Simultaneously Roasting and Magnetic Separation to Treat Low Grade Siderite and Hematite Ores

Chun, Tiejun; Zhu, Deqing; Pan, Jian

doi:10.1080/08827508.2014.928620

Cited by 53 publications

(7 citation statements)

References 5 publications

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“…A reduction roasting-magnetic separation process can modify the distribution of aluminium and iron phases. In the reduction roasting process, weak magnetic iron-containing minerals such as hematite can be converted into strong ones, e.g., magnetite, or even metallic iron, which can be easily separated after magnetic separation [58][59][60]. Higher reductant dosage may result in the formation of magnetite.…”

Section: Magnetic Separation Efficiency After Reduction Roasting Of Bmentioning

confidence: 99%

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

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This laboratory study investigates selective grinding and beneficiation options for a Greek bauxite ore. First, a series of batch grinding tests were carried out in order to investigate the grinding behavior of the ore and the effect of the material filling volume (fc) on the distribution of aluminium- and iron-containing phases. Then, the ground ore was subjected to magnetic separation either as received or after reduction roasting in order to further explore potential beneficiation options. The results showed that grinding of the ore exhibits non-first order behavior, while the breakage rate varies with grinding time. Additionally, Al2O3 tends to concentrate in the coarser than 0.300 mm product fraction, while fc 10% and 2 min of grinding time are considered optimum conditions for good distribution of Al2O3 and Fe2O3. When different product fractions were subjected to magnetic separation, it was seen that the non-magnetic product obtained from the 0.300–1.18 mm fraction was more rich in Al2O3. In this fraction, the Al2O3 content increased from 58 wt% in the feed to 67.9 wt%, whereas the Fe2O3 content decreased from 22.4 wt% in the feed to 13.5 wt%. When the ore was subjected to a two-step treatment, involving reduction roasting followed by magnetic separation, the Fe2O3 grade decreased from 20.8 to 5.1 wt%, but in this case the recovery was very low.

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Section: Magnetic Separation Efficiency After Reduction Roasting Of Bmentioning

confidence: 99%

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

2020

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“…In addition, during the roasting process, siderite transforms to magnetite along with producing CO, but hematite needs CO to reduce into magnetite. So the process of simultaneously roasting and magnetic separation was developed to treat low-grade siderite and hematite ores (S + H) without adding any reductant (Chun, Zhu and Pan 2015). Chun et al studied the effect of mass ratio of S-to-H (siderite ore to hematite ore) on the separation indexes of iron concentrate.…”

Section: Resultsmentioning

confidence: 99%

Thermal decomposition behaviour and kinetics of Xinjiang siderite ore

Luo

Zhu

Pan

et al. 2016

Mineral Processing and Extractive Metallurgy

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In order to provide a better theoretical foundation for utilisation of Xinjiang siderite resources in China, its thermal decomposition behaviour was studied in neutral and oxidising atmospheres by employing thermodynamics analysis, chemical titration, thermogravimetric, and X-ray diffraction means. Isothermal experiments were conducted to investigate the thermal decomposition kinetics of siderite lump in a weakly oxidising atmosphere at 500-850°C. The results reveal that siderite has self-magnetisation characteristics under controlled conditions, and the phase evolution process and final products of decomposition depend temperature and atmosphere. The phase transformation process in weak oxidising atmosphere follows the steps as: FeCO

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“…The gangue particle in the magnetic concentrate is embedded in the particle of the metallic iron, which indicates it is very difficult to remove the residual gangue in magnetic concentrate. Compared with the traditional recovery of iron from iron ores, the operation cost of adding a borax reduction roasting to treat the pyrite cinder is high, but the technology of adding borax roasting and magnetic separation opens the way to recover iron from the pyrite cinder [17][18][19].…”

Section: Discussionmentioning

confidence: 99%

Preparation of Metallic Iron Powder from Pyrite Cinder by Carbothermic Reduction and Magnetic Separation

Long

Chun

et al. 2016

Metals

Self Cite

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Abstract:The reduction and magnetic separation procedure of pyrite cinder in the presence of a borax additive was performed for the preparation of reduced powder. The effects of borax dosage, reduction temperature, reduction time and grinding fineness were investigated. The results show that when pyrite cinder briquettes with 5% borax were pre-oxidized at 1050˝C for 10 min, and reduced at 1050˝C for 80 min, with the grinding fineness (<0.44 mm) passing 81%, the iron recovery was 91.71% and the iron grade of the magnetic concentrate was 92.98%. In addition, the microstructures of the products were analyzed by optical microscope, scanning electron microscope (SEM), and mineralography, and the products were also studied by the X-ray powder diffraction technique (XRD) to investigate the mechanism; the results show that the borax additive was approved as a good additive to improve the separation of iron and gangue.

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Simultaneously Roasting and Magnetic Separation to Treat Low Grade Siderite and Hematite Ores

Cited by 53 publications

References 5 publications

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Thermal decomposition behaviour and kinetics of Xinjiang siderite ore

Preparation of Metallic Iron Powder from Pyrite Cinder by Carbothermic Reduction and Magnetic Separation

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