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The effects of flotation operation parameters, including froth depth, air flowrate, and frother dosage, on the froth and collection zone recovery and the flowrate of particles into the froth phase were investigated in a 10 m3 industrial cell. The results showed that froth recovery increases upon increasing air flowrate and frother dosage, as well as reducing froth depth. While all tested parameters affected the particles that entered into the froth phase, air flowrate and frother dosage showed the most and least significance, respectively. When the air flowrate, frother dosage, and froth depth were 146 m3/h, 150 mL/min, and 5 cm, respectively, froth recovery was found to be above 84%. Also, the effect of the parameters studied on collection zone recovery was different from their effect on the froth zone, with air flowrate having the greatest impact on the former.
Mahdi Ostadrahimi; Saeed Farrokhpay; Khodakaram Gharibi; Ali Dehghani. Effects of Operating Parameters on the Froth and Collection Zone Recovery in Flotation: An Industrial Case Study in a 10 m3 Cell. Minerals 2021, 11, 494 .
AMA StyleMahdi Ostadrahimi, Saeed Farrokhpay, Khodakaram Gharibi, Ali Dehghani. Effects of Operating Parameters on the Froth and Collection Zone Recovery in Flotation: An Industrial Case Study in a 10 m3 Cell. Minerals. 2021; 11 (5):494.
Chicago/Turabian StyleMahdi Ostadrahimi; Saeed Farrokhpay; Khodakaram Gharibi; Ali Dehghani. 2021. "Effects of Operating Parameters on the Froth and Collection Zone Recovery in Flotation: An Industrial Case Study in a 10 m3 Cell." Minerals 11, no. 5: 494.
SYNOPSIS The effect of flotation operational parameters on froth stability and froth recovery was studied. Froth stability was measured using a special column. To determine the froth recovery, the froth height change model and froth height exponential model were used. It was found that since the interactions between the pulp and froth zones affect the time of froth formation, the exponential model is more suitable than the froth height change method for determining the froth recovery. The results showed that superficial air velocity and collector dosage have, respectively, the highest and lowest effect on the froth recovery, while froth recovery decreases sharply with increasing froth height. Keywords: froth stability, froth recovery, superficial air velocity, collector dosage, frother dosage.
M. Ostadrahimi; S. Farrokhpay; K. Gharibi; A. Dehghani; M. Aghajanloo. Effects of flotation operational parameters on froth stability and froth recovery. Journal of the Southern African Institute of Mining and Metallurgy 2021, 121, 11 -20.
AMA StyleM. Ostadrahimi, S. Farrokhpay, K. Gharibi, A. Dehghani, M. Aghajanloo. Effects of flotation operational parameters on froth stability and froth recovery. Journal of the Southern African Institute of Mining and Metallurgy. 2021; 121 (1):11-20.
Chicago/Turabian StyleM. Ostadrahimi; S. Farrokhpay; K. Gharibi; A. Dehghani; M. Aghajanloo. 2021. "Effects of flotation operational parameters on froth stability and froth recovery." Journal of the Southern African Institute of Mining and Metallurgy 121, no. 1: 11-20.
In flotation, bubbles are responsible for carrying the hydrophobic particles to the concentrate and bubble size is one of the most effective parameters in this process. The usual method to estimate the bubble size is measuring the diameter of rising bubbles, which requires special equipment and it is time consuming. In some cases, the bubble size can be estimated by mathematical methods. In this regard, parameters such as gas holdup, superficial gas velocity, superficial liquid velocity, and fluid density are required. A new model to estimate the bubble size in flotation was proposed in this paper. It was shown that the estimated values for bubble sizes obtained from this model have higher accuracy than those obtained using previously published models.
Mahdi Ostadrahimi; Saeed Farrokhpay; Khodakaram Gharibi; Ali Dehghani. A new empirical model to calculate bubble size in froth flotation columns. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2020, 594, 124672 .
AMA StyleMahdi Ostadrahimi, Saeed Farrokhpay, Khodakaram Gharibi, Ali Dehghani. A new empirical model to calculate bubble size in froth flotation columns. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2020; 594 ():124672.
