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Dr. SUNIL TRIPATHY
University of Lorraine

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0 Coal
0 Dewatering
0 Flowsheets
0 Geometallurgy
0 Physical separation

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Journal article
Published: 30 June 2021 in Journal of Cleaner Production
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Chromite ore processing tailing, a solid waste generated during the processing of chromite ore, is difficult to recover due to its ultra-fine size. The tailings generated from the process contains valuable chromite and iron-bearing minerals, loss of which is a matter of concern for the ferrochrome industry worldwide. Tailings generated from the processing plant is mainly dumped, causing space and environmental concerns. Researchers worldwide have carried out a rigorous study on the recovery of chromite from tailings, considering the low quantity of Cr(T) and Fe(T) in the ore. These processes are partially successful due to the further assimilation of waste in the form of tailings. In the present study, the tailings generated from a chromite ore beneficiary plant in India were investigated through a pyro-metallurgical route. The initial characterization confirmed the presence of nickel (0.5–0.9% Ni) in the ore, which led to the interest in smelting the ore to obtain nickel in the metal. The smelting behaviour of the tailings is studied under the submerged arc furnace and blast furnace condition, under varying basicity. A cost economic analysis of the process is evaluated to understand the feasibility of the real-time operation. The present investigation has revealed that the smelting of such tailings could result in a metal product with 79.23% Fe(T), 12.94% chromium and 1.11% nickel with a recovery >94%. The produced slag is enriched with a higher quantity of amorphous phase with a glassy phase >89%. The suggested process is a cleaner and sustainable approach towards valorisation of such mining waste and realization through the concept of the circular economy. It is concluded that the carbothermal smelting of tailings generated during enrichment can be valorized through submerged arc furnace route at optimum basicity of 1 by promoting the concept of zero discharge.

ACS Style

Pankaj Kumar; Sovan Kumar Patra; Sunil Kumar Tripathy; Nilamadhaba Sahu. Efficient utilization of nickel rich Chromite Ore Processing Tailings by carbothermic smelting. Journal of Cleaner Production 2021, 315, 128046 .

AMA Style

Pankaj Kumar, Sovan Kumar Patra, Sunil Kumar Tripathy, Nilamadhaba Sahu. Efficient utilization of nickel rich Chromite Ore Processing Tailings by carbothermic smelting. Journal of Cleaner Production. 2021; 315 ():128046.

Chicago/Turabian Style

Pankaj Kumar; Sovan Kumar Patra; Sunil Kumar Tripathy; Nilamadhaba Sahu. 2021. "Efficient utilization of nickel rich Chromite Ore Processing Tailings by carbothermic smelting." Journal of Cleaner Production 315, no. : 128046.

Original article
Published: 26 June 2021 in Transactions of the Indian Institute of Metals
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Slag generating from the basic oxygen furnace during steelmaking is one of the significant solid wastes that has not been recycled due to many physical, chemical, and structural properties. Phosphorous is one of the key yardsticks for recycling the slag as a Ca-rich flux into the iron making process. The recycling of the slag depends on the phosphorous limitation as well as other properties. In the present investigation, an effort is made to understand the phosphorous distribution in a slag generated from Indian operation and analyzed through different characterization techniques. It is found that phosphorous is well dispersed in all the different phases in the sample and present predominantly at an ultrafine size. It is further tried to analyze the phosphorous partition in the different slag phases through the magnetic separation. From the characterization, it can be concluded that it is difficult to partition phosphorous-rich fractions. Majority of the particles are varying with phosphorous concentration from 1.55 to 7.86% in ultrafine size dissemination.

ACS Style

Sunil Kumar Tripathy; D. S. Rao; C. Eswaraiah; D. Sahoo. Applied Mineralogical Investigation on the Nature of Phosphorous in the Basic Oxygen Furnace Slag. Transactions of the Indian Institute of Metals 2021, 1 -16.

AMA Style

Sunil Kumar Tripathy, D. S. Rao, C. Eswaraiah, D. Sahoo. Applied Mineralogical Investigation on the Nature of Phosphorous in the Basic Oxygen Furnace Slag. Transactions of the Indian Institute of Metals. 2021; ():1-16.

