The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Claude Bazin - One of the best experts on this subject based on the ideXlab platform.
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The Use of Process Analysis and Simulation to Identify Paths to Improve the Operation of an Iron Ore Gravity Concentration Circuit
Advances in Chemical Engineering and Science, 2020Co-Authors: Maryam Sadeghi, Claude BazinAbstract:The processing of iron ore to recover the valuable iron oxide minerals is commonly carried out using spiral concentrators that separate valuable minerals from non-valuable ones on the basis of the specific Gravity of minerals. This paper shows that the analysis of the operation of spirals should not only focus on the minerals (as it is usually the case), but should also consider the particle size of these minerals. Indeed, the sampling of two industrial iron ore circuits and the data processing of the resulting measurements show that unexpectedly about 10% of the coarse heavy iron oxide minerals are not recovered by the spirals of the two circuits. Tests conducted by an independent research center confirm this plant observation. The pilot plant tests also show that the wash water flowrate addition may adversely affect the recovery of coarse heavy mineral particles. A mathematical model for the spiral was implemented into a simulator for an iron ore Gravity Concentration circuit. The simulator shows a potential 0.7% increase of iron recovery by simply changing the strategy used to distribute the wash water between the rougher and the cleaner/recleaner spirals of the circuit. The simulator also shows that the introduction of a hydraulic classifier into the Gravity Concentration circuit yields a marginal improvement to the performances of the circuit.
Maryam Sadeghi - One of the best experts on this subject based on the ideXlab platform.
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The Use of Process Analysis and Simulation to Identify Paths to Improve the Operation of an Iron Ore Gravity Concentration Circuit
Advances in Chemical Engineering and Science, 2020Co-Authors: Maryam Sadeghi, Claude BazinAbstract:The processing of iron ore to recover the valuable iron oxide minerals is commonly carried out using spiral concentrators that separate valuable minerals from non-valuable ones on the basis of the specific Gravity of minerals. This paper shows that the analysis of the operation of spirals should not only focus on the minerals (as it is usually the case), but should also consider the particle size of these minerals. Indeed, the sampling of two industrial iron ore circuits and the data processing of the resulting measurements show that unexpectedly about 10% of the coarse heavy iron oxide minerals are not recovered by the spirals of the two circuits. Tests conducted by an independent research center confirm this plant observation. The pilot plant tests also show that the wash water flowrate addition may adversely affect the recovery of coarse heavy mineral particles. A mathematical model for the spiral was implemented into a simulator for an iron ore Gravity Concentration circuit. The simulator shows a potential 0.7% increase of iron recovery by simply changing the strategy used to distribute the wash water between the rougher and the cleaner/recleaner spirals of the circuit. The simulator also shows that the introduction of a hydraulic classifier into the Gravity Concentration circuit yields a marginal improvement to the performances of the circuit.
Ratnakar Singh - One of the best experts on this subject based on the ideXlab platform.
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Processing of low grade iron ore from Singhbhum-north Orissa craton using Gravity Concentration techniques
2007Co-Authors: R K Rath, Shobhana Dey, M K Mohanta, Ratnakar Singh, Vinod Kumar, K K BhattacharyyaAbstract:Processing of low grade hematitic iron ores is inevitable as a result of depletion of high grade ores and rapid trend of increase in production of iron and steel in recent times. In view of this, beneficiation studies were carried out on a low grade hematitic iron ore based on the mineralogical characteristics of the sample. Basically, Gravity Concentration techniques were used for separation of iron bearing minerals from associated gangues. The sample was sized into four fractions keeping in view of their usage as lump -30+8 mm feed to blast furnace and fines-1 -8+1 mm and fines-2 -1+0.15 mm for sinter feed. The ultrafines (-0.15mm) can be used for as green pellets DRI feed. Suitable Gravity Concentration techniques were applied to different sized fractions for their iron enrichment. The washed lumps of -30+8 mm size, when subjected to heavy media separation at specific Gravity 2.9, there is appreciable enrichment in the quality with 92.5% yield. Jigging of washed fines-1, indicated that the concentrate with yield of 45.0%, assaying 62.11% Fe could be obtained. Tabling of washed fines-2 showed that there is a substantial improvement in Fe (62.53%) 42.6 % yield and reduction of silica and alumina in the concentrate. Desliming of the -0.15 mm fraction using hydrocyclone was carried out to get a cyclone underflow product. The cyclone underflow was subsequently treated in a Wilfley table with slime deck to enrich it further. The tabling could produce about 15.7% yield with 63.9% Fe. Based on the above studies, process flow-sheet was developed for low grade iron ore from Singhbhum-north Orissa craton using various Gravity Concentration techniques, so as to produce reasonable grade of lumps and fines.
