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| 1 | LOW-POWER LVDS I/O INTERFACE FOR ABOVE 2GB/S-PER-PIN OPERATION显示文摘Low Voltage Differential Signaling (LVDS) has become a popular choice for high-speed serial links to conquer the bandwidth bottleneck of intra-chip data transmission. This paper presents the design and the implementation of LVDS Input/Output (I/O) interface circuits in a standard 0.18 μm CMOS technology using thick gate oxide devices (3.3 V), fully compatible with LVDS standard. In the proposed transmitter, a novel Common-Mode FeedBack (CMFB)circuit is utilized to keep the common-mode output voltage stable over Process, supply Voltage and Temperature (PVT) variations. Because there are no area greedy resistors in the CMFB circuitry, the disadvantage of large die area in existing transmitter structures is avoided. To obtain sufficient gain, the receiver consists of three am- plifying stages: a voltage amplifying stage, a transconductance amplifying stage, and a transimpedance amplifying stage. And to exclude inner nodes with high RC time constant, shunt-shunt negative feedback is introduced in the receiver. A novel active inductor shunt peaking structure is used in the receiver to fulfill the stringent requirements of high speed and wide Common-Mode Input Region (CMIR) without voltage gain, power dissipation and silicon area penalty. Simulation results show that data rates of 2 Gbps and 2.5 Gbps are achieved for the transmitter and receiver with power con- sumption of 13.2 mW and 8.3 mW respectively. | Wang Xihu Wu Longsheng Liu Youbao | 2009 | Journal of Electronics(China)2009，26，4： | 3 |
| 2 | Simultaneous recovery of rare earth elements and phosphorus from phosphate rock by phosphoric acid leaching and selective precipitation:Towards green process显示文摘Phosphate rock has been considered as one of the potential promising resources for rare earth elements(REEs). But the cost issues and the technical challenges caused by the low content of REEs in ores did hinder the further development of REEs recovery technologies. In order to explore a green process for the recovery of REEs from phosphate rock, this study investigates the effects of phosphoric acid concentration, liquid-to-solid ratio(L/S ratio), leaching time and temperature on the leaching efficiencies of the major components from phosphate rock. A REEs recovery of 94.3% and a phosphorus recovery of 95.3%are achieved under the optimal conditions of attacking phosphate rock using 30%P_2 O_5 acid with an L/S ratio of 10:1 and a stirring speed of 250 r/min at 25 ℃ for 4 h. Then,the selective precipitation of REEs with 81.3% REEs recovery is realized by heating up the leaching solution from 25 to 90 ℃ and keeping for4 h. Thereafter, more than 95% phosphoric acid is recovered by H_2 SO_4 and high purity gypsum, more than95% CaSO_4(tested by XRF), is also produced at the same time. Ultimately, a green process that leaches phosphate rock with H_3 PO_4, selectively precipitates REEs from leaching solution by heating up, recovers H_3 PO_4 with H2 SO4 is proposed. Compared with REE recovery in traditional processes, this process owns the merits of simple operation, energy saving and minimum wastes. | Shengxi Wu Longsheng Zhao Liangshi Wang Xiaowei Huang Yunhan Zhang Zongyu Feng Dali Cui | 2019 | Journal of Rare Earths2019，37，6： | 2 |
| 3 | A radiation-hardened-by-design technique for suppressing SET in charge pump of PLL frequency synthesizer显示文摘This paper presents a single event transient(SET) suppressor circuit,which can suppress the effect of SET in charge pump(CP) on the whole PLL frequency synthesizers,and at the same time it brings little negative effect to the system during normal operation.Because the proposed SET suppressor circuit only includes a resistor,a PMOS and an NMOS device,little area penalty is introduced.By preventing SET propagating from CP to low pass filter(LPF) and VCO when a single event strikes on CP output node,the system shows excellent hardness to SET in CP.Mixed simulations are performed on TCAD workbench.The results show that a single event with an LET at 80 MeV cm 2 /mg can only induce approximately 2.3 mV disturbance on the control voltage of VCO. | HAN BenGuang GUO ZhongJie WANG XiHu WU LongSheng LIU YouBao | 2013 | Science China(Technological Sciences)2013，56，2： | 2 |
