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Empirical model for bio-extraction of copper from low grade ore using response surface methodology

Transactions of Nonferrous metals Society of China 2015年第12期25卷 4126-4143页

作者： m.YAGHOBI mOGHADDAm S.Z.SHAFAEI m.NOAPARAST F.DOULATI ARDEJANI H.ABDOLLAHI m.ranjbar m.SCHAFFIE Z.mANAFI School of mining College of Engineering University of Tehran Department of mining Engineering Shahid Bahonar University of Kerman Department of Chemical Engineering Shahid Bahonar University of Kerman Hydrometallurgy Research Unit R&D Center Sarcheshmeh Copper Mine Complex

The copper extraction in shaking bioreactors was modeled and optimized using response surface methodology（RSm）. Influential parameters in the mesophilic bioleaching process of a low-grade copper ore including p H value, pulp density, and initial concentration of ferrous ions were comprehensively studied. The effect of leaching time on the response（copper extraction） at the 1st, 4th, 9th, 14 th and 22 nd days of treatment was modeled and examined. The central composite design methodology（CCD） was used as the design matrix to predict the optimal level of these parameters. Then, the model equation at the 22 nd day was optimized using the quadratic programming（QP） to maximize the total copper extraction within the studied experimental range. Under the optimal condition（initial p H value of 2.0, pulp density of 1.59%, and initial concentration of ferrous ions of 0 g/L）, the total copper extraction predicted by the model is 85.98% which is significantly close to that obtained from the experiment（84.57%）. The results show that RSm could be useful to predict the maximum copper extraction from a low-grade ore and investigate the effects of variables on the final response. Besides, a couple of statistically significant interactions are derived between p H value and pulp density as well as p H value and initial ferrous ion concentration which are precisely interpreted. However, there is no statistically significant interaction between the initial ferrous ion concentration and the pulp density. Additionally, the response at optimal levels of p H value and pulp density is found to be independent on the level of initial ferrous concentration.

关键词： modeling optimization bacterial leaching response surface methodology copper extraction copper ore

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Numerical simulation of magnetic drug targeting with Eulerian-Lagrangian model and effect of viscosity modification due to diabetics

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Applied mathematics and mechanics(English Edition) 2016年第12期37卷 1631-1646页

作者： m.m.LARImI A.RAmIAR A.A.ranjbar Faculty of mechanical Engineering Babol Noshirvani University of Technology

The targeted drug delivery and targeted drug therapy transport a drug directly to the center of the disease under various conditions and thereby treat it deliber- ately without effects on the body. This paper studies the magnetic drug targeting （mDT） technique by particle tracking in the presence of magnetic field in bifurcation vessels of a healthy person and a diabetes patient. The Lagrangian particle tracking is performed to estimate particle behavior under effects of imposed magnetic field gradients along the bifurcation. The results show that the magnetic field increases the volume fraction of particle in the target region, and the efficiency of mDT on a patient with the diabetes disease is better than a healthy person. Also, for the higher magnetic numbers, the flow in the upper branch is strongly affected by the magnetic field.

关键词： bifurcation particle tracking Lagrangian method magnetic nano-particles

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Use of mesophilic and thermophilic bacteria for the improvement of copper extraction from a low-grade ore

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International Journal of minerals,metallurgy and materials 2011年第2期18卷 138-143页

作者： E.Darezereshki m.Schaffie m.Lotfalian S.A.Seiedbaghery m. ranjbar Department of mineral Processing Engineering Bahonar University Energy and Environmental Engineering Research Center (EERC) Bahonar University Department of Chemical Engineering Bahonar University Industrial mining Research Center (ImRC) Bahonar University Hydrometallurgy Research Unit R & D Center Sarcheshmeh Copper Complex

Bioleaching was examined for copper extraction from a low grade ore using mesophilic and moderate thermophilic bacteria. Five equal size columns were used for the leaching of the ore. Sulfuric acid solution with a flow rate of 3.12 L·m-2·h-1 and pH 1.5 passed through each column continuously for 90 d. In the first and the second column, bioleaching was performed without agglomeration of the ore and on the agglomerated ore, respectively. 28wt% of the copper was extracted in the first column after 40 d, while this figure was 38wt% in the second column. After 90 d, however, the overall extractions were almost the same for both of them. Bioleaching with mesophilic bacteria was performed in the third column without agglomeration of the ore and in the fourth column on the agglomerated ore. After 40 d, copper extractions in the third and the fourth columns were 62wt% and 70wt%, respectively. Copper extractions were 75wt% for both the columns after 90 d. For the last column, bioleaching was performed with moderate thermophilic bacteria and agglomerated ore. Copper extractions were 80wt% and 85wt% after 40 and 90 d, respectively. It was concluded that crushing and agglomeration of the ore using bacteria could enhance the copper extraction considerably.

