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A novel electrolytic-manganese-residues-and-serpentine-based composite(S-EMR) for enhanced Cd(Ⅱ) and Pb(Ⅱ) adsorption in aquatic environment

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Rare Metals 2023年第1期42卷 346-358页

作者： Meng-Yu Ma Xuan Ke Yan-Chang Liu Zhi-Hao Ha Ting Wang Jia Li Fan Zhang Tian C.Zhang College of Resources and Environmental Science South-Central Minzu UniversityWuhan430074China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan430074China College of Engineering University of Nebraska-LincolnOmahaNE68182USA

Electrolytic manganese residue(EMR) is the waste slag generated from the electrolysis manganese *** a promising exploitable adsorbent,EMR has become a hot research ***,EMR’s low adsorption capacity has limited its applications as an efficient *** this study,the EMR was mixed with serpentine and calcined(at 800℃ for 2 h) to prepare a composite adsorbent(S-EMR) with its specific surface area of 11.998 m^(2)·g^(-1)(increased compared to the original EMR) and improved adsorption capacities for Cd^(2+)(98.05 mg·g^(-1)) and Pb^(2+)(565.81 mg·g^(-1)).Kinetic studies have shown that the pseudo-first-order kinetics(PSO)model could best describe the adsorption kinetics of S-EMR for Cd^(2+)/Pb^(2+),implying that the chemisorption process is the rate-limiting *** effects of different interfering ions on S-EMR’ s adsorption for Cd^(2+)/Pb^(2+)may be due to the difference in their *** of response surface methodology tests showed that pH had the highest influence on adsorption,and the removal efficiency of S-EMR reached 99.92% for Cd(Ⅱ) and 94.00%for Pb(Ⅱ).X-ray photoelectron spectroscopy(XPS) analyses revealed that chemical precipitation was the predominant mechanism for Cd^(2+)/Pb^(2+)removal,and the adsorption mechanisms were associated with ion exchange and electrostatic *** results showed that S-EMR could be used as an effective adsorbent for the removal of Cd(Ⅱ)/Pb(Ⅱ) from water bodies,rendering dual benefits of pollution control and resource recovery.

关键词： Cadmium Lead Electrolytic manganese residue serpentine Heavy metals

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Devise of a W serpentine shape tube heat exchanger in a hard chromium electroplating process

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Chinese Journal of Chemical Engineering 2019年第1期27卷 218-225页

作者： Surasit Tanthadiloke Paisan Kittisupakorn Pannee Boriboonsri Iqbal M.Mujtaba Department of Chemical Engineering Faculty of EngineeringChulalongkorn University School of Engineering University of Bradford

In a hard chromium electroplating process, a heat exchanger is employed to remove the heat produced from the high current intensity in an electroplating ***, a conventional U shape heat exchanger is installed in the bath, but it provides low heat ***, this study designs a novel W serpentine shape heat exchanger with identical heat transfer area to the conventional one for increasing heat removal *** performance of the heat exchange is tested with various flow velocities in a cross-section in range of 1.6 to 2.4 m·s^(-1).Mathematical models of this process have been formulated in order to simulate and evaluate the heat exchanger *** results show that the developed models give a good prediction of the plating solution and cooling water temperature, and the novel heat exchanger provides better results at any flow *** addition, the W serpentine shape heat exchanger has been implemented in a real hard chromium electroplating *** data collected have shown that the new design gives higher heat removal performance compared with the U shape heat exchanger with identical heat transfer area; it removes more heat out of the process than the conventional one of about 23%.

关键词： W serpentine shape Hard chromium electroplating Mathematical modeling Simulation Heat exchanger

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Mechanism of Mg2+ dissolution from olivine and serpentine: Implication for bioleaching of high-magnesium nickel sulfide ore at elevated pH

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1069-1079页

作者： Jian-zhi Sun Jian-kang Wen Bo-wei Chen Biao Wu National Engineering Laboratory of Biohydrometallurgy GRINM Group Corporation Limited

To inhibit the dissolution of Mg^2+ during the bioleaching process of high-magnesium nickel sulfide ore, the effect of major bioleaching factors on the dissolution of Mg^2+ from olivine and serpentine was investigated and kinetics studies were carried out. The results indicated that the dissolution rate-controlling steps are chemical reaction for olivine and internal diffusion for serpentine. The most influential factor on the dissolution of Mg^2+ from olivine and serpentine was temperature, followed by p H and particle size. A novel method of bioleaching at elevated pH was used in the bioleaching of Jinchuan ore. The results showed that elevated pH could significantly reduce the dissolution of Mg^2+ and acid consumption along with slightly influencing the leaching efficiencies of nickel and cobalt. A model was used to explain the leaching behaviors of high-magnesium nickel sulfide ore in different bioleaching systems. The model suggested that olivine will be depleted eventually, whereas serpentine will remain because of the difference in the rate-controlling steps. Bioleaching at elevated pH is a suitable method for treating high-magnesium nickel sulfide ores.