| 4 | Technology for recycling and regenerating graphite from spent lithium-ion batteries显示文摘With the annual increase in the amount of lithium-ion batteries(LIBs),the development of spent LIBs recycling technology has gradually attracted attention.Graphite is one of the most critical materials for LIBs,which is listed as a key energy source by many developed countries.However,it was neglected in spent LIBs recycling,leading to pollution of the environment and waste of resources.In this paper,the latest research progress for recycling of graphite from spent LIBs was summarized.Especially,the processes of pretreatment,graphite enrichment and purification,and materials regeneration for graphite recovery are introduced in details.Finally,the problems and opportunities of graphite recycling are raised. | Chenxing Yi Lijie Zhou Xiqing Wu Wei Sun Longsheng Yi Yue Yang | 2021 | Chinese Journal of Chemical Engineering2021，34，11： | 2 |
| 5 | One-step laser induced conversion of a gelatin-coated polyimide film into graphene:Tunable morphology,surface wettability and microsupercapacitor applications显示文摘Latest advances have witnessed the laser induction process on polyimide(PI)films for the formation of porous graphene.Herein,a fully converted graphene film was prepared by Nd:YAG laser scribing a gelatin coated PI film.It was found that the gelatin played the role of'shield'well in absorbing intense laser impact and benefit for the surface morphology modulation.Laser treatment lower than a critical fluence point of~4.00 J mm^(-2) contributed to a crater-like surface morphology due to the dispersed nature of Nd:YAG laser beam.By tuning laser fluence above the threshold,carbonized surface turned into continuous morphology.A fluid dynamics process accompanied by outgassing occurred during the carbonization,and the surface morphology gradually varied from stretched droplets to porous strips and finally to amorphous porous structures.The morphology evolution in combination with surface chemistry is responsible for the significant wettability transition from superhydrophobic to superhydrophilic,and a Janus superhydrophobic/superhydrophilic surface wettability was achieved under a laser fluence of~8.00 J mm^(-2).Eventually,microsupercapacitors(MSCs)were fabricated to show the great potential of our prepared graphene in flexible electronics. | WANG WenTao LU LongSheng XIE YingXi LI ZeHong WU WeiBin LIANG RongXuan TANG Yong | 2021 | Science China(Technological Sciences)2021，64，5： | 2 |
| 6 | Controlling the laser induction and cutting process on polyimide films for kirigami-inspired supercapacitor applications显示文摘The recently emerging laser-induced graphene(LIG)technology,with one-step processing and designable features,has been widely used in the fabrication of wearable/portable electronics.Herein,by taking inspiration from kirigami,we designed a stretchable supercapacitor(SC)step by step through controlling laser induction and cutting process on the polyimide(PI)film,with the use of one single CO_(2) laser source.Firstly,the carbonized basic geometric units of lines were produced on PI films to investigate the processing-structure relationships.Then,the complex photothermal conversion and heat transfer progress involved in the carbonized process were simulated by a photothermal model.Both experimental and theoretical results suggested that the laser power,scan rate and focus condition have great influence on the size,shape and morphology of the carbonized lines.Finally,we optimized the parameters of laser induction and cutting process to fabricate the kirigami-inspired SCs with reliable electrochemical properties and editable mechanical flexibility,showing great potential in the field of flexible electronics. | WANG WenTao LU LongSheng XIE YingXi WU WeiBin LIANG RongXuan LI ZeHong TANG Yong | 2021 | Science China(Technological Sciences)2021，64，3： | 2 |
