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Statistical evaluation and optimization of zinc electrolyte hot purification process by Taguchi method

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Journal of Central South University 2015年第6期22卷 2066-2072页

作者： Bahram Behnajady javad moghaddam Materials and Metallurgical Engineering Department Advanced Material Research CentreSahand University of Technology Tabriz

The neutral zinc sulfate solution obtained from hydrometallurgical process of Angouran zinc concentrate has cadmium, nickel and cobalt impurities, that must be purified before electrowinning. Therefore, cadmium and nickel are usually cemented out by addition of zinc dust and remained nickel and cobalt cemented out at second stage with zinc powder and arsenic trioxide. In this research, a new approach is described for determination of effective parameters and optimization of zinc electrolyte hot purification process using statistical design of experiments. The Taguchi method based on orthogonal array design（OAD） has been used to arrange the experimental runs. The experimental conditions involved in the work are as follows： the temperature range of 70-90 ℃ for reaction temperature（T）, 30-90 min for reaction time（t）, 2-4 g/L for zinc powder mass concentration（M）, one to five series for zinc dust particle size distributions（S1-S5）, and 0.1-0.5 g/L（C） for arsenic trioxide mass concentration. Optimum conditions for hot purification obtained in this work are T4（85 ℃）, t4=75 min, M4=3.5 g/L, S4（Serie 4）, and C2=0.2 g/L.

关键词： taguchi method hot purification nickel cobalt arsenic trioxide

Green synthesis,characterization and physiological stability of gold nanoparticles from Stachys lavandulifolia Vahl extract

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Particuology 2015年第2期13卷 22-26页

作者： Pooriya Khademi-Azandehi javad moghaddam Materials Engineering Department Advanced Materials Research CenterSahand University of Technology

The synthesis of nontoxic stable gold nanoparticles is important for medical applications. An aqueous extract of the plant Stachys lavandulifolia Vahl was used to synthesize gold nanoparticles. This green method involved the S. lavandulifolia Vahl extract acting as a reducing and stabilizing agent. The nanoparticles were characterized by transmission electron microscopy, dynamic light scattering analysis and UV-vis absorption and Fourier transform-infrared spectroscopies. Stability under physiological conditions is important for medical applications. The stability of the nanoparticles was compared with that of conventional citrate-capped nanoparticles, under both synthetic and physiological conditions. The nanoparticles synthesized from the S. lavandulifolia Vahl extract were stable under physiological conditions, in contrast with conventional citrate-capped nanoparticles.

关键词： Gold nanoparticle Green synthesis Stachys lavanduli folia Vahl Physiological stability

A new approach to zinc–nickel separation using solution alkalinization method:application to a zinc plant residue

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Rare Metals 2020年第11期39卷 1341-1347页

作者： Mostafa Aghazadeh Ghomi javad moghaddam Naghi Parvini Ahmadi Materials and Metallurgical Engineering Department Advanced Materials Research CenterSahand University of TechnologyTabriz51335-1996Iran Materials and Metallurgical Engineering Department University of ZanjanZanjan45371-38791Iran

The present investigation involves the separation of zinc and nickel from a sulfate solution using the acidic leaching of zinc plant residue after cadmium removal step as precursor(42.88 wt%Zn,8.50 wt%Cd and 2.33 wt%Ni).Separation of nickel from the solution was done by pouring it into a strong alkaline sodium hydroxide solution due to precipitation of nickel hydroxide and conversion of zinc to the soluble Zn(OH)_(4)^(2-)*** degrees of separation were reached by pouring more diluted solutions into the stronger alkaline *** clear pursue of the process,design of experimental methodology was applied for *** different washing steps on nickel-rich precipitates shows that the washing process decreases zinc content and thereby increases overall selectivity *** show that,at the optimized condition,Ni/Zn weight ratio in the solid product becomes about 104 times higher than the initial ratio in the initial feed solution and a nickel concentrate with 29.98 wt%Ni and 5.99 wt%Zn is *** the same time,the chemical analysis of filtrate shows only 4.4 mg·L^(-1)Ni in the alkaline zinc solution,which means that over 99%nickel is *** study on changes of zinc concentration with time shows that the process could be completed only after few minutes.

