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Inhibition of jarosite heterogeneous crystallization on anglesite via in-situ formation of competitive substrate

Journal of Environmental Sciences 2025年第3期149卷 394-405页

作者： Jiahui Wu Xu Yan Feiping Zhao Yong Ke Haiying Wang Wenchao Zhang Qingwei Wang Meiqing Shi Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China State Key Laboratory of Advanced Metallurgy for non-ferrous metals Changsha 410083China

Heterogeneous crystallization is a common occurrence during the formation of *** leads to the encapsulation of valuable/hazardous metals within the primary phase,presenting significant challenges for waste treatment andmetal ***,we proposed a novel method involving the in-situ formation of a competitive substrate during the precipitation of jarosite waste,which is an essential process for removing iron in zinc *** observed that the in-situ-formed competitive substrate effectively inhibits the heterogeneous crystallization of jarosite on the surface of anglesite,a lead-rich phase present in the *** a result,the iron content on the anglesite surface decreases from34.8%to 1.65%.The competitive substrate was identified as schwertmannite,characterized by its loose structure and large surface ***,we have elucidated a novel mechanism underlying this inhibition of heterogeneous crystallization,which involves the local supersaturation of jarosite caused by the release of ferric and sulfate ions from the competitive *** local supersaturation promotes the preferential heterogeneous crystallization of jarosite on the competitive ***,during the formation of jarosite,the competitive substrate gradually vanished through a dissolution-recrystallization process following the Ostwald rule,where a metastable phase slowly transitions to a stable *** effectively precluded the introduction of impurities and reduced waste *** goal of this study is to provide fresh insights into the mechanism of heterogeneous crystallization control,and to offer practical crystallization strategies conducive to metal separation and recovery from solid waste in industries.

关键词： Heterogeneous crystallization Jarosite waste Competitive substrate Zinc hydrometallurgy

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Flow behavior and dynamic softening mechanism of Pt−10Ir precious alloy

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Transactions of nonferrous metals Society of China 2025年第1期35卷 225-242页

作者： Xin-pei ZHANG Jun-jie HE Lin PI Quan FU Wen-yan ZHOU Jun CHENG Sheng-wen BAI Xuan ZHOU Yi LIU Yong MAO Materials Genome institute School of Materials and EnergyYunnan UniversityKunming 650091China Kunming Precious Materials&Technology Co. Ltd.Yunnan Precious Metals Laboratory Co.Ltd.Sino-Platinum Metals Co.Ltd.Kunming 650106China Kunming institute of Precious metals Kunming 650106China State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum metals Sino-Platinum Metals Co.Ltd.Kunming 650106China Shaanxi Key Laboratory of Biomedical Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The hot deformation behavior of Pt−10Ir alloy was studied under a wide range of deformation *** a low deformation temperature(950−1150℃),the softening mechanism is primarily dynamic *** addition,dynamic recrystallization by progressive lattice rotation near grain boundaries(DRX by LRGBs)and microshear bands assisted dynamic recrystallization(MSBs assisted DRX)coordinate the ***,it is difficult for the dynamic softening to offset the stain hardening due to a limited amount of DRXed *** a high deformation temperature(1250−1350℃),three main DRX mechanisms associated with strain rates occur:DRX by LRGBs,DRX by a homogeneous increase in misorientation(HIM)and geometric DRX(GDRX).With increasing strain,DRX by LRGBs is enhanced gradually under high strain rates;the“pinch-off”effect is enhanced at low strain rates,which was conducive to the formation of a uniform and fine microstructure.

关键词： platinum alloy hot deformation microstructure evolution dynamic recovery dynamic recrystallization

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Microstructure evolution of 7050 aluminum alloy during hot deformation

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Transactions of nonferrous metals Society of China 2010年第2期20卷 189-194页

作者：李俊鹏沈健闫晓东毛柏平闫亮明 general research institute for non-ferrous metals

Hot compression of 7050 aluminum alloy was performed on Gleeble 1500D thermo-mechanical simulator at 350 ℃ and 450 ℃ with a constant strain rate of 0.1 s-1 to different nominal strains of 0.1, 0.3 and 0.7. Microstructures of 7050 alloy under various compression conditions were observed by TEM to investigate the microstructure evolution process of the alloy deformed at various temperatures. The microstructure evolves from dislocation tangles to cell structure and subgrain structure when being deformed at 350 ℃, of which dynamic recovery is the softening mechanism. However, continuous dynamic recrystallization (DRX) occurs during hot deformation at 450 ℃, in which the main nucleation mechanisms of DRX are subgrain growth and subgrain coalescence rather than particle-simulated nucleation (PSN).

