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| 1 | Effects of nanobubble and hydrodynamic parameters on coarse quartz flotation显示文摘Quartz, the second most abundant mineral in the earth's crust, is a gangue mineral in practically every flotation process. Coarse quartz flotation has been a long standing problem in various mineral processing plants to reduce milling cost and increase valuable mineral recovery. Based on this, the effects of nanobubbles(NBs) and hydrodynamic parameters on coarse quartz particle flotation were systematically investigated. Mechanical flotation experiments were carried out using the 7 cm and 9 cm diameter impellers in order to produce different hydrodynamic conditions. 900–1300 rpm impeller speeds were used for the 7 cm diameter impeller and 554–786 rpm for the 9 cm diameter impeller. The results show that the presence of NBs increased the flotation recovery of à425 + 106 lm quartz by up to 21%. For the7 cm diameter impeller, the maximum flotation recoveries of 86.4% and 98% were obtained in the absence and presence of NBs at Reynolds number(Re) of 81,000 and 66,000, respectively. For the 9 cm diameter impeller, the maximum recoveries of 86.3% and 97.5% were obtained in the absence and presence of NBs at Re of 90,000 and 75,000, respectively. NBs increased the flotation rate constant up to 36%. | Sabereh Nazari Sied Ziaedin Shafaei Mahdi Gharabaghi Rahman Ahmadi Behzad Shahbazi Fan Maoming | 2019 | International Journal of Mining Science and Technology2019，29，2： | 10 |
| 2 | Bonded-particle model calibration using response surface methodology显示文摘 | Sajjad Chehreghani Mohammad Noaparast Bahram Rezai Sied Ziaedin Shafaei | 2017 | Particuology2017，15，3： | 6 |
| 3 | 从含Cu,Ni,Fe和Zn离子的Sarcheshmeh铜矿合成及工业溶液中萃取和反萃Cu和Ni(英文)显示文摘以D2EHPA、LIX 984、Cyanex 302、Chemorex CP 150和Acorga 5774为萃取剂,煤油为稀释剂,对取自Sarcheshmeh铜矿含Cu(770mg/L)、Ni(3200mg/L)、Fe(800mg/L)和Zn(200mg/L)的合成及工业溶液中Cu和Ni的萃取与反萃进行全面研究。萃取阶段考虑的影响因素有混合速度和时间、萃取剂浓度、p H和温度。此外,采用不同浓度的各种无机和有机酸(硫酸、盐酸、硝酸和柠檬酸)对Cu和Ni进行反萃。结果表明,在时间为3 min、混合速度为500 r/min、温度为28℃以及A/O比为1:1的条件下,Cu和Ni的萃取率最高。此外,用10%(v/v)LIX984可有效萃取Cu,而用30%(v/v)Cyanex 302可有效萃取Ni。萃取Cu和Ni的最佳p H分别为2~3和4~5。从含Ni、Cu、Zn和Fe离子的合成及工业溶液中可选择性萃取Cu和Ni,其萃取率分别为85%、93%和77%、82%。最佳条件实验结果表明,合成及工业溶液中Ni的反萃率达96%,Cu的反萃率为93%。最后,分别用D2EHPA、LIX 984和Cyanex 3023种萃取剂分3个阶段萃取Zn、Fe、Cu和Ni 4种元素,而杂质萃取率最低。 | Amirhossein SOEEZI Hadi ABDOLLAHI Sied Ziaedin SHAFAEI Esmaeil RAHIMI | 2020 | Transactions of Nonferrous Metals Society of China2020，30，2： | 6 |
| 4 | Modeling and process optimization for microbial desulfurization of coal by using a two-level full factorial design显示文摘The microbial sulfur removal was investigated on high sulfur content (1.9%) coal concentrate from Tabas coal preparation plant. A mixed culture of ferrooxidans microorganisms was isolated from the tailing dam of the plant. Full factorial method was used to design laboratory test and to evaluate the effects of pH, particle size, iron sulfate concentration, pulp density, and bioleaching time on sulfur reduction. Statistical analyses of experimental data were considered and showed increases of pH and particle size had negative effects on sulfur reduction, whereas increases of pulp density and bioleaching time raised microbial desulfurization rate. According to results of designing, and regarding statistical factors, the optimum values for maximum sulfur reduction were obtained; pH (1.5), particle size (-180 μm), iron sulfate concentration (2.7 mmol/L), pulp density (10%) and bioleaching time (14 d), which leaded to 51.5% reduction from the total sulfur of sample. | Golshani T. Jorjani E. Chelgani S. Chehreh Shafaei S.Z. Nafechi Y. Heidari | 2013 | International Journal of Mining Science and Technology2013，23，2： | 5 |
