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| 1 | Influence of the roughness and shape of quartz particles on their flotation kinetics显示文摘Surface roughness and shape play an important role on the behavior of particles in various processes such as flotation. In this re-search, the influence of different grinding methods on the surface roughness and shape characteristics of quartz particles as well as the effect of these parameters on the flotation of the particles was investigated. The surface roughness of the particles was determined by measuring their specific surface area via the gas adsorption method. The shape characteristics of the particles were measured and calculated by images obtained by scanning electron microscopy via an image analysis system. The flotation kinetics was determined using a laboratory flotation cell. The results showed that the particles of rod mill products have higher roughness and elongation ratio and lower roundness than the parti-cles of ball mill products. The flotation kinetics constant of the particles increased with their surface roughness increasing. Particles with higher elongation and lower roundness indicated higher floatability. In addition, the influence of the surface roughness on the flotation kinet-ics was greater than that of shape parameters. | Mehdi Rahimi Fahimeh Dehghani Bahram Rezai Mohammad Reza Aslani | 2012 | International Journal of Minerals,Metallurgy and Materials2012，19，4： | 8 |
| 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 | Estimation of froth flotation recovery and collision probability based on operational parameters using an artificial neural network显示文摘An artificial neural network and regression procedures were used to predict the recovery and collision probability of quartz flotation concentrate in different operational conditions. Flotation parameters, such as dimensionless numbers (Froude, Reynolds, and Weber), particle size, air flow rate, bubble diameter, and bubble rise velocity, were used as inputs to both methods. The linear regression method shows that the relationships between flotation parameters and the recovery and collision probability of flotation can achieve correlation coefficients (R2) of 0.54 and 0.87, respectively. A feed-forward artificial neural network with 3-3-3-2 arrangement is able to simultaneously estimate the recovery and collision probability as the outputs. In testing stages, the quite satisfactory correlation coefficient of 0.98 was achieved for both outputs. It shows that the proposed neural network models can be used to determine the most advantageous operational conditions for the expected recovery and collision probability in the froth flotation process. | Saeed Chehreh Chelgani Behzad Shahbazi Bahram Rezai | 2010 | International Journal of Minerals,Metallurgy and Materials2010，17，5： | 5 |
| 4 | Numerical simulation of high voltage electric pulse comminution of phosphate ore显示文摘Numerical simulation of the electrical field distribution helps in-depth understanding of the mechanisms behind the responses and the benefits of the high voltage pulse comminution. The COMSOL Multiphysics package was used to numerically simulate the effect of ore compositions in this study. Regarding phosphate ore particles shape and composition, the effects of mineral composition, particle size, particle shape and electrodes distance were investigated on the electrical field intensity and distribution. The results show that the induced electrical field is significantly dependent on the electrical properties of minerals,the feed particle size and the location of conductive minerals in ores. The angle of material contact surface with the discharge electrode is also an important factor in the intensity of electrical field. Moreover,it is found that the specific liberation effect at the disintegration of phosphate ore by electrical pulses is due to the locality of the electrical field at the interface of mineral components of the phosphate ore aggregates with different permittivities. However, the intensity of the electrical field increases with sharpening the contact angle. Besides, the electrical discharge in the samples is converted to the electrohydraulic discharge across the surrounding water by changing the distance between the discharge electrode and sample surface. | Razavian Seyed Mohammad Rezai Bahram Irannajad Mehdi Ravanji Mohammad Hasan | 2015 | International Journal of Mining Science and Technology2015，25，3： | 4 |
