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Reaction behaviors of Pb and Zn sulfates during reduction roasting of Zn leaching residue and flotation of artificial sulfide minerals

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International Journal of Minerals,Metallurgy and Materials 2021年第3期28卷 358-366页

作者： Yong-xing Zheng Jilai Ning Wei Liu Pan-jin Hu Jin-fang Lü Jie Pang State Key Laboratory of Complex Nonferrous Metal Resources Clean utilization Kunming University of Science and TechnologyKunming 650093China Faculty of land Resource Engineering Kunming University of Science and TechnologyKunming 650093China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

To evaluate the feasibility of recovering Pb and Zn sulfides and Ag-containing minerals from Zn leaching residue by the process of reduction roasting followed by flotation,the reaction behaviors of Pb and Zn sulfates during this process were *** analysis showed that the transformation ratios of PbSO4 and ZnSO4 could reach 65.51%and 52.12%,respectively,after reduction roasting,and the introduction of a sulfidation agent could improve the transformation ratios of these *** electron microscopy-energy dispersive spectroscopy(SEM-EDS)revealed that temperature obviously affects the particle size,crystal growth,and morphology of the artificial Pb and Zn sulfide *** size analysis demonstrated that the particle size of the materials increases after *** tests revealed that a flotation concentrate composed of 12.01wt%Pb,27.78wt%Zn,and 6.975×10^(−2)wt%Ag with recoveries of 60.54%,29.24%,and 57.64%,respectively,could be obtained after roasting.

关键词： zinc leaching residue reduction roasting flotation Pb and Zn sulfates artificial sulfides

SNP-based QTL mapping for panicle traits in the japonica super rice cultivar Liaoxing 1

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The Crop Journal 2020年第5期8卷 769-780页

作者： Mingzhu Zhao Zuobin Ma Lili Wang Zhiqiang Tang Ting Mao Chuanbin Liang Hong Gao Liying Zhang Na He Liang Fu Changhua Wang Guomin Sui Wenjing Zheng Institute of Rice Research Liaoning Academy of Agricultural SciencesShenyang 110000LiaoningChina Institute of Rice Research Shenyang Agricultural UniversityShenyang 110161LiaoningChina Liaoning Province Saline and Alkaline land utilization and Research Institute Panjin 124010LiaoningChina

Panicle traits directly associated with yield are a target of selection in rice *** abundant QTL for panicle traits have been identified,there is little information about the genetic basis of panicle traits in japonica super rice(JSR)*** this study,we identified QTL for panicle traits in three environments using a population of recombinant inbred lines(RILs)derived from the JSR cultivar Liaoxing 1.A total of 197 RILs were genotyped with 285 polymorphic SNP *** data and best linear unbiased prediction(BLUP)value of primary branch number(BNP),secondary branch number(BNS),grain number on primary branch(GNP),grain number on secondary branch(GNS),grain number per panicle(GN),panicle length(PL)and grain density(GD)were used for QTL mapping.A total of 105 QTL for seven panicle traits were detected in single environments using their BLUP *** QTL explained 0.51%–52.22%of the phenotypic *** the 105,49 were also detected by joint multi-environment *** stable QTL:qGD9,qPL9,qGNP9,qGN6,and qBNS6.2 were identified in multiple ***9,qGNP9,and qPL9,co-localizing on chromosome 9,likely correspond to the known gene ***,qGN6 and qBNS6.2 in a co-localization region were identified as novel QTL,and their Liaoxing 1 alleles had a positive *** RILs with the QTL allele combinations qGD9/qPL9/qGNP9 and qGN6/qBNS6.2 showed greater *** investigation of the putative gene underlying qGN6/qBNS6.2 would shed light on the molecular mechanism of JSR.

关键词： cultivar panicle effect.

