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| 1 | STUDY ON CONCENTRATING SULFURIC ACID SOLUTION BY VACUUM MEMBRANE DISTILLATION显示文摘Concentrating sulfuric acid solution by vacuum membrane distillation with flat PEFE membrane is explored. The effects of sulfuric acid concentration, temperature of the feed, the vacuum degree of the vacuum side on the flux of membrane distillation and the separation efficiency of acid are investigated. The results illustrate that the flux of the membrane distillation increases with the rise of feed temperature and the vacuum degree of the vacuum side, but it decreases with the rise of the sulfuric acid concentration of the feed. The separation efficiency of acid is correlated with the flux of membrane distillation; the separation efficiency of the acid can amount to 100% in the process, when operative conditions are properly controlled. It can also been obtained from the experiment that, compared with other methods of membrane distillation, the vacuum membrane distillation can obtain greater distillation flux. | Zhang Guiqing Zhang Qixiu Zhou Kanggen (Department of Metallurgical Science and Engineering, Central South University of Technology, Changsha 410083, China) | 1999 | Journal of Central South University1999，11，2： | 16 |
| 2 | ACID RECOVERY FROM WASTE SULFURIC ACID BY DIFFUSION DIALYSIS显示文摘In the process of sulfuric acid production from pyrite, there is a lot of waste acid produced in fume washing with dilute acid. Acid recovery from this sort of waste sulfuric acid by diffusion dialysis is studied in the paper. The mass transfer dialysis coefficient of sulfuric acid of the membrane AFX is measured, the effect of the flowrate of the feed and ratio of feed to water is investigated, and the two kinds of membrane (AFX and S203) are compared. The results show that diffusion dialysis process can separate the metal cation from sulfuric acid effectively, but it is difficult to separate non cation impurities as As - and F -. The contrast tests of the two membranes show that the dialysis mass transfer coefficient of the membrane AFX is larger, while capacity of the removing impurities of membrane S203 is somewhat better. | Zhang Guiqing Zhang Qixiu Zhou Kanggen (Department of Metallurgical Science and Engineering, Central South University of Technology, Changsha 410083, China) | 1999 | Journal of Central South University1999，11，2： | 6 |
| 3 | Latitude migration of solar activity at high latitudes显示文摘Utilized here is the Carte Synoptique solar filament archive, namely the catalogue of solar filaments from March 1919 to December 1989, corresponding to solar rotation numbers 876 to 1823 to study latitudinal migration of solar activity at high latitudes. Except the well-known poleward migration of solar activity from middle latitudes to the poles, an equatorward migration is found from the solar poles toward middle latitudes (about 40°) within a normal cycle, which is neglected before, and the time in-terval for the former migration (4.4 years) is about 2.2 years shorter than that for the latter (6.6 years), indicating that the change from one migration to the other takes place around the maximum time of a normal cycle. In the future, a dynamo model should represent the migration from the poles toward middle latitudes of the Sun, besides the migration in 'butterfly diagrams' and the 'rush to the poles'. The traditional extended activity cycle is actually a part of the period of the successive migration from the poles toward the solar equator. | GAO PengXin LI KeJun Li QiXiu | 2008 | Chinese Science Bulletin2008，53，1： | 3 |
| 4 | PREPARATION OF ULTRAFINE ALUMINA POWDERS BY ALUMINUM ISOPROPOXIDE显示文摘PREPARATIONOFULTRAFINEALUMINAPOWDERSBYALUMINUMISOPROPOXIDEPREPARATIONOFULTRAFINEALUMINAPOWDERSBYALUMINUMISOPROPOXIDE￥Yu,Zhong... | Yu,Zhongqing Zhao,Qinsheng Zhang,Qixiu(Department of Nonferrous Metallurgy,Central South University of Techonology,Changsha 410083) | 1994 | 中国有色金属学会会刊:英文版1994，4，2： | 2 |
| 5 | New hydrometallurgical process for production of high-purity ammonium paratungstate from refractory low-grade tungsten material显示文摘 | Zhang Qixiu Gong Bofan Huang Weizhuang | 1989 | Today''s Technology For The Mining and Metallurgical Industries1989，，24： | 1 |