关键词： microstructure evolution dynamic recovery dynamic recrystallization hot deformation 7050 alloy

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Annulus electromagnetic stirring for preparing semisolid A357 aluminum alloy slurry

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中国有色金属学会会刊：英文版 2009年第5期19卷 1104-1109页

作者：白月龙徐骏张志峰石力开 general research institute for non-ferrous metals

The effects of pouring temperature and annulus gap width on the microstructure of the semi-solid A357 aluminum alloy slurry prepared by annulus electromagnetic stirring(AEMS)technology were *** results show that low pouring temperature and narrow annulus gap are advantageous to obtaining the small spherical primaryα(Al)*** lower the pouring temperature is and the smaller the annulus gap width is,the more uniform,the smaller and the more spherical the microstructure is. The microstructures obtained by the ordinary electromagnetic stirring and AEMS were *** results indicate that the primaryα(Al)particles are globular,small and distribute homogeneously in the slurry obtained by *** in the slurry obtained by the ordinary electromagnetic stirring,the primaryα(Al)particles are small dendrites in the edge of the slurry and they are large and rosette-like or dendritic in the inner of the slurry.

关键词：电磁搅拌制备温度金浆料半固态铝环形浇注温度水泥浆

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Preparation of semi-solid slurry at power frequency by annulus electromagnetic stirring method

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中国有色金属学会会刊：英文版 2009年第S3期19卷 531-536页

作者：白月龙徐骏张志峰石力开 general research institute for non ferrous metals

The effect of stirring frequency on the semi-solid A357 aluminum alloy microstructure was investigated by annulus electromagnetic stirring(AEMS) method. The microstructures obtained by AEMS method and ordinary electromagnetic stirring(EMS)method were compared and analyzed. The results show that the primary α(Al) particles become more spherical and fine, and disperse uniformly in a liquid matrix with increasing stirring frequency, and higher stirring frequency is advantageous to obtain the fine spherical semi-solid microstructure by AEMS. Compared with the microstructures obtained at stirring frequency of 50 Hz in EMS, the fine spherical and uniformly distributed semi-solid microstructures can be still obtained at stirring frequency of 50 Hz in AEMS, so stirring frequency of 50 Hz is recommended in AEMS to save investment cost on frequency-conversion facilities.

关键词： A357 aluminum alloy semi-solid electromagnetic stirring slurry preparation

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Hot workability of Mg-9Y-1MM-0.6Zr alloy

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Journal of Rare Earths 2011年第5期29卷 460-465页

作者：马鸣龙何兰强李兴刚李永军张奎 State Key Lab of non-ferrous metals and Processes General Research Institute for Non-Ferrous Metals

The behavior evolvement of Mg-9Y-1MM-0.6Zr （WE91） alloy during hot deformation process was discussed. The flow stress behavior of magnesium alloy over the strain rate range of 0.001 to 1 s–1 and the temperature range of 653 to 773 K was studied on a Gleeble-1500D hot simulator under the maximum deformation degree of 60%. The experimental results showed that the relationship between stress and strain was obviously affected by the strain rate and deformation temperature and the flow curves observed were typical of the occurrence of dynamic recrystallization. The flow stress of WE91 magnesium alloy during high temperature deformation could be represented by the Zener-Hollomon parameter in the hyperbolic Arrhenius-type equation. The average deformation activation energy Q and strain coefficient n were 224.11 kJ/mol and 3.08 by calculation,respectively. The processing maps were calculated and analyzed according to the dynamic materials model. The map at strain of 0.916 exhibited three domains with peak efficiency of 49%,44% and 42%,respectively. It was found that the alloy could be extruded at 693 K with mechanical properties of σ0.2=240 MPa,σb=315 MPa and δ=15.5%.