| 5 | 采用响应面方法和中心复合旋转设计对低品位锰矿浸出过程建模与优化(英文)显示文摘采用实验设计软件对从低品位锰矿中浸出提取锰的过程进行优化。在中心复合响应面实验设计中,考察了4个主要影响浸出过程的参数,即硫酸浓度、草酸浓度、浸出时间和温度。将锰和铁的浸出率作为考察指标。采用统计分析和方差分析确定了最优条件,即最高的锰和铁浸出率、最短的浸出时间和最低的温度。结果表明,硫酸浓度是影响浸出过程的最显著的参数,在最优条件下:硫酸浓度7%,草酸浓度42.5g/L,浸出时间60min,反应温度65℃,锰和铁的浸出率可分别达到93.44%和15.72%。 | Dariush AZIZI Sied Ziaedin SHAFAEI Mohammad NOAPARAST Hadi ABDOLLAHI | 2012 | Transactions of Nonferrous Metals Society of China2012，22，9： | 5 |
| 6 | Experimental study on local scour around single oblong pier fitted with a collar in a 180 degree flume bend显示文摘In this work, investigation on the development of local scour around an oblong pier in a 180 degree flume bend is presented. Scour hole can cause failure of the bridge especially during the river floods. In this study, the use of oblong collars for reducing the effects of local scour at a bridge pier is presented together with the time aspect of the scour development. Tests were conducted using one oblong pier in positions of 60degree under one flow conditions. The study was conducted using a physical hydraulic model operated under clear-water conditions in cohesionless bed material. In this study, the time development of the local scour around the oblong pier fitted with and without collar plates was studied. Investigated was the effect of size and elevation collar on the time development of scour and its efficacy at preventing scour at a bridge pier. The time development of the scour hole around the model pier with and without a collar installed was compared with similar studies on bridge piers. The results of the model study indicated that the maximum depth of scour is highly dependent on the experimental duration. It was observed that, as the minimum depth of scour occurs for the square collar at width of 3B placed at elevation of 0.1B below the bed and the size of a collar plate increases, the scour decreases. Measuring depth of scouring based on experimental observation, an empirical relation is developed with regression coefficient 95%. | Alireza MASJEDI Mahmood SHAFaEI BEJESTAN Abdolkarim ESFANDI | 2010 | International Journal of Sediment Research2010，25，3： | 4 |
| 7 | Removal of copper from molybdenite concentrate by mesophilic and extreme thermophilic microorganisms显示文摘Mixed mesophilic and extreme thermophilic bioleaching were evaluated to remove copper from the molybdenite concentrate.Bioleaching tests were carried out in shake flasks and in a 50-L bioreactor.The shake flask tests were performed with different inoculum size,solids density,pH.and temperature in order to identify optimum conditions.The highest amount of copper elimination,75%was obtained with extreme thermophilic microorganisms(at 12%inoculation,10%solids,65℃and a pH of 1.5).The highest copper elimination by mesophilic microorganisms was 55%(at 12%inoculation,5%solids,30℃at pH 2).The optimum conditions in shake flask tests were applied to 7 days batch tests in a50-L bioreactor.Extreme thermophilic experiment gave the best copper elimination of 60%(at 12%inoculation,10%solids,65℃and pH 1.5).Mesophilic test removed 50%of the copper(at 12%inoculation,10%solids,35℃at pH 2). | Abdollahi Hadi Manafi Zahra Shafaei Sied Ziaedin Noaparast Mohammad Manafi Moorkani Navid | 2013 | International Journal of Mining Science and Technology2013，23，6： | 4 |
| 8 | Modeling the effects of ore properties on water recovery in the thickening process显示文摘A better understanding of solid-liquid separation would assist in improving the thickening performance and perhaps water recovery as well. The present work aimed to develop an empirical model to study the effects of ore properties on the thickening process based on pilot tests using a column. A hydro-cyclone was used to prepare the required samples for the experiments. The model significantly predicted the experimental underflow solid content using a regression equation at a given solid flux and bed level for different samples, indicating that ore properties are the effective parameters in the thickening process. This work confirmed that the water recovery would be increased about 5% by separating the feed into two parts, overflow and underflow, and introducing two different thickeners into them separately. This is duo to the fact that thickeners are limited by permeability and compressibility in operating conditions. | Majid Unesi Mohammad Noaparast Seiyd Ziaedin Shafaei Esmaeil Jorjani | 2014 | International Journal of Minerals,Metallurgy and Materials2014，21，9： | 4 |