关键词： Zinc Nickel Precipitation Separation Alkalinization

Simple separation method of Zn(Ⅱ) and Cd(Ⅱ) from brine solution of zinc plant residue and synthetic chloride media using solvent extraction

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1055-1061页

作者： Ali Asghar Balesini Aghdam Hossein Yoozbashizadeh javad moghaddam Department of Materials Engineering Science and Research BranchIslamic Azad UniversityTehranIran Materials and Metallurgical Engineering Department University of ZanjanZanjanIran

In this work,the possibility of separation of Zn^2+and Cd^2+metal ions from chloride(brine)solutions was *** this purpose,simple solvent extraction(SX)experiments by di-2-ethylhexyl phosphoric acid(D2EHPA)in kerosene as a diluent was performed on synthetic and industrial chloride solution obtained from brine leaching of zinc filter cakes(by-product of zinc hydrometallurgical processing).The optimal conditions for separation were *** zinc extraction efficiency was 99%with negligible co-extraction of ***,a highΔpH0.5 value for Zn(Ⅱ)and Cd(Ⅱ)was ***-IR and slope analysis indicated that ZnClA·3HA and CdClA·3HA species were probably extracted.

关键词： Solvent extraction Brine media Leaching filter cakes Zinc Cadmium

The Influence of Morphology on Photo-catalytic Activity and Optical Properties of Nanocrystalline ZnO Powder

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Nano-Micro Letters 2012年第4期4卷 197-201页

作者： javad moghaddam Sara Mollaesmail Saeed Karimi Materials and Metallurgical Engineering Department Advanced Materials Research Center Sahand University of Technology School of Metallurgy and Materials Engineering University of Tehran

ZnO nano-particles were synthesized via an ammonical ammonium carbonate solution by precipitation method in presence of some additives such as urea, oleic and stearic acid. The morphology and crystallinity of the obtained zinc oxide particles depend critically on the type of additive which was used. Additives also affected the crystal orientation of precipitate nano-particles. SEM, XRD, BET and UV-visible were used to characterize morphology, microstructure, specific surface area and optical properties of the ***-catalysis properties of the as-prepared ZnO powders were evaluated by degradation of methyl red(acid red) in aqueous solution exposed to UV-light. Results suggested a close relationship among the morphology,size and surface area on photo-catalysis and optical properties of the particles. The widest Egvalue(3.56 e V),highest degradation and decolorization efficiency(99%) were obtained from a sample with the smallest grain size(largest surface area) which were used urea as an additive.

关键词： Nano-particles ZnO Precipitation method Optical properties Photocatalytic activity

Kinetics of zinc sulfide concentrate direct leaching in pilot plant scale and development of semi-empirical model

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Transactions of Nonferrous Metals Society of China 2017年第10期27卷 2272-2281页

作者： Nima SADEGHI javad moghaddam Mehdi OJAGHI ILKHCHI Faculty of Materials Engineering Sahand University of Technology Tabriz Iran Materials and Metallurgical Department University of Zanjan Zanjan Iran

The direct leaching kinetics of an iron-poor zinc sulfide concentrate in the tubular reactor was *** tests werecarried out in the pilot *** allow the execution of hydrostatic pressure condition,the slurry with ferrous sulfate and sulfuric acidsolution was filled into a vertical tube(9m in height)and air was blown from the bottom of the *** effects of initial acidconcentration,temperature,particle size,initial zinc sulfate concentration,pulp density and the concentration of Fe on the leachingkinetics were *** of the kinetic analysis indicate that direct leaching of zinc sulfide concentrate follows shrinkingcore model(SCM).This process was controlled by a chemical reaction with the apparent activation energy of49.7kJ/***,a semi-empirical equation is obtained,showing that the order of the iron,sulfuric acid and zinc sulfate concentrationsand particle radius are0.982,0.189,-0.097and-0.992,*** of the unreacted and reacted sulfide particles bySEM-EDS shows that insensitive agitation in the reactor causes detachment of the sulfur layer from the particles surface in lowerthan60%Zn conversion and lixiviant in the face with sphalerite particles.