| 7 | Chaos synchronization of semiconductor lasers over 1040-km fiber relay transmission with hybrid amplification显示文摘Optical chaos communication and key distribution have been extensively demonstrated with high-speed advantage but only within the metropolitan-area network range of which the transmission distance is restricted to around 300 km.For secure-transmission requirement of the backbone fiber link,the critical threshold is to realize long-reach chaos synchronization.Here,we propose and demonstrate a scheme of long-reach chaos synchronization using fiber relay transmission with hybrid amplification of an erbium-doped fiber amplifier(EDFA)and a distributed fiber Raman amplifier(DFRA).Experiments and simulations show that the hybrid amplification extends the chaos-fidelity transmission distance thanks to that the low-noise DFRA suppresses the amplified spontaneous emission noise and self-phase modulation.Optimizations of the hybrid-relay conditions are studied,including launching power,gain ratio of DFRA to EDFA,single-span fiber length,and number of fiber span.A 1040-km chaos synchronization with a synchronization coefficient beyond 0.90 is experimentally achieved,which underlies the backbone network-oriented optical chaos communication and key distribution. | LONGSHENG WANG JUNLI WANG YUSHAN WU YUEHUI SUN SONGSUI LI LIANSHAN YAN YUNCAI WANG ANBANG WANG | 2023 | Photonics Research2023，11，6： | 1 |
| 8 | An Improved Global Shutter Pixel with Extended Output Range and Linearity of Compensation for CMOS Image Sensor显示文摘An improved global shutter pixel structure with extended output range and linearity of compensation is proposed for CMOS image sensor. The potential switching of the sample and hold capacitor bottom plate outside the array is used to solve the problem of the serious swing limitation, which will attenuate the dynamic range of the image sensor. The non-linear problem caused by the substrate bias effect in the output process of the pixel source follower is solved by using the mirror FD point negative feedback self-establishment technology outside the array. The approach proposed in this paper has been verified in a global shutter CMOS image sensor with a scale of 1024×1024 pixels. The test results show that the output range is expanded from 0.95 V to 2 V, and the error introduced by the nonlinearity is sharply reduced from280 mV to 0.3 mV. Most importantly, the output range expansion circuit does not increase the additional pixel area and the power consumption. The power consumption of linearity correction circuit is only 23.1μW, accounting for less than 0.01% of the whole chip power consumption. | GUO Zhongjie YU Ningmei WU Longsheng | 2021 | Chinese Journal of Electronics2021，30，1： | 1 |
| 9 | Research on Column FPN and Black Level Calibration in Large Array CMOS Image Sensor显示文摘A technical investigation,research and implementation is presented to correct column fixed pattern noise and black level in large array Complementary metal oxide semiconductor(CMOS)image sensor.Through making a comparison among reported solution,and give large array CMOS image sensor design and considerations,according to our previous analysis on non-ideal factor and error source of piecewise Digital to analog converter(DAC)in multi-channels,an improving accurate piecewise DAC with adaptive switch technique is developed.The research theory has verified by a high dynamic range and low column Fixed pattern noise(FPN)CMOS image sensor prototype chip,which consisting of 8320×8320 pixel array was designed and fabricated in 55 nm CMOS 1P4M standard process.The chip active area is 48 mm×48 mm with a pixel size of 5.7μm×5.7μm.The measured results achieved a high intrinsic dynamic range of 75 d B,a low FPN and black level of 0.06%,a low photo response non-uniformity of 1.5%respectively,and an excellent raw sample image taken by the prototype sensor. | GUO Zhongjie YU Ningmei WU Longsheng | 2021 | Chinese Journal of Electronics2021，30，2： | 1 |
