过程中存在试剂消耗高和结垢的问题。本研究的重点是调查红土矿石高压酸浸出过程中镍和钴的提取与酸消耗之间的关系，以及浸出残渣的特征。分析表明，红土矿石中含有 1.05 % 的镍、0.05 % 的钴和 21.94 % 的铁。在基于 Box-Behnken 设计的酸浸出试验中，初始酸浓度和浸出时间对镍的提取率（70%-94%）产生了有利影响。钴的萃取率在 93% 到 96% 之间。为了促进铁的溶解并提高镍的萃取率，在浸出液中加入了亚铜离子。中度铜添加量（0.025 M）显著提高了镍的萃取率，而高浓度亚铜添加量（0.050 M）则没有进一步提高镍的萃取率。人们注意到，添加亚铜离子可显著减少高压釜中形成的水垢量。在不添加铜离子的两种不同试验条件下，镍的萃取率最低。酸添加量的增加与镍萃取量的增加和残渣中铁含量的降低有关。存在一种最佳情况，即酸的添加量足以提高镍的溶解和 Eh 条件，从而使溶解的铁最少。

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引用次数: 0

Surface modification of hemimorphite via ammonium chloride and its response to flotation 通过氯化铵对赤铁矿进行表面改性及其对浮选的响应

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-30 DOI: 10.1016/j.mineng.2024.109020

Huiqin Chen , Qi Zuo , Dandan Wu , Fan Wu , Ning Kong , Jing Cao

This paper focused on the catalytic sulfidation of hemimorphite to examine the promotional effect of NH₄Cl on surface sulfidation and its impact on the flotation performance. The interaction mechanism between NH₄Cl and the hemimorphite surface in the sulfidation flotation system was clarified. Micro-flotation tests were conducted using the sulfidation-xanthate flotation method. Compared with direct sulfidation, adding 2.5 × 10⁻⁴ M ammonium chloride to the flotation system increased the maximum flotation recovery of hemimorphite by about 18 %. AFM and SEM-EDS analysis revealed that NH₄Cl dissolved the hemimorphite surface and destroyed its structure. This exposed more Zn sites and enhanced the sulfidation of the hemimorphite surface. FTIR spectroscopy indicated that adding NH₄Cl promoted the adsorption of xanthate components on the hemimorphite surface, which formed more hydrophobic substances. XPS analysis of the hemimorphite surface suggested that NH₄Cl complexed with Zn species on the hemimorphite surface, which enhanced the reactivity of HS⁻ and S²⁻, thus improving the floatability. Further ToF-SIMS analysis confirmed that catalytic sulfidation produced a thicker and denser ZnS layer on the hemimorphite surface. Its surface activity was superior to that obtained by direct sulfidation, showing that NH₄Cl improved sulfidation flotation performance of hemimorphite. DFT results confirmed that catalytic sulfidation can occur spontaneously·NH₃ species separated from the hemimorphite surface and returned to the solution, and stable Zn-S covalent bonds were formed on the hemimorphite surface. These results provide a potential method for promoting the recovery of zinc oxide minerals.

本文以半透明石的催化硫化为研究对象，探讨了NH4Cl对表面硫化的促进作用及其对浮选性能的影响。阐明了硫化浮选体系中 NH4Cl 与赤铁矿表面的相互作用机理。采用硫化-黄药浮选法进行了微浮选试验。与直接硫化法相比，在浮选系统中添加 2.5 × 10-4 M 氯化铵可使半透明岩的最大浮选回收率提高约 18%。原子力显微镜（AFM）和扫描电子显微镜（SEM-EDS）分析表明，氯化铵溶解了半闪石表面并破坏了其结构。这暴露了更多的锌位点，增强了半闪石表面的硫化作用。傅立叶变换红外光谱分析表明，添加 NH4Cl 促进了半闪石表面对黄原酸盐成分的吸附，从而形成了更多的疏水性物质。对半透明石表面的 XPS 分析表明，NH4Cl 与半透明石表面的 Zn 物种络合，增强了 HS- 和 S2- 的反应活性，从而提高了可浮性。进一步的 ToF-SIMS 分析证实，催化硫化在半闪锌矿表面产生了更厚更致密的 ZnS 层。其表面活性优于直接硫化法，这表明 NH4Cl 提高了半闪石的硫化浮选性能。DFT 结果证实，催化硫化可自发发生--H3 物种从半晶石表面分离并返回溶液，在半晶石表面形成稳定的 Zn-S 共价键。这些结果为促进氧化锌矿物的回收提供了一种潜在的方法。

