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Comprehensive recovery of lead, zinc, and iron from hazardous jarosite residues using direct reduction followed by magnetic separation 被引量:4
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作者 Ya-yun Wang Hui-fen Yang +2 位作者 Bo Jiang Rong-long Song Wei-hao Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第2期123-130,共8页
Lead, zinc, and iron were recovered from jarosite residues using direct reduction followed by magnetic separation. The influence of the coal dosage, reduction temperature, and reduction time on the volatilization rate... Lead, zinc, and iron were recovered from jarosite residues using direct reduction followed by magnetic separation. The influence of the coal dosage, reduction temperature, and reduction time on the volatilization rates of lead and zinc and the metallization rate of iron were investigated. The results show that the volatilization rates of lead and zinc were 96.97% and 99.89%, respectively, and the iron metallization rate was 91.97% under the optimal reduction roasting conditions of a coal dosage of 25.0 wt% and reduction roasting at 1250°C for 60 min. The magnetic concentrate with an iron content of 90.59 wt% and an iron recovery rate of 50.87% was obtained under the optimum conditions in which 96.56% of the reduction product particles were smaller than 37 μm and the magnetic field strength was 24 k A/m. Therefore, the results of this study demonstrate that recovering valuable metals such as lead, zinc, and iron from jarosite residues is feasible using the developed approach. 展开更多
关键词 jarosite residues recovery direct reduction magnetic separation valuable metals
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A method for recovery of iron,titanium,and vanadium from vanadium-bearing titanomagnetite 被引量:13
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作者 Yi-min Zhang Li-na Wang +4 位作者 De-sheng Chen Wei-jing Wang Ya-hui Liu Hong-xin Zhao Tao Qi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第2期131-144,共14页
An innovative method for recovering valuable elements from vanadium-bearing titanomagnetite is proposed. This method involves two procedures: low-temperature roasting of vanadium-bearing titanomagnetite and water lea... An innovative method for recovering valuable elements from vanadium-bearing titanomagnetite is proposed. This method involves two procedures: low-temperature roasting of vanadium-bearing titanomagnetite and water leaching of roasting slag. During the roasting process, the reduction of iron oxides to metallic iron, the sodium oxidation of vanadium oxides to water-soluble sodium vanadate, and the smelting separation of metallic iron and slag were accomplished simultaneously. Optimal roasting conditions for iron/slag separation were achieved with a mixture thickness of 42.5 mm, a roasting temperature of 1200°C, a residence time of 2 h, a molar ratio of C/O of 1.7, and a sodium carbonate addition of 70 wt%, as well as with the use of anthracite as a reductant. Under the optimal conditions, 93.67% iron from the raw ore was recovered in the form of iron nugget with 95.44% iron grade. After a water leaching process, 85.61% of the vanadium from the roasting slag was leached, confirming the sodium oxidation of most of the vanadium oxides to water-soluble sodium vanadate during the roasting process. The total recoveries of iron, vanadium, and titanium were 93.67%, 72.68%, and 99.72%, respectively. 展开更多
关键词 recovery vanadium titanomagnetite direct reduction sodium oxidation smelting separation water leaching
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Supergravity separation of Pb and Sn from waste printed circuit boards at different temperatures 被引量:4
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作者 Long Meng Zhe Wang +2 位作者 Yi-wei Zhong Kui-yuan Chen Zhan-cheng Guo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第2期173-180,共8页
Printed circuit boards(PCBs) contain many toxic substances as well as valuable metals, e.g., lead(Pb) and tin(Sn). In this study, a novel technology, named supergravity, was used to separate different mass ratio... Printed circuit boards(PCBs) contain many toxic substances as well as valuable metals, e.g., lead(Pb) and tin(Sn). In this study, a novel technology, named supergravity, was used to separate different mass ratios of Pb and Sn from Pb–Sn alloys in PCBs. In a supergravity field, the liquid metal phase can permeate from solid particles. Hence, temperatures of 200, 280, and 400°C were chosen to separate Pb and Sn from PCBs. The results depicted that gravity coefficient only affected the recovery rates of Pb and Sn, whereas it had little effect on the mass ratios of Pb and Sn in the obtained alloys. With an increase in gravity coefficient, the recovery values of Pb and Sn in each step of the separation process increased. In the single-step separation process, the mass ratios of Pb and Sn in Pb–Sn alloys were 0.55, 0.40, and 0.64 at 200, 280, and 400°C, respectively. In the two-step separation process, the mass ratios were 0.12 and 0.55 at 280 and 400°C, respectively. Further, the mass ratio was observed to be 0.76 at 400°C in the three-step separation process. This process provides an innovative approach to the recycling mechanism of Pb and Sn from PCBs. 展开更多
