A large volume of overburden and mine wastes is generated during the extraction and beneficiation of the low grade ores. The waste low grade manganiferous iron ore fine from southern part of India was studied for reco...A large volume of overburden and mine wastes is generated during the extraction and beneficiation of the low grade ores. The waste low grade manganiferous iron ore fine from southern part of India was studied for recovery of iron values. The chemical assay of the sample is 52.36% Fe, 4.75% Mn, 8.5% SiO2 and 2.82% Al2O3. The characterization study of the sample indicates the presence of microplaty hematite, goethite, pyrolusite, cryptomelane with minor amount of quartz and kaolinite. The beneficiation study of the sample does not respond to the conventional route of desliming the ground feed followed by gravity separation and magnetic separation. Therefore, an alternative technique of reduction roasting using a producer gas was attempted at different conditions. The characterization of roasted product reveals the phase transformation to magnetite and microplaty magnetite. The low intensity magnetic separation conducted with the roasted products generated at optimal condition shows that 70% concentrate having 64.5% Fe and 1.87% Mn could be produced. The high manganese in the concentrate works as an additive for making pellet with enhancement in pellet strength and drop in reducibility. Utilization of mines waste has significant impact on mineral resources and environmental hazard.展开更多
The recovery of high-concentrations manganese(Mn)ion(tens of thousands of milligrams per liter)from hydrometallurgical tailing water poses considerable challenges,leading to resource wastage and environmental concerns...The recovery of high-concentrations manganese(Mn)ion(tens of thousands of milligrams per liter)from hydrometallurgical tailing water poses considerable challenges,leading to resource wastage and environmental concerns.To address this,this study proposes the nucleation crystallization pelleting process,a technique that facilitates the adherence of Mn ion onto the surface of specialized seeds,enabling the formation of nucleation pellets for recovery.A multistage series reactor was used under optimized conditions(particle sizes of 60-80 mesh,sodium carbonate dosage of 2500 mg/L influent pH of 3,and upflow velocity of 50 m/h).A stable and continuous operation of the reactor resulted in a Mn ion removal rate of>99%.Laser particle size analysis and scanning electron microscopy results revealed that seeds growth occurred progressively,forming a loose and porous surface structure that enhanced the attachment of manganese carbonate(MnCO_(3))particles.X-ray diffraction,X-ray photoelectron spectroscopy and zeta potential analyses results demonstrated that Mn ion predominantly adhered to seed surface in the form of MnCO_(3) with purity detection confirming nucleation pellets achieving a content of>95%.This study demonstrates the high efficiency and practical applicability of this nucleation crystallization pelleting process and highlights its potential to significantly reduce resource wastage and environmental impacts,offering a practical and effective solution for recovering high-concentrated Mn ion from hydrometallurgical tailing water.展开更多
文摘A large volume of overburden and mine wastes is generated during the extraction and beneficiation of the low grade ores. The waste low grade manganiferous iron ore fine from southern part of India was studied for recovery of iron values. The chemical assay of the sample is 52.36% Fe, 4.75% Mn, 8.5% SiO2 and 2.82% Al2O3. The characterization study of the sample indicates the presence of microplaty hematite, goethite, pyrolusite, cryptomelane with minor amount of quartz and kaolinite. The beneficiation study of the sample does not respond to the conventional route of desliming the ground feed followed by gravity separation and magnetic separation. Therefore, an alternative technique of reduction roasting using a producer gas was attempted at different conditions. The characterization of roasted product reveals the phase transformation to magnetite and microplaty magnetite. The low intensity magnetic separation conducted with the roasted products generated at optimal condition shows that 70% concentrate having 64.5% Fe and 1.87% Mn could be produced. The high manganese in the concentrate works as an additive for making pellet with enhancement in pellet strength and drop in reducibility. Utilization of mines waste has significant impact on mineral resources and environmental hazard.
基金supported by the National Natural Science Foundation of China(No.52230001)the Project of Qinchuangyuan Platform“Scientist+Engineer”Team of Shaanxi Province,China(No.2023KXJ-149).
文摘The recovery of high-concentrations manganese(Mn)ion(tens of thousands of milligrams per liter)from hydrometallurgical tailing water poses considerable challenges,leading to resource wastage and environmental concerns.To address this,this study proposes the nucleation crystallization pelleting process,a technique that facilitates the adherence of Mn ion onto the surface of specialized seeds,enabling the formation of nucleation pellets for recovery.A multistage series reactor was used under optimized conditions(particle sizes of 60-80 mesh,sodium carbonate dosage of 2500 mg/L influent pH of 3,and upflow velocity of 50 m/h).A stable and continuous operation of the reactor resulted in a Mn ion removal rate of>99%.Laser particle size analysis and scanning electron microscopy results revealed that seeds growth occurred progressively,forming a loose and porous surface structure that enhanced the attachment of manganese carbonate(MnCO_(3))particles.X-ray diffraction,X-ray photoelectron spectroscopy and zeta potential analyses results demonstrated that Mn ion predominantly adhered to seed surface in the form of MnCO_(3) with purity detection confirming nucleation pellets achieving a content of>95%.This study demonstrates the high efficiency and practical applicability of this nucleation crystallization pelleting process and highlights its potential to significantly reduce resource wastage and environmental impacts,offering a practical and effective solution for recovering high-concentrated Mn ion from hydrometallurgical tailing water.