关键词： bioleaching mesophilic bacteria thermopilic bacteria copper extraction agglomeration.

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Friction-stir-welded overaged 7020-T6 alloy joint: an investigation on the effect of rotational speed on the microstructure and mechanical properties

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International Journal of minerals,metallurgy and materials 2019年第5期26卷 622-633页

作者： m.Alipour Behzadi Khalil ranjbar R.Dehmolaei E.Bagherpour materials Science and Engineering Department Faculty of Engineering Shahid Chamran University of Ahvaz Department of mechanical Engineering Doshisha University

Commercial A7020-T6 plates in the overaged state were subjected to friction stir welding with four different tool rotational speeds of 500, 710, 1000, and 1400 r/min and a single traverse feed rate of 40 mm/min. The resultant changes in the welding heat input, microstructure, and the mechanical properties of the joints were investigated. The changes were related to the processes of growth, dissolution, and re-formation of precipitates. The precipitate evolution was examined by differential scanning calorimetry, and the microstructural analysis was conducted using optical, scanning, and transmission electron microscopes. The results showed that the grain size in the stirred zone(SZ) decreased substantially compared with the base metal, but increased with tool rotational speed because of the rise in temperature. We found that the width of the heat-affected zone increased with tool rotational speed. The hardness and the tensile strength in the SZ increased with increasing heat input compared with the base metal in the overaged condition. This recovery in mechanical properties of the joints can be attributed to the dissolution and re-formation of precipitates in the SZ and the thermomechanically affected zone. This process is referred to as an "auto-aging treatment."

关键词： A7020-T6 overaged friction stir welding precipitates rotational speed heat input auto-aging

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Leech therapy in treatment of cutaneous leishmaniasis:a case report

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Journal of Integrative medicine 2017年第5期15卷 407-410页

作者： Nasrin Hamidizadeh Amir Azizi mohammad m.Zarshenas Sara ranjbar molecular Dermatology Research Center Shiraz University of Medical SciencesShirazIran Research Center for Traditional medicine and History of medicine Shiraz University of Medical Sciences ShirazIran Departments of Phytopharmaceuticals(Traditional)Pharmacy School of PharmacyShiraz University of Medical SciencesShirazIran medicinal Plants Processing Research Center Shiraz University of Medical SciencesShirazIran

1 IntroductionApplication of leeches has been a common treatment measure since ancient times and descriptions can be found in the works of Pliny,Galen,Avicenna and Themison.

关键词： leeching leishmaniasis, cutaneous medicine, traditional

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Power transmission through double-walled laminated composite panels considering porous layer-air gap insulation

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Applied mathematics and mechanics(English Edition) 2014年第11期35卷 1447-1466页

作者： m.H.SHOJAEIFARD R.TALEBITOOTI B.ranjbar R.AHmADI School of mechanical Engineering Iran University of Science & Technology School of Automotive Engineering Iran University of Science & Technology

The acoustic behavior of double-walled laminated composite panels consisting of two porous and air gap middle layers is studied within the classical laminated plate theory （CLPT）. Thus, viscous and inertia coupling in a dynamic equation, as well as stress transfer, thermal and elastic coupling of porous material ave based on the Biot theory. In addition, the wave equations are extracted according to the vibration equation of composite layers. The transmission loss （TL） of the structure is then calculated by solving these equations simultaneously. Statistical energy analysis （SEA） is developed to divide the structure into specific subsystems, and power transmission is extracted with balancing power flow equations of the subsystems. Comparison between the present work and the results reported elsewhere shows excellent agreement. The results also indicate that, although favorable enhancement is seen in noise control particularly at high frequencies, the corresponding parameters associated with fluid phase and solid phase of the porous layer are important on TL according to the boundary condition interfaces. Finally, the influence of composite material and stacking sequence on power transmission is discussed.

关键词： laminated composite plate double panel sound transmission loss porousmaterial statistical energy analysis (SEA)

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Application of a characterized difference-frequency laser source to carbon monoxide trace detection

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Chinese Physics B 2012年第6期21卷 257-263页

作者： Alireza Khorsandi Zahra Shabani monireh ranjbar S. Ali Hoseinzadeh Salati Department of Physics University of Isfahan81746-73441 IsfahanIran

A tunable continuous wave（cw） mid-infrared（mIR） laser based on difference-frequency generation（DFG） in a 1.5-cm long AgGaS2 nonlinear crystal for trace gas detection is *** visible and near-infrared diode lasers were used as pump and signal *** mIR-DFG laser was tunable in a wavelength range of 4.75 μm-4.88 μ*** phase-matching（Pm） condition was non-critically achieved by adjusting the temperature of the crystal for fixed pairs of input pump and signal *** required Pm temperatures of the generated mIR-DFG wavelengths have been calculated by using three sets of recent Sellmeier equations and the temperature-dispersion equations of AgGaS2 given by Willer U,et al.（Willer U,Blanke T and Schade W 2001 ***.40 5439）.Then the calculated Pm temperatures are compared with the experimental *** performance of the mIR-DFG laser is shown by the trace detection of the P（16） carbon monoxide（12C16O） absorption line in a laboratory-fabricated absorption *** enhanced sensitivity of about 0.6×10 4 was obtained through the long path absorption provided by consecutive reflections between coated cylindrical mirrors of a constructed cell.

