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Preparation of Chitosan-coated Nylon Membranes and their Application as Affinity Membranes

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Chinese Chemical Letters 2005年第8期16卷 1085-1088页

作者： Wei SHI Feng Bao zhang guo liang zhang School of Chemical Engineering ＆ Technology Tianjin University Tianjin 300072 Biomedical Engineering Research Center Medical College Xiamen University Xiamen 361005

Chitosan-coated nylon membranes which possess a large number of reactive groups of-CH2OH and -NH2 were prepared by coupling chitosan onto the nylon membrane. Then polylysine as ligand was also immobilized onto the composite membranes by 1, 1＇-carbonyl-diimidazole activation to prepare affinity membranes for bilirubin adsorption. The results showed that these membranes exhibited high binding affinity capacities for bilirubin and the adsorption isotherm fitted the Freundlich model well.

关键词： Chitosan affinity membrane bilirubin adsorption.

Influencing factors and mechanism of water absorption process of iron ores during sintering

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International Journal of Minerals,Metallurgy and Materials 2014年第2期21卷 122-130页

作者： guo-liang zhang Sheng-li Wu Juan Zhu Yong-zhi Wang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The appropriate content and distribution of sinter moisture play an important role in the granulation of iron ores. In this study, the effects of porosity, size distribution, and particle shape on the water absorption rate （WAR） of four types of iron ores were analyzed by using the immersion method and capillary water absorption method. In addition, the mechanism underlying the water absorption process in iron ores was unraveled. It is found that the WARs of iron ores decrease quickly with the increase in water absorption time at the initial stages of water absorption. With further increase in absorption time, the WARs decrease gradually, until near 0. Iron ores with higher porosity, smaller particle size, and plate-like structure have the higher WARs. Compared with pores in the single-particle iron ore, voids among particles in the multi-particle iron oxide play an important role at the initial stages of water absorption. The water absorption mechanism of all single-particle and multi-particle iron ores analyzed in this study includes four steps, wherein the first three steps play a significant role in the sintering pro-cess.

关键词： iron ores sintering water absorption factor analysis

Interaction Between Elements Nb and Mo During Precipitation in Microalloyed Austenite

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Journal of Iron and Steel Research International 2010年第9期17卷 60-63页

作者： YUAN Shao-qiang liang guo li zhang Xiao-juan Department of Eleetromeehanieal Engineering Tangshan College Tangshan 063000 Hebei China

Thermo-simulation test and transmission electron microscopy （TEM） have been used to investigate the interaction between the microalloying elements Nb and Mo within the precipitates during relaxation after austenite deformation of C-Ti-Mo steel and C-Nb-Mo steel. The experimental results demonstrated that the austenitic structure was preserved both in C-Ti-Mo steel and C-Nb-Mo steel even if they were relaxed for 1000 s after deformation at 850℃. The strainqnduced precipitate occurs in two kinds of steel. Through the energy spectrum analysis, it was found that the precipitates were Ti（C, N） and Mo-bearing Nb（C, N） respectively and there exists a strong affinity of Mo for Nb with in the precipitates. Mo atoms would enter the lattice of Nb（C, N） particles probably after Nb（C, N） formation.

关键词： thermo-simulation microstructure strain-induced precipitation relaxation carbonitride

MOLECULAR WEIGHT DEPENDENCE OF CRYSTAL PATTERN TRANSITIONS OF POLY(ETHYLENE OXIDE)

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Chinese Journal of Polymer Science 2013年第5期31卷 798-808页

作者： guo-liang zhang Liu-xin Jin Ping Zheng 王维 Xiao-jing Wen Center for Synthetic Soft Materials The Key Laboratory of Functional Polymer Materials of Ministry of Education and Institute of Polymer ChemistryCollege of ChemistryNankai University School of Resources and Materials Northeastern University at Qinhuangdao