| 9 | Nickel extraction from low grade laterite by agitation leaching at atmospheric pressure显示文摘This research work deals with the extraction of nickel from a low grade nickel laterite ore, taken from a deposit located in southwestern of Iran, through agitation leaching at atmospheric pressure. The assaying and mineralogical studies carried out on the nickel laterite sample, showed the 0.88% Ni, and principally consisted of oxide and silicate crystalline phases i.e. dolomite, quartz, magnetite, and goethite. Among numerous factors affecting such process, four major parameters i.e. temperature, agitator speed(r/min), leaching agents and their concentration were considered in a two-level full factorial experimental design. The agitation leach tests showed that the ore could be leached at atmospheric pressure with sulfuric acid while citric acid was almost unpromising. Analysis of variance(ANOVA) using DX7 software was employed to identify effective parameters. Sulfuric acid concentration and temperature were the most effective parameters on Ni extraction. Furthermore, the factorial models for experiment responses were developed. The results showed 83% Ni extraction after 4 h leaching, under optimized conditions i.e.temperature at 95 ℃, acid concentration at 5 N and agitator speed at 1000 r/min. This study revealed that factorial experimental design can be implemented to identify effective parameters on the agitation leaching process of nickel laterite. | Fatahi Mohammadreza Noaparast Mohammad Shafaei Seyyed Ziaeddin | 2014 | International Journal of Mining Science and Technology2014，24，4： | 3 |
| 10 | Dual effects of sodium sulfide on the flotation behavior of chalcopyrite:Ⅰ. Effect of pulp potential显示文摘This study explores the flotation behavior of chalcopyrite in the presence of different concentrations of sodium sulfide(Na2S·9H2O) at pH 12 under controlled potential conditions.It was observed that the flotation of chalcopyrite is not depressed completely when the pulp potential is low,even at high concentrations of sodium sulfide,i.e.,10-1–10-2 mol/L.However,a partial and controlled oxidation of pulp does enhance the effectiveness of sodium sulfide on the depression of chalcopyrite.Characterization of the chalcopyrite particle surface by X-ray photoelectron spectroscopy allowed the identification of hydrophilic and hydrophobic surface species,which are responsible for the depression and flotation of chalcopyrite.Changes in pulp potential were found to be an effective float controlling parameter,by which Na2S can be used to initiate or depress the flotation behavior of chalcopyrite. | Bijan Taheri Mahmoud Abdollahy Sied Ziaedin Shafaei Tonkaboni Soheyla Javadian Mohammadreza Yarahmadi | 2014 | International Journal of Minerals,Metallurgy and Materials2014，21，5： | 3 |
| 11 | Coal washing improvement by determination of optimal mixture of feed blends显示文摘Coals from different mines are feed in the Zirab plant without any control on weight percentage blending of them. Three major coal types of different ranks (Kiasar, Lavidj and Karmozd) were blended in various proportions to find an optimum condition in flotation circuit in Alborz Markazi coal washing plant. Flotation tests were conducted for prepared blended coal samples to assess floatability of various coal samples. In this paper, mixture design as a statistical method was used to optimize coal blend to increase recovery and grade in Zirab coal washing plant. The statistical analysis showed that the weight percent blending of different coals and interaction between Lavidj and Karmozd regions coal had significant effects on the coal recovery. The optimum condition of 95% recovery and 12% ash content could be reached with 10%, 20%, and 70% blending portion of Kiasar, Lavidj and Karmozd regions coal, respectively. | Bahri Zahra Shafaei Seyyed Ziaoddin Kor Mohammad Sereshki Farhanga | 2011 | Mining Science and Technology2011，21，6： | 2 |