| 10 | An improved binocular localization method for apple based on fruit detection using deep learning显示文摘Apple picking robot is now being developed as an alternative to hand picking due to a great demand for labor during apple harvest season.Accurate detection and localization of target fruit is necessary for robotic apple picking.Detection accuracy has a great influence on localization results.Although current researches on detection and localization of apples using traditional image algorithms can obtain good results under laboratory conditions,it is difficult to accurately detect and locate objects in natural field with complex environments.With the rapid development of artificial intelligence,accuracy of apple detection based on deep learning has been significantly improved.Therefore,a deep learningbased method was developed to accurately detect and locate the position of fruit.For different localization methods,binocular localization is a widely used localization method for its bionic principle and lower equipment cost.Hence,this paper proposed an improved binocular localization method for apple based on fruit detection using deep learning.First,apples of binocular images were detected by Faster R-CNN.After that,a segmentation based on chromatic aberration and chromatic aberration ratio was applied to segment apple and background pixels in bounding box of detected fruit.Furthermore,template matching with parallel polar line constraint was used to match apples in left and right images.Finally,two feature points on apples were selected to directly calculate three dimensional coordinates of feature points with the binocular localization principle.In this study,Faster R-CNN achieved an AP of 88.12%with an average detection speed of 0.32 s for an image.Meanwhile,standard deviation and localization precision of depth of two feature points on each apple were calculated to evaluate localization.Results showed that the average standard deviation and the average localization precision of 76 groups of datasets were 0.51 cm and 99.64%,respectively.Results indicated that the proposed improved binocular localization method is promising for fruit localization。 | Tengfei Li Wentai Fang Guanao Zhao Fangfang Gao Zhenchao Wu Rui Li Longsheng Fu Jaspreet Dhupia | 2023 | Information Processing in Agriculture2023，10，2： | 1 |
| 11 | Analysis of single event transient pulse-width in 65 nm commercial radiation-hardened logic cell显示文摘With the critical charge reduced to generate a single event effect(SEE) and high working frequency for a nanometer integrated circuit,the single event effect(SET) becomes increasingly serious for high performance SOC and DSP chips.To analyze the radiation-hardened method of SET for the nanometer integrated circuit,the n^+ guard ring and p^+ guard ring have been adopted in the layout for a 65 nm commercial radiation-hardened standard cell library.The weakest driving capacity inverter cell was used to evaluate the single event transient(SET) pulse-width distribution.We employed a dual-lane measurement circuit to get more accurate SET'S pulsewidth.Six kinds of ions,which provide LETs of 12.5,22.5,32.5,42,63,and 79.5 MeV·cm^2/mg,respectively,have been utilized to irradiate the SET test circuit in the Beijing Tandem Accelerator Nuclear Physics National Laboratory.The testing results reveal that the pulse-width of most SETs is shorter than 400 ps in the range of LET_(eff) from 12.5 MeV·cm^2/mg to 79.5 MeV·cm^2/mg and the pulse-width presents saturation tendency when the effective linear energy transfer(LET_(eff)) value is larger than 40 MeV·cm^2/mg.The test results also show that the hardened commercial standard cell's pulse-width concentrates on 33 to 264 ps,which decreases by 40% compared to the pulse-width of the 65 nm commercial unhardened standard cell. | Haisong Li Longsheng Wu Bo Yang Yihu Jiang | 2017 | Journal of Semiconductors2017，38，8： | 1 |
