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Selective separation of iron and scandium from Bayer Sc-bearing red mud

Journal of Rare Earths 2023年第7期41卷 1099-1107,I0005页

作者： Junhui Xiao Kai Zou Nanlan Zhong Deqiang Gao Sichuan Provincial Engineering Lab of Nonmetallic Mineral Powder Modification and High-Value Utilization Southwest University of Science and TechnologyMianyang 621010China Dongfang Boiler Group Co. Ltd.Zigong 643001China Key Laboratory of Ministry of Education for Solid Waste Treatment and Resource Recycle Southwest University of Science and TechnologyMianyang 621010China

In this study,we investigated the separation of iron and scandium from Sc-bearing red mud.The red mud object of our study contained 31.11 wt%total iron(TFe),0.0045 wt%Sc,hematite(Fe_(2)O_(3))and ferrosilite(FeO·SiO_(2))as the main Fe-bearing minerals.The Sc-bearing red mud was treated by a novel deep reduction roasting and magnetic separation process that includes the addition of coke and CaO to extract Fe and enriching Sc from the Sc-bearing red mud.The addition of coke and CaO enhances the transformation of hematite(Fe_(2)O_(3))to metallic iron(Fe~0)and magnetite(Fe_(3)O_(4))as well as the transformation of ferrosilite into metallic iron(Fe~0).The test results show that utilizing the new process a Fe concentrate with a TFe content of 81.22 wt%and Fe recovery of 92.96%was obtained.Furthermore,magnetic separation tailings with Sc content of 0.0062 wt%and Sc recovery of 98.65%were also obtained.The test results were achieved under the following process conditions:roasting temperature of 1373 K,roasting time of 45 min,calcium oxide dosage of 20 wt%,coke dosage of 25 wt%,grinding fineness of90%<0.04 mm,and magnetic field intensity of 0.24 T.The major minerals in the Fe concentrate are metallic iron(Fe~0)and magnetite(Fe_(3)O_(4)).The main minerals in the magnetic separation tailings with a low TFe content of 2.62%are CaO·SiO_(2),Na_(2)O·SiO_(2),FeO·SiO_(2),Ca_(3)Fe_(2)Si_(3)O_(12),CaAl_(2)SiO_6 and CaFe(SiO_(3))_(2).

关键词： Red mud Scandium Iron Deep reduction roasting Magnetic separation Rare earths

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Methanolysis of amides under high-temperature and high-pressure conditions with a continuous tubular reactor

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Chinese Journal of Chemical Engineering 2023年第6期58卷 170-178页

作者： Pengcheng zou kai Wang The State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

The methanolysis of amides,which is widely employed in the synthetic organic chemistry,hardly occurs under mild conditions.To safely and controllably intensify the methanolysis reaction with hightemperature and high-pressure environment,a continuous tubular reaction technology is developed,whose space-time yield is over twice of that of the conventional batch reaction.The methanolysis of acetanilide is selected as the representative reaction,and the influences of temperature,pressure,reactant and catalyst concentration,and residence time on the reaction performances are systematically investigated.Taking the advantages of precise temperature and reaction time control by the tubular reactor,the kinetics of acetanilide methanolysis are determined and compared to the kinetics of acetanilide hydrolysis reaction.The tubular reaction method is also employed to test a variety of other amides to show the effects of substituents,steric hindrance,and alkalinity on the reaction rate of methanolysis.

关键词： Amide methanolysis reaction Flow chemistry Continuous reaction Process intensification

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Continuous deacylation of amides in a high-temperature and high-pressure microreactor

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Frontiers of Chemical Science and Engineering 2022年第12期16卷 1818-1825页

作者： Pengcheng zou kai Wang Guangsheng Luo State Key Lab of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

The deacylation of amides,which is widely employed in the pharmaceutical industry,is not a fast reaction under normal conditions.To intensify this reaction,a high-temperature and high-pressure continuous microreaction technology was developed,whose space-time yield was 49.4 times that of traditional batch reactions.Using the deacylation of acetanilide as a model reaction,the effects of the temperature,pressure,reaction time,molar ratio of reactants,and water composition on acetanilide conversion were carefully studied.Based on the rapid heating and cooling capabilities,the kinetics of acetanilide deacylation at high temperatures were investigated to determine the orders of reactants and activation energy.This microreaction technology was further applied to a variety of other amides to understand the influence of substituents and steric hindrance on the deacylation reaction.