Practical configured microtremor array measurements(MAMs)for the geological investigation of underground space

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Underground Space 2021年第3期6卷 240-251页

作者： Taeseo Ku Subramaniam Palanidoss Yunhuo Zhang Sung-Woo Moon Xiao Wei Ean Seong Huang Jeyatharan Kumarasamy Kok Hun Goh Department of Civil and Environmental Engineering National University of SingaporeSingapore Geotechnical and Tunnel Division Land Transport AuthoritySingapore Department of Civil and Environmental Engineering Nazarbayev UniversityKazakhstan Geosystems Land Transport AuthoritySingapore Infrastructure Design and land Land Transport AuthoritySingapore

Underground space utilization is becoming increasingly essential for modern metropolitan cities such as *** a soil/rock interface using traditional borehole investigation methods is expensive and difficult,owing to the numerous physical constraints within a built-up *** are often far apart,resulting in many unforeseen ground conditions during subsequent *** methods are sometimes employed as possible alternatives for fast,economical,and efficient bedrock *** goal of this study is to investigate the practical details of applying microtremor array measurement(MAM)as a non-invasive surface wave survey for mapping soil/rock interfaces in *** configurations in field data acquisition are examined,and practical recommendations for array construction are *** addition,30 in situ MAM tests are carried out for two major geological formations in *** the results,a standard shear wave velocity(V_(s))of 500 m/s is found to be suitable for interpreting the soil/rock interface,for the Bukit Timah Granite and Jurong ***,the method does not predict well when soft Kallang formation deposits are *** limitations are also discussed in the later parts of this *** and practical recommendations are discussed,providing constructive guidance to the *** proposed Vs-based method and associated guidelines and limitations can be used to create a digital geological database and are especially useful for rock profiling in an urban environment.

关键词： Array configuration MAM Non-invasive site investigation Soil/rock interface Surface wave survey

Optimizing slope safety factor prediction via stacking using sparrow search algorithm for multi-layer machine learning regression models

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Journal of Mountain Science 2023年第10期20卷 2852-2868页

作者： SHUI Kuan HOU Ke-peng HOU Wen-wen SUN Jun-long SUN Hua-fen Faculty of land Resource Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan Key Laboratory of Sino-German Blue Mining and utilization of Special Underground Space Kunming 650093China College of Water Resource and Hydropower Sichuan UniversityChengdu 610065China

The safety factor is a crucial quantitative index for evaluating slope ***,the traditional calculation methods suffer from unreasonable assumptions,complex soil composition,and inadequate consideration of the influencing factors,leading to large errors in their ***,a stacking ensemble learning model(stacking-SSAOP)based on multi-layer regression algorithm fusion and optimized by the sparrow search algorithm is proposed for predicting the slope safety *** this method,the density,cohesion,friction angle,slope angle,slope height,and pore pressure ratio are selected as characteristic parameters from the 210 sets of established slope sample *** Forest,Extra Trees,AdaBoost,Bagging,and Support Vector regression are used as the base model(inner loop)to construct the first-level regression algorithm layer,and XGBoost is used as the meta-model(outer loop)to construct the second-level regression algorithm layer and complete the construction of the stacked learning model for improving the model prediction *** sparrow search algorithm is used to optimize the hyperparameters of the above six regression models and correct the over-and underfitting problems of the single regression model to further improve the prediction *** mean square error(MSE)of the predicted and true values and the fitting of the data are compared and *** MSE of the stacking-SSAOP model was found to be smaller than that of the single regression model(MSE=0.03917).Therefore,the former has a higher prediction accuracy and better data *** study innovatively applies the sparrow search algorithm to predict the slope safety factor,showcasing its advantages over traditional ***,our proposed stacking-SSAOP model integrates multiple regression algorithms to enhance prediction *** model not only refines the prediction accuracy of the slope safety factor but also offers a fresh approach to handling the intricate

关键词： Multi-layer regression algorithm fusion Stacking gensemblelearning Sparrow search algorithm Slope safety factor Data prediction

Urban vacant land in growing urbanization:An international review

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Journal of Geographical Sciences 2020年第4期30卷 669-687页