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引用次数: 0

The origin of interparticle aggregation: Probing the long-range hydrophobic forces between particles induced by nanobubbles in aqueous solutions 粒子间聚集的起源：探究水溶液中纳米气泡诱导的粒子间长程疏水作用力

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-30 DOI: 10.1016/j.mineng.2024.109030

Yunfan Wang , Wangqiang Jiang , Wenqing Qin , Zuchao Pan , Lufan Jia , Xin Hong , Zhenguo Song , Ximei Luo

The processes of particle–particle collision, adhesion, and detachment are omnipresent in the solid particle separation and purification processes. Nanobubbles, serving as a critical medium for interactions between particles, play a pivotal role in numerous fields of separation and purification such as mineral flotation, hydrometallurgy, chemical engineering, materials, and more. The elucidation of the principles governing nanobubbles’ involvement in interparticle interactions holds significant implications for enhancing and controlling separation and purification processes. The impact of nanobubbles on interparticle interactions between calcite particles was investigated in this study by measuring the forces between particles with and without nanobubbles and analysing them using DLVO and EDLVO theories. The experimental results demonstrate the occurrence of long-range attractive forces and significant adhesion between particles in the presence of nanobubbles under natural pH and ultrapure water conditions, phenomena that cannot be explained by classical DLVO theory. The generation of long-range hydrophobic attraction at the particle interface due to nanobubbles was confirmed through further EDLVO calculations and modifications, enhancing the stability of particle flocculation. Additionally, for the first time, the entire process from contact to detachment between the “particle-nanobubble” system in atomic force microscopy (AFM) simulations was described by combining experimental force curves with stepwise graphical interpretation. This approach provides valuable guidance for the analysis of bubble and soft matter interactions under AFM. The results of this study indicate that nanobubbles can indirectly alter the hydrophilicity and hydrophobicity of particles, increasing the probability of particle adhesion and reducing the probability of desorption, thereby enhancing the stability of particle flocculation.

在固体颗粒分离和提纯过程中，颗粒与颗粒之间的碰撞、粘附和分离过程无处不在。纳米气泡作为颗粒间相互作用的关键介质，在矿物浮选、湿法冶金、化学工程、材料等众多分离和提纯领域发挥着举足轻重的作用。阐明纳米气泡参与颗粒间相互作用的原理，对于加强和控制分离和提纯过程具有重要意义。本研究通过测量有纳米气泡和无纳米气泡颗粒之间的作用力，并利用 DLVO 和 EDLVO 理论进行分析，研究了纳米气泡对方解石颗粒间相互作用的影响。实验结果表明，在自然 pH 值和超纯水条件下，有纳米气泡存在时，颗粒之间会产生长程吸引力和显著的粘附力，而经典的 DLVO 理论无法解释这些现象。通过进一步的 EDLVO 计算和修正，证实了纳米气泡在颗粒界面上产生的长程疏水吸引力，从而增强了颗粒絮凝的稳定性。此外，原子力显微镜（AFM）模拟中的 "颗粒-纳米气泡 "系统从接触到脱离的整个过程，首次通过结合实验力曲线和分步图形解释进行了描述。这种方法为分析原子力显微镜下气泡与软物质的相互作用提供了宝贵的指导。研究结果表明，纳米气泡能间接改变颗粒的亲水性和疏水性，增加颗粒粘附的概率，降低颗粒解吸的概率，从而提高颗粒絮凝的稳定性。

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引用次数: 0

Evaluating CO2 sequestration through Technosol constructed from coal mining waste 评估利用采煤废料建造的 Technosol 进行二氧化碳封存的情况

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-30 DOI: 10.1016/j.mineng.2024.109032