Chicago/Turabian StyleMahdi Ostadrahimi; Saeed Farrokhpay; Khodakaram Gharibi; Ali Dehghani. 2020. "A new empirical model to calculate bubble size in froth flotation columns." Colloids and Surfaces A: Physicochemical and Engineering Aspects 594, no. : 124672.
Titration is often used to determine the iron grade in sulfide ores. In this method, HCl is used as the main solvent. If the ore contains iron sulfide minerals, such as pyrite, it cannot be completely dissolved in HCl, and the measurements error will be high. Therefore, roasting is used to determine the iron grade in such cases. But roasting requires special equipment and it is usually time consuming. On the other hand, while HNO3 can dissolve sulfide minerals, the results often contain a high measurement error due to remaining acid during titration. In this study, a new method to determine the iron grade in iron sulfide ores was proposed by using perchloric acid. The iron grade of a high pyrite-containing ore was determined by the new method, and the results were compared to those obtained by the traditional roasting or HNO3 titration. The new method was found to provide iron grade values close to the roasting method. The proposed method was tested on a number of samples with known iron grades. Results showed 0.999 determination coefficient (R2) suggesting this method is reliable and it can be used to analyze iron grade in sulfide mineral-containing ores.
Mahdi Ostadrahimi; Saeed Farrokhpay; Khodakaram Gharibi; Ali Dehghani. Determining Iron Grades of Ores or Concentrates Containing Sulfide Minerals. Metallurgical and Materials Transactions A 2020, 51, 505 -509.
AMA StyleMahdi Ostadrahimi, Saeed Farrokhpay, Khodakaram Gharibi, Ali Dehghani. Determining Iron Grades of Ores or Concentrates Containing Sulfide Minerals. Metallurgical and Materials Transactions A. 2020; 51 (2):505-509.
Chicago/Turabian StyleMahdi Ostadrahimi; Saeed Farrokhpay; Khodakaram Gharibi; Ali Dehghani. 2020. "Determining Iron Grades of Ores or Concentrates Containing Sulfide Minerals." Metallurgical and Materials Transactions A 51, no. 2: 505-509.
Physical separation methods have been used in mineral industry for centuries to separate valuable minerals from gangues using differences in their physical properties
Saeed Farrokhpay. Editorial for the Special Issue: “Physical Separation and Enrichment”. Minerals 2020, 10, 173 .
AMA StyleSaeed Farrokhpay. Editorial for the Special Issue: “Physical Separation and Enrichment”. Minerals. 2020; 10 (2):173.
Chicago/Turabian StyleSaeed Farrokhpay. 2020. "Editorial for the Special Issue: “Physical Separation and Enrichment”." Minerals 10, no. 2: 173.
In this work, the flotation recovery of sphalerite and pyrite from an old high zinc grade tailing was studied. In particular, the effect of different flotation reagents such as collector, auxiliary collector, depressant, activators, and frother on the flotation performance were investigated. The synergic effect of the collector blends, as well as frother blends were also studied. In addition, the effect of the pre-conditioning of flotation pulp with scrubbing or ultrasonic on the selective separation of sphalerite and pyrite minerals were studied. More than 73% of the sphalerite was recovered from the accumulated tailings in the rougher stage. The pulp viscosity was considerably increased by increasing the pH from 5.5 to 10.5. As a result, sphalerite recovery and Zn selective separation were both considerably dropped. It was also found that frothers (MIBC and A65) have a synergic effect, and their mixture showed better metallurgical results than when each frother were solely used. The pre-conditioning with scrubbing or ultrasonic resulted in a major increase in the sphalerite floatability.
Behnam Bagheri; Javad Vazifeh Mehrabani; Saeed Farrokhpay. Recovery of sphalerite from a high zinc grade tailing. Journal of Hazardous Materials 2020, 381, 120946 .
AMA StyleBehnam Bagheri, Javad Vazifeh Mehrabani, Saeed Farrokhpay. Recovery of sphalerite from a high zinc grade tailing. Journal of Hazardous Materials. 2020; 381 ():120946.
