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International Journal of Minerals,metallurgy and Materials 2024年第9期31卷 2017-2024页

作者： Junjie Shi Yumo Zhai Yuchao Qiu Changle Hou Jingjing Dong Maoxi Yao Haolun Li Yongrong Zhou Jianzhong Li key laboratory for ecological metallurgy of Multimetallic Mineral(ministry of education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

The efficient recycling of vanadium from converter vanadium-bearing slag is highly significant for sustainable development and circular *** key to developing novel processes and improving traditional routes lies in the thermodynamic *** this study,the equilibrium phase relations for the Fe_(2)O_(3)-TiO_(2)-V_(2)O_(5)system at 1200℃in air were investigated using a high-temperature equilibrium-quenching technique,followed by analysis using scanning electron microscopy-energy dispersive X-ray spectrometer and X-ray photoelectron *** liquid-phase region,two two-phase regions(liquid-rutile and liquid-ferropseudobrookite),and one three-phase region(liquid-rutile-ferropseudobrookite)were *** variation in the TiO_(2)and V_(2)O_(5)contents with the Fe_(2)O_(3)content was examined for rutile and ferropseudobrookite solid ***,on further comparison with the predictions of FactSage 8.1,significant discrepancies were identified,highlighting that greater attention must be paid to updating the current thermodynamic database related to vanadium-bearing slag systems.

关键词： vanadium-bearing slag thermodynamics FactSage phase equilibria recovery

Interaction mechanism of cyanide with pyrite during the cyanidation of pyrite and the decyanation of pyrite cyanide residues by chemical oxidation

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International Journal of Minerals,metallurgy and Materials 2024年第9期31卷 1996-2005页

作者： Wenwen Han Hongying Yang Linlin Tong key laboratory for ecological metallurgy of Multimetallic Mineral(ministry of education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

The toxic cyanides in cyanide residues produced from cyanidation process for gold extraction are harmful to the *** is one of the main minerals existing in cyanide *** this work,the interaction of cyanide with pyrite and the decyanation of pyrite cyanide residue were *** revealed that high pH value,high cyanide concentration,and high pyrite dosage promoted the interaction of cyanide with *** cyanidation of pyrite was pseudo-second-order with respect to *** decyanation of pyrite cyanide residue by Na_(2)SO_(3)/air oxidation was *** cyanide removal efficiency was 83.9% after 1 h of reaction time under the optimal conditions of pH value of 11.2,SO_(3)^(2-) dosage of 22 mg·g^(-1),and air flow rate of 1.46 L·min^(-1).X-ray photoelectron spectroscopy analysis of the pyrite samples showed the formation of Fe(Ⅲ)and FeSO_(4) during the cyanidation *** cyanide that adsorbed on the pyrite surface after cyanidation mainly existed in the forms of free cyanide(CN^(-))and ferrocyanide(Fe(CN)_(6)^(4-)),which were effectively removed by Na_(2)SO_(3)/air *** the decyanation process,air intake promoted pyrite oxidation and weakened cyanide adsorption on the pyrite *** study has practical significance for gold enterprises aiming to mitigate the environmental impact related to cyanide residues.

关键词： pyrite cyanide decyanation sodium sulfite/air oxidation cyanide residue

Phosphorus fixation capacity of CaO-SiO_(2)-Al_(2)O_(3)-MnO-Ce_(2)O_(3) slag based on structural considerations

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Journal of Rare Earths 2023年第3期41卷 446-453,I0005页

作者： Jiali Sun Chengjun Liu Maofa Jiang key laboratory for ecological metallurgy of Multimetallic Ores(ministry of education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