Jessica Weiler , Colombo Celso Gaeta Tassinari

This paper proposes enhancing CO₂ sequestration and recovering degraded areas using Technosols constructed with coal waste and strategic materials. The evaluation of carbon capture considered four methods: (i) plant dry mass produced by Megathyrsus Maximus cv. Mombasa (ii) carbon incorporation via biochar, (iii) microbial biomass carbon, and (iv) mineral sequestration by lime. Local soil from the mine site was used as a control. Results show soil fertility parameters of the Technosols according to Brazilian guidelines. Plant growth increased with biochar incorporation but was still lower than in control soil. The pH, chemical, and mineralogical composition data were combined with geochemical reactions, showing the interaction of coal waste compounds, mainly pyrite with lime. Regarding calculating the CO₂ capture potential, biochar and mineral carbonation were the most relevant means for the designed system. The best performance obtained can capture approximately 65 t CO₂eq ha⁻¹, about four times greater than the systems traditionally used to recover waste disposal areas. The study demonstrates the feasibility of incorporating mining site recovery, waste disposal, and emissions mitigation in a closed system, providing sustainable options for the coal mining industry.

本文提出利用煤炭废料和战略材料构建的技术溶胶来加强二氧化碳封存和恢复退化地区。对碳捕集的评估考虑了四种方法：(i) 由 Megathyrsus Maximus cv. Mombasa 产生的植物干物质；(ii) 通过生物炭加入碳；(iii) 微生物生物质碳；(iv) 通过石灰进行矿物固碳。矿区的当地土壤被用作对照。结果显示，技术溶胶的土壤肥力参数符合巴西的指导方针。植物生长随着生物炭的加入而增加，但仍低于对照土壤。pH 值、化学成分和矿物成分数据与地球化学反应相结合，显示了煤炭废物化合物（主要是黄铁矿）与石灰的相互作用。在计算二氧化碳捕集潜力方面，生物炭和矿物碳化是与设计系统最相关的方法。获得的最佳性能可捕获约 65 吨二氧化碳当量公顷-1，比传统用于回收废物处理区的系统高出约四倍。该研究证明了将采矿场地回收、废物处置和排放减缓整合到一个封闭系统中的可行性，为煤炭开采业提供了可持续的选择。

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引用次数: 0

A mechanistic and data-driven approach for real-time online determination of ilmenite grade in pulp by X-ray fluorescence 利用 X 射线荧光实时在线测定纸浆中钛铁矿品位的机理和数据驱动方法

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-30 DOI: 10.1016/j.mineng.2024.109002

Lanhao Wang , Xiao Zhong , Hongyan Wang , Wei Dai

This article addresses the issues of low accuracy and time-consuming processes associated with traditional correction methods for matrix effect in the quantitative analysis of ilmenite grade by proposing a novel correction method based on a combination of mechanistic and data-driven approaches using X-ray fluorescence. By analyzing the modeling features of ilmenite grade, linear known terms and nonlinear unknown terms are identified. A comprehensive recognition of ilmenite grade is achieved by combining the least-squares method with a stochastic configuration network algorithm with block increments. Additionally, the Fisher information matrix is introduced to eliminate redundant nodes during the model establishment of block incremental, thereby reducing the network’s scale and achieving a lightweight model architecture. The practical industrial application demonstrates that the proposed method for estimating ilmenite grade achieves lower mean absolute error and root-mean-square error values, a coefficient of determination closer to 1, and a higher proportion of samples within an acceptable margin of error. These results are superior to other comparative algorithms, significantly enhancing the effectiveness of the ilmenite grade detection model.

本文针对钛铁矿品位定量分析中基体效应传统校正方法存在的精度低、过程耗时等问题，提出了一种基于机理和数据驱动相结合的 X 射线荧光校正新方法。通过分析钛铁矿品位的建模特征，确定了线性已知项和非线性未知项。通过将最小二乘法与分块增量随机配置网络算法相结合，实现了对钛铁矿品位的全面识别。此外，在分块递增的模型建立过程中，引入了费雪信息矩阵来消除冗余节点，从而减小了网络规模，实现了轻量级的模型架构。实际工业应用表明，所提出的钛铁矿品位估算方法获得了较低的平均绝对误差和均方根误差值，确定系数更接近于 1，并且在可接受误差范围内的样本比例更高。这些结果优于其他比较算法，大大提高了钛铁矿品位检测模型的有效性。