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Gravity Concentration of Iron Ore
2007Co-Authors: R K Rath, Ratnakar SinghAbstract:Gravity Concentration process is the oldest beneficiation method known to mankind. This is a physical process and exploits the differences in densities of minerals to bring about a separation. Although with the advent of froth flotation, the relative importance of Gravity concentrat-ion has declined in twentieth century but still on an average higher tonnage of material is treated by Gravity Concentration than flotation. The Gravity separation processes are comparatively cheap and environmentally friendly. It finds immense application in the processing of iron ores besides coal, beach sands, gold, diamonds, platinum, baryte, fluorspar, tin, tungsten ores etc.
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Gravity Concentration of fines and ultrafines
1997Co-Authors: Ratnakar Singh, K K Bhattacharyya, S C MaulikAbstract:Concentration of fines by Gravity methods remains one of the challenging problems to the world mineral industry. Considering the increasing losses of mineral values and the search for an economic process, it has been the major concern of the researchers and the practicing engineers to develop an efficient fine Gravity separator. The development of some of the recent fine Gravity separators with the application of high centrifugal forces has resulted in improvement in the separation efficiency. In the last four de¬cades extensive studies have been carried out at National Metallurgical Laboratory (NML), Jamshedpur to develop Gravity based processes for low grade ores, fines and industrial wastes involving the conventional separators to the latest equipment like multi-Gravity separator for their economic exploitation. In this paper an attempt has been made to briefly present a review of the Gravity Concentration processes with a particular reference to the recent advances in the processing of fines. The salient results obtained from the recent studies carried out on beneficiation of lean grade finely disseminated tungsten ore, iron ore slimes and chromite slimes at NML using some fine Gravity separators like Bartles-Motley Vanner GEC-duplex concentrator and MGS are discussed.
Zhang Chonghui - One of the best experts on this subject based on the ideXlab platform.
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Experimental study on comprehensive recovery of gold,silver,copper and sulphur from copper-bearing high-sulphur gold concentrate
Mining & Processing Equipment, 2012Co-Authors: Zhang ChonghuiAbstract:A gold concentrate contained gold of 36.25g/t,copper of 2.37% and sulphur of 46.83%.In order to effectively recover valuable elements,single flotation process and combination process of Gravity Concentration and flotation were separately conducted.And then the combination process of Gravity Concentration and flotation was determined after lots of experimental study.The recovery rate of gold,silver and copper reached 96.19%,87.91% and 96.45% in the concentrate,and sulphur recovery rate was 100%.The mineral resources were recovered and utilized well.
R K Rath - One of the best experts on this subject based on the ideXlab platform.
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characterization and beneficiation of dry iron ore processing plant reject fines to produce sinter pellet grade iron ore concentrate
Mining Metallurgy & Exploration, 2019Co-Authors: Prashant Dixit, Veerendra Singh, Dilip Makhija, A K Mukherjee, A Bhatanagar, R K RathAbstract:Characterization and beneficiation of dry iron ore processing plant reject fines of Khondbond region, India, was investigated. Different characterization techniques viz. size analysis, size-wise chemical and density analysis, X-ray diffraction analysis, sink-float analysis, thermo gravimetric analysis, scanning electron microscopy, and QEMSCAN were carried out. Based on characterization results, two process flow sheets comprising wet screening followed by conventional Gravity Concentration and two stage classification with different beneficiation routes were used to recover the iron values from reject fines containing 58.73% Fe, 5.54% Al2O3, and 6.6% SiO2. Finally, suggested flow sheet comprising of two stage classification and advance Gravity Concentration followed by the combination of grinding, classification, and froth flotation produced iron concentrate of 2.36% Al2O3 with 75.8% yield which can be used in sinter/pellet making.