The phosphorus fixation capacity of some slag systems,such as Ce_(2)O_(3)-containing slag,has hardly been investigated from a thermodynamics view due to the lack of relevant thermodynamic *** the macroscopic properties are primarily determined by the microscopic structure,the correlation between phosphorus fixation capacity and slag structure was explored by spectroscopy(XPS),Raman spectroscopy,and ferromanganese dephosphorization *** results show that the predominant species of P^(5+)are Q_(P)^(0)(PO_(4)^(3-))and Q_(P)^(1)(P_(2)O_(7)^(4-))units in the CaO^(-)SiO_(2)-Al_(2)O_(3)-MnO^(-)Ce_(2)O_(3)-P_(2)O_(5)quenched slag,and the phosphorus fixation capacity increases with the Q_(P)^(1)(P_(2)O_(7)^(4-))unit to Q_(P)^(0)(PO_(4)^(3-))unit transformation(the P-O^(0) bond to P-O^(-)bond transformation)since the electron cloud density between P and O atoms increases and the average radius of P-O bonds ***,CaO or Ce_(2)O_(3) as a network modifier can release the O_(2)-and promote the P-O^(0) bond to P-O^(-)bond(connected to Ca^(2+),/Ce^(3+))transformation in the quenched ***,the phosphorus enrichment phases in the slow cooling slag are confirmed as nCa_(2)SiO_(3)-Ca_(3)P_(2)O_(8)(nC_(2)S-C3P)and CePO_(4) solid solutions by the scan electron microscopy(SEM),transmission electron microscopy(TEM),and energy-dispersive spectrometer(EDS)*** re sults show Ce_(2)O_(3) can depolymerize the polyphosphate structure partially replacing CaO after introducing Ce_(2)O_(3) into CaO based slag because of its strong ability to donate *** above results not only help to understand the dependence of phosphorus fixation capacity on slag composition from a structural view,but also provide the theoretical guidance for optimizing the composition of Ce_(2)O_(3)-containing dephosphorization slag.

关键词： Phosphorus fixation capacity Slag structure X-ray photoelectron spectroscopy Raman spectroscopy Ce_(2)O_(3) CePO_(4)

Liquidus and phase equilibria in CaO-SiO2-5%MgO-20%Al2O3-TiO2 system

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Journal of Central South University 2017年第1期24卷 48-55页

作者：孙丽枫石俊杰张波邱吉雨王昭云姜茂发 School of metallurgy Northeastern UniversityShenyang 110819China key laboratory for ecological metallurgy of Multimetallic Ores of ministry of education(Northeastern University) Shenyang 110819China

The single hot thermocouple technique （SHTT） and high temperature equilibrium technique were combined to investigate the phase diagram of the CaO-SiO2-5%MgO-20%AlzO3-TiO2 system. The 1300 ℃ to 1500 ℃ liquidus lines are calculated according to the thermodynamic equations based on the pseudo-melting temperatures measured by the single hot thermocouple technique. The phase equilibria relationships are experimentally determined at 1400 ℃ using the high temperature equilibria technique followed by X-ray fluorescence （XRF）, X-ray diffraction（XRD）, scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDX） analysis. The liquid phase（L）, melilite solid solution phase （（C2MSz,C2AS）ss）, diopside phase（CMS2） and perovskite phase （CaO·TiO2） are found. Coupled with the liquidus lines and equilibria results, the phase diagram is constructed for the specified region of the CaO-SiO2-5%MgO-20%Al2O3-TiO2 system.

关键词： phase diagram liquidus equilibrium TiO2 single hot thermocouple technique (SHTT) thermodynamics

A new method for direct synthesis of Li2CO3 powders by membrane electrolysis

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Rare Metals 2018年第8期37卷 716-722页

作者： Xi-Juan Pan Ting-An Zhang Zhi-He Dou Guo-Zhi Lyu Xiu-Xiu Han Jun-Jie Zhang School of metallurgy Northeastern University Shenyang 110819 China key laboratory of ecological metallurgy of Multi-metal Intergrown Ores of education ministry Shenyang 110819China

A new method for the direct synthesis of Li2CO3 powders by membrane electrolysis from LiC1 solution is demonstrated in this paper, where a novel electrolysis system combining ventilation, agitation and loop filtration functions was reported. The aim of this work is to explore the effect of the starting concentration of LiC1 on the phase and micromorphology of Li2CO3 crystals and thereafter to explore the mechanism of crystallization and grain growth law. Scanning electron microscopy （SEM） images indicate that the particles become irregular polycrystalline from well-defined flower-like and the micro-crystals change from lamellar to needle-like and subsequently to smaller globular granules, and the surface of the crystals becomes smooth with LiC1 concentration increasing from 50 to 400 g.L^-3. The crystalline phases of the different samples were characterized using powder X-ray diffraction （XRD） and the results prove that pure LiaCO3 crystals can be obtained in a single step by the electrolysis method. The particle size distributions show that both volume mean crystal sizes and the full width at half maximum （FWHM） decrease when the starting LiC1 concentration increases from 50 to 300 g.L 3 and also decreases from 400 to 300 g-L^-3.