关键词 printed circuit boards supergravity separation recovery Pb–Sn alloy gravity coefficient
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Status quo on recycling of waste crystalline silicon for photovoltaic modules and its implications for China's photovoltaic industry
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作者 Yichen Zhou Jia Wen +3 位作者 Yulin Zheng Wei Yang Yuru Zhang Wenxing Cheng 《Frontiers in Energy》 SCIE EI CSCD 2024年第5期685-698,共14页
As a clean and efficient renewable energy source,solar energy has been rapidly applied worldwide.The growth rate of China's installed capacity ranks first in the world.However,the life span of photovoltaic(PV)modu... As a clean and efficient renewable energy source,solar energy has been rapidly applied worldwide.The growth rate of China's installed capacity ranks first in the world.However,the life span of photovoltaic(PV)modules is 25 to 30 years,and the rapid development of installed capacity indicates that a large number of PV modules will be decommissioned in the future.Therefore,the ongoing treatment of the scrapped PV waste cells in the near future requires urgent plans and countermeasures.Proper recycling and disposal of decommissioned PV modules is a practical requirement for the sustainable development of the country and industry.Crystalline silicon(c-Si)solar cells currently occupy 85%-90%of the market share,and some scholars have begun to seek the utilization pathways of the waste Si in and outside the PV industry.In this paper,the research status of the separation and recycling process of crystalline Si PV modules is reviewed,and the recycling ways of crystalline silicon are particularly focused on.In addition,the current bottlenecks in the PV recycling industry in China are analyzed and some suggestions on the sustainable development of the PV industry are proposed. 展开更多
关键词 waste photovoltaic(PV)modules crystalline silicon(c-Si)battery separation and recovery sustainable development
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Optimization of magnetic separation process for iron recovery from steel slag 被引量:3
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作者 Yuan-pei Lan Qing-cai Liu +2 位作者 Fei Meng De-liang Niu Heng Zhao 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第2期165-170,共6页
To improve the efficiency of iron recovery from steel slag and reduce the wear-and-tear on facilities, a new method was proposed by adding a secondary screen sizer to the magnetic separation process according to grain... To improve the efficiency of iron recovery from steel slag and reduce the wear-and-tear on facilities, a new method was proposed by adding a secondary screen sizer to the magnetic separation process according to grain size distribution of magnetic iron (M-Fe) in the slag. The final recycling efficiency was evaluated by calculating the percentage of recycled M-Fe to the maximum amount of M-Fe that could be recovered. Three types of slags, namely basic oxygen furnace slag, desul- furization slag, and iron ladle slag, were studied, and the results showed that the optimized re- covery efficieneies were 93.20%, 92. 48%, and 85.82% respectively, and the recycling efficien eies were improved by 9.58%, 7.11%, and 6.24% respectively. Furthermore, the abrasion between the mill equipment and the remaining slags was significantly reduced owing to the efficient recovery of larger M-Fe particles. In addition, the using amount of grinding balls was reduced by 0. 46 kg when every 1 t steel slag was processed. 展开更多
关键词 Steel slag Magnetic separation Iron recovery recovery efficiency Abrasion
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Iron recovery and rare earths enrichment from Bayan Obo tailings using Coal-Ca(OH)2-NaOH roasting followed by magnetic separation 被引量:7
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作者 Qiang Zheng Xue Bian Wen-yuan Wu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第2期147-155,共9页