| 5 | Performance prediction of hard rock TBM using Rock Mass Rating (RMR) system显示文摘 | Jafar Khademi Hamidi Kourosh Shahriar Bahram Rezai Jamal Rostami | 2010 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research2010，，4： | 3 |
| 6 | 黄铜矿精矿在甘氨酸介质中的循环伏安及动电位极化研究显示文摘采用循环伏安及动电位极化方法研究黄铜矿在甘氨酸介质中的浸出反应机理及动力学。使用黄铜精矿−碳糊电极研究pH值(9~12),温度(30~90)及甘氨酸浓度(0~2 mol/L)对腐蚀电流密度、腐蚀电位及循环伏安曲线的影响。结果显示,甘氨酸浓度从0增加到2 mol/L导致氧化峰电流密度增加;在相同条件下,腐蚀电流密度从约28μA/cm2增加至约89μA/cm2,同时腐蚀电位由−80 mV降至−130 mV。在温度不高于60℃的条件下,电流密度随温度的增加而增加;当温度高于60℃时,电流密度随温度增加而降低。电流密度随pH值的变化与温度相似,当pH值从9增至10.5时电流密度增加,pH值高于10.5时电流密度降低。此外,铜氧化物及铁氧化物的热力学稳定性在较高温度下增加。 | Maryam KHEZRI Bahram REZAI Ali Akbar ABDOLLAHZADEH Benjamin PWILSON Mehdi MOLAEINASAB Mari LUNDSTRÖM | 2021 | Transactions of Nonferrous Metals Society of China2021，31，2： | 3 |
| 7 | Performance prediction of hard rock TBM using Rock Mass Rating (RMR) system显示文摘 | Jafar Khademi Hamidi Kourosh Shahriar Bahram Rezai Jamal Rostami | 2010 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research2010，，4： | 2 |
| 8 | Application of Fuzzy Set Theory to Rock Engineering Classification Systems: An Illustration of the Rock Mass Excavability Index显示文摘 | Jafar Khademi Hamidi Kourosh Shahriar Bahram Rezai Hadi Bejari | 2010 | Rock Mechanics and Rock Engineering2010，，3： | 2 |
| 9 | 高压电选法从石英中分离锆石的新预处理方法(英文)显示文摘静电选矿是一种基于矿物导电性的矿物加工方法。但该方法存在一些严重问题,如对湿度敏感,中矿产率高和含有非导电矿物杂质。为克服这些缺点,本文作者提出一种新的预处理方法,用于在静电选矿前从石英中分离锆石。预处理包括两个阶段:一是使用十二烷基硫酸钠(SDS)作捕集剂调节锆石表面的润湿性,二是喷洒电解质水溶液以提高石英表面的导电性。考察pH值、捕集剂浓度、调节时间、电解质浓度和种类等重要参数对分选效率的影响。研究表明,高压电选的最佳条件如下:pH值为4,SDS浓度为1×10-4 mol/L,调节时间为4 min,NaCl为电解质,其浓度为4.27 mol/L,最佳条件下的分选效率为95.12%。该预处理方法可成功地应用于高压电选前各种组成的导电性或非导电性矿物的分选。 | Sivash NOURI Fatemeh Sadat HOSEINIAN Bahram REZAI Kamal SABERYAN | 2019 | Transactions of Nonferrous Metals Society of China2019，29，8： | 2 |
| 10 | Effect of microwave pretreatment on grinding and flotation kinetics of copper complex ore显示文摘The present study initially investigates the kinetics of microwave-assisted grinding and flotation in a porphyry copper deposit.Kinetic tests were conducted on untreated and microwave-irradiated samples by varying the exposure time from 15 to 150 s.Optical microscopy,energy-dispersive X-ray spectroscopy,and scanning electron microscopy were conducted to determine the mineral liberation and particle surface properties,and to perform mineralogical analyses.Results showed that the ore breakage rate constant monotonically increased by increasing the exposure time,particularly for the coarsest fraction size(400μm)due to the creation of thermal stress fractures alongside grain boundaries.Excessive irradiation time(>60 s)led to the creation of oxidized and porous surfaces along with a dramatic change in particle morphologies that result in a substantial reduction of chalcopyrite and pyrite flotation rate constants and ultimate recoveries.We concluded that MW-pretreated copper ore was ground faster than the untreated variety,but the two types have slightly similar floatabilities. | Hamed Gholami Bahram Rezai Ahmad Hassanzadeh Akbar Mehdilo Mohammadreza Yarahmadi | 2021 | International Journal of Minerals,Metallurgy and Materials2021，28，12： | 1 |
| 11 | Dynamic simulation of pilot thickener operation using phenomenological model with results validation for continuous and discontinuous tests显示文摘The phenomenological theory of sedimentation-thickening processes predicts the settling behavior of a flocculated suspension in dependence of two functions, the batch flux density function and the effective solid stress. These functions were determined using batch settling tests. The governing equations for sedimentation were then solved numerically for these functions and the predictions were compared to the experimental results from pilot scale thickener tests. Firstly, the continuous tests were performed in the plexiglass pilot thickener at different feed flow rates and discharge rates and the solid volume fraction of discharge, the bed height and the time were recorded for each condition. These tests were also simulated and it was observed that there is a good agreement between the results of continuous tests and the results of dynamic simulation. Secondly, the discontinuous tests were performed in the plexiglass pilot thickener at different feed flow rates with a discharge rate of zero. The bed formation rate was determined for each condition. These tests were also simulated and it was observed that there is a good agreement between the results of discontinuous tests and the results of simulation. | Rahimi Mehdi Unesi Majid Rezai Bahram Abdollahzadeh Ali | 2017 | Journal of Central South University2017，24，5： | 1 |
