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采用钛阴极从碱液中旋流电积回收镓

Transactions of Nonferrous Metals Society of China 2024年第3期34卷 1027-1036页

作者：许志鹏刘左伟郭学益李栋邹铭金田庆华中南大学冶金与环境学院长沙410083 有色金属资源循环利用国家地方联合工程研究中心长沙410083

为了抑制浓差极化并提高电流效率,提出一种旋流电解法回收镓的工艺。通过电化学研究确定GaO_(2)^(-)在120 g/L NaOH溶液中的扩散系数为1.65×10^(-7)cm^(2)/s。考察各种参数对镓电积的影响,确定电积的最佳条件为:钛阴极、电流密度750 A/... 详细信息

为了抑制浓差极化并提高电流效率,提出一种旋流电解法回收镓的工艺。通过电化学研究确定GaO_(2)^(-)在120 g/L NaOH溶液中的扩散系数为1.65×10^(-7)cm^(2)/s。考察各种参数对镓电积的影响,确定电积的最佳条件为:钛阴极、电流密度750 A/m^(2)、镓浓度39.9 g/L、NaOH浓度120 g/L、循环流量200L/h。在这些条件下,电积的电流效率和镓回收率分别为47.9%和90.2%。析出的镓较易从阴极上分离,经过洗涤后的镓最终纯度为99.993%。镓旋流电积能耗约为9048 kW·h/t。该研究表明旋流电积是一种具有高电流效率和低能耗的有前途的镓生产工艺。

关键词：镓旋流电积砷化镓废料电流效率

ANALYSIS OF EDL EFFECTS ON THE FLOW AND FLOW STABILITY IN MICROCHANNELS

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Journal of Hydrodynamics 2010年第5期22卷 725-731页

作者： YOU xue-yi guo Li-xiang School of Environmental Science and Engineering Tianjin University 300072 Tianjin China

The effects of the Electrical Double Layer （EDL） on the liquid mean flow and the flow stability in microchannels are investigated by solving the Poisson-Boltzmann equation. The models of the traditional streaming Electrical Current Balance （ECB） and the newly introduced streaming Electrical Current Density Balance （ECDB） are applied to determine the electrical streaming current. The numerical results show that the electrical streaming current backflow in the ECB model near the wall can be removed by using the ECDB model, which is suitable to study the effects of the EDL on the mean flow and the flow stability in microchannels. The flow is found more unstable if the ECDB model is applied.

关键词： electrical double layer Poisson-Boltzmann equation electrical streaming current balance flow stability microchan

Recovery of gold from refractory gold ores: Effect of pyrite on the stability of the thiourea leaching system

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International Journal of Minerals,Metallurgy and Materials 2021年第6期28卷 956-964页

作者： Hong Qin xue-yi guo Qing-hua Tian Lei Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha 410083China

The extraction of gold from refractory gold ores(RGOs)without side reactions is an extremely promising ***,most RGOs contain large amounts of sulfide,such as ***,investigation of the influence of sulfide on the gold leaching process is important to maximize the utilization of *** this work,the effects of pyrite on the stability of the thiourea system were systematically investigated under different *** showed that the decomposition rate of thiourea was accelerated sharply in the presence of *** effect of pyrite on gold recovery in thiourea leaching systems was then confirmed via a series of *** decomposition efficiency of thiourea decreased by 40%and the recovery efficiency of gold increased by 56%after the removal of sulfide by *** optimal conditions,the efficiency of the gold recovery system increased to 83.69%and only 57.92%of thiourea decomposition was *** high consumption of thiourea by the leaching system may be attributed to not only adsorption by mineral particles but also catalytic decomposition by some impurities in the ores,such as pyrite and soluble ferric oxide.

关键词： thiourea leaching stability pyrite refractory gold ores

Application of response surface methodology in optimizaing thesulfation-roasting-leaching process of nickel laterite

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International Journal of Minerals,Metallurgy and Materials 2012年第3期19卷 199-204页

作者： xue-yi guo Dong Li Zhan Wu Qing-hua Tian School of Metallurgical Science and Engineering Central South UniversityChangsha 410083China

Nickel was recovered from nickel laterite using a sulfation-roasting-leaching process and the effects of operation parameters in- cluding acid addition, roasting temperature, and roasting time on nickel extraction and iron dissolution were investigated using response sur- face methodology （RSM）. Two second-order polynomial models of high significance were presented to show the relationship between the responses and the variables. The analysis of variance （ANOVA） showed high coefficients of determination （R2） of 0.894 and 0.980 for the two models, respectively. Optimum areas of 〉-80% Ni extraction and 〈5% Fe dissolution were obtained by the overlaid contours. Verification experiments in the optimum areas were conducted and the results indicate a close agreement with the predicted values obtained from the models.