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引用次数: 0

Influence of clays on coal flotation: Focusing on coal surface oxidization 粘土对煤浮选的影响：关注煤的表面氧化

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-29 DOI: 10.1016/j.mineng.2024.109028

Yangchao Xia , Yaowen Xing , Xiahui Gui , Yijun Cao

This study is the first to investigate the influence of clays on the flotation of coals with different surface oxidization degrees. The results show that moderate oxidation is not conducive to coal flotation, regardless of the presence of clays. However, when the coal undergoes a high degree of oxidation, the presence of clay minerals has almost no influence on the coal flotation or is even beneficial when montmorillonite is present. This phenomenon is explainable, given that moderate oxidation is unfavorable for coal-bubble adhesion, whereas high oxidation is favorable from a single-bubble perspective when clays exist. Furthermore, atomic force microscopy tests show that a weak attraction force existed between unoxidized coal and clays, whereas a repulsive force always exists between highly oxidized coal and clays. These findings provide new enlightenment for oxidized coal flotation.

这项研究首次探讨了粘土对不同表面氧化程度煤炭浮选的影响。结果表明，无论是否存在粘土，中度氧化都不利于煤的浮选。然而，当煤炭发生高度氧化时，粘土矿物的存在对煤炭浮选几乎没有影响，甚至当存在蒙脱石时对煤炭浮选有利。这种现象是可以解释的，因为中度氧化不利于煤-气泡的粘附，而当存在粘土时，从单个气泡的角度来看，高度氧化是有利的。此外，原子力显微镜测试表明，未氧化的煤和粘土之间存在微弱的吸引力，而高度氧化的煤和粘土之间始终存在排斥力。这些发现为氧化煤的浮选提供了新的启示。

引用次数: 0

Electrochemical activation of periodate with graphite electrodes for degradation of high concentrations of thiocyanogen (SCN−) in mineral processing tail liquid 利用石墨电极对高碘酸盐进行电化学活化，以降解选矿尾液中的高浓度硫氰酸根 (SCN-)

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-29 DOI: 10.1016/j.mineng.2024.109009

Lucheng Zhang, Lu Wang, Mingqing Zhang, Tingting Wang, Gang Kang, Shilong Wu, Yi She

Cyanide has been widely used in gold extraction due to its cost-effectiveness, high selectivity and recovery. Regrettably, its wide application also leads to the presence of a large amount of thiocyanogen (SCN⁻) in the tail liquid of mineral processing plants, which affects the quality of the effluent water, and thus poses a threat to the ecological environment and human health. This paper investigates the degradation of high concentration of SCN⁻ in water using electrochemical oxidation/periodate (E-GP/PI) system. A degradation rate of 90.25 % of SCN⁻ was achieved by optimising various operating parameters. The effects of organic matter and typical heavy metal ion concentrations on the degradation of SCN⁻ were investigated, and it was found that Cu²⁺ was able to promote the degradation of SCN⁻ through the formation of stable complexes with SCN⁻, which enhanced the degradation rate to 96.48 %. However, the presence of Octadecyltrimethylammonium bromide (OTAB) and butylxanthin hindered the degradation process, where 500 mg/L of OTAB reduced the degradation rate of SCN⁻ to 80.88 %, while 100 mg/L of butylxanthin reduced the degradation rate to 78.66 %. On this basis, experiments were carried out using real wastewater samples and SCN⁻ degradation efficiencies of about 90 % were obtained. Afterwards, through electron paramagnetic resonance analysis, free radical burst, ion chromatograph and other research techniques, IO₃ and O₂^– were obtained as the main drivers of SCN⁻ degradation and SCN⁻ degradation pathways were elucidated. Finally, the E-GP/PI system was shown to be effective in reducing the ecotoxicity of SCN⁻ by increasing the 24-h LC₅₀ from 12.5 % to 48.5 % in a toxicity test with daphnia. This study provides a new idea for the green and efficient treatment of SCN⁻ rich beneficiation tail liquid.