Chicago/Turabian Style

Sunil Kumar Tripathy; D. S. Rao; C. Eswaraiah; D. Sahoo. 2021. "Applied Mineralogical Investigation on the Nature of Phosphorous in the Basic Oxygen Furnace Slag." Transactions of the Indian Institute of Metals , no. : 1-16.

Journal article
Published: 22 May 2021 in Advanced Powder Technology
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The present study investigates the recovery of chromite from a low-grade ferruginous ore through the carbothermic magnetization route using conventional and microwave heating sources. The carbothermic magnetization of ore is studied in both a horizontal tube furnace and a microwave oven by varying different process variables. The main objective of the study is to enhance the magnetic susceptibility of iron-bearing gangue minerals to enable the separation in a magnetic field. Alteration of crystalline structure and magnetic property of these minerals enables separation of low-grade ore by using magnetic separation. It is found that low-grade ferruginous chromite ore can be upgraded by reduction roasting, and 61.2% Cr2O3 was recovered with a chromium-to-iron ratio of 1.93 from a feed chromium-to-iron ratio of 1.01. The optimum result is achieved at a roasting temperature of 800 °C, with a roasting time of 60 min and a reductant dosage of 7.5%. Similarly, under microwave radiation, the chromium-to-iron ratio was upgraded to 1.81 with a recovery of 22%Cr2O3. The optimum result achieved under microwave radiation is at a microwave power of 900 W and exposure time of 7.5 min, with a reductant dosage of 10%. The findings of these two processing routes are discussed through characterization tools.

ACS Style

Sunil Kumar Tripathy; Y. Rama Murthy; Nikkam Suresh; Lev O. Filippov. Carbothermic reduction roasting for processing of ferruginous chromite ore using conventional and microwave heating. Advanced Powder Technology 2021, 32, 2234 -2247.

AMA Style

Sunil Kumar Tripathy, Y. Rama Murthy, Nikkam Suresh, Lev O. Filippov. Carbothermic reduction roasting for processing of ferruginous chromite ore using conventional and microwave heating. Advanced Powder Technology. 2021; 32 (7):2234-2247.

Chicago/Turabian Style

Sunil Kumar Tripathy; Y. Rama Murthy; Nikkam Suresh; Lev O. Filippov. 2021. "Carbothermic reduction roasting for processing of ferruginous chromite ore using conventional and microwave heating." Advanced Powder Technology 32, no. 7: 2234-2247.

Journal article
Published: 19 May 2021 in Powder Technology
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The processing of e-waste is gaining importance worldwide as it contains a large number of valuable metals. In the present investigation, an attempt has been made to analyze the influence of surfactants on the flotation of printed circuit boards. Flotation kinetic studies have been carried out by varying different surfactant combinations such as C0F0 (without surfactants), C0F1 (only frother), C1F0 (only collector), and C1F1 (collector and frother). A first-order kinetic model has been proposed to explain the recovery of metallic and non-metallic particles. The hydrophobic plastic particles could be recovered to the froth products without surfactants. The addition of collector and frother imparts movement of few metallic particles to the froth products causing a decrease in the recovery of metals to the non-froth products (Cu recovery decreased from 92% to 72% and Sn recovery decreased from 90.1% to 65%). However, the frother is essential to impart stability to the froth and facilitate transportation of particles to the froth products. Frother alone can satisfactorily separate metallic and non-metallic particles.

ACS Style

Surya Kanta Das; G. Ellamparuthy; Tonmoy Kundu; Malay K. Ghosh; Shivakumar I. Angadi. Critical analysis of metallic and non-metallic fractions in the flotation of waste printed circuit boards. Powder Technology 2021, 389, 450 -459.

AMA Style

Surya Kanta Das, G. Ellamparuthy, Tonmoy Kundu, Malay K. Ghosh, Shivakumar I. Angadi. Critical analysis of metallic and non-metallic fractions in the flotation of waste printed circuit boards. Powder Technology. 2021; 389 ():450-459.

Chicago/Turabian Style

Surya Kanta Das; G. Ellamparuthy; Tonmoy Kundu; Malay K. Ghosh; Shivakumar I. Angadi. 2021. "Critical analysis of metallic and non-metallic fractions in the flotation of waste printed circuit boards." Powder Technology 389, no. : 450-459.