Chicago/Turabian StyleBehnam Bagheri; Javad Vazifeh Mehrabani; Saeed Farrokhpay. 2020. "Recovery of sphalerite from a high zinc grade tailing." Journal of Hazardous Materials 381, no. : 120946.
The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the chromium-to-iron ratio. Also, detailed characterization studies including automated mineralogy were carried out to better understand the nature of the samples. Enhancing the chromium-to-iron ratio was achieved by using advanced spiral separators which will be discussed in this paper.
Sunil Tripathy; Y Rama Murthy; Veerendra Singh; Saeed Farrokhpay; Lev O. Filippov. Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods. Minerals 2019, 9, 667 .
AMA StyleSunil Tripathy, Y Rama Murthy, Veerendra Singh, Saeed Farrokhpay, Lev O. Filippov. Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods. Minerals. 2019; 9 (11):667.
Chicago/Turabian StyleSunil Tripathy; Y Rama Murthy; Veerendra Singh; Saeed Farrokhpay; Lev O. Filippov. 2019. "Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods." Minerals 9, no. 11: 667.
Fine and coarse fractions of spodumene were obtained from a pegmatite ore and their flotation was investigated under different conditions. In particular, the optimum pH and collector dosage were studied. It was found that the best flotation performance occurs at pH 10 using 250 mg/L of sodium oleate. It was also observed that upon the addition of CaCl2, spodumene flotation recovery increases to about 90%. In addition, poor floatability was found for spodumene when Na2CO3 was used as a pH regulator (compared to NaOH).The zeta potential data confirmed the adsorption of oleate on the spodumene surface. It was found that activation of spodumene by calcium ions makes the surface charge less negative due to the adsorption of Ca2+ on the surface. The crystallographic properties of spodumene were analyzed. The adsorption of sodium oleate was attributed to the chemisorption of oleate to the exposed Al and Si sites generated after breakage of the Al–O and Si–O bonds on the mineral surface. It was observed that the {110} planes are the most favorable for the adsorption of oleate. The {110} plane is the weakest plane, and spodumene has the highest tendency to cleave along this plane. The XRD data revealed that fine spodumene particles have more {110} planes than the coarser fraction, which may explain why the former has better floatability.
Lev Filippov; Saeed Farrokhpay; Lichau Lyo; Inna Filippova. Spodumene Flotation Mechanism. Minerals 2019, 9, 372 .
AMA StyleLev Filippov, Saeed Farrokhpay, Lichau Lyo, Inna Filippova. Spodumene Flotation Mechanism. Minerals. 2019; 9 (6):372.
Chicago/Turabian StyleLev Filippov; Saeed Farrokhpay; Lichau Lyo; Inna Filippova. 2019. "Spodumene Flotation Mechanism." Minerals 9, no. 6: 372.
Bubble loading is the ratio of the weight of the solid particles to the bubble’s surface, and it has an effective role in the flotation efficiency. This paper investigates bubble loading an industrial processing circuit through considering the important role of the bubble diameter in calculating bubble loading, and the effect of the aeration rate and frother dosage on the bubble diameter. The ratio of the weight of solid particles to the bubble volume was estimated to be in the range of 8 to 24 g/L. Although increasing the aeration could result in increasing the weight of the particles attached to the bubbles, the bubble loading was reduced by increasing the aeration rate due to its impact on the bubble diameter and the percentage of bubble surface coverage. For example, when the aeration rate was increased from 45 to 146 m3/h, the bubble loading decreased from 23 to 12 g/L. By increasing the frother dosage from 70 to 150 mL/min, the bubble loading increased from 16 to 19 g/L.
Mahdi Ostadrahimi; Khodakaram Gharibi; Ali Dehghani; Saeed Farrokhpay. Estimating Bubble Loading in Industrial Flotation Cells. Minerals 2019, 9, 222 .
AMA StyleMahdi Ostadrahimi, Khodakaram Gharibi, Ali Dehghani, Saeed Farrokhpay. Estimating Bubble Loading in Industrial Flotation Cells. Minerals. 2019; 9 (4):222.