关键词： olivine serpentine high-magnesium nickel sulfide ore bioleaching shrinking core model elevated pH

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Determination of serpentine dehydration temperature at 1- 5 GPa by the method of electrical conductivity

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Chinese Science Bulletin 1996年第21期41卷 1815-1819页

作者：宋茂双谢鸿森郑海飞郭捷徐有生许祖鸣 Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Department of Geology Peking University Beijing 100871China

The stable fields of hydrous minerals are very important for us to inquire into dia-genesis,magmatism,metamorphic evolution and geochemical process of subduction *** now,the dehydration temperatures of hydrous mineral... 详细信息

关键词： high temperature and high pressure serpentine electrical conductivity dehydration temperature.

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Tensile properties and microstructure of rheo-diecast 7075 alloy prepared by serpentine channel process

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China Foundry 2019年第3期16卷 161-167页

作者： Wei-min Mao Wen-zhi Zhu School of Materials Science and Engineering University of Science & Technology Beijing Beijing 100083 China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science & Technology Wuhan 430074 China

A semisolid slurry of 7075 aluminum alloy was prepared by means of a serpentine channel process (SCP) and rheo-diecasting. The influences of pouring temperature during slurry preparation, the injection pressure and die preheat temperature on the mechanical properties and microstructure of a rheo-diecast 7075 aluminum alloy were investigated. The results show that the as-cast strength and elongation of the tensile samples were 210-260 MPa and 0.2%-1.7%, respectively, with an injection pressure of 130 MPa, a pouring temperature of 700-720℃, a preheat temperature of 280-350℃, and a plunger speed of 0.5 m·S^-1. The results also show that the aged strength and elongation of the tensile samples were 420-453 MPa and 1.0%-1.4%, respectively, when the alloy solution was treated at 470℃ for 12 h and aged at 120℃ for 24 h. The substantial shrinkage porosity in the 7075 aluminum alloy tensile samples was the main cause of low elongation.

关键词： serpentine channel rheo-die casting 7075 aluminum alloy microstructure tensile properties

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Preparation of Al-Zn-Mg-Cu alloy semisolid slurry through a water-cooled serpentine pouring channel

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China Foundry 2019年第1期16卷 31-39页

作者： Wen-zhi Zhu Wei-min Mao Qing-song Wei Chen Hui Yu-sheng Shi State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

The semisolid slurry of Al-Zn-Mg-Cu alloy was prepared through a self-designed water-cooled copper serpentine pouring channel(WSPC) machine. Influences of pouring temperature, the number of turns and the cooling water flow rate on the microstructure of the semisolid Al-Zn-Mg-Cu alloy slurry were investigated. The results show that the semisolid Al-Zn-Mg-Cu alloy slurry with satisfactory quality can be generated by the WSPC when the pouring temperature is in the range between 680 ℃ and 700 ℃. At a given pouring temperature, the average grain size of primary α-Al decreases and the shape factor increases with the increase of the number of turns. When the cooling water flow rate is 450 L·h^(-1), the obtained semisolid slurry is optimal. During the preparation of the semisolid Al-Zn-Mg-Cu alloy slurry with low superheat pouring, the alloy melt has mixed inhibition and convection flow characteristics by "self-stirring". When the alloy melt flows through the serpentine channel, the chilling effect of the inner wall of the channel, the convection and mixed inhibition of the alloy melt greatly promote the heterogeneous nucleation and grain segregation. This effect destroys the dendrite growth mode under traditional solidification conditions, and the primary nuclei gradually evolve into spherical or nearspherical grains.

关键词： Al-Zn-Mg-Cu Alloy semisolid slurry water-cooled serpentine channel primary α-Al

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Electrical conductivity measurement of serpentine at high temperature and pressure

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Chinese Science Bulletin 1999年第20期44卷 1903-1907页

作者： Maoxu Zhu Hongsen Xie Jie Guo Yueming Zhang Zurning Xu Chinese Acad Sci Inst Geochem Guiyang 550002 Peoples R China

The electrical conductivity of serpentine is measured at 1.0-3.0 GPa and 300-870℃. The effect of frequencies on electrical conductivity measurement is analyzed. The conduction mechanisms of serpentine before and after dehydration are discussed. Our experimental results show that the electrical conductivity of serpentine increases significantly after

关键词： high temperature and pressure serpentine electrical conductivity dehydration.