Research article
Published: 06 May 2021 in Mineral Processing and Extractive Metallurgy Review
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Ferrochromium production is a highly energy-intensive process, consuming between 3000 and 4000 kWh for producing one ton of ferrochrome alloy. The alloy produced contains chromium, iron as a principal constituent and silicon and carbon as an impurity. Minor quantity of silicon is desirable to aid in the fluidity of the alloy while smelting chromite ore. Still, at a higher level, it not only deports as the impurity in alloy but also causes a considerable drain of energy. Also, the excess of carbon in alloy causes problem during final carbon adjustment during steelmaking. An exhaustive understanding of different process parameters affecting impurity intake in the alloy can significantly reduce impurity and hence, energy consumption. The gained knowledge can be further utilized to control the process better and achieve the alloy of the desired composition. Several sets of industrial data were obtained and analyzed to understand the process. Different parameters, such as coke rate, power input, input silicon and average moisture on the composition and recovery of ferrochrome, were studied. From the study, it was concluded that a high grade of feed material with input Si <13 Wt.%, a coke rate of 380–390 kg/t of alloy and power input in the range of 3067–3200 kWh/t of alloy can result in an alloy with Si <2 Wt.%. Operating under the given power range is also observed to reduce the Cr2O3 loss to the slag.

ACS Style

Pankaj Kumar; Nilamadhaba Sahu; Aditya Roshan; Biranchi Narayan Rout; Sunil Kumar Tripathy. Influence of process parameters on impurity level in ferrochrome production-An industrial-scale analysis. Mineral Processing and Extractive Metallurgy Review 2021, 1 -11.

AMA Style

Pankaj Kumar, Nilamadhaba Sahu, Aditya Roshan, Biranchi Narayan Rout, Sunil Kumar Tripathy. Influence of process parameters on impurity level in ferrochrome production-An industrial-scale analysis. Mineral Processing and Extractive Metallurgy Review. 2021; ():1-11.

Chicago/Turabian Style

Pankaj Kumar; Nilamadhaba Sahu; Aditya Roshan; Biranchi Narayan Rout; Sunil Kumar Tripathy. 2021. "Influence of process parameters on impurity level in ferrochrome production-An industrial-scale analysis." Mineral Processing and Extractive Metallurgy Review , no. : 1-11.

Journal article
Published: 31 January 2021 in Minerals
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Magnetic separation is often considered pertinent for manganese ore beneficiation when the ore is abundant with siliceous rich gangue mineral phases. However, the process is deemed to be inapposite for the ferruginous type of ore, and remains a grey area of research. In the present investigation, two different types of manganese ore were studied in detail to understand the influence of mineralogy on their magnetic separation performance. Detailed experiments were performed by varying the critical variables of the dry magnetic separator, and the separation features were studied. The ore samples were thoroughly characterized by various techniques, including an automated advanced mineralogical tool. The mineralogical results revealed that primary manganese bearing minerals in both the ores are rich in cryptomelene, pyrolusite, psilomelane, and bixybyite. Similarly, the major gangue minerals were alumina-bearing minerals and iron-bearing phases (hematite and goethite). The optimum grade that could be obtained from single-stage dry magnetic separation was 35.52% Mn, and with a Mn:Fe ratio of 1.77, and 44% Mn recovery in the case of sample 1; whereas, a 33.75% Mn grade, with a Mn:Fe ratio of 1.66 at Mn recovery of 44% was reported for Sample 2. It was observed that both samples had a similar input chemistry (~28% Mn, ~1 Mn: Fe ratio) however, they had distinctive mineralogical assemblages. Furthermore, it was observed that the liberation of manganese mineral was in a course size range, i.e., 300 to 450 µm, while the association of iron and manganese bearing phases was lower in sample 1 when compared to sample 2.

ACS Style

Sharath Bhoja; Sunil Tripathy; Yanamandra Murthy; Tamal Ghosh; C. Kumar; Debaprasad Chakraborty. Influence of Mineralogy on the Dry Magnetic Separation of Ferruginous Manganese Ore—A Comparative Study. Minerals 2021, 11, 150 .

AMA Style

Sharath Bhoja, Sunil Tripathy, Yanamandra Murthy, Tamal Ghosh, C. Kumar, Debaprasad Chakraborty. Influence of Mineralogy on the Dry Magnetic Separation of Ferruginous Manganese Ore—A Comparative Study. Minerals. 2021; 11 (2):150.

