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Transformation behavior of ferrous sulfate during hematite precipitation for iron removal

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Transactions of Nonferrous Metals Society of China 2020年第2期30卷 492-500页

作者： Zhi-gan DENG Fan YANG Chang WEI Bei-ping ZHU Peng ZENG Xing-bin li cun-xiong li Min-ting li Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan Hualian Zinc and Indium Co. Ltd.Wenshan 663701China Yunnan Yuntong Zinc Co. Ltd.Kunming 650102China

The transformation behavior of ferrous sulfate was examined during hematite precipitation for iron removal in hydrometallurgical ***,the effects of the method used for oxygen supply(pre-crystallization or pre-oxidation of ferrous sulfate)and temperature(170–190℃)on the redissolution and oxidation–hydrolysis of ferrous sulfate were *** precipitation characteristics and phase characterization of the hematite product were *** results showed that the solubility of ferrous sulfate was considerably lower at elevated *** dissolution behavior of ferrous sulfate crystals was influenced by both the concentrations of free acid and zinc sulfate and the oxydrolysis of ferrous *** oxydrolysis of ferrous ions may serve as the dissolution driving *** precipitation proceeded via the following sequential steps:crystallization,redissolution,oxidation,and precipitation of ferrous *** dissolution of ferrous sulfate was slow,which helped to maintain a low supersaturation environment,thereby affording the production of high-grade hematite.

关键词： hydrometallurgical zinc crystallization of ferrous sulfate hematite precipitation for iron removal

Adaptive-basis decomposition-based low-rank network for efficient non-uniform motion deblurring

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Optoelectronics Letters 2025年第1期21卷 43-50页

作者： CHEN Lei xiong Qingbo ZHANG Wei li Runde School of Software Henan University School of Applied Technology China University of Labor Relations

In this study, we present a unified sparsity-driven framework that significantly enhances motion deblurring performance by integrating two key components: a custom-designed dataset and a low-rank module(LRM). This framework leverages the inherent sparsity of per-pixel blur kernels to bolster both deblurring accuracy and model interpretability. Firstly, we propose an adaptive-basis decomposition-based deblurring(ADD) approach, which constructs a tailored training dataset to enhance the generalization capacity of the deblurring network. The ADD framework adaptively decomposes motion blur into sparse basis elements, effectively addressing the intricacies associated with non-uniform blurs. Secondly, an LRM is proposed to improve the interpretability of deblurring models as a plug-and-play module, primarily designed to identify and harness the intrinsic sparse features in sharp images. A series of ablation studies have been conducted to substantiate the synergistic advantages of combining the proposed ADD with the LRM for overall improvement in deblurring efficacy. Subsequently, we empirically demonstrate through rigorous experimentation that incorporating the LRM into an existing Uformer network leads to substantial enhancement in reconstruction performance. This integration yields a sparsity-guided low-rank network(SGLRN). Operating under the overarching principle of sparsity, SGLRN consistently outperforms state-of-the-art methods across multiple standard deblurring benchmarks. Comprehensive experimental results, assessed through quantitative metrics and qualitative visual evaluations, provide compelling evidence of its effectiveness. The overall deblurring results are available at Google Drive.

关键词： Image enhancement

CO2-mediated bicarbonate conversion to concentrated formate in a CEM-based electrolyzer

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Journal of Energy Chemistry 2025年第1期100卷 605-611页

作者： Haocheng xiong Donghuan Wu Haonan li Andrew li Qikun Hu Siyao Song Bingjun Xu Qi Lu State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University College of Chemistry and Molecular Engineering Peking University Ordos Laboratory

Renewable energy-driven bicarbonate conversion to valuable chemicals presents an attractive strategy for mitigating CO2emissions,as bicarbonate can be efficiently generated from the capture of atmospheric CO2using alkaline solutions with reactive *** this work,we present a CO2-mediated bicarbonate conversion to pure formate using a cation exchange membrane-based electrolyzer with a 25 cm2electrode *** electrolysis achieved selectivities exceeding 75%for formate at a total current of 2.5 A,achieving formate concentrations up to 1.2 M and yields as high as 95%over extended *** techno-economic assessment confirmed the economic viability of the process,highlighting the potential for bicarbonate electrolysis as a sustainable method for producing valuable chemicals.

关键词： Electrocatalysis Techno-economic assessments Electrochemistry Flow electrolyzer

Reductive leaching of zinc and indium from industrial zinc ferrite particulates in sulphuric acid media

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Transactions of Nonferrous Metals Society of China 2016年第9期26卷 2495-2501页

作者：张帆魏昶邓志敢李存兄李兴彬李旻廷昆明理工大学冶金与能源工程学院昆明650093

Zinc ferrite is the principal constituent in zinc neutral-leach residue（NLR） which is commonly treated by hot-acid leaching in electrolytic zinc plants. Reductive leaching of zinc ferrite with sphalerite concentrate as a reducing agent was performed. It was found that leaching of zinc ferrite in the presence of sphalerit concentrate was a viable process that effectively extracted zinc and indium and converted Fe^3＋ into Fe^2＋ at the same time. Reflux leaching tests by two stages were performed to achieve extractions of 98.1% for zinc and 97.5% for indium, and a Fe^2＋/Fe^3＋ molar ratio of 9.6 in leach solution was also obtained. The leaching behaviors of other elements, such as iron, copper and tin were also studied. The results showed that iron and copper were completely leached, whereas tin presented lower extraction values.