Crystal patterns in ultrathin films of six poly（ethylene oxide） fractions with molecular weights from 25000 to 932000 g/mol were characterized within crystallization temperature range from 20 ℃to 60℃. Labyrinthine, dendritic and faceted crystal patterns were observed in different temperature ranges, and then labyrinthine-to-dendritic and dendritic-to- faceted transition temperatures T_L-D and T_D-F were quantitatively identified. Their molecular weight dependences are T_L-D（M_w） = T_L-D（∞） -K_L-D/M_w, where T_L-D（∞） = 38.2 ℃ and K_L-D = 253000 ℃.g/mol and T_D-F（M_w） = T_D-F（∞） -K_D-F/M_w, where T_D-F（∞） = 54.7 ℃ and K_D-F= 27000 ℃.g/mol. Quasi two-dimensional blob models were proposed to provide empirical explanations of the molecular weight dependences. The labyrinthine-to-dendritic transition is attributed to a molecular diffusion process change from a local-diffusion to diffusion-limited-aggregation （DLA） and a polymer chain with M_w ≈253000 g/mol within a blob can join crystals independently. The dendritic-to-faceted transition is attributed to a turnover of the pattern formation mechanism from DLA to crystallization control, and a polymer chain with a M_w ≈27000 g/tool as an independent blob crosses to a depletion zone to join crystals. These molecular weight dependences reveal a macromolecular effect on the crystal pattern formation and selection of crystalline polymers.

关键词： Poly(ethylene oxide) Crystallization Pattern formation Transition Molecular weight dependence.

Influence of gangue existing states in iron ores on the formation and flow of liquid phase during sintering

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International Journal of Minerals,Metallurgy and Materials 2014年第10期21卷 962-968页

作者： guo-liang zhang Sheng-li Wu Shao-guo Chen Bo Su Zhi-gang Que Chao-gang Hou School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Gangue existing states largely affect the high-temperature characteristics of iron ores. Using a micro-sintering method and scan- ning electron microscopy, the effects of gangue content, gangue type, and gangue size on the assimilation characteristics and fluidity of liquid phase of five different iron ores were analyzed in this study. Next, the mechanism based on the reaction between gangues and sintering mate- dais was unraveled. The results show that, as the SiO2 levels increase in the iron ores, the lowest assimilation temperature （LAT） decreases, whereas the index of fluidity of liquid phase （IFL） increases. Below 1.5wt%, Al2O3 benefits the assimilation reaction, but higher concentra- tions proved detrimental. Larger quartz particles increase the SiO2 levels at the local reaction interface between the iron ore and CaO, thereby reducing the LAT. Quartz-gibbsite is more conductive to assimilation than kaolin. Quartz-gibbsite and kaolin gangues encourage the forma- tion of liquid-phase low-Al2O3-SFCA with high IFL and high-Al2O3-SFCA with low IFL, respectively.

关键词： iron ores ore sintering assimilation liquid phase fluidity

Biotreatment of oily wastewater by rhamnolipids in aerated active sludge system

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第11期10卷 852-859页

作者： Hong-zi zhang Xu-wei LONG Ru-yi SHA guo-liang zhang Qin MENG Department of Chemical Engineering and Biochemical Engineering Zhejiang University Hangzhou 310027 China Department of Environmental Engineering and Biochemical Engineering Zhejiang University of Technology Hangzhou 310014 China

Oily wastewater generated by various industries creates a major ecological problem throughout the world. The tra- ditional methods for the oily wastewater treatment are inefficient and costly. Surfactants can promote the biodegradation of pe- troleum hydrocarbons by dispersing oil into aqueous environment. In the present study, we applied rhamnolipid-containing cell-free culture broth to enhance the biodegradation of crude oil and lubricating oil in a conventional aerobically-activated sludge system. At 20 ℃, rhamnolipids （11.2 mg/L） increased the removal efficiency of crude oil from 17.7% （in the absence of rham- nolipids） to 63%. At 25 ~C, the removal efficiency of crude oil was over 80% with the presence of rhamnolipids compared with 22.3% in the absence of rhamnolipids. Similarly, rhamnolipid treatment （22.5 mg/L） for 24 h at 20℃ significantly increased the removal rate of lubricating oil to 92% compared with 24% in the absence of rhamnolipids. The enhanced removal of hydrocarbons was mainly attributed to the improved solubility and the reduced interfacial tension by rhamnolipids. We conclude that a direct application of the crude rhamnolipid solution from cell culture is effective and economic in removing oily contaminants from wastewater.