Chicago/Turabian StyleMahdi Ostadrahimi; Khodakaram Gharibi; Ali Dehghani; Saeed Farrokhpay. 2019. "Estimating Bubble Loading in Industrial Flotation Cells." Minerals 9, no. 4: 222.
The association of fine grained MgNi silicates with oxy-hydroxides in laterites and saprolites represents challenges for ore processing, in particular, in nickel enrichment. The Weda Bay nickel deposit in Indonesia is a typical example of these complex ores, where clays such as nontronites develop on polyphase serpentinite as protolith. Thus, ores at Weda Bay have a very fine textured and complex mineralogy, which requires a comprehensive mineralogical identification through the use of a series of different types of analytical approaches (i.e. macroscopic and microscopic methods including SEM equipped with energy dispersive X-ray spectrometry (EDS), Raman spectroscopy, Infrared and X-ray fluorescence spectroscopy, and QEMSCAN® mapping). Nickel rich saprolites were found to be principally composed of several types of MgNi serpentines, quartz, clays (nontronite in particular) and little amounts of iron hydroxides. Besides, some parts of the deposit were characterized by the development of nontronites at the interface between the saprolite and the limonite zone. Above this zone, the limonite zone is dominated by iron hydroxides as expected, which replace all earlier silicates including serpentine, and contains a significant amount of nickel. The representative composite ore sample contains several nickel bearers with variable nickel grade of 2 to 3%. Exceptionally richer phases such as polygonal Fe (Ni)-rich serpentine were also found with nickel grade of 5 to 10%. Serpentine types as well as other newly formed silicates such as Fe-Mg-(Ni) smectites, are intimately mixed, preventing any mineral separation. Therefore, the only phases which can be separated are quartz and magnetite. This complicates the upgrading of nickel in Weda Bay laterite ore.
Saeed Farrokhpay; Michel Cathelineau; Simon B. Blancher; Odile Laugier; Lev Filippov. Characterization of Weda Bay nickel laterite ore from Indonesia. Journal of Geochemical Exploration 2018, 196, 270 -281.
AMA StyleSaeed Farrokhpay, Michel Cathelineau, Simon B. Blancher, Odile Laugier, Lev Filippov. Characterization of Weda Bay nickel laterite ore from Indonesia. Journal of Geochemical Exploration. 2018; 196 ():270-281.
Chicago/Turabian StyleSaeed Farrokhpay; Michel Cathelineau; Simon B. Blancher; Odile Laugier; Lev Filippov. 2018. "Characterization of Weda Bay nickel laterite ore from Indonesia." Journal of Geochemical Exploration 196, no. : 270-281.
Froth flotation has been widely used for the separating and concentrating valuable minerals in an ore. Froth rheology is an important parameter that affects flotation performance as it affects froth transportation. This paper reports the results of an investigation into the effect of flotation conditions on the froth rheology, in particular the influence of frother dosage and feed grade. A two-factor factorial experiment program was performed in a 20 L continuously operated flotation cell. It was found that, within the boundaries of this work, varying the frother dosage has no significant influence on the froth rheology, while the feed grade exhibits a positive correlation with the froth viscosity. In line with the previous study, the froth rheology has a negative correlation with the bubble size, and a positive correlation with the fraction of the bubble lamellae covered by solid particles. The froth rheology model previously developed by the authors (as a function of froth properties) was also validated in the current work.
Chao Li; Kym Runge; Fengnian Shi; Saeed Farrokhpay. Effect of flotation conditions on froth rheology. Powder Technology 2018, 340, 537 -542.
AMA StyleChao Li, Kym Runge, Fengnian Shi, Saeed Farrokhpay. Effect of flotation conditions on froth rheology. Powder Technology. 2018; 340 ():537-542.
Chicago/Turabian StyleChao Li; Kym Runge; Fengnian Shi; Saeed Farrokhpay. 2018. "Effect of flotation conditions on froth rheology." Powder Technology 340, no. : 537-542.