The recovery of iron and enrichment of rare earths from Bayan Obo railings were investigated using Coal Ca(OH) 2 NaOH roasting followed by magnetic separation. The influences of roasting temperature, roasting time, ... The recovery of iron and enrichment of rare earths from Bayan Obo railings were investigated using Coal Ca(OH) 2 NaOH roasting followed by magnetic separation. The influences of roasting temperature, roasting time, coal content, milling time, Ca(OH)2 dosage and NaOH dosage on the iron and rare earths recovery were explored. The results showed that the magnetic concentrate containing 70.01 wt. % Fe with the iron recovery of 94.34G and the tailings of magnetic separation containing 11.46 wt. % rare earth oxides (REO) with the REO recovery of 98. 19% were obtained under the optimum conditions (i. e. , roasting temperature of 650℃, roasting time of 60 min, coal content of 2.0%, milling time of 5 min, and NaOH dosage of 2.0%). The Ca(OH)2 dosage had no effect on the separation of iron and rare earths. According to the mineralogical and morphologic analysis, the iron and rare earths of Bayan Obo tailings could be utilized in subsequent ironmaking process and hydrometallurgy process. 展开更多
关键词 Bayan Obo tailing Iron recovery Rare earth enrichment Roasting Magnetic separation
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Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate 被引量:2
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作者 Yu-bao Liu Zhi-hong Zhang +3 位作者 Er-xiong Zhao Xian-heng Zhang Xiao-qing Wang Guo-hua Chen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第7期691-696,共6页
The pre-reduced Bayan Obo ferroniobium(FeNb)ore concentrate block was taken as raw materials for studying the physical properties of niobium-enriched slag and changes in niobium recovery rate.In addition,the dephosp... The pre-reduced Bayan Obo ferroniobium(FeNb)ore concentrate block was taken as raw materials for studying the physical properties of niobium-enriched slag and changes in niobium recovery rate.In addition,the dephosphorization rate of the slag under different melting-separation conditions was investigated using the melting-separation test.The research results demonstrate that(i)the niobium recovery rate and dephosphorization rate of the slag decrease with the increase in melting-separation temperature;(ii)the niobium recovery rate of the slag initially increases and then decreases with increase in basicity and time;and(iii)the dephosphorization rate of the slag increases with the increase in basicity and time.When the test was performed under the conditions of basicity of 0.6-0.7,time of 7-10min,and temperature of 1400-1450°C,the niobium recovery rate and dephosphorization rate are over 96%and 95%,respectively.By scanning electron microscopy,it is observed that niobium mainly exists in the form of calcium and titanium silicate within the slag phase,with uneven distribution. 展开更多
关键词 Melting separation Pre-reduced niobium ore concentrate Niobium-enriched slag Iron Dephosphorization rate Niobium recovery rate
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Gas-assisted magnetic separation for the purification of proteins in batch systems
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作者 Zhini Liu Liangrong Yang +6 位作者 Tingting Dong Wensong Li Xitong Sun Menghao Zhu Zhengkang Duan Qingfen Liu Huizhou Liu 《Particuology》 SCIE EI CAS CSCD 2016年第1期170-176,共7页
In this paper, gas-assisted magnetic separation (GAMS), a technique that combines magnetic separation with flotation, was investigated for the potential large-scale separation of proteins, The GAMS process includes ... In this paper, gas-assisted magnetic separation (GAMS), a technique that combines magnetic separation with flotation, was investigated for the potential large-scale separation of proteins, The GAMS process includes adsorption of target proteins and magnetic separation to recover protein-loaded magnetic particles from the dilute biosuspension with the assistance of bubbles, Microsized ethylenediamine- functionalized poly(glycidyl methacrylate) superparamagnetic microspheres (MPMs) and bovine serum albumin (BSA) were used as a model system. The feasibility of GAMS for capturing BSA-loaded MPMs from an appropriate medium was shown, High recovery of BSA-loaded MPMs was obtained by simple adjustment of the initial solution pH without extra detergents and antifoaming agents. The GAMS con- ditions were consistent with the adsorption conditions, and no proteins were desorbed from the MPMs during this process. Under the optimal conditions, the separation rate and recovery percentage reached 410 mL/min and 98% in 0.61 min, respectively. Conformational changes of BSA during the GAMS process were investigated by fluorescence spectroscopy and circular dichroism spectrometry, 展开更多
关键词 Adsorption Magnetic separation Flotation recovery BSA conformation
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