Chicago/Turabian Style

Sharath Bhoja; Sunil Tripathy; Yanamandra Murthy; Tamal Ghosh; C. Kumar; Debaprasad Chakraborty. 2021. "Influence of Mineralogy on the Dry Magnetic Separation of Ferruginous Manganese Ore—A Comparative Study." Minerals 11, no. 2: 150.

Journal article
Published: 02 September 2020 in Advanced Powder Technology
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The effect of impeller speed and cell volume on batch coal flotation performance in a self-aerating flotation machine is studied in the present investigation. Factorial designed experiments are carried out to establish the relationships between the manipulated variables (impeller speed, and cell volume, and their interactions) with the separation indicators (yield, ash, combustible recovery and entrained water recovery). Correlation coefficient values are used to select the best fit model, and an analysis of variance to identify the statistically significant components of the model. The results indicated that both the impeller speed and cell volume significantly influence the performance of coal flotation. Further, the influence of these variables and their significance is discussed by flotation rate constant.

ACS Style

Sayed Janishar Anzoom; Sunil Kumar Tripathy; Laxmikanta Sahu; S. Bhattacharya; A.K. Mukherjee. Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine. Advanced Powder Technology 2020, 31, 4053 -4063.

AMA Style

Sayed Janishar Anzoom, Sunil Kumar Tripathy, Laxmikanta Sahu, S. Bhattacharya, A.K. Mukherjee. Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine. Advanced Powder Technology. 2020; 31 (9):4053-4063.

Chicago/Turabian Style

Sayed Janishar Anzoom; Sunil Kumar Tripathy; Laxmikanta Sahu; S. Bhattacharya; A.K. Mukherjee. 2020. "Influence of impeller speed and cell volume on coal flotation performance in a self-aerating flotation machine." Advanced Powder Technology 31, no. 9: 4053-4063.

Original article
Published: 28 May 2020 in Transactions of the Indian Institute of Metals
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An artificial neural network model to predict the performance of induced roll high-intensity magnetic separator while upgrading low-grade iron ore fines is presented in the present investigation. Key process parameters of induced roll magnetic separator operation, i.e., applied current, speed of rotor, splitter position, particle size, and feed rate, are used as the network input. A feedforward ANN is designed with one hidden layer, with units varying from 9 to 40 and capable of estimating the separation performance (iron content, silica content, iron recovery, and silica rejection of the magnetic product) in an induced roll magnetic separator. Simulated results obtained using the neural network modeling correspond closely to the actual results with a correlation of coefficient (R2) > 0.95 in training and testing stages. The developed models are further used to understand the sensitivity of the studied variables. The effects of speed of the rotor and splitter position are found to be more sensitive to the separation. Furthermore, an optimized solution is designed to predict the best achievable grade-recovery curve for this pre-concentration.

ACS Style

Sunil Kumar Tripathy; Itishree Mohanty; Lev Filippov. Application of Artificial Neural Networks to Predict Dry Magnetic Separation of Low-Grade Hematite Fines. Transactions of the Indian Institute of Metals 2020, 73, 1797 -1807.

AMA Style

Sunil Kumar Tripathy, Itishree Mohanty, Lev Filippov. Application of Artificial Neural Networks to Predict Dry Magnetic Separation of Low-Grade Hematite Fines. Transactions of the Indian Institute of Metals. 2020; 73 (7):1797-1807.

Chicago/Turabian Style

Sunil Kumar Tripathy; Itishree Mohanty; Lev Filippov. 2020. "Application of Artificial Neural Networks to Predict Dry Magnetic Separation of Low-Grade Hematite Fines." Transactions of the Indian Institute of Metals 73, no. 7: 1797-1807.