Talc and mica are major gangue minerals in many base metal ores including sulfide ores. Talc is a naturally hydrophobic mineral, and therefore it is easily floatable. There have been many studies to overcome this problem, and depress talc with various reagents. In this study the flotation of a copper ore in the presence of talc and muscovite was studied. It was found that talc can affect copper flotation mainly via froth phase. The copper grade and recovery were affected in the presence of only 7% talc. On the other hand, muscovite influenced the pulp phase via affecting the pulp rheology. The copper flotation grade was reduced in the presence of high amount (30%) of muscovite due to the entrainment, but its effect on the copper recovery was negligible.
Saeed Farrokhpay; Bulelwa Ndlovu; Dee Bradshaw. Behavior of talc and mica in copper ore flotation. Applied Clay Science 2018, 160, 270 -275.
AMA StyleSaeed Farrokhpay, Bulelwa Ndlovu, Dee Bradshaw. Behavior of talc and mica in copper ore flotation. Applied Clay Science. 2018; 160 ():270-275.
Chicago/Turabian StyleSaeed Farrokhpay; Bulelwa Ndlovu; Dee Bradshaw. 2018. "Behavior of talc and mica in copper ore flotation." Applied Clay Science 160, no. : 270-275.
Saeed Farrokhpay; Daniel Fornasiero; Lev Filippov. Upgrading nickel in laterite ores by flotation. Minerals Engineering 2018, 121, 100 -106.
AMA StyleSaeed Farrokhpay, Daniel Fornasiero, Lev Filippov. Upgrading nickel in laterite ores by flotation. Minerals Engineering. 2018; 121 ():100-106.
Chicago/Turabian StyleSaeed Farrokhpay; Daniel Fornasiero; Lev Filippov. 2018. "Upgrading nickel in laterite ores by flotation." Minerals Engineering 121, no. : 100-106.
Mineral and metal extractive industries play an important role in the current global economics, and mineral processing is one of the key areas to achieve and maintain sustainability. It is known that the rheological behaviour of mineral slurries affects their processing. However, in addition to controlling the transportation of slurries around processing circuits, rheological behaviour also influences separation processes such as flotation. Although the impact of rheology in unit operations such as grinding and slurry transport has received considerable attention, this has not been the case for flotation. This paper explains the relationship between rheology and froth flotation performance. The results revealed that the mineral flotation performance can be improved by controlling the rheology in flotation process.
S Farrokhpay. Significance of rheology characterisation in mineral flotation process performance. Journal of Physics: Conference Series 2018, 1045, 012010 .
AMA StyleS Farrokhpay. Significance of rheology characterisation in mineral flotation process performance. Journal of Physics: Conference Series. 2018; 1045 (1):012010.
Chicago/Turabian StyleS Farrokhpay. 2018. "Significance of rheology characterisation in mineral flotation process performance." Journal of Physics: Conference Series 1045, no. 1: 012010.
Chao Li; Kym Runge; Fengnian Shi; Saeed Farrokhpay. Effect of froth rheology on froth and flotation performance. Minerals Engineering 2018, 115, 4 -12.
AMA StyleChao Li, Kym Runge, Fengnian Shi, Saeed Farrokhpay. Effect of froth rheology on froth and flotation performance. Minerals Engineering. 2018; 115 ():4-12.
Chicago/Turabian StyleChao Li; Kym Runge; Fengnian Shi; Saeed Farrokhpay. 2018. "Effect of froth rheology on froth and flotation performance." Minerals Engineering 115, no. : 4-12.
In this work, 3% and 5% TiO2/Ag nanoparticles were dispersed in low-density polyethylene through melt blending process, and subsequently nanocomposite films were prepared by hot pressing. Paraffin was used for the first time in this work as compatibilizer agent. The effect of TiO2/Ag nanoparticle content, as well as compatibilizer dosage on the antimicrobial, morphological, mechanical, and optical performance of the nanocomposite films was investigated. Improved mechanical properties of the nanocomposite films were found on using paraffin as compatibilizer in comparison with the neat low-density polyethylene (LDPE) films. The optical study results also showed that the addition of TiO2/Ag to the LDPE films does not drastically change the film appearance other than making them more reddish. The fabricated nanocomposites presented in this study could be a suitable choice for food packaging (subject to further investigation of the food packaging behavior). The results showed that both TiO2/Ag nanoparticle and compatibilizer are needed to prevent the bacteria growth in the film. The best result was obtained by using 5% nanoparticle and 4% paraffin compatibilizer where the bacteria growth rate was significantly reduced by 95%. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45913.