作者： SONG Xiaoqing WEN Mengmeng SHEN Yajing FENG Qi XIANG Jingwei ZHANG Weina ZHAO Guosong WU Zhifeng Research Center for Spatial Planning and Human-Environment System Simulation School of Geography and Information EngineeringChina University of GeosciencesWuhan 430074China Hunan Key Laboratory of land Resources Evaluation and utilization Hunan Planning Institute of Land and ResourcesChangsha 410007China School of Public Administration China University of GeosciencesWuhan 430074China School of Geographical Sciences Guangzhou UniversityGuangzhou 510006China

Urban growth and shrinkage constitute the overall pattern of growing urbanization across the *** on urban vacant land(UVL)are few,and have proved to be mainly rudimentary and *** paper first presents the definition of UVL based on bibliometric ***,morphology,proximate causes,and the multiple functions of UVL are then analyzed at parcel,transect,city,and national levels based on an international *** show that UVL can be categorized by land cover,land usage,and land ***,UVL has been widespread and *** example,the occurrence probabilities of UVL in the cases of Guangzhou and New York are 8.46%-8.88%and 3.17%-5.08%,*** average vacancy rate of residential land amounts to 11.48%in 65 ***,UVL shows fragmentation and irregular shape,and significant spatial differences exist at parcel,transect,city,and national *** causes,such as excessive land division,irregularly shaped land parcels,decreases in resident population,deindustrialization,land speculation,insufficient investment,and environmental concerns,can all result in ***,UVL has become a gray area of social,economic,and ecological ***,it can also be considered a potential resource for enhancing urban *** implications to promote urban sustainability using monitoring,control,and differential revitalization of UVL are presented.

关键词： urban vacant land urbanization shrinking cities land use transition

Flotation behaviors of chalcopyrite and galena using ferrate(Ⅵ) as a depressant

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International Journal of Mining Science and Technology 2023年第1期33卷 93-103页

作者： Yongxing Zheng Yusong Huang Panjin Hu Xianhui Qiu Jinfang Lv Lingyun Bao State Key Laboratory of Complex Nonferrous Metal Resources Clean utilization Kunming University of Science and TechnologyKunming 650093China Faculty of land Resource Engineering Kunming University of Science and TechnologyKunming 650093China Faculty of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

This paper investigated the effects of potassium ferrate(PF)on the flotation performances of chalcopyrite and *** flotation results showed that PF obviously depressed galena,but had little effects on the floatability of chalcopyrite within pH range of 4.0–*** potential tests showed that the addition of PF induced the formation of more amounts of hydrophilic species on the surface of galena under an alkaline *** grade O-isopropyl-N-ethyl thionocarbamate(IPETC)chemically adsorbed on the surface of the PF-treated chalcopyrite and galena after its *** angle measurements showed that with the addition of PF,the contact angle of the galena surface significantly decreased compared with the chalcopyrite *** electrochemical impedance spectroscopy(LEIS)tests showed that the addition of PF increased the impedance of the galena surface.X-ray photoelectron spectroscopy(XPS)analyses revealed that the formation of hydrophilic species,namely lead sulfite,lead hydroxide and ferric hydroxide,on the galena surface,decreased its floatability in the presence of PF,while the formation of hydrophobic species,namely copper disulfide and elemental sulfur,on the chalcopyrite surface,maintained its ***,a descriptive model for the reaction of PF with chalcopyrite and galena was proposed.

关键词： Flotation Chalcopyrite Galena Potassium ferrate

The efficient utilization of low-grade scheelite with X-ray transmission sorting and mixed collectors

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Tungsten 2023年第4期5卷 570-580页

作者： Qi-Hong Xu Zhi-An Liang Hao Duan Zhong-Mei Sun Wei-Xin Wu State Key Laboratory of Comprehensive utilization of Low-Grade Refractory Gold Ores Longyan364200China Xiamen Zijin Technology of Mining&Metallurgy Ltd Xiamen361101China Faculty of land Resource Engineering Kunming University of Science and TechnologyKunming650093China

Nowadays,with the depletion of high-grade scheelite resources,the efficient exploitation of complex,low grade with complicated geological structure scheelite ore have to take into *** work introduces a feasible mineral processing method for the beneficiation of low grade and complex scheelite using the X-ray transmission(XRT) pre-concentration technology and mixed *** results of XRT sorting shown that 94.85% WO_(3) can be recovered with the discarding rate reached40.62%.The closed-circuit flotation of actual ore using mixed collector obtained scheelite concentrate of 61.09% WO_(3) grade with WO_(3) recovery of 89.49%.The combined flowsheet of XRT sorting and mixed collector brought about RMB 4.5 million yuan profit per year for the mine company.