| 12 | Scorpion-inspired dual-bionic,microcrack-assisted wrinkle based laser induced graphene-silver strain sensor with high sensitivity and broad working range for wireless health monitoring system显示文摘Scorpions,through ruthless survival of the fittest,evolve the unique ability to quickly locate and hunt prey with slit receptors near the leg joints and a sharp sting on the multi-freedom tail.Inspired by this fantastic creature,we herein report a dual-bionic strategy to fabricate microcrack-assisted wrinkle strain sensor with both high sensitivity and stretchability.Specifically,laserinduced graphene(LIG)is transferred from polyimide film to Ecoflex and then coated with silver paste using the casting-andpeeling and prestretch-and-release methods.The shape-adaptive and long-range ordered geometry(e.g.,amplitude and wavelength)of dual-bionic structure is prestrain-tuned to optimize the superfast response time(~76 ms),high sensitivity(gauge factor=223.6),broad working range(70%–100%),and good reliability(>800 cycles)of scorpion-inspired strain sensor,outperforming many LIG-based materials and other bionic sensors.The alternate reconnect/disconnect behaviors of slit-organlike microcracks in the mechanical weak areas initiate tremendous resistance changes,whereas the scorpion-tail-like wrinkles act as a“bridge”connecting the adjacent LIG resistor units,enabling reversible resilience and unimpeded electrical linkages over a wide strain range.Combined with the self-developed miniaturized,flexible,and all-in-one wireless transmission system,a variety of scenarios such as large body movements,tiny pulse,and heartbeat are real-time monitored via bluetooth and displayed in the client-sides,revealing a huge promise in future wearable electronics. | Wentao Wang Longsheng Lu Xiaoyu Lu Zhanbo Liang Honghao Lin Zehong Li Xiaohua Wu Lihui Lin Yingxi Xie | 2023 | Nano Research2023，16，1： | 0 |
| 13 | Observation of Collimated Atoms by Light Pressure Force in Absorption Cell显示文摘Experimental observation of laser cooling and collimation of moving atoms in an absorption cell by light pressure force of an intense standing light wave field is reported.The hyper fine structure of atomic sodium has been observed due to the cooled and collimated atoms.The mechanism of laser cooling and collimation of atoms is discussed. | WANG Yuzhu YE Chao WU Yongsheng WANG Xiaojuan ZHOU Shanyu CHENG Yudan MA Longsheng DING Liangen | 1993 | Chinese Physics Letters1993，10，4： | 0 |
| 14 | Fabrication of electrospun bilayer separators for lithium-sulfur batteries:A surface and structure dual modification strategy显示文摘The severe shuttle effect problem of soluble polysulfides greatly hinders the development of long-life lithium-sulfur(Li-S)batteries,which can be improved by separator modification.This study develops a bilayer separator based on an effective surface and structure dual modification strategy.This bilayer separator(named as TCNFs/SPNFs)is constructed by the integration of a carbon-based nanofiber layer(surface modification layer)with a polymer-based nanofiber layer(structure modification layer)through a facile electrospinning process.The excellent electrolyte wettability of the nanofibers accelerates lithium-ion migration,while the good electronic conductivity of the carbon layer facilitates fast electron conduction.The TiO_(2)and SiO_(2)nanoparticles embedded in the separator provide abundant active sites for immobilizing the polysulfides.Owing to these synergistic effects,this multi-functional separator helps inhibit the shuttling problem and thus enhances the active sulfur utilization.The as-prepared battery with the TCNFs/SPNFs separator delivers significantly enhanced the electrochemical performances,producing a low capacity decay rate of 0.061%per cycle at 1 C over 1000 cycles and an admirable rate capacity of 886.7 mAh g^(-1)at 2 C.Even with a high sulfur loading of 4.8 mg cm^(-2),a remarkable areal capacity of 6.0 mAh cm^(-2)is attained.This work is believed to provide a promising strategy to develop novel separators for high-performance Li-S batteries. | XU Ming ZHANG XiaoQing YUAN Wei HUANG HongLin WU YaoPeng WAN ZhenPing LU LongSheng TANG Yong | 2022 | Science China(Technological Sciences)2022，65，12： | 0 |