关键词： reductive leaching zinc ferrite zinc indium sphalerite concentrate

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次氧化锌酸性浸出液中萃取分离铟的工艺

中国有色金属学报 2017年第12期27卷 2590-2597页

作者：郭小东魏昶李兴彬邓志敢李存兄李旻廷昆明理工大学冶金与能源工程学院昆明650093

以次氧化锌酸性浸出液为原料,采用两段溶剂萃取的方法实现铟与其他金属离子的有效分离,并循环利用工艺过程中使用的盐酸,减少氯离子的排放。研究采用P204从浸出液中萃取、盐酸反萃铟的行为,以及采用TBP/P350混合萃取剂从P204载铟有机相... 详细信息

以次氧化锌酸性浸出液为原料,采用两段溶剂萃取的方法实现铟与其他金属离子的有效分离,并循环利用工艺过程中使用的盐酸,减少氯离子的排放。研究采用P204从浸出液中萃取、盐酸反萃铟的行为,以及采用TBP/P350混合萃取剂从P204载铟有机相盐酸反萃液中选择性萃取铟、水反萃等过程中铟的行为,考察萃取剂浓度、混合时间、酸浓度和相比等因素对铟萃取率和反萃率的影响。结果表明:采用10%P204(体积分数)在相比(A/O)为2/1的条件下,经过2级逆流萃取,浸出液中99%铟被萃取,得到的P204载铟有机相采用6 mol/L盐酸反萃,铟反萃率达100%。得到的含铟盐酸反萃液再采用TBP/P350选择性萃取铟,在相比为3/2条件下,经过2级逆流萃取,铟萃取率为99%,得到的载铟有机相采用纯净水进行3级逆流反萃,铟被反萃完全。与传统工艺相比,氯离子排放量减少86%。基于上述实验结果,提出从次氧化锌酸性浸出液中萃取分离铟的工艺流程,在实现铟高效回收的同时,降低氯离子的排放,达到资源高效利用和减少污染物排放的目的。

关键词：次氧化锌酸性浸出液铟萃取载铟有机相

Influence of introducing Zr,Ti,Nb and Ce elements on externally solidified crystals and mechanical properties of high-pressure die-casting Al–Si alloy

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International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 147-153页

作者： Junjie li Wenbo Yu Zhenyu Sun Weichen Zheng liangwei Zhang Yanling Xue Wenning liu Shoumei xiong Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Traffic&Transportation Engineering Central South UniversityChangsha 410075China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

High pressure die casting(HPDC)AlSi10Mn Mg alloy castings are widely used in the automobile *** can optimize the mechanical properties of castings through heat treatment,while the release of thermal stress arouses the deformation of large integrated ***,the development of non-heat treatment Al alloys is becoming the hot *** addition,HPDC contains externally solidified crystals(ESCs),which are detrimental to the mechanical properties of *** achieve high strength and toughness of non-heat treatment die-casting Al-Si alloy,we used AlSi9Mn alloy as matrix with the introduction of Zr,Ti,Nb,and *** influences on ESCs and mechanical properties were systematically investigated through three-dimensional reconstruction and thermodynamic *** results reveal that the addition of Ti increased ESCs'size and porosity,while the introduction of Nb refined ESCs and decreased ***,large-sized Al_3(Zr,Ti)phases formed and degraded the mechanical *** introduction of Ce resulted in the poisoning effect and reduced mechanical properties.

关键词： aluminium alloy high-pressure die-casting externally solidified crystals non-heat treatment

Formation and evolution of supercritical geofluid

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Science China Earth Sciences 2025年第1期68卷 39-51页

作者： Huaiwei NI Yilin XIAO Xiaolin xiong Xiandong liU Chunxiao GAO Yi-Xiang CHEN Yunguo li Wan-Cai li Xuan GUO Yang-Yang WANG Dong-Bo TAN li ZHANG State Key Laboratory of lithospheric and Environmental Coevolution University of Science and Technology of China Deep Space Exploration Laboratory/School of Earth and Space Sciences University of Science and Technology of China Guangzhou Institute of Geochemistry Chinese Academy of Sciences School of Earth Sciences and Engineering Nanjing University State Key Lab of Superhard Materials Jilin University