关键词： rare-earth magnesium alloy plastic behavior processing map microstructures

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Influence of Procedure Parameters on Rheological Property of Semi-Solid AZ91D Magnesium Alloy

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Journal of Rare Earths 2004年第z2期22卷 47-49页

作者： Jiang Yunxi Xie Shuisheng Li Xinggang Li Lei general research institute for non-ferrous metals Beijing 100088China General Research Institute for Non-Ferrous MetalsBeijing 100088China General Research Institute for Non-Ferrous MetalsBeijing 100088China General Research Institute for Non-Ferrous MetalsBeijing 100088China

Semi-solid AZ91D magnesium alloy was investigated in isothermal steady-state condition. The influence of stirring technological parameters such as stirring temperature and shear rate to apparent viscosity of semi-solid alloy slurry was discussed. Apparent viscosity increases with stirring temperature decreases at the same shear rate. At the same stirring temperature, apparent viscosity decreases rapidly at first with shear rate increases, and then apparent viscosity decreases slowly with shear rate increases, when shear rate reaches a certain value, apparent viscosity appears tiny increase. According to the experimental data, the relation between solid volume fraction and apparent viscosity of semi-solid AZ9l D alloy at shear rate 238 s- 1 is fitted by regression method, it supplies useful data to the numerical simulation of semi-solid AZ91D alloy die casting process.

关键词： AZ91D alloy semi-solid rheological property procedure parameter

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Numerical Study of Scale Effects of Ultra-Thin Nickel Beams

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Journal of Rare Earths 2004年第z2期22卷 170-173页

作者： Li Lei Xie Shuisheng Yang Haoqiang Huang Guojie general research institute for non-ferrous metals Beijing 100088China General Research Institute for Non-Ferrous MetalsBeijing 100088China General Research Institute for Non-Ferrous MetalsBeijing 100088China General Research Institute for Non-Ferrous MetalsBeijing 100088China

Recent experiments have shown that metallic materials display significant size effects when the characteristic length scale of non-uniform plastic deformation is close to a micron. Couple stress plasticity has been developed to explain such phenomena by Fleck and Hutchinson. The mechanical behaviors of ultra-thin nickel beams in different boundary conditions were studied with the hybrid element developed for couple stress plasticity before. Strong scale effects are found when the beam's thickness is close to the material characteristic length scale. Such phenomena will disappear if the beam' s thickness is greatly larger than the material characteristic length scale. The scale effect is the beams inherent property and it does not change with the change of support conditions.

关键词： scale effect MEMS couple stress plasticity hybrid element

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Effect of high shear rate on solidification microstructure of semisolid AZ91D alloy

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中国有色金属学会会刊：英文版 2010年第S3期20卷 868-872页

作者：朱光磊徐骏张志峰刘国钧 general research institute for non-ferrous metals

To investigate the effects of rotation speed and shearing time on morphology of semisolid AZ91D alloy,experimental work was undertaken using a twin-screw slurry *** results show that increasing the rotation speed and reasonable time can give rise to substantial grain refinement during continuous shearing stage,which can be attributed to the increasing of effective nucleation rate caused by the extremely uniform temperature due to high shear rate and high degree of *** with low rotation speed at the same thermal condition,the analysis indicates that the microstructures obtained at high rotation speed are homogenous spherical and fine grains instead of dendritic or rosette and exhibits uniform distribution in the eutectic matrix.

关键词： semisolid high shear rate solidification AZ91D rotation speed

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Effect of lanthanum addition on microstructure and corrosion behavior of Al-Sn-Bi anodes

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Journal of Rare Earths 2011年第2期29卷 129-132页

作者：侯德龙李德富韩莉纪连芹 general research institute for non-ferrous metals

Novel Al-Sn-Bi anodes with and without lanthanum （La） were *** evaluate the corrosion properties of the anodes,constant current and dynamic loop tests were carried out to determine its efficiency and corrosion *** microscopy （OM）,transmission electron microscopy （TEM） and energy spectrum analysis techniques were used to examine and analyze microstructure and corrosion behavior of the *** result showed that the Al-Sn-Bi anodes with La additions revealed higher current efficiency and anticorrosion in artificial *** phase of anodes with La additions got more homogenous than that without La *** grains were fined and the amount of segregation Fe-phase was reduced.

关键词： Al-Sn-Bi sacrificial anodes lanthanum microstructure comprehensive property rare earths

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