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N R Mandre - One of the best experts on this subject based on the ideXlab platform.
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mechanism of polymeric adsorption in Selective Flocculation of low grade iron ore
Separation Science and Technology, 2019Co-Authors: Diptimayee Nanda, N R MandreAbstract:Objective of this recent investigation is to beneficiate the low-grade iron fines by Selective Flocculation using three different polymers and to analyze their performance. Mechanism of the adsorba...
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studies on Selective Flocculation of low grade iron ore using statistical optimization
Journal of Dispersion Science and Technology, 2018Co-Authors: Kichakeswari Tudu, N R MandreAbstract:ABSTRACTIn this study, a two-level and three-variable full-factorial design is used to analyze the behavior of different variables of Selective Flocculation such as pulp density, pH, and flocculant dosage. The response of low-grade iron ore Flocculation was investigated using a two-level and three-variable factorial design. From the studies, the optimal conditions were found to be pH (10), pulp density (6%), and flocculant dosage (0.5 mg/g), and the estimated values of for grade and recovery were 67.52% and 80.17%, respectively. The coefficients of determination (R2) for grade and recovery were found to be 99.80% and 99.97%, respectively.
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enhanced recovery of low grade iron ore by Selective Flocculation method
Journal of Dispersion Science and Technology, 2018Co-Authors: Kichakeswari Tudu, Shravan Kumar, N R MandreAbstract:ABSTRACTBeneficiation of low-grade iron ore was carried out by Selective Flocculation process using different flocculants, namely starch amylopectin (AP) and grafted copolymer of amylopectin (GAP). The iron ore used in the investigation contained 56.98% Fe, 5.45% Al2O3, and 4.22% SiO2. Flocculant dosage, number of floc washing, and pH were considered as variable parameters to analyze their effect on the performance of grade and recovery of concentrate. A flocculant dosage of 0.4 mg/g was found to be the optimum condition for the sample and variable parameters under investigation. The investigation indicated that a grade of 64.77% Fe can be obtained with 96% recovery using AP; however, GAP showed the better result for Fe grade (67%) with a recovery of 97%.
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Comparison of Selective Flocculation of low grade goethitic iron ore fines using natural and synthetic polymers and a graft copolymer
International Journal of Minerals Metallurgy and Materials, 2018Co-Authors: Kichakeswari Tudu, N R MandreAbstract:This study aims to beneficiate low grade goethitic iron ore fines using a Selective Flocculation process. Selective Flocculation studies were conducted using different polymers such as starch amylopectin (AP), poly acrylic acid (PAA), and a graft copolymer (AP-g-PAA). The obtained results were analyzed; they indicate the enhancement of the iron ore grade from 58.49% to 67.52% using AP-g-PAA with a recovery of 95.08%. In addition, 64.45% Fe with a recovery of 88.79% was obtained using AP. Similarly, using PAA, the grade increased to 63.46% Fe with a recovery of 82.10%. The findings are also supported by characterizing concentrates using X-ray diffraction (XRD) and electron probe microanalysis (EPMA) techniques.
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Selective Flocculation of low grade iron ore slimes using different types of polymers
2017Co-Authors: Rakesh Kumar, N R MandreAbstract:A study on Selective Flocculation of low grade iron ore slimes employing carboxymethyl cellulose (CMC) and starch as flocculants and sodiumhexameta phosphate (SHMP) as dispersant has been carried out. The mineralogical studies reveal that the presence of hematite and goethite as major iron bearing phase. Quartz and kaolinite are found to be gangue minerals. The experiments carried out indicate that the Fe grade is enhanced from 58.24% to 65.32% Fe using starch as flocculant. A Fe grade of 63.44% is obtained using CMC as flocculant. Further, the efficacy of the studies was analysed using separation index, which indicate that the higher separation index was obtained with the tests employing starch.
Zhitao Yuan - One of the best experts on this subject based on the ideXlab platform.