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Characterization and Beneficiation of Dry Iron Ore Processing Plant Reject Fines to Produce Sinter/Pellet Grade Iron Ore Concentrate
Mining Metallurgy & Exploration, 2019Co-Authors: Prashant Dixit, Dilip Makhija, A K Mukherjee, A Bhatanagar, V. Singh, R K RathAbstract:Characterization and beneficiation of dry iron ore processing plant reject fines of Khondbond region, India, was investigated. Different characterization techniques viz. size analysis, size-wise chemical and density analysis, X-ray diffraction analysis, sink-float analysis, thermo gravimetric analysis, scanning electron microscopy, and QEMSCAN were carried out. Based on characterization results, two process flow sheets comprising wet screening followed by conventional Gravity Concentration and two stage classification with different beneficiation routes were used to recover the iron values from reject fines containing 58.73% Fe, 5.54% Al_2O_3, and 6.6% SiO_2. Finally, suggested flow sheet comprising of two stage classification and advance Gravity Concentration followed by the combination of grinding, classification, and froth flotation produced iron concentrate of 2.36% Al_2O_3 with 75.8% yield which can be used in sinter/pellet making.
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Processing of low grade iron ore from Singhbhum-north Orissa craton using Gravity Concentration techniques
2007Co-Authors: R K Rath, Shobhana Dey, M K Mohanta, Ratnakar Singh, Vinod Kumar, K K BhattacharyyaAbstract:Processing of low grade hematitic iron ores is inevitable as a result of depletion of high grade ores and rapid trend of increase in production of iron and steel in recent times. In view of this, beneficiation studies were carried out on a low grade hematitic iron ore based on the mineralogical characteristics of the sample. Basically, Gravity Concentration techniques were used for separation of iron bearing minerals from associated gangues. The sample was sized into four fractions keeping in view of their usage as lump -30+8 mm feed to blast furnace and fines-1 -8+1 mm and fines-2 -1+0.15 mm for sinter feed. The ultrafines (-0.15mm) can be used for as green pellets DRI feed. Suitable Gravity Concentration techniques were applied to different sized fractions for their iron enrichment. The washed lumps of -30+8 mm size, when subjected to heavy media separation at specific Gravity 2.9, there is appreciable enrichment in the quality with 92.5% yield. Jigging of washed fines-1, indicated that the concentrate with yield of 45.0%, assaying 62.11% Fe could be obtained. Tabling of washed fines-2 showed that there is a substantial improvement in Fe (62.53%) 42.6 % yield and reduction of silica and alumina in the concentrate. Desliming of the -0.15 mm fraction using hydrocyclone was carried out to get a cyclone underflow product. The cyclone underflow was subsequently treated in a Wilfley table with slime deck to enrich it further. The tabling could produce about 15.7% yield with 63.9% Fe. Based on the above studies, process flow-sheet was developed for low grade iron ore from Singhbhum-north Orissa craton using various Gravity Concentration techniques, so as to produce reasonable grade of lumps and fines.
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Gravity Concentration of Iron Ore
2007Co-Authors: R K Rath, Ratnakar SinghAbstract:Gravity Concentration process is the oldest beneficiation method known to mankind. This is a physical process and exploits the differences in densities of minerals to bring about a separation. Although with the advent of froth flotation, the relative importance of Gravity concentrat-ion has declined in twentieth century but still on an average higher tonnage of material is treated by Gravity Concentration than flotation. The Gravity separation processes are comparatively cheap and environmentally friendly. It finds immense application in the processing of iron ores besides coal, beach sands, gold, diamonds, platinum, baryte, fluorspar, tin, tungsten ores etc.