Journal article
Published: 29 March 2020 in Journal of Cleaner Production
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Efficient utilisation and recycling of industrial waste along with minimum exploitation of natural resources are major challenge towards the circular economy and sustainability of the planet. Blast furnace slag is a by-product of the iron-making process while producing pig iron. The present research provides an understanding of the two different types of slags of water quenched granulated slag and air-cooled slag that are generated from iron making process through the blast furnace route. The chemical, mineralogical, physical, thermal and morphological properties of four different slags generated under different cooling condition are evaluated for recycling to cement and aggregate application. Results indicated that the cooling pattern of the slag significantly affects the particle morphology and phase formation, which determines their usage and utilisation. Air-cooled slag contains substantial quantity of crystalline phases (>50%) which prevents the slag to exhibit cementitious properties whereas water-quenched slag mainly contains amorphous phases (>90%). In addition, the applicability in cement and aggregate application of both mentioned types of slags were studied. It is concluded that water quenched slag is closely matching with the properties required to be utilised in Portland slag cement manufacturing process. On the other hand, air-cooled slag is suitable as an aggregate for application in the construction industry.

ACS Style

Sunil Kumar Tripathy; Jayalaxmi Dasu; Y. Rama Murthy; Gajanan Kapure; Atanu Ranajan Pal; Lev Filippov. Utilisation perspective on water quenched and air-cooled blast furnace slags. Journal of Cleaner Production 2020, 262, 121354 .

AMA Style

Sunil Kumar Tripathy, Jayalaxmi Dasu, Y. Rama Murthy, Gajanan Kapure, Atanu Ranajan Pal, Lev Filippov. Utilisation perspective on water quenched and air-cooled blast furnace slags. Journal of Cleaner Production. 2020; 262 ():121354.

Chicago/Turabian Style

Sunil Kumar Tripathy; Jayalaxmi Dasu; Y. Rama Murthy; Gajanan Kapure; Atanu Ranajan Pal; Lev Filippov. 2020. "Utilisation perspective on water quenched and air-cooled blast furnace slags." Journal of Cleaner Production 262, no. : 121354.

Articles
Published: 16 December 2019 in Mineral Processing and Extractive Metallurgy Review
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The present investigation aimed to understand dewatering amenability of the tailing slurry generated during the beneficiation of chromite ore. The tailing includes mainly ultrafine particles with a concentration of Cr+6 which causes environmental and storage issues. Several dewatering techniques were investigated, including settling by using two different thickeners (high rate thickening and paste thickening), pressure filtration, as well as classification by using hydrocyclone. This paper explains the results obtained in various stages of the dewatering process. Further, different dewatering circuits were examined for the effective dewatering of the tailing slurry, and the optimum solutions were discussed. It is also concluded that up to 97% of the water can be recovered and recycled from such tailing slurry by adopting an efficient dewatering circuit.

ACS Style

Sunil Tripathy; Y. Rama Murthy; Saeed Farrokhpay; Lev Filippov. Design and Analysis of Dewatering Circuits for a Chromite Processing Plant Tailing Slurry. Mineral Processing and Extractive Metallurgy Review 2019, 42, 102 -114.

AMA Style

Sunil Tripathy, Y. Rama Murthy, Saeed Farrokhpay, Lev Filippov. Design and Analysis of Dewatering Circuits for a Chromite Processing Plant Tailing Slurry. Mineral Processing and Extractive Metallurgy Review. 2019; 42 (2):102-114.

Chicago/Turabian Style

Sunil Tripathy; Y. Rama Murthy; Saeed Farrokhpay; Lev Filippov. 2019. "Design and Analysis of Dewatering Circuits for a Chromite Processing Plant Tailing Slurry." Mineral Processing and Extractive Metallurgy Review 42, no. 2: 102-114.

Journal article
Published: 29 October 2019 in Minerals
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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.

ACS Style

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 Style

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 (11):667.

Chicago/Turabian Style

Sunil 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.

Articles
Published: 30 August 2019 in Mineral Processing and Extractive Metallurgy Review
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Recycling of the process water is an essential aspect for the mineral and coal processing industries to address the challenges on the sustainability of the environment. In this study, the influence of dissolved ions presents in the process water of an Indian coal preparation plant is investigated on flotation behavior of coal by a combination of release analysis, batch flotation tests, dynamic froth stability measurements, surface tension measurements, contact angle measurements, zeta potential measurements, and Fourier-transform infrared spectroscopy measurements. Also, comparison studies are conducted with de-ionized water to float the same coal for the evaluation.

ACS Style

Sayed Janishar Anzoom; Sunil Tripathy; Anish Dubey; Rashmi Singh; A K Mukherjee. Comparative Response on Flotation of Coal by Using Process and De-Ionized Water. Mineral Processing and Extractive Metallurgy Review 2019, 41, 361 -369.