关键词： nickel laterite sulfation roasting leaching optimization response surface methodology

Adsorption of Re(Ⅶ) by coated solvent-impregnated resins containing Alamine 304-1 from sulfuric acid solutions

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Rare Metals 2020年第8期39卷 942-950页

作者： xue-yi guo Zhong-Chen Ma Gao-Wei Liu Dong Li Qing-Hua Tian School of Metallurgy and Environment Central South UniversityChangsha 410083China National and Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha 410083China

The recovery of rhenium from waste acid is an urgent issue due to low rhenium concentration and high sulfuric *** solve the problem,novel coated solvent-impregnated resins consisting of inert resins LS-300,Alamine 304-1 and the PVA film(304-CSIRs)were prepared for the separation of Re(Ⅶ)from high sulfuric acid *** was shown that the PVA film coated completely on the surfaces of LS-300 resins with a thickness of 5μm,and Alamine 304-1 distributed completely inside the porous of LS-300 *** adsorption fitted well with Langmuir model and pseudo-second-order model with the saturation adsorption capacity of139.40 mg·*** maximum separation factor of Re(Ⅶ)versus Cu(Ⅱ)was up to 483,and 304-CSIRs had no adsorptions for As(V).The adsorption capacity of Re(Ⅶ)onto 304-CSIRs maintained in 97.79%at the fifth adsorption-desorption cycle.99.87%of rhenium was recovered by 304-CSIRs from waste acid generated from a copper smelter.

关键词： Adsorption Re(Ⅶ) Coated Solvent-impregnated resins Alamine 304-1

Relationship between copper content of slag and matte in the SKS copper smelting process

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 301-308页

作者： Qin-meng Wang Song-song Wang Miao Tian Ding-xuan Tang Qing-hua Tian xue-yi guo School of Metallurgy and Environment Central South University Hunan Key Laboratory of Nonferrous Metal Resources Recycling School of Mineral Processing and Bioengineering Central South University

In the newly developed oxygen-enriched bottom-blowing copper smelting process(also known as the SKS copper smelting process), Cu loss in slag is one of the most concerning issues. This paper presents our research results concerning the relationship between the Cu content of the matte and slag in the SKS process; the results are based on actual industrial production in the Dongying Fangyuan copper smelter. The results show that the matte grade strongly influences Cu losses in slag. The dissolved and entrained losses account for 10%–20% and 80%–90% of the total SKS industrial Cu losses in slag, respectively. With increasing matte grade, the dissolved and entrained Cu losses in the SKS slag both increase continuously. When the matte grade is greater than 68%, the content of Cu in the smelting slag increases much more dramatically. To obtain a high direct recovery of copper, the matte grade should be less than 75% in industrial SKS copper production.

关键词： copper smelting oxygen-enriched bottom-blowing matte grade Cu loss SKS process

Electrodeposited transparent PEDOT for inverted perovskite solar cells:improved charge transport and catalytic performances

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Rare Metals 2021年第9期40卷 2402-2414页

作者： Cong-Tan Zhu ying Yang Fei-Yu Lin Yuan Luo Shu-Peng Ma Liu Zhu xue-yi guo School of Metallurgy and Environment Central South UniversityChangsha 410083China First Rare Materials Co. LtdQingyuan 511517China

The acidic, corrosive effect of sodium polystyrene sulfonate(PSS) in poly 3,4-ethylenedioxythiophene:sodium polystyrene sulfonate(PEDOT:PSS) limits the stability of inverted perovskite solar cells(PSCs) based on the ITO/PEDOT:PSS/perovskite/PCBM/BCP/Ag structure. In this work, a poly 3,4-ethylenedioxythiophene(PEDOT) hole transport layer(HTL) with high hole mobility and good catalytic performance was prepared by electrochemical cyclic voltammetry(CV) method for inverted PSCs. By controlling the CV cycles(from 1 to 5 cycles) and EDOT monomer solution concentration(from0.5 to 2.0 mmol·L^(-1)) of electrochemical deposition, the thickness, morphology, optical and electrochemical properties of PEDOT could be accurately adjusted. The optimal photovoltaic performance with current density(J_(sc)) of 22.19 mA·cm^(-2), open circuit voltage(V_(oc)) of 0.94 V, fill factor(FF) of 0.65 and photoelectric conversion efficiency of 13.56% was obtained when deposition of PEDOT with 1 CV cycle and EDOT concentration of 0.5 mmol·L^(-1). At this point, the perovskite showed good crystallization,optimal optical, charge transport and recombination performance, resulting in better V_(oc)and photoelectric conversion efficiency(PCE) compared to the devices with higher CV cycle numbers and 3,4-ethylenedioxythiophene(EDOT) concentration. For comparison with spin-coated PEDOT:PSS, the device with electrodeposited PEDOT showed improved J_(sc)and comparable V_(oc), which may result from its better charge transport and catalytic *** device with spin-coated PEDOT:PSS showed photoelectric conversion efficiency of 12.25%, which was lower than that based on electrodeposited PEDOT(13.56%) with1 CV cycles and 0.5 mmol·L^(-1) EDOT concentration. And the device with electrodeposited PEDOT as HTLs showed more excellent air stability. In ambient air((32 ± 5) ℃ and RH: 70% ± 20%), it still maintained more than 80%of the initial photoelectric conversion efficiency after1000 h. In comparison, the photoe