| 6 | Photodegradation catalyst screening by combinatorial methodology 显示文摘 | Dai Qixiu Xiao Haiyuan Li Wensheng | 2005 | Applied Catalysis:A General2005，290，12： | 1 |
| 7 | STUDY ON CONCENTRATING SULFURIC ACID SOLUTION BY MEMBRANE DISTILLATION WITH METAL - PTFE COMPOSITE MEMBRANE显示文摘concentrating sulfuric acid by membrane distillation in a flat sheet direct contact membrane distillation device with a self made metal PTFE composite membrane has been studied. The effect of sulfuric acid concentration of feed, the flowrate and liquor temperature in high temperature side and low temperature side on the flux and separation efficiency is investigated. The stability of this composite membrane is also inspected. The experimental results show that the metal PTFE composite membrane can be used in membrane distillation, and its properties are very stable. It is feasible to concentrate sulfuric acid by membrane distillation with this membrane. | Guiqing Zhang Qixiu Zhang Kanggen Zhou Aiping Luo | 1999 | Journal of Central South University1999，11，2： | 1 |
| 8 | Expanded Industrial Experiments of Free-alkali Recovery from Sodium Tungstate Solution by the Membrane Electrolysis Process显示文摘The expanded industrial experiments were conducted with practical industfial liquor to separate free alkali from sodium tungstate solution by electrolysis with canon-exchange membrane. Experimental results show that on the condition that the temperature is 50-55℃ and the current density is 1000 A/m2, the single electrolysis cell is operated stably and 80% free-alkali in mass fraction is separated from the anode feed liquor of sodium tungstate, with electric ef- ficiency up to more than 88% and the unit energy consumption E lower than 1900 kWh/t; while three electfolysis cells in series are operated, under the condition that the temperature is 60-65 ℃ and the current density is 1000 A/m2, the elec- tric efficiency can reach higher than 88% and the unit energy consumption E can be lower than 2250 kWh/t. | Liansheng Xiao, Qixiu Zhang, Guiqing Zhang, Bofan Gong (Metallurgical Separation Science and Engineering Lab, Central South University, Changsha 410083, China) | 2001 | Rare Metals2001，20，2： | 1 |
| 9 | The Sinian——Cambrian Boundary of China (Summarized in English)显示文摘 | Xing Yusheng Ding Qixiu Luo Huilin He Tinggui and Wang Yangeng | 1984 | 中国地质科学院地质研究所文集1984，，00： | 1 |
| 10 | Industrial application of the technique of removing Mo by a combination of moving packed bed and fluidized bed ion exchange显示文摘The application of the technique of removing molybdenum by moving packed bed and fluidized bed ion-exchange in a factory was described. The data showed that the Mo removal efficiency is above 99%, and the Mo content inAFT (Ammonium Paratungstate) is controlled steadily below 18 × 10-6, in the case of treating the feed liquor containing Mo1.4 g/L. The technique is simple and convenient in operation, good reusability of resin, loss consumption of desorption rea-gent and little pollution on environment. The loss of tungsten is less than 0.5%. The technique has been proved to be aneconomical and efficient process for Mo removal. | XIAO Liansheng, ZHANG Qixiu, GONG Bofan, and HUANG ShaoyingMetallurgical Separation Science and Engineering Lab., Central South University, Changsha 410083, China (Received 2002-05-08) | 2003 | Rare Metals2003，22，2： | 1 |
| 11 | 显示文摘 | Qiu Jieshan Li Qixiu Wang Zhiyu | 2006 | Carbon2006，44，12： | 1 |
| 12 | Preparation, characterization and application of a new kind of mesoporous composite 显示文摘 | Youjin Zhang Qixiu Hu Biao Hu | 2006 | Materials Chemistry and Physics2006，96，： | 1 |
| 13 | Integral approach to compacton solutions of Boussinesq-like B ( m , n ) equation with fully nonlinear dispersion显示文摘 | Zhengrong Liu Qingmei Lin Qixiu Li | 2003 | Chaos Solitons and Fractals2003，，5： | 1 |
| 14 | Theoretical analysis and numerical solution of laser pulse transformation for satellite laser ranging显示文摘 | Jianxing Fan Fumin Yang Qixiu Chen | 2001 | Science in China Series A: Mathematics2001，，7： | 1 |