关键词： difference-frequency generation AgGaS2 crystal multi-pass cell

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microstructure and wear performance of Al5083/CeO_2/SiC mono and hybrid surface composites fabricated by friction stir processing

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Transactions of Nonferrous metals Society of China 2018年第5期28卷 866-878页

作者： m.AmRA Khalil ranjbar S.A.HOSSEINI Department of materials Science and Engineering Faculty of EngineeringShahid Chamran University of Ahvaz

Friction stir processing（FSP） was utilized to produce surface composites by incorporating nano-sized cerium oxide（CeO2） and silicon carbide（SiC） particles individually and in combined form into the Al5083 alloy matrix. The study signified the role of these reinforcements on microstructure and wear behavior of the resultant surface composite layers. The wear characteristics of the resultant mono and hybrid surface composite layers were investigated using a pin-on-disc wear tester at room temperature. The microstructural observations of FSPed regions and the worn out surfaces were performed by optical and scanning electron microscopy. Considerable grain refinement and uniform distribution of reinforcement particles were achieved inside the nugget zone. All the composite samples showed higher hardness and wear resistance compared to the base metal. Among the composite samples, the hybrid composite（Al5083/CeO2/SiC） revealed the highest wear resistance and the lowest friction coefficient, whereas the Al5083/SiC composite exhibited the highest hardness, i.e., 1.5 times as hard as that of the Al5083 base metal. The enhancement in wear behavior of the hybrid composites was attributed to the solid lubrication effect provided by CeO2 particles. The predominant wear mechanism was identified as severe adhesive in non-composite samples, which changed to abrasive wear and delamination in the presence of reinforcing particles.

关键词： A15083 alloy friction stir processing CeO2 SiC surface composites wear mechanism

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Design and implementation of a new portable hybrid solar atmospheric water-generation system

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Clean Energy 2022年第6期6卷 879-892页

作者： Nafise Shafeian A.A.ranjbar Tahereh B.Gorji Faculty of mechanical Engineering Noshirvani University of TechnologyBabolIran Department of mechanical Engineering Mazandaran Institute of TechnologyBabolIran

During recent years,atmospheric water generation(AWG)has garnered significant attention among researchers as a viable solution to the water-scarcity ***,AWG requires dehumidification,which includes two main principles of refrigeration and *** refrigeration methods,thermoelectric coolers are suitable and,among sorption methods,it is best to utilize desiccant materials with high sorption capacity and low heat *** the present study,a portable hybrid/integrated solar AWG system was designed and tested under realistic conditions of Babol,Iran(36.5387°N,52.6765°E)over four typical summer days between 14 and 31 August *** models(models A and B)were designed and ***,relative humidity,solar irradiance and water-production data were recorded to assess the system performance(*** ratio between the generated water and consumed power in ml/***)and economically analyse the *** on the results acquired,the maximum water production in the proposed configuration(acquired from model B)was 2.12 l/m^(2).day at an average relative humidity and a temperature of 52%and 36°C,*** desired AWG system had a system performance of 0.19 ml/***,annual water production of 774.4 l/m^(2),production cost of 0.0246$/l/m^(2)and a payback period of 1.19 years.

关键词： renewable energy solar energy hybrid AWG system TEC cooling sorption

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A Study on the Wear Behaviour of Dual Phase Steels

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Journal of materials Science & Technology 2007年第1期23卷 107-110页

作者： V.Abouei H.Saghafian Sh.Kheirandish Kh.ranjbar Department of metallurgy and materials Engineering Iran University of Science and TechnologyIran Shahid Chamran University Iran

Dual phase （DP） steels containing four different amounts of martensite ranging from 43 vol. pct to 81 vol. pct have been developed from 0.2 wt pct carbon steel by intercritical heat treatment at a fixed temperature of 780℃ with varying holding times followed by water quenching. Dry sliding wear tests have been conducted on DP steels using a pin- on-disk machine under different normal loads of 61.3, 68.5, 75.7 and 82.6 N and at a constant sliding speed of 1.20 m/s. At these loads, the mechanism of wear is primarily delamination, which has been confirmed by SEm micrographs of subsurface and wear debris of samples. Wear properties have been found to improve with the increase in martensite volume fraction in dual phase steels.

关键词： Wear Dual phase steel microstructure

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