关键词： Electrochemically cyclic voltammetry Inverted perovskite solar cells Electrodeposited PEDOT Hole mobility Tafel analysis

Tungsten and arsenic substance flow analysis of a hydrometallurgical process for tungsten extracting from wolframite

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Tungsten 2021年第3期3卷 348-360页

作者： Yuan-Lin Chen xue-yi guo Qin-Meng Wang Qing-Hua Tian Shao-Bo Huang Jin-Xiang Zhang School of Metallurgy and Environment Central South UniversityChangsha 410083China Changsha Research Institute of Mining and Metallurgy Co.LTD Changsha 410012China Ganzhou Nonferrous Metallurgy Research Institute Ganzhou 341000China

In this study,the metabolism of a hydrometallurgical process for tungsten extracting from wolframite was studied through substance flow *** mass balance accounts,substance flow charts of tungsten and arsenic were established to evaluate the metabolism efficiency of the investigated *** results showed that,the total tungsten resource efficiency of the system was 97.56%,and the tungsten recovery of unit process autoclaved alkali leaching,ion exchange,Mo removing,concentration and crystallization was 98.16%,98.94%,99.71%,99.89%,***,for extracting 1 ton of tungsten into the qualified ammonium paratungstate,10.0414 kg of arsenic was carried into the system,with the generation of 7.2801 kg of arsenic in alkali leaching residue,1.5067 kg of tungsten in arsenic waste residue,and 1.2312 kg of tungsten in Mo ***,7.9 g of arsenic was discharged into nature environment with waste water,15.5 g of arsenic was entrained into the final *** distribution and transformation behaviors of arsenic during production were analyzed through phases change analysis,and some recommendations for improving the resource efficiency of tungsten and pollution control during production were also proposed based on the substance flow analysis in this study.

关键词： Tungsten Arsenic Substance flow analysis Resource efficiency Pollution control

Reducing structural degradation of high-voltage single-crystal Ni-rich cathode through in situ doping strategy

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Rare Metals 2023年第9期42卷 2993-3003页

作者： Xin-Ming Fan Zhi Zhang Gao-Qiang Mao ying-Jie Tong Ke-Bo Lin Hui Tong Wei-Feng Wei Qing-Hua Tian xue-yi guo Powder Metallurgy Research Institute Central South UniversityChangsha410083China School of Metallurgy and Environment Central South UniversityChangsha410083China National&Regional Joint Engineering Research Center of Nonferrous Metal Resource Recycling Changsha410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha410083China College of Chemistry and Materials Engineering Hunan University of Arts and ScienceChangde415000China

Polycrystalline Ni-rich layered oxide (Li Ni_(x)Co_(y)Mn_zO_(2)(NCM),x>0.8) cathode material with high specific capacity and low cost is considered as one of the most promising candidate materials for lithium-ion batteries (LIBs).However,it suffers from severe structural and capacity degradation during practical cycling,especially under harsh operation condition(ultrahigh cutoff voltage and elevated temperature,etc.).One promising approach to mitigate these issues is to develop a single-crystal Ni-rich NCM cathode,which could enhance structural integrity and improve capacity retention,due to its robust and stable micro-sized primary ***,the improved cyclic stability comes at the expense of reversible capacity and rate capability,owing to the relatively low Li^(+) diffusion efficiency for its micron-sized primary ***,the structural degradation and exacerbation of interfacial reactions for the Ni-rich NCM cathode under highvoltage (≥4.5 V) would quickly trigger the poor electrochemical performance,limiting its practical ***,Li Ni_(0.827)Co_(0.11)Zr_(0.003)Mn_(0.06)O_(2)(Zr@SC-N_(83)) cathode material was successfully synthesized via the in situ doping *** could not only effectively maintain the reversibility of phase transition between H2 and H3 after long-term cycling at high voltage (4.6 V),but also enhance lithium-ion diffusion,thus improving the cycling performance and good rate performance for the Zr@SC-N_(83)*** a result,0.3 wt%Zrdoping cathode delivers an initial discharging capacity of 200.1 m Ah·g^(-1)at 1.0C and at the high cutoff voltage of 4.6 V,exhibiting the satisfactory capacity retention of 85.5%after *** provides an effective route toward low-cost and higher energy density for lithium-ion batteries with Ni-rich cathode.

关键词： Single-crystal Ni-rich LiNi_(x)Co_(y)Mn_zO_(2)(NCM) In situ doping strategy High voltage Structural integrity Cycling stability