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serpentine Jade(Bowenite) in Korea

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Journal of Earth Science 2000年第2期19卷 11-14页

作者： Kim Won Sa Department of Geology, Chungnam National University, Taejon 305-764, Korea

A bowenite deposit, recently discovered in Booyo County, Republic of Korea, is the first of its kind in the country. This deposit is located along the contacts of garnet veins intruding the serpentinite. The bowenite is translucent, dark green in color, greasy in luster, 5 in Mohs ’ scale of hardness, ～2.57 in SG , 2.58 in RI , and 1.56 in N D . The X ray powder diffraction analysis identified the bowenite as antigorite of the serpentine group minerals, whose major chemical compositions are composed of SiO 2 (42.49 %), MgO (39.08 %), Fe 2O 3 (3.85 %), and H 2O (11.87 %) and whose important trace elements include Cr (2 188×10 -6 ), Ni (1 110×10 -6 ), and Co (58×10 -6 ). The IR spectrum shows the absorptions at 3 670 (OH stretching), 1 190, 1 070, 980 (SiO stretching) and 610 cm -1 (OH bending). The DTA/TGA thermogram shows the peaks at 343, 755 and 830.1 ℃. The endothermic reaction at 755 ℃ denotes expulsion of structural water, and the strong exothermal reaction at 830.1 ℃ is related to the formation of olivine. Black inclusions finely dispersed in the mineral are identified, with X ray Gandolfi camera method, as magnetite.

关键词： bowenite serpentine serpentinite Booyo Korea.

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Giant serpentine Cerebral Aneurysm of the Middle Cerebral Artery: Case Report

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Open Journal of Medical Imaging 2017年第1期7卷 9-16页

作者： Abdulrahman M. Al Shamy Mohammed D. Alsahafi Muhammed A. Alghamdi Abdullah A. Alshamrani Roaa N. Filfilan Radiology Department KAMC-NG Jeddah KSA College of Medicine Umm Alqura University Makkah KSA

A 43-year-old male presented with severe intermittent headaches since two years accompanied by multiple episodes of generalized seizures and left hand weakness. MRI scan and cerebral angiography confirmed the diagnosis of a giant serpentine cerebral aneurysm arising from the middle cerebral artery. The patient was admitted for a possible cerebral embolization after undergoing a Balloon Occlusion Test (BOT). Since he tolerated the occlusion test, he underwent coil embolization afterwards with successful occlusion followed by an uneventful recovery and no complications. Later on, the patient was discharged home in a stable and good general condition without any neurological deficits. A six-month angiography follow-up revealed a complete occlusion with no re-canalization of the coiled giant serpentine aneurysm. Therefore, we concluded that parent artery occlusion is a good and safe procedure providing that the patient tolerated both the occlusion and the hemodynamic stress tests.

关键词： Aneurysm Giant Interventional Neuroradiology Giant serpentine Aneurysm Balloon Occlusion Test Parent Artery Sacrifice Coil Embolization Endovascular

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Giant serpentine Aneurysm Treated with Double EC-IC Bypass with Thrombectomy and Excision of Aneurysm: A Case Review and Technical Note

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Open Journal of Modern Neurosurgery 2013年第3期3卷 29-32页

作者： Paul E. Kaloostian Han Chen Howard Yonas Johns Hopkins University Medical Center Baltimore USA University of New Mexico Neurological Surgery Albuquerque USA

Objective and Importance: The authors report a case of a symptomatic giant serpentine MCA aneurysm treated with double STA-MCA bypass with thrombectomy and excision of aneurysm. This is the first reported case of a double bypass with concomitant thrombectomy and excision of aneurysmal segment. Clinical Presentation/Methods: We report the case of a 27-year-old Hispanic male with severe acute decline in mental status with a giant serpentine MCA aneurysm with significant mass effect and midline shift trapping the lateral ventricular system. Intervention/Results: Patient presented initially to an outside hospital for altered mental status and confusion. Patient was diagnosed with a giant serpiginous aneurysm and hydrocephalus. A left ventriculoperitoneal shunt was placed at the outside hospital and patient was transferred to University of New Mexico. At this time, his mental status declined rather abruptly. He was treated with a double STA-MCA bypass procedure with aneurysm resection.

关键词： Double Bypass STA-MCA serpentine Aneurysm Resection Thrombectomy

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