关键词： Lithium carbonate Lithium chloride Membrane electrolysis Carbon dioxide

Decomposition mechanism of chromite in sulfuric acid–dichromic acid solution

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International Journal of Minerals,metallurgy and Materials 2017年第12期24卷 1361-1369页

作者： Qing Zhao Cheng-jun Liu Bao-kuan Li Mao-fa Jiang key laboratory for ecological metallurgy of Multimetallic Ores(ministry of education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg–Al, Mg–Fe, and Mg–Cr in the powdered and lump states were synthesized and used as raw materials to investigate the decomposition mechanism of chromite in sulfuric acid–dichromic acid solution. The leaching yields of metallic elements and the changes in morphology of the spinel were studied. The experimental results showed that the three spinels were stable in sulfuric acid solution and that dichromic acid had little influence on the decomposition behavior of the Mg–Al spinel and Mg–Fe spinel because Mg^(2+), Al^(3+), and Fe^(3+) in spinels cannot be oxidized by Cr^(6+). However, in the case of the Mg–Cr spinel, dichromic acid substantially promoted the decomposition efficiency and functioned as a catalyst. The decomposition mechanism of chromite in sulfuric acid–dichromic acid solution was illustrated on the basis of the findings of this study.

关键词： hydrometallurgy chromite sulfuric acid leaching spinel decomposition mechanism

Flow and penetration behavior of submerged side-blown gas

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International Journal of Minerals,metallurgy and Materials 2023年第6期30卷 1067-1077页

作者： Shuai Zhu Qiuyue Zhao Xiaolong Li Yan Liu Tianci Li Ting’an Zhang key laboratory of ecological metallurgy of Multi-metal Intergrown Ores of ministry of education Shenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

To assess the widely used submerged side-blowing in pyrometallurgy,a high-speed camera-digital image processing-statistical approach was used to systematically investigate the effects of the gas flow rate,nozzle diameter,and inclination angle on the space-time distribution and penetration behavior of submerged side-blown gas in an air-water *** results show that the gas motion gradually changes from a bubbling regime to a steady jetting regime and the formation of a complete jet structure as the flow rate *** the flow rate is low,a bubble area is formed by large bubbles in the area above the *** the flow rate and the nozzle diameter are significant,a bubble area is formed by tiny bubbles in the area above the *** increased inclination angle requires a more significant flow rate to form a complete jet *** the sampling time,the dimensionless horizontal and vertical penetration depths are Gaussian *** the nozzle diameter and increasing the flow rate or inclination angle will increase the distribution range and *** correlations for a penetration depth with an error of±20%were obtained through dimensional *** dimensionless horizontal penetration depth of an argon-melt system in a 120 t converter calculated by the correlation proposed by the current study is close to the result calculated by a correlation in the literature and a numerical simulation result in the literature.

关键词： submerged side-blowing jet high-speed camera image processing dimensional analysis

Biooxidation-thiosulfate leaching of refractory gold concentrate

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International Journal of Minerals,metallurgy and Materials 2020年第8期27卷 1075-1082页

作者： He-fei Zhao Hong-ying Yang Lin-lin Tong Qin Zhang Ye Kong key laboratory for ecological metallurgy of Multimetallic Mineral(ministry of education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