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regulating effects of citric acid and pregelatinized starch on Selective Flocculation flotation of micro fine siderite
Journal of Molecular Liquids, 2020Co-Authors: Lixia Li, Zhitao Yuan, Chunfeng LiAbstract:Abstract To improve the beneficiation efficiency of carbonate-bearing iron ore, a Selective-Flocculation flotation method was developed to separate micro-fine siderite with citric acid and pregelatinized starch, which serve as the dispersant and the flocculant, respectively. Given that pregelatinized starch may have adverse effects on dispersion effect of citric acid, the regulating effects of these two species on the Selective Flocculation flotation of micro-fine siderite were examined by micro-flotation of artificially mixed ores and molecular dynamics simulations. The analyses of particle-size distribution and aggregation behaviour showed that citric acid effectively decreased the attachment of micro-fine siderite to hematite and quartz. In contrast, micro-fine siderite formed flocs Selectively with pregelatinized starch. Molecular dynamics calculations revealed that citric acid and pregelatinized starch could co-adsorb on siderite. Collector molecules of sodium oleate penetrated the adsorption layer and thus were adsorbed onto siderite. However, sodium oleate was unable to penetrate the dense pregelatinized starch layer on hematite. Furthermore, both pregelatinized starch and sodium oleate were barely adsorbed onto quartz. The regulating effects of citric acid and pregelatinized starch improved the Selective Flocculation flotation of micro-fine siderite. The FeO content of the ore was 5.15%, and this was increased to 20.15% by the above treatment, with a recovery rate of 71.08%.
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adsorption of pregelatinized starch for Selective Flocculation and flotation of fine siderite
Langmuir, 2019Co-Authors: Lixia Li, P. Somasundaran, Zhitao YuanAbstract:Pregelatinized starch (PS) was used for the Selective Flocculation and flotation of fine siderite in a carbonate-containing iron ore. With PS, the flotation of fine siderite was improved. The repulsive forces between fine siderite particles and the attractive forces between siderite and hematite or quartz were decreased after treatment with PS, indicating that the aggregation of siderite was enhanced and the aggregations of mixed minerals were weakened. An analysis of the changes in X-ray photoelectron spectra showed that coordination bonds were formed when PS was adsorbed on siderite and hematite. However, PS could not adsorb on quartz. Moreover, the molecular simulation showed that the main mechanism for PS adsorption on siderite was confirmed as a “tail model” with end −OH coordinated with Fe2+. The bridge connection of PS enhanced the Flocculation of fine siderite. The flotation of fine siderite was also enhanced. For hematite treated with PS, the combination of coordination bond and hydrogen bond res...
Lixia Li - One of the best experts on this subject based on the ideXlab platform.
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regulating effects of citric acid and pregelatinized starch on Selective Flocculation flotation of micro fine siderite
Journal of Molecular Liquids, 2020Co-Authors: Lixia Li, Zhitao Yuan, Chunfeng LiAbstract:Abstract To improve the beneficiation efficiency of carbonate-bearing iron ore, a Selective-Flocculation flotation method was developed to separate micro-fine siderite with citric acid and pregelatinized starch, which serve as the dispersant and the flocculant, respectively. Given that pregelatinized starch may have adverse effects on dispersion effect of citric acid, the regulating effects of these two species on the Selective Flocculation flotation of micro-fine siderite were examined by micro-flotation of artificially mixed ores and molecular dynamics simulations. The analyses of particle-size distribution and aggregation behaviour showed that citric acid effectively decreased the attachment of micro-fine siderite to hematite and quartz. In contrast, micro-fine siderite formed flocs Selectively with pregelatinized starch. Molecular dynamics calculations revealed that citric acid and pregelatinized starch could co-adsorb on siderite. Collector molecules of sodium oleate penetrated the adsorption layer and thus were adsorbed onto siderite. However, sodium oleate was unable to penetrate the dense pregelatinized starch layer on hematite. Furthermore, both pregelatinized starch and sodium oleate were barely adsorbed onto quartz. The regulating effects of citric acid and pregelatinized starch improved the Selective Flocculation flotation of micro-fine siderite. The FeO content of the ore was 5.15%, and this was increased to 20.15% by the above treatment, with a recovery rate of 71.08%.