关键词： Oily wastewater Rhamnolipid Aerated active sludge system Biodegradation

Effects of particle characteristics on the granulation ability of iron ores during the sintering process

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International Journal of Minerals,Metallurgy and Materials 2015年第9期22卷 907-916页

作者： Sheng-li Wu Juan Zhu Ji-cheng Bei guo-liang zhang Xiao-bo Zhai School of Metallurgical and Ecological Engineering University Science and Technology Beijing State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

The granulation behavior of iron ores is essential for subsequent parameter optimization and efficient granulation, especially under changing material conditions. In this study, the effects of surface properties and particle size were analyzed using a laboratory granulation method; an estimation of the granulation of sintering blends was subsequently conducted for the base ores. Circularity and porosity were observed to negatively affect the granulation of iron ores, whereas wettability positively affected the granulation and was the most influential factor, indicating that wetting of iron ores is desirable during granulation. When iron ores with complex size distributions were granulated, the equivalent surface area was the main influencing factor for coarse particles larger than 1 mm and the ratio of adhering fines to intermediates was the main factor for fine particles smaller than 1 mm. By combining the granulation of coarse and fine particles with their proportioning, we proposed a calculation method for estimating the granulation ability of sintering blends. Good verification was demonstrated with the designed schemes. The results suggest that the developed method is effective for predicting the granulation of iron ore mixtures.

关键词： iron ores granulation particle size distribution sintering

Influencing factor of sinter body strength and its effects on iron ore sintering indexes

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International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 553-561页

作者： guo-liang zhang Sheng-li Wu Bo Su Zhi-gang Que Chao-gang Hou Yao Jiang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

Sinter body strength, which reflects the strength of sinter, plays an important role in the improvement of sinter. In this study, the sinter body strengths of iron ores were measured using a microsintering method. The relationship between the chemical composition and sinter body strength was discussed. Moreover, sinter-pot tests were performed. The effects of sinter body strength on the sintering indexes were then elucidated, and the bottom limit of sinter body strength of blending ores was confirmed. In the results, the compressive strengths（CSs） of iron ores are observed to decrease with the increasing of the contents of loss on ignition（LOI）, SiO 2, and Al2O3; however, LOI of less than 3wt% does not substantially influence the CSs of fine ores. In the case of similar mineral composition, the porosity, in particular, the ratio between the number of large pores and the total number of pores, strongly influences the sinter body strength. With an increase of the blending-ore CSs used in sinter-pot tests, the yield, productivity, and tumbler strength increase, and the solid fuel consumption decreases. The CSs of the blending ores only slightly affect the sintering time. The CS bottom limit of the blending ores is 310 N. When the CSs of the blending ores increase by 10%, the yield, productivity, and tumbler index increase by 1.9%, 2.8%, and 2.0%, respectively, and the solid fuel consumption decreases by 1.9%.

关键词： iron ore sinter compressive strength influencing factors sintering

Thermal-hydraulic design and transient analysis of passive cooling system for CPR1000 spent fuel storage pool

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Nuclear Science and Techniques 2016年第1期27卷 156-165页

作者： Li Ge Hai-Tao Wang guo-liang zhang Jun-Li Gou Jian-Qiang Shan Bin zhang Bo zhang Tian-Yu Lu Zi-Jiang Yang Yuan Yuan Xi'an Jiaotong University Xi'an 710049China Shanghai Nuclear Engineering Research and Design Institute Shanghai 200233China China Nuclear Power Technology Research Institute Shenzhen 518026China

This paper proposes a design of passive cooling system for CPR1000 spent fuel pool(SFP). Our design can effectively manage the SFP temperature not to exceed80 C. Then the transient analysis of the CPR1000 SFP with designed passive cooling system is carried out in station blackout(SBO) accident by the best-estimate thermal-hydraulic system code RELAP5. The simulation results show that to maintain the temperature of CPR1000 SFP under 80 C, the numbers of the SFP and air cooling heat exchangers tubes are 6627 and 19 086, *** height difference between the bottom of the air cooling heat exchanger and the top of the SFP heat exchanger is3.8 m. The number of SFP heat exchanger tubes decreases as the height difference increases, while the number of the air cooling heat exchanger tubes increases. The transient analysis results show that after the SBO accident, a stable natural cooling circulation is established. The surface temperature of CPR1000 SFP increases continually until 80 C, which indicates that the design of the passive air cooling system for CPR1000 SFP is capable of removing the decay heat to maintain the temperature of the SFP around 80 C after losing the heat sink.

关键词：热工水力设计瞬态分析冷却系统乏燃料储存