| 12 | Mesuaferrea stem bark extract induces apoptosis and inhibits metastasis in human colorectal carcinoma HCT 116 cells, through modulation of multiple cell signalling pathways显示文摘Considering the great potential of natural products as anticancer agents, the present study was designed to explore the molecular mechanisms responsible for anticancer activities of Mesua ferrea stem bark extract against human colorectal carcinoma. Based on MTT assay results, bioactive sub-fraction(SF-3) was selected for further studies using HCT 116 cells. Repeated column chromatography resulted in isolation of less active α-amyrin from SF-3, which was identified and characterized by GC-MS and HPLC methods. α-amyrin and betulinic acid contents of SF-3 were measured by HPLC methods. Fluorescent assays revealed characteristic apoptotic features, including cell shrinkage, nuclear condensation, and marked decrease in mitochondrial membrane potential in SF-3 treated cells. In addition, increased levels of caspases-9 and-3/7 levels were also observed in SF-3 treated cells. SF-3 showed promising antimetastatic properties in multiple in vitro assays. Multi-pathway analysis revealed significant down-regulation of WNT, HIF-1α, and EGFR with simultaneous up-regulation of p53, Myc/Max, and TGF-β signalling pathways in SF-3 treated cells. In addition, promising growth inhibitory effects were observed in SF-3 treated HCT 116 tumour spheroids, which give a hint about in vivo antitumor efficacy of SF-3 phytoconstituents. In conclusion, these results demonstrated that anticancer effects of SF-3 towards colon cancer are through modulation of multiple molecular pathways. | Muhammad Asif Armaghan Shafaei Aman Shah Abdul Majid Mohammed Oday Ezzat Saad S Dahham Mohamed B.Khadeer Ahamed Chern Ein Oon Amin Malik Shah Abdul Majid | 2017 | Chinese Journal of Natural Medicines2017，15，7： | 2 |
| 13 | Equilibrium studies of the sorption of Hg( II ) ions onto chitosan 显示文摘 | Shafaei A Ashtiani F Kaghazchi T | 2007 | Chemical Engineering Journal2007，133，123： | 1 |
| 14 | Bioleaching of sphalerite sample from Kooshk leadizinc tailing dam 显示文摘 | Mehrabani J V Shafaei S Z Noaparast M | 2013 | Transactions of Nonferrous Metals Society of Chian2013，23，12： | 1 |
| 15 | Mesophilic and thermophilic bioIeaching of copper from a chalcopyrite-containing molybdenite concentrate显示文摘 | Abdollahi H Shafaei S Z Noaparast M | 2014 | Int J Miner Process2014，128，1： | 1 |
| 16 | Equilibrium studies of the sorption of Hg(Ⅱ) ions on to chitosan显示文摘 | Shafaei A Ashyiani F Z Kaghzchi T | 2007 | Chemical Engineering Journal2007，133，13： | 1 |
| 17 | Removal of Mn2' ions from synthetic wastewater by electrocoagulation process 显示文摘 | Shafaei A Rezayee M Arami M | 2010 | Desalination2010，260，123： | 1 |
| 18 | Effects of humanplacental serum on proliferation and morphology of human adiposetissue-derived stem cells 显示文摘 | Shafaei H Esmaeili A Mardain M | 2011 | Bone Marrow Transplantation2011，46，11： | 1 |
| 19 | Monte Carlo simulation of x-ray fluorescence analysis of gold in kidney using 99m Tc radiopharmaceutical显示文摘 | Naser Mahdavi Mojtaba Shamsaei Mostafa Shafaei Ali Rabiei | 2013 | Radiation Physics and Chemistry2013，，： | 1 |
| 20 | Removal of Mn 2 + ions from synthetic wastewater by electrocoagulation process显示文摘 | Shafaei A Rezayee M Arami M Nikazar M | 2010 | Desalination2010，260，1： | 1 |
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