氰化物因其成本效益高、选择性强和回收率高而被广泛用于黄金提取。遗憾的是，氰化物的广泛应用也导致选矿厂尾液中存在大量硫氰原（SCN-），影响出水水质，从而对生态环境和人类健康构成威胁。本文利用电化学氧化/过硫酸盐（E-GP/PI）系统研究了水中高浓度 SCN- 的降解问题。通过优化各种操作参数，SCN- 的降解率达到了 90.25%。研究了有机物和典型重金属离子浓度对 SCN- 降解的影响，发现 Cu2+ 能够通过与 SCN- 形成稳定的络合物促进 SCN- 的降解，从而将降解率提高到 96.48%。然而，十八烷基三甲基溴化铵（OTAB）和丁基黄质的存在阻碍了降解过程，其中 500 mg/L 的 OTAB 可将 SCN- 的降解率降至 80.88 %，而 100 mg/L 的丁基黄质可将降解率降至 78.66 %。在此基础上，利用实际废水样品进行了实验，结果表明 SCN- 的降解效率约为 90%。随后，通过电子顺磁共振分析、自由基猝灭、离子色谱等研究技术，得出了 IO3 和 O2- 是 SCN- 降解的主要驱动因子，并阐明了 SCN- 降解途径。最后，在水蚤毒性试验中，E-GP/PI 系统能有效降低 SCN- 的生态毒性，其 24 小时半数致死浓度从 12.5% 提高到 48.5%。这项研究为绿色高效处理富含 SCN- 的选矿尾液提供了新思路。

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引用次数: 0

The influence of NaCl on xanthate adsorption on chalcopyrite surface and chalcopyrite flotation 氯化钠对黄铜矿表面黄原酸盐吸附及黄铜矿浮选的影响

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-28 DOI: 10.1016/j.mineng.2024.109026

Minsu Hwang , Yufan Mu , Liang Cao , Yongjun Peng

Due to freshwater scarcity, mineral flotation plants have been using alternative water resources including seawater together with water recycling, resulting in the accumulation of salts in process water. However, how salts affect the adsorption of xanthates on the surfaces of sulphide minerals and subsequent sulphide mineral flotation is unclear. To address the knowledge gap, this study investigated how NaCl affected the adsorption of potassium amyl xanthate (PAX) on chalcopyrite surface and chalcopyrite flotation. Cyclic voltammetry (CV) tests identified that NaCl increased the oxidation of PAX and its adsorption on chalcopyrite surface due to elevated ionic strength and electrical conductivity of water, facilitating charge transfer among PAX, chalcopyrite surface and oxygen. NaCl also increased chalcopyrite surface oxidation to produce more CuS, facilitating the formation of copper-xanthate complexes. Flotation tests identified that the increased adsorption of PAX by NaCl was only translated into improved true flotation of chalcopyrite at a low PAX concentration such as 50 ppm in NaCl solutions with low and medium concentrations (0.1 and 0.7 M, respectively). At a high PAX concentration such as 150 ppm, the coexistence of high concentrations of PAX and NaCl led to strong froth destabilisation, resulting in a dramatic reduction in water recovery and true flotation recovery of chalcopyrite. The findings from this study will be able to guide the flotation plants to maximise mineral flotation by choosing collector dosage based on the ionic strength of process water.

由于淡水匮乏，矿物浮选厂一直在使用替代水资源，包括海水和循环水，从而导致工艺水中盐分的积累。然而，盐类如何影响硫化矿物表面对黄原酸盐的吸附以及随后的硫化矿物浮选还不清楚。为了填补这一知识空白，本研究调查了氯化钠如何影响黄铜矿表面对戊基黄原酸钾（PAX）的吸附以及黄铜矿的浮选。循环伏安法（CV）测试发现，由于水的离子强度和电导率升高，促进了 PAX、黄铜矿表面和氧气之间的电荷转移，NaCl 增加了 PAX 的氧化及其在黄铜矿表面的吸附。氯化钠还增加了黄铜矿表面的氧化作用，产生更多的CuS，促进了黄铜酸铜络合物的形成。浮选测试表明，只有在 PAX 浓度较低时，如在中低浓度（分别为 0.1 和 0.7 兆欧）的 NaCl 溶液中为 50 ppm 时，NaCl 对 PAX 的吸附才会转化为黄铜矿的真正浮选。在 PAX 浓度较高时（如 150 ppm），高浓度 PAX 和 NaCl 的共存会导致强烈的泡沫不稳定，从而导致黄铜矿的水回收率和真正浮选回收率急剧下降。这项研究的结果将能够指导浮选厂根据工艺水的离子强度选择捕收剂用量，从而最大限度地提高矿物浮选率。