AMA Style

Sayed Janishar Anzoom, Sunil Tripathy, Anish Dubey, Rashmi Singh, A K Mukherjee. Comparative Response on Flotation of Coal by Using Process and De-Ionized Water. Mineral Processing and Extractive Metallurgy Review. 2019; 41 (6):361-369.

Chicago/Turabian Style

Sayed Janishar Anzoom; Sunil Tripathy; Anish Dubey; Rashmi Singh; A K Mukherjee. 2019. "Comparative Response on Flotation of Coal by Using Process and De-Ionized Water." Mineral Processing and Extractive Metallurgy Review 41, no. 6: 361-369.

Journal article
Published: 02 August 2019 in Mineral Processing and Extractive Metallurgy Review
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ACS Style

C. Eswaraiah; Rahul K. Soni; Sunil Tripathy; Lev Filippov. Particle Classification Optimization of a Circulating Air Classifier. Mineral Processing and Extractive Metallurgy Review 2019, 40, 314 -322.

AMA Style

C. Eswaraiah, Rahul K. Soni, Sunil Tripathy, Lev Filippov. Particle Classification Optimization of a Circulating Air Classifier. Mineral Processing and Extractive Metallurgy Review. 2019; 40 (5):314-322.

Chicago/Turabian Style

C. Eswaraiah; Rahul K. Soni; Sunil Tripathy; Lev Filippov. 2019. "Particle Classification Optimization of a Circulating Air Classifier." Mineral Processing and Extractive Metallurgy Review 40, no. 5: 314-322.

Review
Published: 29 July 2019 in Mineral Processing and Extractive Metallurgy Review
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ACS Style

Veerendra Singh; Tarun Chakraborty; Sunil Tripathy. A Review of Low Grade Manganese Ore Upgradation Processes. Mineral Processing and Extractive Metallurgy Review 2019, 41, 417 -438.

AMA Style

Veerendra Singh, Tarun Chakraborty, Sunil Tripathy. A Review of Low Grade Manganese Ore Upgradation Processes. Mineral Processing and Extractive Metallurgy Review. 2019; 41 (6):417-438.

Chicago/Turabian Style

Veerendra Singh; Tarun Chakraborty; Sunil Tripathy. 2019. "A Review of Low Grade Manganese Ore Upgradation Processes." Mineral Processing and Extractive Metallurgy Review 41, no. 6: 417-438.

Article
Published: 31 January 2019 in Mining, Metallurgy & Exploration
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Banded hematite quartzite (BHQ) and banded hematite jasper (BHJ) ores represent a promising potential iron ore resource in the near future. The hematite and quartz in BHQ and the hematite and jasper in BHJ are closely related and require fine grinding for the liberation of hematite phases. The present study investigates the mineralogical features and comminution properties of BHQ and BHJ ores. In the BHQ ore, it is observed that thick bands of hematite have fine inclusions of silicate minerals, whereas silica bands have few grains of iron-bearing minerals. The hematite and quartz minerals in the iron and silicate bands of the BHJ ore appear to be more intricately associated and complex in nature, presenting difficulties for liberation. Bond work index studies were carried out for the BHQ and BHJ ores with different product fineness in order to evaluate the energy requirements in fine grinding. A higher Bond work index value was found for the BHJ ore (15.4 kWh/ton) than for the BHQ ore (12.4 kWh/ton). A decrease in the product particle size was associated with an increase in the work index value. Single-particle breakage experiments were designed by varying feed particle size and input energy. The specific energy consumption for the BHJ ore was higher than that for the BHQ ore. The comminution parameters showed that the BHJ ore is harder to grind than the BHQ ore, which may be due to the mineral composition and association of hematite phases with the silicates.

ACS Style

T. Santosh; S. I. Angadi; Nilima Dash; C. Eswaraiah; Sunil Tripathy. Characterization and Comminution Studies of Low-Grade Indian Iron Ores. Mining, Metallurgy & Exploration 2019, 36, 303 -312.

AMA Style

T. Santosh, S. I. Angadi, Nilima Dash, C. Eswaraiah, Sunil Tripathy. Characterization and Comminution Studies of Low-Grade Indian Iron Ores. Mining, Metallurgy & Exploration. 2019; 36 (2):303-312.