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adsorption of pregelatinized starch for Selective Flocculation and flotation of fine siderite
Langmuir, 2019Co-Authors: Lixia Li, P. Somasundaran, Zhitao YuanAbstract:Pregelatinized starch (PS) was used for the Selective Flocculation and flotation of fine siderite in a carbonate-containing iron ore. With PS, the flotation of fine siderite was improved. The repulsive forces between fine siderite particles and the attractive forces between siderite and hematite or quartz were decreased after treatment with PS, indicating that the aggregation of siderite was enhanced and the aggregations of mixed minerals were weakened. An analysis of the changes in X-ray photoelectron spectra showed that coordination bonds were formed when PS was adsorbed on siderite and hematite. However, PS could not adsorb on quartz. Moreover, the molecular simulation showed that the main mechanism for PS adsorption on siderite was confirmed as a “tail model” with end −OH coordinated with Fe2+. The bridge connection of PS enhanced the Flocculation of fine siderite. The flotation of fine siderite was also enhanced. For hematite treated with PS, the combination of coordination bond and hydrogen bond res...
Yue Hua Hu - One of the best experts on this subject based on the ideXlab platform.
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separation of diaspore from bauxite by Selective Flocculation using hydrolyzed polyacrylamide
Journal of Central South University, 2014Co-Authors: Yue Hua HuAbstract:Selective Flocculation is a new method to solve the problem of China’s bauxite de-silication besides flotation and reverse flotation. The method of Selective Flocculation of bauxite using hydrolyzed polyacrylamide as flocculant was experimented and evaluated. The results of diaspore and kaolinite single mineral settling tests show that the difference between settlement yield of kaolinite (settling 15 min) and diaspore (settling 3 min) increases from 16% to 60% by adding flocculant at pH=7. Results of Selective Flocculation experiment of bauxite show that the higher concentrate grade (65.75) and Al-Si ratio (7.34) could be obtained with sodium carbonate as dispersant compared with sodium hexametaphosphate; under the action of flocculating agent, the concentrate grade and Al-Si ratio increase to 67.99 and 9.01. These results could meet the requirements of Bayer production, and the simpler process was expected to cost far less than traditional flotation method and a promising de-silication method of bauxite.
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Effects of water hardness on Selective Flocculation of diasporic bauxite
Transactions of Nonferrous Metals Society of China (English Edition), 2012Co-Authors: Wen Li Liu, Wei Sun, Yue Hua HuAbstract:The effect of electrolyte on settling behavior of kaolinite was studied. Effects of hard water on Selective Flocculation of diasporic bauxite was tested and the measures were taken to eliminate the effects of Ca 2+ and Mg 2+ in hard water. The results indicated that, not only the concentration of electrolyte ions but also the ionic valence of the electrolyte ions affects the settling behavior of kaolinite; hard water significantly affects its Selective Flocculation owing to Ca 2+ and Mg 2+; general dispersants could not eliminate the effects of Ca 2+ and Mg 2+. Self-made softening agent in our lab could weaken or eliminate the effects of hard water on Flocculation processes. The results of molecular dynamics simulation show that softening agent molecules could restrict Ca 2+ and prevent them from playing their roles, so as to eliminate the effects. The continuous pilot experiment results of bauxite Flocculation were even better than those obtained in laboratory. ?? 2012 The Nonferrous Metals Society of China.
Lopamudra Panda - One of the best experts on this subject based on the ideXlab platform.
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investigation of the mechanism for Selective Flocculation process using natural iron ore tailings
Revue De Metallurgie-cahiers D Informations Techniques, 2020Co-Authors: Lopamudra Panda, S K Biswal, Rayasam Venugopal, Narayan R MandreAbstract:A huge quantity of iron ore tailings was generated every year from the iron ore washing plants during beneficiation. These discarded tailings were stored in the tailing pond. Safe storage and handling of these tailings are a major concern to the management. Due to depletion of high-grade ore, the government of India had reduced the cut-off grade from 55 to 45% because of the shortage of the iron ore reserves. Ultrafine particles present in the tailings cannot be treated effectively by the conventional methods due to particle size limitations. For Indian iron ore, associated gangue mineral alumina is the major source which causes problems in the blast furnace. Removal of alumina from the iron ore of ultrafine size is a hill task. A Selective Flocculation approach was employed to the iron ore tailings which contain 50.98% of Fe (T) with 8.86% of Al2 O3 assay. It was observed that, when applying a Selective Flocculation process, the concentrate contains more than 63.48% Fe (%), 2.5% Al2 O3 with 31.196% recovery (%). The mechanism was investigated using zeta potential analysis, FTIR analysis, etc.