In this work, we provide a comprehensive review on the formation, evolution, properties, and effects of supercritical geofluid. In Earth's interior, enhanced miscibility between H2O and silicate by the addition of special components or by the increase of pressure and temperature gives rise to supercritical geofluid with a significant amount of both H2O and silicate *** formation of supercritical geofluid in magmatic-hydrothermal systems, typified by pegmatite system, is governed by meltfluid critical curve. The formation of supercritical geofluid in metamorphic systems, typified by subducted slab, is governed by the second critical end point. Experimental results suggest that the presence of boron and fluorine in pegmatite system makes it possible to form supercritical geofluid at crustal depths, but the release of supercritical geofluid from subducted slab is withheld until almost 100 km depth. A major presence of both H2O and depolymerized structural units（monomers, dimers, etc.） endows supercritical geofluid with unique physical properties including low density, low elastic moduli, low viscosity, high diffusivity,and high electrical conductivity. Supercritical geofluid can effectively mobilize a variety of elements even including high field strength elements and heavy rare earth elements. The chemical signatures of supercritical geofluid can be inherited by metasomatized mantle and mantle-derived melts, and this could give an explanation of the oxidation of arc magmas. Phase separation of supercritical geofluid through the mechanism of spinodal decomposition leads to formation of a melt network. Multiphase fluid inclusions recovered from subduction zone rocks and pegmatites are possible relics of supercritical geofluid. Supercritical geofluid can cause electrical anomaly and low seismic velocity near the top of subducted slab, and can be linked with intermediate-focus earthquakes. Supercritical geofluid may have played a crucial role in the formation of pe

关键词： Supercritical geofluid Miscibility Subduction zone Pegmatite

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Effect of Bi/Si Ratio of BiBSi Glass on Its Structure, Properties and Laser Sealing Shear Strength for Vacuum Glazing

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 13-24页

作者： liU Wei JIAO Jinxu LUO Dusha ZHOU Junjie SHI lifen WANG Weiwei li Changqing WANG Peng xiong Dehua li Hong State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Silica-Based Materials Laboratory of Anhui Province CNBM Research Institute for Advanced Glass Materials Group Co.LtdBengbu 233018China State Key Laboratory of Advanced Technology for Float Glass CNBM Research Institute for Advanced Glass Materials Group Co.LtdBengbu 233018China

The low-melting glass of Bi2O_(3)-B2O_(3)-SiO_(2)(BiBSi)system was used for the first time for laser sealing of vacuum *** the condition of constant boron content,how the structure and properties vary with Bi/Si ratio in low-melting glass was *** addition,the relationships between laser power,low-melting glass solder with different Bi/Si ratios and laser sealing shear strength were *** results show that a decrease in the Bi/Si ratio can cause a contraction of the glass network of the low-melting glass,leading to an increase of its characteristic temperature and a decrease of its coefficient of thermal *** laser sealing,the copper ions in the low-melting glass play an endothermic role.A change in the Bi/Si ratio will affect the valence state transition of the copper ions in the low-melting *** absorbance of the low-melting glass does not follow the expected correlation with the Bi/Si ratio,but shows a linear correlation with the content of divalent copper *** greater the concentration of divalent copper ions,the greater the absorbance of the low-melting glass,and the lower the laser power required for laser *** shear strength of the low melting glass solder after laser sealing was tested,and it was found that the maximum shear strength of Z1 glass sample was the highest up to 2.67 MPa.

关键词： Bi2O_(3)-B2O_(3)-SiO_(2)(BiBSi) Bi/Si ratio low-melting glass laser sealing vacuum glazing

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合成异极矿元素硫水热硫化动力学(英文)

中国有色金属学会会刊：英文版 2013年第6期23卷 1815-1821页

作者：李存兄魏昶邓志敢李兴彬李旻廷樊刚徐红胜昆明理工大学冶金与能源工程学院昆明650093

研究了元素硫水热硫化合成异极矿的动力学研究,考察了搅拌转速(100～600r/min)、温度(120～220℃)、硫磺用量(摩尔比为0.6～1.6)和矿物粒度(48～246μm)对异极矿转化率的影响。结果表明:随着转化温度的升高和矿物粒度的减小,异极矿的转... 详细信息

研究了元素硫水热硫化合成异极矿的动力学研究,考察了搅拌转速(100～600r/min)、温度(120～220℃)、硫磺用量(摩尔比为0.6～1.6)和矿物粒度(48～246μm)对异极矿转化率的影响。结果表明:随着转化温度的升高和矿物粒度的减小,异极矿的转化率不断增大。当搅拌转速大于400r/min,硫磺理论摩尔比大于1时,其对异极矿的转化率影响不明显。异极矿元素硫水热硫化转化反应初期受化学反应控制,该过程的表观活化能为50.23kJ/mol,后期逐步转变为受固体产物层的扩散控制,其表观活化能为11.12kJ/mol。

关键词：水热硫化动力学合成异极矿硫