| 15 | Optimal Nonlinear Distance Toll for Cordon-Based Congestion Pricing Considering Equity Issue显示文摘In order to address the optimal distance toll design problem for cordon-based congestion pricing incorporating the issue of equity,this paper presents a toll user equilibrium( TUE) model based on a transformed network with elastic demand,to evaluate any given toll charge function. A bi-level programming model is developed for determining the optimal toll levels,with the TUE being represented at the lower level.The upper level optimizes the total equity level over the transport network,represented by the Gini coefficient,where a constraint is imposed to the total travel impedance of each OD pair after the levy. A genetic algorithm( GA) is implemented to solve the bi-level model,which is verified by a numerical example. | Xin Sun Di Huang Qixiu Cheng | 2016 | Journal of Harbin Institute of Technology(New Series)2016，23，6： | 0 |
| 16 | SELECTION OF DILUENTS FOR COPPER EXTRACTION FROM OIL PRODUCTS显示文摘SELECTIONOFDILUENTSFORCOPPEREXTRACTIONFROMOILPRODUCTS*LuoAipingZhangQixiu(DepartmentofNonferrousMetalurgy,CentralSouthUnivers... | Luo Aiping Zhang Qixiu(Department of Nonferrous Metallurgy, Central South University of Technology,Changsha 410083,China) | 1998 | Journal of Central South University1998，10，1： | 0 |
| 17 | FREE ALKALI RECOVERY FROM NaOH LEACHING LIQUOR OF TUNGSTEN ORE BY ELECTROLYSIS WITH ION-EXCHANGE MEMBRANE显示文摘Thecausticsodaleachingliquoroftungstenore(wolframiteorscheelite)alwayscontainsagreatdealoffreealkaliforthermodynamicandki-net... | Guiqing Zhang Qixiu Zhang | 1998 | Journal of Central South University1998，10，2： | 0 |
| 18 | TREATMENT OF LOW CONCENTRATION LYE OF RED MUD MOUND显示文摘Based on the systematic experiment of treating low concentration lye in the red mud mound, several key problems in the selection of technological process for industrial trial, such as aluminum precipitation in the process of electrodilalysis, dealuminum with carbon dioxide at low temperature, the selection of the technology for electrodialysis and estimation of benefit of the trial production line, are studied in the paper. For a production line with the handling capacity of 50 m 3/h, its annual direct economic benefit can reach RMB 4 million yuan, calculated by 300 working days a year. | Qixiu Zhang Aiping Luo Chongguang Shi Qicai Zheng | 1999 | Journal of Central South University1999，11，2： | 0 |
| 19 | Product Promotion Prediction Model Based on Evaluation Information显示文摘This paper mainly studies the impact of evaluation information on e-commerce platform on the future of products.Through natural language processing and rating,an evaluation model based on user rating and evaluation is defined to measure product quality.Among them,evaluations are differentiated:review sentiment coefficient(R)and review length(L).The evaluation model is:.In order to predict the future reputation of products,based on the above evaluation model,time series is used to rank the products studied.Each customer purchases the product through Markov chain model,so as to predict the probability of future word-of-mouth spread of the product.Use TOPSIS method to select monthly sales,stars and comment sentiment coefficient as indicators.The comprehensive measurement method based on text and score is determined to predict whether the product is successfully promoted. | Qixiu Kang Jing Tang Yuming Wang | 2021 | Modern Electronic Technology2021，5，1： | 0 |
| 20 | Microfossils from the Chert in the Lower Cambrian Shuijingtuo Formation at Miaohe, Zigui, Hubei Province显示文摘This paper reports for the first time on the microfossils discovered in the black cherts of the basal part of the Lower Cambrian Shuijingtuo Formation at Miaohe village, Zigui County, Hubei Province, all of which were observed in thin sections. Nine genera, 9 species and 3 indeterminate species (including a new species) are described. According to these microfossils, the conclusion is made that the microfossil zone may be equivalent to the small shelly fossil assemblage zones 2—3 of the Meishucun stage. They have provided another important line of evidence for the correlation of the Sinian-Cambrian boundary strata with those of the adjacent areas. | Yin Chongyu, Yue Zhao, Gao Linzhi Institute of Geology, CAGS, Beijing and Ding Qixiu Hubei Geological Institute, Hubei Bureau of Geology, Wuhan | 1993 | Acta Geologica Sinica(English Edition)1993，67，2： | 0 |
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