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引用次数: 0

Mechanism of pyrite depression by marine Fe(II)-oxidizing bacteria in seawater flotation 海水浮选中海洋铁(II)氧化细菌抑制黄铁矿的机理

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering

Pub Date : 2024-09-28 DOI: 10.1016/j.mineng.2024.109029

Shigeshi Fuchida , Keishi Oyama , Jifeng Xue , Chiharu Tokoro , Yuma Shimizu , Hibiki Miura , Kokoro Kitagawa , Hiroko Makita

Seawater flotation is a promising technique to reduce environmental and economic loads in mineral processing. This study attempted to depress pyrite, a common gangue sulfide mineral, using two marine iron (Fe) oxidizing bacteria (MFeOB), Thalassospira sp. TF-1 and Mariprofundus sp. E-4, in seawater flotation without pH control; the MFeOB could contribute to hydrophilization of the pyrite surface by oxidation and/or adhesion of bacterial cells. Pyrite or chalcopyrite samples were preconditioned in seawater containing MFeOB for different times (15 min or 30 min). As a result of flotation experiments, the recovery of pyrite preconditioned without MFeOB (i.e., control sample) decreased to 64.2 % after 30 min reaction. The same recovery was observed when pyrite was preconditioned with Thalassospira sp. TF-1, whereas the recovery was successfully decreased to 20.2 % after preconditioning with Mariprofundus sp. E-4 for 30 min. X-ray photoelectron spectroscopy analysis of preconditioned pyrite samples showed no significant difference of Fe-oxidizing compounds between with and without MFeOB reaction, suggesting that the formation of hydrophilic substances such as Fe(OH)₃ derived from pyrite oxidation by MFeOB is unlikely to be the main reason for the pyrite depression by Mariprofundus sp. E-4. The adhesion experiment revealed that MFeOB cells could cover the pyrite surface but not the chalcopyrite surface, showing that the hydrophilicity of Mariprofundus sp. E-4 cell caused the pyrite depression. This result suggests that the hydrophilic/hydrophobic properties of bacterial cells are a significant determining factor in pyrite recovery in seawater flotation in the case of MFeOB.

海水浮选是一种很有前途的技术，可减少矿物加工过程中的环境和经济负担。本研究尝试使用两种海洋铁（Fe）氧化细菌（MFeOB）（Thalassospira sp. TF-1 和 Mariprofundus sp. E-4）在不控制 pH 值的海水浮选中抑制黄铁矿（一种常见的煤矸石硫化矿物）；MFeOB 可通过氧化和/或细菌细胞的粘附作用促进黄铁矿表面的亲水性。黄铁矿或黄铜矿样品在含有 MFeOB 的海水中进行了不同时间（15 分钟或 30 分钟）的预处理。浮选实验结果表明，不含 MFeOB 的黄铁矿预处理样品（即对照样品）的回收率在 30 分钟反应后降至 64.2%。用 Thalassospira sp. TF-1 对黄铁矿进行预处理时，也观察到了相同的回收率，而用 Mariprofundus sp. E-4 进行预处理 30 分钟后，回收率成功降至 20.2%。对预处理过的黄铁矿样品进行的 X 射线光电子能谱分析表明，有 MFeOB 反应和无 MFeOB 反应的黄铁矿样品中的铁氧化化合物没有明显差异，这表明 MFeOB 氧化黄铁矿形成的 Fe(OH)3 等亲水性物质不太可能是 Mariprofundus sp. E-4 抑制黄铁矿的主要原因。粘附实验表明，MFeOB 细胞能覆盖黄铁矿表面，但不能覆盖黄铜矿表面，这表明 Mariprofundus sp.这一结果表明，就 MFeOB 而言，细菌细胞的亲水/疏水特性是海水浮选中黄铁矿回收的重要决定因素。

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