Nafiseh Hosseini Nasab; Mohammad Mehdi Jalili; Saeed Farrokhpay. Application of paraffin and silver coated titania nanoparticles in polyethylene nanocomposite food packaging films. Journal of Polymer Science 2017, 135, 1 .
AMA StyleNafiseh Hosseini Nasab, Mohammad Mehdi Jalili, Saeed Farrokhpay. Application of paraffin and silver coated titania nanoparticles in polyethylene nanocomposite food packaging films. Journal of Polymer Science. 2017; 135 (8):1.
Chicago/Turabian StyleNafiseh Hosseini Nasab; Mohammad Mehdi Jalili; Saeed Farrokhpay. 2017. "Application of paraffin and silver coated titania nanoparticles in polyethylene nanocomposite food packaging films." Journal of Polymer Science 135, no. 8: 1.
Saeed Farrokhpay; Daniel Fornasiero. Flotation of coarse composite particles: Effect of mineral liberation and phase distribution. Advanced Powder Technology 2017, 28, 1849 -1854.
AMA StyleSaeed Farrokhpay, Daniel Fornasiero. Flotation of coarse composite particles: Effect of mineral liberation and phase distribution. Advanced Powder Technology. 2017; 28 (8):1849-1854.
Chicago/Turabian StyleSaeed Farrokhpay; Daniel Fornasiero. 2017. "Flotation of coarse composite particles: Effect of mineral liberation and phase distribution." Advanced Powder Technology 28, no. 8: 1849-1854.
Saeed Farrokhpay; Lev Filippov. Aggregation of nickel laterite ore particles using polyacrylamide homo and copolymers with different charge densities. Powder Technology 2017, 318, 206 -213.
AMA StyleSaeed Farrokhpay, Lev Filippov. Aggregation of nickel laterite ore particles using polyacrylamide homo and copolymers with different charge densities. Powder Technology. 2017; 318 ():206-213.
Chicago/Turabian StyleSaeed Farrokhpay; Lev Filippov. 2017. "Aggregation of nickel laterite ore particles using polyacrylamide homo and copolymers with different charge densities." Powder Technology 318, no. : 206-213.
Saeed Farrokhpay; Bulelwa Ndlovu; Dee Bradshaw. Behaviour of swelling clays versus non-swelling clays in flotation. Minerals Engineering 2016, 96-97, 59 -66.
AMA StyleSaeed Farrokhpay, Bulelwa Ndlovu, Dee Bradshaw. Behaviour of swelling clays versus non-swelling clays in flotation. Minerals Engineering. 2016; 96-97 ():59-66.
Chicago/Turabian StyleSaeed Farrokhpay; Bulelwa Ndlovu; Dee Bradshaw. 2016. "Behaviour of swelling clays versus non-swelling clays in flotation." Minerals Engineering 96-97, no. : 59-66.
Mohammad Mehdi Jalili; Kaveh Davoudi; Erfan Zafarmand Sedigh; Saeed Farrokhpay. Surface treatment of TiO2 nanoparticles to improve dispersion in non-polar solvents. Advanced Powder Technology 2016, 27, 2168 -2174.
AMA StyleMohammad Mehdi Jalili, Kaveh Davoudi, Erfan Zafarmand Sedigh, Saeed Farrokhpay. Surface treatment of TiO2 nanoparticles to improve dispersion in non-polar solvents. Advanced Powder Technology. 2016; 27 (5):2168-2174.
Chicago/Turabian StyleMohammad Mehdi Jalili; Kaveh Davoudi; Erfan Zafarmand Sedigh; Saeed Farrokhpay. 2016. "Surface treatment of TiO2 nanoparticles to improve dispersion in non-polar solvents." Advanced Powder Technology 27, no. 5: 2168-2174.