| 12 | 基于混合神经遗传算法的半自磨机功率预测(英文)显示文摘一般全面预测半自磨机功率的方法都需要经过长期实验。本文研究不同的操作参数对磨机和工作指数的影响,如供给水分、质量流速、磨机荷重计自重、固含率、进口和出口水流量。测试185个全面的半自磨机功率,用于开发与输入和输出数据有关的人工神经网络和的混合遗传算法模型。在预测半自磨机功率上,混合遗传算法模型比人工神经网络更高效。敏感性分析确定了半自磨机功率预测最高效的输入参数。通过混合遗传算法模型的敏感性分析发现,工作指数、磨机入口水、磨机荷重计自重、固含率、质量流速和供给水分与磨机功率有直接关系,而出口水与磨机功率负相关。结果表明,混合遗传算法模型能用于评价输入操作参数变化导致的输出。 | Hoseinian Fatemeh Sadat Abdollahzadeh Aliakbar Rezai Bahram | 2018 | Journal of Central South University2018，25，1： | 1 |
| 13 | Applied Mineralogical Studies on Iranian Titanium Deposits显示文摘Qara-aghaj and Skandian as hard rock titanium deposit and Kahnooj one as a placer deposit were investigated from applied mineralogical point of view. The mineralogical studies were carried out using XRD, XRF, optical microscopy, scanning electron microscopy and microprobe analysis. These studies indicated that ilmenite and magnetite are main valuable minerals in the studied ores. Pyroxene, olivine and plagioclase are the main gangue minerals in Qara-aghaj ore while chlorite and plagioclase are the major gangue minerals in Skandian ore. Plagioclase, clinopyroxene, amphibole, feldspate and some quartz are the important gangue minerals in kahnooj deposit. In all three ores ilmenite is mainly in the form of ilmenite grains but some lamellae of ilmenite with thickness between 0.1 to 20 μm have been occurred as exsolution textures inside magnetite grains, where the magnetite here can be referred to as ilmenomagnetite. In the hard rock ores some fine ilmenites have been disseminated in silicate minerals. The liberation degree of granular ilmenite was determined 150, 140 and 200 μm for Qara-aghaj, Skandian and Kahnooj, respectively. So, only the granular form of ilmenite is recoverable by physical methods. Some sphene and rutile as titanium containing minerals were observed mainly inside ilmenite phase in kahnooj ore. Some fine rutile was also found inside Skandian ilmenite while there were not any other titanium minerals inside Qara-aghaj ilmenite. Apatite is another valuable mineral which was found only in Qara-aghaj ore. Using SEM and microprobe analysis it was found that there are different amounts of exsolved fine lamellae of hematite inside ilmenite in Qara-aghaj and Kahnooj ores while it was not observed in Sckandian one. The average contents of TiO2 in the lattice of Qara-aghaj, Skandian and Kahnooj ilmenite were determined 51.13, 50.9% and 52.02%, respectively. FeO content of ilmenite lattice for all three samples is clearly lower than the theoretical content. This is due to the substitution of Mg and Mn for some Fe2+ ions in the ilmenite lattice. V2O3 content of magnetite lattice is up to 1%. So, magnetite can be a suitable source for production of vanadium as a by-product in all three deposits. | Akbar Mehdilo Mehdi Irannajad Bahram Rezai | 2013 | 矿物学报2013，33，S1： | 0 |
| 14 | Dynamic simulation of the effect of time-dependent variation of pH on response variable of the tailing thickener of coal washing plant显示文摘Dynamic simulation approach can be used for understanding the nonlinear behavior in mineral processing circuits. In this study, the gel point, the main parameters of batch flux density function and the main parameters of effective solid stress were determined at different conditions (pH, flocculant dosage and particle size). Therefore, the main parameters of phenome no logical model of sedimentation and thickening were determined as a functio n of particle size, pH and flocculant dosages using the result of experimental tests and Curve expert professional software. Then, the dynamic simulation was carried out for the industrial thickener of coal washing plant and the time-dependent variation of response variables was investigated by time-dependent variation of pH of input feed to thickener using the obtained equations. It was observed that it is possible to predict the thickener behavior as a function of time for time dependent variation of pH of input feed to the thickener of coal washing plant using obtained equations that it was not possible using phenomenological model of thickener alone. | Mehdi Rahimi Ali Akbar Abdollahzadeh Bahram Rezai | 2019 | International Journal of Coal Science & Technology2019，6，1： | 0 |
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