关键词： amide deacylation microreactor flow chemistry reaction intensification

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Enhancement of silicon sub‑bandgap photodetection by helium‑ion implantation

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Frontiers of Optoelectronics 2023年第4期16卷 101-108页

作者： Zhao Wang Xiaolei Wen Kai Zou Yun Meng Jinwei Zeng Jian Wang Huan Hu Xiaolong Hu School of Precision Instrument and Optoelectronic Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Optoelectronic Information Science and Technology Ministry of EducationTianjin 300072China Center for Micro and Nanoscale Research and Fabrication University of Science and Technology of ChinaHefei 230026China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Optics Valley Laboratory Wuhan 430074China ZJUI Institute International CampusZhejiang UniversityHaining 311400China State Key Laboratory of Fluidic Power&Mechanical Systems Zhejiang UniversityHangzhou 310027China

Silicon sub-bandgap photodetectors can detect light at the infrared telecommunication wavelengths but with relatively weak photo-response.In this work,we demonstrate the enhancement of sub-bandgap photodetection in silicon by helium-ion implantation,without afecting the transparency that is an important benefcial feature of this type of photodetectors.With an implantation dose of 1×10^(13)ions/cm^(2),the minimal detectable optical power can be improved from−33.2 to−63.1 dBm,or,by 29.9 dB,at the wavelength of 1550 nm,and the photo-response at the same optical power(−10 dBm)can be enhanced by approximately 18.8 dB.Our work provides a method for strategically modifying the intrinsic trade-of between transparency and strong photo-responses of this type of photodetectors.

关键词： Sub-bandgap optical absorption Helium-ion implantation Silicon photodetector Non-invasive photodetection

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Comprehensive learning pigeon-inspired optimization with tabu list

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Science China(Information Sciences) 2019年第7期62卷 99-101页

作者： Shang XIANG Lining XING Ling WANG Kai Zou College of Systems Engineering National University of Defense Technology College of Engineering Shanghai Polytechnic University Department of Automation Tsinghua University School of Public Administration Xiangtan University

Dear editor,During the last decade, population-based algorithms have been extensively used to solve multimodal, discontinuous, non-convex, and nondifferentiable optimization problems. These algorithms search for the best solution by applying some operators and strategies over a set (population) of potential solutions (individuals). All those operators or strategies follow one principle:balancing

关键词： pro Comprehensive learning pigeon-inspired optimization with tabu list

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Efficacy and moderating factors of the Early Start Denver Model in Chinese toddlers with autism spectrum disorder:a longitudinal study

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世界儿科杂志:英文版 2023年第8期19卷 741-752页

作者： Shi-Huan Wang Hai-Tao Zhang Yuan-Yuan zou San-Mei Cheng Xiao-Bing zou kai-Yun Chen Child Developmental and Behavioral Center The Third Affiliated Hospital of Sun Yat-sen UniversityNo.600Tianhe RoadGuangzhou510630China

Background Several studies have shown the effectiveness of the Early Start Denver Model(ESDM),but few studies have explored the long-term efficacy of ESDM.This study aimed to explore the efficacy and moderating factors of ESDM in Chinese toddlers with autism spectrum disorder(ASD)in a longitudinal way.Methods A total of 60 toddlers with ASD were recruited and randomly divided into two groups:ESDM group all received 24 weeks intervention;Control group were waiting for intervention.Baseline assessment(T0)was conducted before intervention,including Gesell Developmental Scale(GDS)and Psycho-educational Profile-3rd Edition(PEP-3).All toddlers with ASD were examined in the first assessment(T1)at 6 months and in the second assessment(T2)at 12 months.Results In T1 assessment,the increments in speech and personal communication development quotient in GDS were significantly larger in the ESDM group than in the control group(P=0.010,0.047).In T2 assessment,the ESDM group had higher elevation in cognitive verbal/preverbal(CVP),social reciprocity and characteristic verbal behaviors assessed by PEP-3(P=0.021,0.046,0.014).In addition,the severity of stereotyped behavior was negatively associated with improvement in CVP.Family income was positively associated with improvement in speech and CVP(all P<0.05).Conclusions ESDM can effectively improve speech and communication in toddlers with ASD after 24-week intervention.More importantly,ESDM can promote cognition and social interaction and can reduce stereotyped verbal behavior in toddlers with ASD in longitudinal observation.The severity of stereotyped behavior and family ecological factors may be considered as affecting the efficacy of ESDM.

关键词： Autism spectrum disorder Efficacy Early Start Denver Model Longitudinal Moderating factors Stereotyped behavior

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The long non-coding RNA PILNCR2 increases low phosphate tolerance in maize by interfering with miRNA399-guided cleavage of ZmPHT1s

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Molecular Plant 2023年第7期16卷 1146-1159页

作者： Yafei Wang Zhonghua Wang Qingguo Du kai Wang Chunqin zou Wen-Xue Li National Engineering Laboratory for Crop Molecular Breeding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China College of Resources and Environmental Sciences National Academy of Agriculture Green DevelopmentKey Laboratory of Plant-Soil InteractionsMinistry of EducationChina Agricultural UniversityBeijing100193China

