Pilot-scale extraction of iron from flotation tailings via suspension magnetization roasting in a mixture of CO and H2 followed by magnetic separation

Tang, Zhidong; Zhang, Qi; Sun, Yongsheng; Gao, Peng; Han, Yuexin

doi:10.1016/j.resconrec.2021.105680

Cited by 72 publications

(12 citation statements)

References 44 publications

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“…The following are the working parameters: acceleration voltage of 30 kV, resolution of 3.0 nm, and magnification of 8−300,000 times. 30…”

Section: Methodsmentioning

confidence: 99%

“…The surface morphologies and elemental analysis of leaching residues were observed by secondary electron imaging and backscattered electron imaging (BSE) using a Quanta 650 scanning electron microscope (FEI, Hillsboro, USA) coupled with a double X-ray spectrometer (AMETEK, Inc., Berwyn, USA) for electron image acquisition and elemental analysis, respectively. The following are the working parameters: acceleration voltage of 30 kV, resolution of 3.0 nm, and magnification of 8–300,000 times. , …”

Section: Methodsmentioning

confidence: 99%

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New Insights into the Penetration Depth of Sulfuric Acid and Leaching Effect in the Sulfuric Acid Curing-Leaching Process of Vanadium-Bearing Stone Coal

Han

Jin

et al. 2021

ACS Omega

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In the process of sulfuric acid curing-leaching vanadium-bearing stone coal, the curing effect is very important. The main purpose of this study is to capture the difference in the curing effect between coarse and fine stone coal, with a V 2 O 5 content of 0.88%. In this work, the effects of various factors such as sulfuric acid concentration, curing time, curing temperature, and different agents for curing on the leaching efficiency of vanadium were investigated by the comparison of the two size fractions. The results showed that the leaching efficiency of vanadium was 87.65% under the optimum curing conditions of 25 wt % sulfuric acid, curing time of 8 h, and curing temperature of 130 °C. It was clearly found that, under the same curing condition, the curing effect of fine stone coal was better than that of coarse stone coal. The penetration part of stone coal particles by sulfuric acid was loose, while the non-penetration part was dense after acid curing. Moreover, the penetration depth of sulfuric acid into the particles was mainly 0.5− 0.7 mm on average. There was more sericite/illite in coarse leaching residues, which were mostly dense and hard carbonaceous siliceous slate. Thus, sulfuric acid was difficult to penetrate into and reach the interior of the particle, which resulted in that the leaching efficiency of coarse vanadium-bearing stone coal ore was lower than that of fine vanadium-bearing stone coal ore.

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“…The following are the working parameters: acceleration voltage of 30 kV, resolution of 3.0 nm, and magnification of 8−300,000 times. 30…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

New Insights into the Penetration Depth of Sulfuric Acid and Leaching Effect in the Sulfuric Acid Curing-Leaching Process of Vanadium-Bearing Stone Coal

Han

Jin

et al. 2021

ACS Omega

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“…If the roasting time is too long, the iron ore will lead to excessive reduction, which is consistent with the dissatisfactory reduction process with the higher roasting temperature. Adjusting the roasting time to a suitable range can be conducive to the reduction and magnetization process [34,35]. To optimize the roasting time, a series of roasting and separation experiments were designed with different roasting times.…”

Section: Effect Of Roasting Timementioning

confidence: 99%

The Efficient Improvement of Original Magnetite in Iron Ore Reduction Reaction in Magnetization Roasting Process and Mechanism Analysis by In Situ and Continuous Image Capture

et al. 2021

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Magnetization roasting followed by magnetic separation is considered an effective method for recovering iron minerals. As hematite and magnetite are the main concomitant constituents in iron ores, the separation index after the magnetization roasting will be more optimized than with only hematite. In this research, the mechanism of the original magnetite improving iron ore reduction during the magnetization roasting process was explored using ore fines and lump ore samples. Under optimum roasting conditions, the iron grade increased from 62.17% to 65.22%, and iron recovery increased from 84.02% to 92.02% after separation, when Fe in the original magnetite content increased from 0.31% to 8.09%, although the Fe masses in each sample were equal. For lump ores with magnetite and hematite intergrowth, the method of in situ and continuous image capture for microcrack generation and the evolution of the magnetization roasting process was innovatively examined with a laser scanning confocal microscope (LSCM) with confocal technology and 3D morphologic technology for the first time. The naturally uneven areas, protogenetic pore edges, and magnetite and hematite edges provided active sites for reduction reactions. The microcracks gradually evolved from the lump ore surface and the edges of magnetite and hematite, which had a direct connection with the efficient improvement in ore reduction.

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“…In order to resolve this problem, reduction roastingmagnetic separation technology was proposed for extracting metals from refractory iron-containing resources such as red mud, [15,16] copper slag, [17] iron tailings, [18] vanadium tailings, [19] and cyanide tailings. [20] Furthermore, the magnetization roasting method is widely employed to convert weakly magnetic hematite and rare earth minerals into magnetite, thereby enhancing their magnetic properties and improving the separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Separation of Iron and Rare Earths from Low‐Intensity Magnetic Separation (LIMS) Tailings through Magnetization Roasting‐Magnetic Separation

Hou,

Wang,

Zhang

et al. 2023

ChemistryOpen

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Low‐intensity magnetic separation tailings (LIMS tailings) are a common by‐product obtained after magnetite magnetic separation. In this article, various techniques such as chemical analysis, X‐ray diffraction, ICP‐MS, and Mineral Liberation Analysis (MLA) were employed to investigate the LIMS tailings. The primary iron‐bearing mineral identified was hematite and rare earth minerals were monazite and bastnaesite. The main gangue species was fluorite with small amounts of dolomite and amphibole. Due to the weak magnetism of hematite and rare earth minerals, magnetic separation has low efficiency. However, magnetization roasting‐magnetic separation is an effective method to recover hematite. The present study focuses on the separation of iron and rare earth from LIMS tailings through magnetization roasting‐magnetic separation. The results demonstrate that with a roasting temperature of 650 °C, a roasting time of 60 min, a slurry concentration solid‐liquid ratio of 25 : 1, a rough magnetic field intensity of 0.16 T, and a selected magnetic field intensity of 0.10 T, the iron grade in the magnetic concentrate increases to 65.49 % and an iron recovery rate of 65.16 % can be achieved. The XRD patterns of magnetic separation concentrate show that the main mineral phases in concentrate are magnetite (Fe3O4) and fluorite (CaF2), which can be removed by grinding and reverse flotation fluorite to obtain a high‐grade iron concentrate. The REO grade of magnetic separation tailings is 11.98 %, and its recovery rate is 97.96 %. Consequently, rare earth can be effectively extracted and separated after the subsequent flotation‐leaching process.

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Pilot-scale extraction of iron from flotation tailings via suspension magnetization roasting in a mixture of CO and H2 followed by magnetic separation

Cited by 72 publications

References 44 publications

New Insights into the Penetration Depth of Sulfuric Acid and Leaching Effect in the Sulfuric Acid Curing-Leaching Process of Vanadium-Bearing Stone Coal

New Insights into the Penetration Depth of Sulfuric Acid and Leaching Effect in the Sulfuric Acid Curing-Leaching Process of Vanadium-Bearing Stone Coal

The Efficient Improvement of Original Magnetite in Iron Ore Reduction Reaction in Magnetization Roasting Process and Mechanism Analysis by In Situ and Continuous Image Capture

Separation of Iron and Rare Earths from Low‐Intensity Magnetic Separation (LIMS) Tailings through Magnetization Roasting‐Magnetic Separation

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