| 15 | Discussion on Agricultural Religion in the Pre-Qin Period of China显示文摘Since ancient times,agricultural religion has been infiltrated into all aspects of economic,political and social life in China. Using rich historical data such as archeology,anthropology and ethnology,this paper discussed the historical process of agricultural religion in the pre-Qin period from animal worship to agricultural worship. It also discussed the agricultural objects,land,celestial nature,and labor ghosts.Finally,it revealed the inevitable trend of combination of social sacrificing activities. | Longsheng WU | 2017 | Asian Agricultural Research2017，9，3： | 0 |
| 16 | Achieving integrated capture and reduction of CO_(2):A promising electrocatalyst显示文摘To realize the goal of carbon peaking and carbon neutrality,CO_(2) capture and utilization technology is becoming increasingly urgent.However,the low efficiency and complex processes limit its large-scale application.Among utilization technology of CO_(2),electrochemical CO_(2) reduction reaction(CO_(2)RR)has attracted interest,attributing to the use of clean energy and the final product of value-added fuels.The construction of catalysts with integrated CO_(2) capture and reduction ability is expected to bridge the gap between CO_(2) capture and conversion,achieving the direct utilization of flue gas,reducing costs,and simplifying devices.Keeping` this in mind,we give this review to introduce the problems of lowconcentration CO_(2)RR and the significance of coupled CO_(2) capture/conversion electrocatalysts in addressing the emission of industrial flue gas first.Then,the regulation strategies,including functional group modification,co-catalytic effect,and catalysts-impurities interaction,which affected the CO_(2) capture and electroreduction capacity towards catalysts were summarized and discussed.Finally,the challenges and perspectives about the design for linked CO_(2) capture/conversion processes were proposed.This review will provide new insight into the building of multifunctional catalysts for CO_(2) conversion. | Mengjie Liu Longsheng Zhan Yuchao Wang Xin Zhao Jiao Wu Danni Deng Jiabi Jiang Xinran Zheng Yongpeng Lei | 2023 | Journal of Materials Science & Technology2023，，34： | 0 |
| 17 | Design, Synthesis and Antitumor Activity of Novel 6,7-Dimethoxyquinazoline Derivatives Containing Diaryl Urea Moiety显示文摘 | HOU Yunlei WU Shasha MA Longsheng BAI Jinying LIU Zijian ZHAO Yanfang | 2015 | Chemical Research in Chinese Universities2015，31，5： | 0 |
| 18 | Exploring the attenuation mechanisms of Dalbergia odorifera leaves extract on cerebral ischemia-reperfusion based on weighted gene co-expression network analysis显示文摘The attenuation function of Dalbergia odorifera leaves on cerebral ischemia-reperfusion(I/R)is little known.The candidate targets for the Chinese herb were extracted from brain tissues through the high-affinity chromatography.The molecular mechanism of D.odorifera leaves on cerebral I/R was investigated.Methods:Serial affinity chromatography based on D.odorifera leaves extract(DLE)affinity matrices were applied to find specific binding proteins in the brain tissues implemented on C57BL/6 mice by intraluminal middle cerebral artery occlusion for 1 h and reperfusion for 24 h.Specific binding proteins were subjected to mass-spectrometry to search for the differentially expressed proteins between control and DLE-affinity matrices.The hub genes were screened based on weighted gene co-expression network analysis(WGCNA).Then,predictive biology and potential experimental verification were performed for the candidate genes.The protective role of DLE in blood-brain barrier damage in cerebral I/R mice was evaluated by the leakage of Evans blue,western blotting,immunohistochemistry,and immunofluorescent staining.Results:952 differentially expressed proteins were classified into seven modules based on WGCNA under soft threshold 6.Based on WGCNA,AKT1,PIK3CA,NOS3,SMAD3,SMAD1,IL6,MAPK1,TGFBR2,TGFBR1,MAPK3,IGF1R,LRG1,mTOR,ROCK1,TGFB1,IL1B,SMAD2,and SMAD518 candidate hub proteins were involved in turquoise module.TGF-β,MAPK,focal adhesion,and adherens junction signaling pathway were associated with candidate hub proteins.Gene