Chicago/Turabian Style

T. Santosh; S. I. Angadi; Nilima Dash; C. Eswaraiah; Sunil Tripathy. 2019. "Characterization and Comminution Studies of Low-Grade Indian Iron Ores." Mining, Metallurgy & Exploration 36, no. 2: 303-312.

Journal article
Published: 01 October 2018 in Waste Management
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Ferroalloy industries rely on minerals which are not available in pure form. The total value chain is very cost intensive and market driven. From mineral and environment conservation point of view every possible aspect must be explored for the economic utilisation of waste and low-grade ores. Unlike other metallurgical processes, Ferro alloys production generates a wide variety of waste rich in manganese/chrome which has a potential for recycling back. Fine size, high moisture content and presence of alkalis categorise this material into hazardous waste and economically non-viable. The challenge is to convert such anthropogenic material into a suitable feedstock for the furnace. In this article, the results of smelting trials carried out in electric arc furnace (EAF) using novel extruded briquettes (BREX) produced from the wastes of ferroalloy plant is discussed. The briquette produced by this technique exhibit high physical and metallurgical property and can replace the natural ore as a charge to some extent. Extruded briquettes (BREX) can be efficiently used as one of the essential charge component (up to 30% of the ore part of the charge) for the Silicomanganese smelting thus improving technical and economical parameters of the furnace and decreasing the self-cost of the Silicomanganese production.

ACS Style

Y. Rama Murthy; Gajanan U. Kapure; Sunil Kumar Tripathy; G.P. Sahu. Recycling of ferromanganese gas cleaning plant (GCP) sludge by novel agglomeration. Waste Management 2018, 80, 457 -465.

AMA Style

Y. Rama Murthy, Gajanan U. Kapure, Sunil Kumar Tripathy, G.P. Sahu. Recycling of ferromanganese gas cleaning plant (GCP) sludge by novel agglomeration. Waste Management. 2018; 80 ():457-465.

Chicago/Turabian Style

Y. Rama Murthy; Gajanan U. Kapure; Sunil Kumar Tripathy; G.P. Sahu. 2018. "Recycling of ferromanganese gas cleaning plant (GCP) sludge by novel agglomeration." Waste Management 80, no. : 457-465.

Journal article
Published: 01 July 2018 in Process Safety and Environmental Protection
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The present study explores the process of simultaneous roast-reduction and magnetic separation of blast furnace flue dust (BFD) and a low grade banded iron ore without using any extra reductant. The optical microscopic studies on the BFD sample revealed the presence of hematite, magnetite, silicates and unburnt carbon while the elemental mapping using Electron Probe Micro Analysis (EPMA) indicated the close association of silicates with Ca, K and Na bearing phases. The studies using the Scanning Electron Microscopy coupled with an Energy Dispersive X-ray Spectroscope (SEM-EDS) confirmed the presence of carbon both as an individual entity and in association with other phases as carbonates. The iron ore used was banded in nature and mostly consisted of hematite and quartz. Under statistically optimized conditions such as temperature: 850 °C, time: 90 min and BFD to ore ratio: 0.4, the process of reduction roasting followed by low intensity magnetic separation (LIMS) could yield an iron ore concentrate of ∼63% Fe at an iron recovery of ∼68% from the BFD with 32% Fe and banded iron ore with 47.2% Fe. Similar results were also obtained using the same BFD to ore ratio for a roasting temperature of 950 °C and a time period of 30 min. The products roasted at a high temperature of 1050 °C or at a temperature of 950 °C with a higher residence time of 120 min showed poor iron recovery and high grade in the LIMS magnetic fraction, which was attributed to the formation of feebly magnetic phases like wustite and fayalite.

ACS Style

Swagat S. Rath; Danda Srinivas Rao; Sunil Kumar Tripathy; Surendra K. Biswal. Characterization vis-á-vis utilization of blast furnace flue dust in the roast reduction of banded iron ore. Process Safety and Environmental Protection 2018, 117, 232 -244.

AMA Style

Swagat S. Rath, Danda Srinivas Rao, Sunil Kumar Tripathy, Surendra K. Biswal. Characterization vis-á-vis utilization of blast furnace flue dust in the roast reduction of banded iron ore. Process Safety and Environmental Protection. 2018; 117 ():232-244.

