CHEMOSPHERE
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2021
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IF 7.086
Xin Lv,Hongbo Zhao,Yisheng Zhang,Zefan Yan,Yu Zhao,Hong Zheng,Wenqing Liu,Jianping Xie,Guanzhou Qiu
Although pyrite bio-dissolution plays an important role in the processing of sulfide ores, the formation of passivation film inhibited the further dissolution of sulfide ores. In order to enhance the dissolution of sulfide ores, a novel method for destroying the passivation film using ozone was proposed and verified. The generated passivation film inhibiting pyrite dissolution in the presence of Leptospirillum ferrooxidans and Acidithiobacillus thiooxidans was studied. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results indicate that a passivation film mainly consisting of jarosite and polysulfide (S n n− /S 0 ) might be formed during biotic stage, which can be eliminated with the introduction of ozone (2 g/min) in 30 min. Electrochemical results show that ozone significantly increased the electrochemical reactivity of passivated pyrite, further proving that ozone enhanced the dissolution of passivated pyrite through destroying the passivation layer. Hence, a bi-stage method for dissolution of sulfide ores can be proposed.
研究领域:
微生物学
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矿物加工工程
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DOI
PubMed
高影响因子
Geochemistry
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2021
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IF 2.292
Qian Wei,Liuyang Dong,Wenqing Qin,Fen Jiao,Zhongxu Qi,Cheng Feng,Dayong Sun,Long Wang,Shunyuan Xiao
In this study, a new flotation approach, a low-alkaline and non-desliming process, was introduced for improving lead and zinc recoveries, lowering production cost and reducing environmental pollution . Lab-scale experiments results show that the new process contributed to the flotation of the complex mixed sulfide-oxide lead and zinc ore regarding two aspects: (1) High alkaline process (pH = 12±) was replaced by low alkaline process (pH = 9±) by using collector WS (a mixture of ethyl thiocarbamate, ammonium dibutyldithiophosphate and dithiophosphate-25) and combined depressant Na 2 S/ZnSO 4 /Na 2 SO 3 for lead sulfide flotation; (2) Non-desliming process was successfully achieved by using collector MA (a mixture of ether amine, hydroxyethyl cellulose and polyacrylic acid) and combined depressant SHP/SS (sodium hexametaphosphate/sodium silicate) for zinc oxide flotation. And 43.37% Pb in the Pb concentrate was recovered, the corresponding Pb grade was 52.73%, total 84.42% Zn was recovered by the flotation of zinc sulfide minerals and zinc oxide minerals . Moreover, the two aspects of the new approach were systematically verified from lab-scale to industrial-scale application. The industrial-scale flotation tests show that Pb recovery in Pb concentrate increased by 1.86% compared with that of original system during industrial-scale tests period, and the Pb recovery increased by 4.09% compared with that of original system before industrial-scale tests period, while the Zn operating recovery in zinc oxide concentrate improved by 19.52%. Moreover, the total reagent cost of the whole new process significantly declined by 3.93 yuan per ton of ore.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Qing Sun,Jingsi Chen,Ziqian Zhao,Diling Yang,Yaoyu Xiao,Hao Zhang,Xin Ma,Hong Zhong,Hongbo Zeng
Stepwise separation of multi-species with a single type of chemical additives (such as surfactants) is an auspicious but challenging issue in many engineering processes as one surfactant usually lacks the ability to interact with different components. One promising strategy is to develop an environment-responsive surfactant, which possesses various functional groups to anchor target constituents under different environmental conditions. In this work, we have prepared a pH-responsive surfactant (2-(benzylthio)-acetohydroxamic acid, BTHA) possessing two pH-switchable groups (i.e., thioether and hydroxamate) that can selectively interact with different target substances, thus enabling stepwise and efficient separation of a three-component mineral system. The single in-house synthesized BTHA is successfully applied to the sequential separation of pyrite, diaspore, and kaolinite from high-sulfur bauxite by simply tuning the solution pH. Specifically, under the acidic condition (pH 6.0), the hydroxamate group of BTHA is deactivated, thus only the thioether groups can directionally interact with pyrite and enable the selective flotation recovery of pyrite to 85.9%. When the solution pH is subsequently increased to 8.0, the active hydroxamate group of BTHA can tightly chelate with diaspore and result in its efficient separation from kaolinite. The bifunctional surfactant exhibits strong and selective interactions with target substrates via pH modulation, allowing the adsorption selectivity and efficient stepwise separation, which provides an innovative paradigm for the development of novel surfactants with diverse applications in the mineral, metallurgical, chemical, and renewables recycling industry.
研究领域:
矿物加工工程
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Microbiology
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2022
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IF 6.064
Huang Ming-Qing,Zhang Ming,Zhan Shu-Lin,Chen Lin,Xue Zhen-Lin
In situ fragmentation bioleaching is a promising way to perform deep mining safely, economically, and in an environmentally friendly manner, where oxygen plays a critical role in microbial growth and mineral dissolution. However, the lack of oxygen limits the implementation of in-situ fragmentation bioleaching. To overcome this limitation, aeration was proposed, with saturated dissolved oxygen concentration as an important indicator. Orthogonal experiments were conducted to measure saturated dissolved oxygen concentration at various temperature, pH, and electrolyte (ferrous sulfate, ferric sulfate, copper sulfate, and sulfuric acid) concentration conditions. Experimental data were analyzed by Python programming language and least squares method to obtain a saturated dissolved oxygen concentration model. Results showed that temperature had the most significant effect on oxygen solubility, which was concluded by comparing the results of surface fitting based on the least squares method. At 30–40°C, the saturated dissolved oxygen concentration decreased faster as metal ions concentration increased. The conjoint effect of the five variables on oxygen solubility showed that pH was linearly negatively related to oxygen solubility. Additionally, a mathematical model was also proposed to predict the saturated dissolved oxygen concentration in in situ fragmentation bioleaching of copper sulfide ores. This work enables bioleaching processes to be modeled and controlled more effectively.