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assessment and mechanism investigation of Selective Flocculation process for ultrafine chromite particle
Separation Science and Technology, 2015Co-Authors: Lopamudra Panda, R Venugopal, N R Mandre, Veerendra Singh, P K BanerjeeAbstract:During beneficiation of low-grade chromite ore, huge amounts of ultrafine tailings are generated and contain substantial metal values which need to be recovered. Selective Flocculation technique is one of the processes for beneficiation of ultrafine particles. Here an attempt was made to establish Selective Flocculation process by using two types of synthetic mixtures. In addition to this, Selective Flocculation was also attempted on natural tailings. It was found that it is possible to enrich the chromite value using the Selective Flocculation process. The selectivity of the wheat starch to the chromite mineral was also investigated using image analysis, FTIR analysis, and zeta potential analysis.
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modelling and optimization of process parameters for beneficiation of ultrafine chromite particles by Selective Flocculation
Separation and Purification Technology, 2014Co-Authors: Lopamudra Panda, R Venugopal, P K Banerjee, S K Biswal, N R MandreAbstract:Chromite tailings are generated from chrome ore beneficiation plants, containing substantial quantities of ultrafine particles. Generally these ultrafine particles of chromite cannot be treated effectively using conventional beneficiation methods, because of limitations in particles size being treated by these processes. Selective Flocculation process could be one of the alternative physico-chemical methods for treating these ultrafine particles. Here an attempt was taken to establish Selective Flocculation process for treating chromite particles using synthetic mixture of high grade chromite ore and kaolin. Box Behnken experimental design was applied to study the significance of operating parameters like flocculant dose, dispersant dose and pH on responses of Selective Flocculation process. Both pH and flocculant dose significantly affect Selective Flocculation process. Further, an optimization of process parameters were also carried out and optimized response was found to be 41.86% grade of Cr2O3 in concentrate with 69.73% recovery.
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Artificial neural network approach to assess Selective Flocculation on hematite and kaolinite
International Journal of Minerals Metallurgy and Materials, 2014Co-Authors: Lopamudra Panda, R Venugopal, P K Banerjee, Surendra Kumar Biswal, N R MandreAbstract:Because of the current depletion of high grade reserves, beneficiation of low grade ore, tailings produced and tailings stored in tailing ponds is needed to fulfill the market demand. Selective Flocculation is one alternative process that could be used for the beneficiation of ultra-fine material. This process has not been extensively used commercially because of its complex dependency on process parameters. In this paper, a Selective Flocculation process, using synthetic mixtures of hematite and kaolinite in different ratios, was attempted, and the adsorption mechanism was investigated by Fourier transform infrared (FTIR) spectroscopy. A three-layer artificial neural network (ANN) model (4-4-3) was used to predict the separation performance of the process in terms of grade, Fe recovery, and separation efficiency. The model values were in good agreement with experimental values.
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Performance evaluation for selectivity of the flocculant on hematite in Selective Flocculation
International Journal of Minerals Metallurgy and Materials, 2013Co-Authors: Lopamudra Panda, R Venugopal, P K Banerjee, S K Biswal, N R MandreAbstract:Increased demand for iron ore necessitates the utilization of low-grade iron ore fines, slimes, and existing tailings. Selective Flocculation can be an alternative physico-chemical process for utilizing these low-grade fines, slimes, and tailings. In Selective Flocculation, the most critical objective is the selection of proper reagents that will make floc of desired minerals. In present study, Selective Flocculation was applied to ultra-fine synthetic mixtures of hematite and kaolinite, and the Fe value was upgraded up to 65.78% with the reduction of Al2O3 and SiO2 values to 2.65% and 3.66%, respectively. Here, degraded wheat starch was used as a flocculant.In this process, separation occurs on the basis of the selectivity of the flocculant. The selectivity of the flocculant can be quantified in terms of separation efficiency. Here, an attempt was also made to develop a correlation between separation efficiency and major operating parameters such as flocculent dose, pH value, and solid concentration to predict the separation performance.