关键词： Scheelite XRT sorting Mixed collector Sustainability

A New Fossil Erinaceidae from the Shajingyi Area in the Lanzhou Basin, China

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 789-798页

作者： LI Zhichao LI Yongxiang XUE Xiangxu LI Wenhou ZHANG Yunxiang YANG Fu School of Earth Science and Resources Chang’an UniversityXi’an 710054China State Key laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China Key Laboratory of Coal Resources Exploration and Comprehensive utilization Ministry of Land and ResourcesXi’an 710021China

Here,we describe a new primitive Erinaceidae species,Oligoechinus lanzhouensis ***.,based on a specimen from late Oligocene strata of the Lanzhou Basin,Gansu *** characteristics are as follows:the M1 width is longer than the length,the metastyle extends far disto-labially,the posterior margin has strong curve and a distinct metaconule that is connected to the protocone by a postprotocrista is located in the centre of the *** posterior arm of the metaconule is poorly *** the P4,the pterion of the metastyle is less developed and the metacone is *** addition,*** has a premolar larger than the canine tooth(P2>C)and P3 had no molarisation,characters also possessed by ***,*** was similar to Mioechinus based on architectural tooth features,demonstrating a closed genetic *** Erinaceidae are relatively rare before the *** discovery of *** provides an important insight into the origin of Mioechinus in China and the early evolution of the *** analysis shows that a relatively recent ancestor of Mioechinus had probably existed in the early Oligocene and that *** was likely an ancestral type of Mioechinus gobiensis,and its systematic position should be located at a transitional position between Amphechinus and Mioechinus.

关键词： Erinaceidae Oligoechinus Lanzhou basin Oligocene

The comprehensive evaluation on resource environmental bearing capacity of central cities in the Yellow River Delta-A case study on Dongying City

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Journal of Groundwater Science and Engineering 2017年第4期5卷 354-363页

作者： WANG Kui-feng XU Meng CHEN Xiao-man Shandong Institute and Laboratory of Geological Sciences Key Laboratory of Geological Process and Resource Utilization of Metallic Minerals in ShandongKey Laboratory of Gold Mineralization Process and Resource Utilization Subordinate to the Ministryof Land and ResourceJinan 250013China Key Laboratory of Assessing Resource Environmental bearing capacity Ministry of Land and Resources(Chinese Academy of Land and Resource EconomicsChina University of Geosciences in Beijing)Beijing 101149China School of Civil Engineering Shandong UniversityJinan 250061China Guangdong Research Center for Geoanalysis GuangzhouGuangdong Province 510080China

Dongying City, which is the most important central city in the Yellow River Delta, is located in the estuary of the Yellow River. With a short land formation time, ecological environment is very weak in this area. To realize the sustainable economic development of the Yellow River Delta, resource environment and resource environmental bearing capacity(REBC) must be improved. This study builds assessment system of regional REBC through resource and economic characteristics in Yellow River Delta and uses principal component analysis(PCA) method to evaluate REBC of five counties and districts in Dongying City in 2011-2015 on the dimensions of time and space. Results show that, on the time dimension, Guangrao County is ranked first, Dongying district second for four years and Hekou and Kenli districts with lower ranks in 2012-2015, indicating that more attention needs to be paid to REBC of Hekou and Dongying districts and these two districts should be included into key monitoring areas. From space scale, REBC in five counties and districts has been gradually improving. In order to further develop REBC in Dongying City, measures such as intensifying protection of urban ecological environment and developing circular economy, etc. should be implemented.

关键词： Resource environmental bearing capacity Dongying City Comprehensive evaluation Yellow River Delta