Chicago/Turabian Style

Swagat S. Rath; Danda Srinivas Rao; Sunil Kumar Tripathy; Surendra K. Biswal. 2018. "Characterization vis-á-vis utilization of blast furnace flue dust in the roast reduction of banded iron ore." Process Safety and Environmental Protection 117, no. : 232-244.

Journal article
Published: 20 February 2018 in Mineral Processing and Extractive Metallurgy Review
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ACS Style

Sunil Kumar Tripathy; Shivakumar I. Angadi; Nanda Kishor Patra; D. S. Rao. Comparative separation analysis of direct and reverse flotation of dolomite fines. Mineral Processing and Extractive Metallurgy Review 2018, 39, 339 -350.

AMA Style

Sunil Kumar Tripathy, Shivakumar I. Angadi, Nanda Kishor Patra, D. S. Rao. Comparative separation analysis of direct and reverse flotation of dolomite fines. Mineral Processing and Extractive Metallurgy Review. 2018; 39 (5):339-350.

Chicago/Turabian Style

Sunil Kumar Tripathy; Shivakumar I. Angadi; Nanda Kishor Patra; D. S. Rao. 2018. "Comparative separation analysis of direct and reverse flotation of dolomite fines." Mineral Processing and Extractive Metallurgy Review 39, no. 5: 339-350.

Journal article
Published: 01 January 2018 in Colloids and Surfaces A: Physicochemical and Engineering Aspects
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ACS Style

R.K. Dwari; S.I. Angadi; S.K. Tripathy. Studies on flocculation characteristics of chromite’s ore process tailing: Effect of flocculants ionicity and molecular mass. Colloids and Surfaces A: Physicochemical and Engineering Aspects 2018, 537, 467 -477.

AMA Style

R.K. Dwari, S.I. Angadi, S.K. Tripathy. Studies on flocculation characteristics of chromite’s ore process tailing: Effect of flocculants ionicity and molecular mass. Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2018; 537 ():467-477.

Chicago/Turabian Style

R.K. Dwari; S.I. Angadi; S.K. Tripathy. 2018. "Studies on flocculation characteristics of chromite’s ore process tailing: Effect of flocculants ionicity and molecular mass." Colloids and Surfaces A: Physicochemical and Engineering Aspects 537, no. : 467-477.

Technical paper
Published: 04 November 2017 in Transactions of the Indian Institute of Metals
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The article presents the reduction roasting followed by low intensity magnetic separation studies of a low grade Mn ore assaying 27.7% Mn and 26.1% Fe in order to obtain a Mn rich non-magnetic concentrate. The reflected light microscopic studies followed by the liberation studies of the as-received sample using quantitative mineralogical evaluation by scanning electron microscope suggested a poor liberation pattern of the constituent Mn and Fe minerals owing to a complex association of the different phases present. The reduction roasting studies carried out while varying different process parameters such as ore particle size, temperature, reductant content and residence time ended up with products containing 45–48% Mn with a Mn/Fe ratio of 5–6 at a yield of ~ 60% with the optimum level of conditions such as temperature: 800–850 °C, time: 90–120 min and charcoal: 10–12%. The scanning electron microscopy–energy dispersive X-ray spectroscopy studies of the roasted product reported manganite as the major Mn bearing phase while magnetite was found to be the major iron bearing phase.

ACS Style

Swagat S Rath; Sunil Tripathy; Danda S. Rao; Surendra K. Biswal. Characterization and Reduction Roasting Studies of an Iron Rich Manganese Ore. Transactions of the Indian Institute of Metals 2017, 71, 861 -872.

AMA Style

Swagat S Rath, Sunil Tripathy, Danda S. Rao, Surendra K. Biswal. Characterization and Reduction Roasting Studies of an Iron Rich Manganese Ore. Transactions of the Indian Institute of Metals. 2017; 71 (4):861-872.

Chicago/Turabian Style

Swagat S Rath; Sunil Tripathy; Danda S. Rao; Surendra K. Biswal. 2017. "Characterization and Reduction Roasting Studies of an Iron Rich Manganese Ore." Transactions of the Indian Institute of Metals 71, no. 4: 861-872.