Theopen reading regions of ZmPHT1s(inorganic phosphate[Pij transporters)inmaize possess target sites of microRNA399(miR399).However,the relationship between miR399 and ZmPHT1s and its functional importance in response to Pi deficiency remain to be explored.We show here that ZmPHT1;1,ZmPHT1;3,and ZmPHT1;13 are the targets of ZmmiRNA399.We found that a long non-coding RNA,PILNCR2(Pi-deficiency-induced IncRNA 2),is transcribed from the opposing DNA strand of ZmPHT1;1 and predominantly localized in the cytoplasm.A ribonuclease protection assay and an RNA-RNA binding assay showed that PILNCR2 and ZmPHT1s could form the RNA/RNA duplexes in vivo and in vitro.A co-expression assay in N.benthamiana revealed that the PILNCR2/ZmPHT1 RNA/RNA duplexes interfere with miR399-guided cleavage of ZmPHT1 mRNAs.Overexpression of PILNCR2 increased low-Pi tolerance in maize,whereas its knockout and knockdown decreased low-Pi tolerance in maize.Consistently,ZmPHT1;3 and ZmPHT1;13 mRNA abundance was increased in transgenic plants overexpressing PILNCR2 but reduced in its knock-out mutants,suggesting that PILNCR2 positively regulates the mRNA abundance of ZmPHT1;3 and ZmPHT1;13 in maize.Collectively,these results indicate that PILNCR2 plays an important role in maize Pihomeostasisby interfering with miRNA399-guided cleavageof ZmPHT1mRNAs.

关键词： long non-coding RNA miRNA RNA/RNA duplex post-transcriptional regulation maize

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Recent advances in organic pressure-responsive luminescent materials

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Chinese Chemical Letters 2019年第11期30卷 1883-1894页

作者： Zhiyuan Fu kai Wang Bo zou State Key Laboratory of Superhard Materials College of PhysicsJilin University

Organic luminescent materials are very sensitive to external stimuli,such as pressure,temperature,and electric field.The luminescent properties of some organic luminescent materials significantly change under high pressure.Some materials may show luminescence discoloration,whereas some may exhibit luminescence enhancement.These properties have many potential applications in anticounterfeiting,force sensor,data recording and storage,and luminescent devices,thereby greatly attracting the attention of scientists.In this review,the progress of research on these materials at high pressure in recent years is summarized.

关键词： Pressure-responsive Piezochromic Diamond anvil cell Pressure-induced enhanced emission Organic luminescent

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Electrochemical nitrate reduction to produce ammonia integrated into wastewater treatment:Investigations and challenges

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Chinese Chemical Letters 2023年第6期34卷 26-36页

作者： Xinyi zou Jiawei Xie Changhong Wang Guangming Jiang kai Tang Chongjun Chen School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215011China Engineering Research Center for Waste Oil Recovery Technology and Equipment Ministry of EducationChongqing Technology and Business UniversityChongqing 400067China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou 215009China Tianping College of Suzhou University of Science and Technology Suzhou 215009China

Nitrate(NO_(3)^(-))is widely found in wastewater,which is harmful to human health and water environmental.Electrochemical reduction can convert NO_(3)^(-)to high value-added ammonia(NH)3)/ammonium(NH_(4)^(+))for pollutant removal and resource recovery.Currently,electrochemical nitrate reduction to produce ammonia(ENRA)is mostly focused on the preparation of high-performance catalysts,while ignoring the prerequisite for industrial application as the stable operation and optimal regulation of the process.Therefore,the review focused on wastewater treatment,based on the mechanism of electrochemical nitrate reduction for ammonia production and reactor construction(reactor,power supply system),then summarized the operation control strategies(such as reduction potential,nitrate concentration,inorganic ions,p H)that should be noted for ENRA.Finally,the challenges(system structure,economy)and prospects(ammonia recovery process,construction of large-scale ENRA system,application of real wastewater)of the field as it moves towards commercialization were discussed.It is hoped that this review will facilitate the scaling up of ENRA in the wastewater treatment field.

关键词： Electrochemistry Nitrate reduction Ammonia production Control strategy

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Thermal decomposition mechanism of low-content-fluorite Bayan Obo rare earth concentrate roasted with sodium carbonate and its consequent separation study

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Journal of Rare Earths 2020年第9期38卷 994-1002,I0003页

作者： Dan zou Ji Chen Jiashi Hu kai Li Deqian Li State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China

Thermal decomposition and phase transformation for the mixture of Bayan Obo rare earth concentrate(BORC)and sodium carbonate(Na2CO3)roasted at different temperatures with weight ratio of 100:20 were studied in detail in our study.The aim of our study is to reveal the nature of roasting reaction between BORC and Na2CO3 and thus providing a new method for processing BORC.The results indicate that BORC can be decomposed completely with Na2CO3 at around 600℃after 3 h.During the calcination process,Ce0.5Nd0.5O1.75,NaF,Na3PO4,and a rare earth double phosphate phase Na3RE(PO4)2 are formed after the decomposition of BORC with Na2CO3.In addition,the thermal decomposition mechanism is determined in the paper.Based on these facts,a clean technique processing BORC was developed.And a CeF3 powder,whose composition was measured and stability was also evaluated,was obtained for some potential application from the new technique.This research is of significance in terms of the Na2CO3-roasting BORC solid reaction study and sheds a light on a potential clean technique for BORC.

关键词： Thermal decomposition mechanism Bayan Obo RE concentrate Na2CO3 Technique CeF3 Rare earths

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