关键词： kinetics direct leaching sphalerite shrinking core model (SCM) pilot plant

Enhanced selectivity of hydrolytic precipitation of Zn from Zn-Ni sulfate solution via chelation of Ni

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Transactions of Nonferrous Metals Society of China 2018年第12期28卷 2566-2573页

作者： Mostafa Aghazadeh-Ghomi javad moghaddam Naghi Parvini Ahmadi Department of Materials Engineering Azarbaijan Shahid Madani University Materials and Metallurgical Engineering department University of Zanjan Faculty of Materials Engineering Sahand University of Technology

The selective precipitation of zinc from zinc-nickel sulfate solution with the Zn/Ni molar ratio of20:1was *** addition of0.5mol/L NaOH solution into the zinc-nickel sulfate solution containing0,0.01,0.02,0.03and0.04mol/L ethylene diamine tetraacetate(EDTA)as a chelating agent was *** equilibrium analysis of precipitation pathway was performed using Visual MINTEQ *** equilibrium analysis showed that the presence of small amounts of EDTA can prevent nickel precipitation in alkaline conditions without any negative effect on zinc *** this basis,more than90%of zinc could be precipitated as a product with about50%Zn and only0.11%Ni at pH=9.0merely as a result of the presence of0.03mol/L EDTA in the *** stirring time of120min after precipitation was found to be essential for more complete *** X-ray diffraction studies on the precipitate revealed that the precipitated phase was Zn4(OH)6SO4.4H2O.

关键词： zinc nickel hydrolytic precipitation separation chelate equilibrium analysis

Stochastic Security-constrained Unit Commitment Considering Electric Vehicles, Energy Storage Systems, and Flexible Loads with Renewable Energy Resources

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Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1405-1414页

作者： Ali Gholami Trojani Mahmoud Samiei moghaddam javad Mohamadi Baigi Electrical Engineering Department Damghan BranchIslamic Azad UniversityDamghamIran

In this paper, a new formulation for modeling the problem of stochastic security-constrained unit commitment along with optimal charging and discharging of large-scale electric vehicles, energy storage systems, and flexible loads with renewable energy resources is presented. The uncertainty of renewable energy resources is considered as a scenario-based model. In this paper, a multi-objective function which considers the reduction of operation cost, no-load and startup/shutdown costs, unserved load cost, load shifting, carbon emission, optimal charging and discharging of energy storage systems, and power curtailment of renewable energy resources is considered. The proposed formulation is a mixed-integer linear programming(MILP) model, of which the optimal global solution is guaranteed by commercial solvers. To validate the proposed formulation, several cases and networks are considered for analysis, and the results demonstrate the efficiency.

关键词： Electric vehicle energy storage system flexible load renewable energy resource unit commitment

Effects of Eriobotrya japonica(Lindl.) flower extracts on mercuric chloride-induced hepatotoxicity in rats

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Chinese Science Bulletin 2012年第30期57卷 3891-3897页

作者： ESMAEILI Amir Hossein KHAVARI-NEJAD Ramazan Ali HAJIZADEH moghaddam Akbar CHAICHI Mohammad javad EBRAHIMZADEH Mohammad Ali Department of Biology Science and Research BranchIslamic Azad UniversityBox 14515-775TehranIran Faculty of Basic Science University of MazandaranBox 47416-95448BabolsarIran Faculty of Chemistry University of MazandaranBox 47416-95447BabolsarIran Pharmaceutical Sciences Research Center School of PharmacyMazandaran University of Medical SciencesSari 48189Iran

Mercury(II) is an important factor in hepatotoxicity that can enter the body through marine diets and *** the present study,the protective effect of the Eriobotrya japonica flower extract(EJFE) on HgCl 2-induced hepatotoxicity was *** mg/kg of mercuric chloride in drinking water was given to rats either with saline or EJFE(100 and 200 mg/kg as intraperitoneal(IP)) for 30 *** mercury levels in different groups of liver tissues of the rats were measured with flameless atomic absorption spectroscopy(F-AAS).Also,mercury accumulation in the liver of the rats was modeled by using a parallel chemical kinetic *** results showed that HgCl 2-induced oxidative damage led to a significant decrease in glutathione(GSH) and the total antioxidant capacity(TAC) levels,and to a significant increase in lipid peroxidation *** mercury was 14.47% more in the livers of the stress groups than in those of the control groups(P<0.001),whereas the amount of Hg was adjusted to 13.49% and 13.93% in groups treated with 100 and 200 mg/kg of EJFE respectively,as compared with stress groups(P<0.001).HPLC analysis of EJFE revealed that hesperetin and gallic acid are the major antioxidants in *** demonstrate that flowers of the Eriobotrya japonica cause a significant protection against HgCl 2 induced hepatotoxicity in all diagnostic parameters by strengthening the antioxidant defense mechanisms and they may have a therapeutic function in free radical mediated diseases.

关键词：氯化汞大鼠肝提取物枇杷诱导火焰原子吸收光谱法总抗氧化能力化学动力学模型