ontology analysis demonstrated that candidate hub proteins were related to the TGF-βreceptor signaling pathway,common-partner SMAD protein phosphorylation,etc.DLE could significantly reduce the leakage of Evans blue in mice with cerebral I/R,while attenuating the expression of occludin,claudin-5,and zonula occludens-1.Western blotting demonstrated that regulation of TGF-β/SMAD signaling pathway played an essential role in the protective effect of DLE.Conclusion:Thus,a number of candidate hub proteins were identified based on DLE affinity chromatography through WGCNA.DLE could attenuate the dysfunction of bloodbrain barrier in the TGF-β/SMAD signaling pathway induced by cerebral I/R. | JINFANG HU JIANGEN AO LONGSHENG FU YAOQI WU FENG SHAO TIANTIAN XU MINGJIN JIANG SHAOFENG XIONG YANNI LV | 2023 | BIOCELL2023，47，7： | 0 |
| 19 | Transcriptome analysis reveals a potential regulatory mechanism of the lnc-5423.6/IGFBP5 axis in the early stages of mouse thymic involution显示文摘Age-related thymic involution is one of the significant reasons for induced immunity decline.Recent evidence has indicated that lncRNAs are widely involved in regulating organ development.However,the lncRNA expression profiles in mouse thymic involution have not been reported.In this study,we collect mouse thymus at the ages of 1 month,3 months,and 6 months for sequencing to observe the lncRNA and gene expression profiles in the early stages of thymic involution.Through bioinformatics analysis,a triple regulatory network of lncRNA-miRNA-mRNA that contains 29 lncRNAs,145 miRNAs and 12 mRNAs that may be related to thymic involution is identified.Among them,IGFBP5 can reduce the viability,inhibit proliferation and promote apoptosis of mouse medullary thymic epithelial cell line 1(MTEC1)cells through the p53 signaling pathway.In addition,miR-193b-3p can alleviate MTEC1 cell apoptosis by targeting IGFBP5.Notably,lnc-5423.6 can act as a molecular sponge of miR-193b-3p to regulate the expression of IGFBP5.In summary,lnc-5423.6 enhances the expression of IGFBP5 by adsorption of miR-193b-3p,thereby promoting MTEC1 cell apoptosis. | Bingxin Li Yaqiong Ye Longsheng Hong Wanyan Li Qingru Wu Wenjun Liu Yongjiang Ma Danning Xu Yugu Li | 2023 | Acta Biochimica et Biophysica Sinica2023，55，4： | 0 |
| 20 | Precipitation-dissolution behaviors of rare earth ions in H_3PO_4-Ca(H_2PO_4)_2 solutions显示文摘In order to achieve deeper understanding of rare earth elements(REEs) behaviors during phosphate rock processing with H_3PO_4. The solubility of REEs in Ca(H_2PO_4)_2-H_3PO_4 solutions with various concentrations of Ca(H_2PO_4)_2 at different temperatures were tested. The results demonstrate that REEs solubility decreases sharply with the increasing concentration of Ca(H_2PO_4)_2. Equations between [REE^(3+)] and [H^+],[H^+] and [Ca^(2+)] in Ca(H_2PO_4)_2-H_3PO_4 solutions were built based on the precipitation-dissolution equilibrium of rare earth phosphates and the ionization equilibrium of H_3PO_4. According to the equations, the decreasing mechanism of REEs solubility caused by elevated concentration of Ca(H_2PO_4)_2 was determined. The mechanism can be illustrated as that the elevated concentration of [H_2 PO_4^-] decreases the concentration of hydrogen ion by retarding the ionization process of H_3PO_4 and directly promotes the precipitation of rare earth phosphates. Furthermore, it can be easy deduced that similar effect would be caused by the other cation impurities(Fe^(3+), Al^(3+), etc.) on REEs solubility based on the mechanism. In addition, superimposed reduction effect on REEs solubility caused by the elevated concentration of Ca(H_2PO_4)_2 and the elevated temperature is found. This superimposed effect leads to a super low solubility of REEs in Ca(H_2PO_4)_2-H_3PO_4 solution. On the basis of the experimental study, outlooks and suggestions for further development of REEs recovery method are given. | Shengxi Wu Longsheng Zhao Liangshi Wang Xiaowei Huang Yunhan Zhang Zongyu Feng Dali Cui | 2019 | Journal of Rare Earths2019，37，5： | 0 |
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