研究领域:
微生物学
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采矿工程
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
MEASUREMENT
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2025
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IF 5.6
Yongsheng Zhang,Jian Yuan,Tao Xu,Yang Wang,Xiaonan Chen,Hua Yao,Wanxue Li,Lei Dong,Weiguang Ma,Lei Zhang,Wangbao Yin,Suotang Jia
Understanding the elemental composition of polymetallic minerals, particularly strategic metals, is essential for optimizing the development and utilization of critical mineral resources. This study introduces a rapid, cost-effective analytical method for the determination of strategic metals in polymetallic minerals using an in-house developed total reflection X-ray fluorescence (TXRF) system. This system is equipped with an Rh X-ray tube, a four-knife slit, a silicon drift detector, and Python-based spectral processing software, achieving detection limits ranging from 104.94-4.22 mg kg −1 for elements with atomic number (Z) from 11 to 38 and 86. Solid samples were prepared as suspensions by mixing 10 mg of powder in 1 mL of ethylene glycol, and Ga as internal standard was added. The quantitative analysis accuracy of the system was validated using cobalt-rich nodule standard reference material. Its application to real-world copper-nickel sulfide ores exhibited a strong linear correlation with inductively coupled plasma atomic emission spectroscopy (R 2 = 0.9929) and yielded results comparable to those obtained with a commercial Mo-TXRF spectrometer (R 2 = 0.9919). These findings were demonstrated the suitability of the in-house developed TXRF system for the analysis of polymetallic minerals, and provide a valuable reference for its application.
研究领域:
矿物学
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分析化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Chao Li,He Kang,Ai Wang,Boai Zhang,Yijun Cao
Fluidized-bed flotation is a novel process with combined features of flotation and density separation. The application of fluidized-bed flotation in grinding circuit to reject coarse gangues for sulfide ores has been increasingly attracting attentions. Previous studies have focused on the effect of mineral liberation on coarse particle separation. Little work has yet been conducted to simultaneously investigate the effect of mineral liberation, particle and bubble sizes on the fluidized-bed flotation efficiency. The lack of this work has hindered the process optimization to some extent. In this study, three sizes of bubbles (498 μm, 1200 μm, 1952 μm) were generated to separate molybdenite ores under three particle size fractions (150–450 μm, 450–700 μm and 700–1000 μm) in a fluidized-bed flotation column (80 mm in diameter). For the 150–450 μm and 450–700 μm particles, small bubbles of 498 μm could achieve separation by effectively reducing the particle density. For the 700–1000 μm particles with greater mass, intermediate bubble of 1200 μm was required to reduce the particle density for separation. No separation was observed for the three particle size classes with the oversized bubbles of 1952 μm due to high bubble detachment probability. It was concluded that fluidized-bed flotation is a consequence of matched bubble and particle sizes affected by the exposure rate of hydrophobic mineral and its distributing discreteness, the underlying mechanism for which was discussed. It is believed that the outcomes of this work could facilitate the optimization of fluidized-bed flotation in coarse gangue rejecting for sulfide ores.
研究领域:
矿物加工
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2025
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IF 5
Hao Wang,Qinshan Liu,Mengdi Xu,Lei Xie,Yaowen Xing,Xiahui Gui
Flotation is a core technology for the upgrading and purification of sulfide ores, and it has been widely applied in industrial production. In industrial flotation processes, operators heavily rely on visual inspection of froth conditions to adjust operating parameters, which leads to strong subjectivity, poor stability, and delayed feedback. In recent years, machine vision technology has been widely adopted for flotation froth image classification. However, most existing methods rely on traditional clustering or other classification models, which struggle to handle practical challenges such as label scarcity and large variations in operating conditions. Moreover, the mapping between image features and flotation conditions remains unclear. To address these challenges, this study proposed a semi-supervised clustering-based method for fine classification of flotation froth images, aiming to establish a quantitative relationship between image features and flotation conditions. First, based on a self-constructed flotation experiment platform under multiple operating conditions, froth images were collected under varying impeller speeds and collector dosages. Subsequently, multidimensional features including color, texture, and size were extracted. A mutual information-based method was then employed for dimensionality reduction and feature selection, resulting in compact feature vectors. On this basis, an “Eff-Collector” kernel function was constructed by incorporating operating conditions. Unsupervised clustering pseudo-labels were used to guide Gaussian kernel-based clustering, thereby building a semi-supervised clustering model constrained by operating conditions. This method effectively improves froth image classification accuracy under limited labeling conditions and enhances the ability of clustering results to represent actual operating conditions. The average accuracy of operating condition identification from froth images exceeds 94.89 %, with the standard deviation of major clustering categories across multiple trials remaining below 3 %. These results provide a solid theoretical foundation and a practical technical pathway for reagent regulation and intelligent monitoring in flotation processes.
✓ 已验证
产品关联
DOI
高影响因子
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