A process of biooxidation followed by thiosulfate leaching of gold from refractory gold concentrate was *** studies on the concentrate showed that very fine gold grains(<10μm)were encapsulated in pyrite and arsenopyrite,while the proportion of monomer gold was only 21%.The gold-bearing sample was identified as a high-sulfur fine-sized wrapped-type refractory gold *** gold leaching efficiency obtained by direct cyanidation was only 59.86%.After biooxidation pretreatment,the sulfide minerals were almost completely decomposed,92 wt%of the mineral particles of the biooxidation residue were decreased to<38μm,and the proportion of monomer gold in the biooxidation residue was over 86%.Meanwhile,the gold content in the biooxidation residue was enriched to 55.60 g/t,and the S,Fe,and As contents were reduced to approximately 19.8 wt%,6.97 wt%,and 0.13 wt%,*** thiosulfate was used for gold extraction from the biooxidation residue of the refractory gold *** results showed that the optimal reagent conditions were 0.18 M thiosulfate,0.02 M copper(II),1.0 M ammonia,and 0.24 M *** these conditions,a maximum gold leaching efficiency of 85.05%was obtained.

关键词： thiosulfate leaching gold biooxidation refractory gold concentrate process mineralogy

Effect of titanium content on the refinement of coarse columnar austenite grains during the solidification of peritectic steel

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International Journal of Minerals,metallurgy and Materials 2022年第12期29卷 2172-2180页

作者： Jiazhi An Zhaozhen Cai Miaoyong Zhu key laboratory for ecological metallurgy of Multimetallic Mineral(ministry of education) Northeastern UniversityShenyang 110819China School of metallurgy Northeastern UniversityShenyang 110819China

The effect of titanium content on the refinement of austenite grain size in as-cast peritectic carbon steel was investigated by fast directional solidification experiments with simulating the solidification and growth of surface and subsurface austenite in continuously cast *** electron microscope(TEM)and scanning electron microscope(SEM)were used to analyze the size and distribution of Ti(C,N)precipitates during *** on these results,the pinning pressure of Ti(C,N)precipitates on the growth of coarse columnar grains(CCGs)was *** results show that the austenite microstructure of as-cast peritectic carbon steel is mainly composed of the regions of CCGs and fine columnar grains(FCGs).Increasing the content of titanium reduces the region and the short axis of the *** the content of titanium is 0.09wt%,there is no CCG *** microscale particles will firstly form in the liquid,which will decrease the transition temperature from FCGs to *** chain-like nanoscale Ti(C,N)will precipitate with the decrease of the transition ***,calculations shows that the refinement of the CCGs is caused by the pinning effect of Ti(C,N)precipitates.

关键词： peritectic steel grain refinement coarse columnar grain titanium carbonitride pinning pressure

Extraction of Valuable Metals from Titanium-bearing Blast Furnace Slag by Acid Leaching

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 376-385页

作者：刘燕 CHEN Xuegui MAO Shuaidong XIAO Yadong LI Jiacong School of metallurgy Northeastern UniversityShenyang 110819China key laboratory of ecological metallurgy of Multi-metal Intergrown Ores of ministry of education Shenyang 110819China

To realize the resource utilization of the valuable metals in the titanium-containing blast furnace slag,the process route of “hydrochloric acid leaching-electrolysis-carbonization and carbon dioxide capture-preparation of calcium carbonate” was *** this study,the influences of process conditions on the leaching rates of calcium,magnesium,aluminum,and iron and the phases of the leaching residue were investigated for the leaching *** experimental results show that the HCl solution could selectively leach the elements from the titanium-containing blast furnace *** better leaching conditions are the HCl solution concentration of 4 mol/L,the leaching time of 30 min,the ratio of liquid volume to solid gas of 10 mL/g,and the stirring paddle speed of 300 r/*** the conditions,the leaching rates of calcium,magnesium,aluminum,and iron can reach 85.87%,73.41%,81.35%,and 59.08%,and the leaching rate of titanium is 10.71%.The iron and the aluminum are removed from the leachate to obtain iron-aluminum water purification agents,and the magnesium is removed from the leachate to obtain magnesium *** leaching residue phase is dominated by perovskite,followed by magnesium silicate and tricalcium aluminate,and the titaniumrich material could be obtained from the leaching residue by desiliconization.

关键词： titanium-containing blast furnace slag acid leaching valuable metals comprehensive utilization