Investigation on beneficiation of goethite-rich iron ores using reduction roasting followed by magnetic separation

Ravisankar, V.; Venugopal, R.; Bhat, H.K.

doi:10.1080/03719553.2017.1412876

Cited by 15 publications

(8 citation statements)

References 14 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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“…Depending on temperature and reduction conditions, goethite can be transformed to hematite, magnetite and other minerals suitable for magnetic separation [50]. Therefore, there are many studies on the treatment of goethite by reduction roasting followed by magnetic separation [50][51][52][53]. Sometimes, goethite contains a high content of phosphorus (P) and the existing phosphorus removal techniques is to thermally roasted the ore with or without alkaline additives followed by chemical or water leaching [54][55][56][57].…”

Section: Discussionmentioning

confidence: 99%

Occurrence of Sesquioxide in a Mid-Low Grade Collophane-Sedimentary Apatite Ore from Guizhou, China

Deng

Zhang

et al. 2020

Minerals

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Checking the presence of sesquioxide (Fe2O3, Al2O3) is helpful for its removal in advance. Therefore, the occurrence of sesquioxide in a mid-low grade calcareous-siliceous collophane ore (massive carbonate-apatite, also known as francolite) from Guizhou, China was determined by X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), field emission scanning electron microscope-energy dispersive X-ray spectrometry (FESEM-EDX) and Mineral Liberation Analyzer (MLA). The results show that iron mainly occurs as pyrite FeS2, goethite FeO(OH) and as substitution within dolomite Ca(Mg,Fe)(CO3)2, while aluminum is enriched in muscovite KAl2(AlSi3O10)(OH)2 and also found in apatite (F,CO3)CaPO4 and calcite CaCO3 due to isomorphism or adsorption. All these minerals are fine-grained, among which pyrite and goethite tend to be enriched in larger particles. Intergrowth is predominant in the six minerals’ locking. Pyrite is mainly intergrown with calcite, biotite and also included in apatite and muscovite, while the monomer pyrite appears as semi-automorphic fine grain with the liberation of 56.1%. Apatite particles are mainly intergrown with quartz and calcite. Most of goethite, dolomite, muscovite and calcite form intergrowth with apatite, with contents of 21.7%, 11.1%, 19.5% and 41%, respectively. The removal of pyrite, goethite, dolomite, muscovite and calcite in the ore is the key to reduce the contents of Fe2O3 and Al2O3. In the subsequent beneficiation, the ore must be fully ground. In addition to flotation, magnetic separation can also be considered to remove part of iron in ore. For the removal of aluminum from apatite, leaching method can be considered.

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“…Rich hematite ores from Krivoy Rog and KMA, containing 60-63 % of Fe, 6-8 % of silica, 0.045-0.84 % of sulfur and 0.02-0.09 % of phosphorus, which are developed by underground mining, are used without concentration after crushing and separation. Hematite rich ores, containing even 60-65 % of Fe, are subjected abroad to washing: coarse classes in screens with consequent concentration in jigging machines and fine classes -in classifiers; then fine ore classes are subjected to concentration via flotation or magnetic separation in high-intensive or highgradient separators [9][10][11]. Rich ores with coarse-layered texture (e.g.…”

Section: Review Of Concentration Technologies For Rich Iron Oresmentioning

confidence: 99%

Contrast range examination of rich iron ore from Mikhailovskoe deposit and evaluation of possibility of its preliminary concentration via physical methods

Ismagilov,

Yushina,

Dumov

2023

cisisr

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The paper presents the review of the main technologies for concentration of rich iron ores and factors having influence on selection of the technology and concentration parameters. The most important technological parameters at the leading concentration plants (both abroad and in Russia), which are processing rich iron ores, are observed. It is shown that even ores with Fe content more than 65 % are subjected to concentration abroad. At present time, only 15 % of iron ores in CIS can be directed to metallurgical processing without concentration, 65 % of iron ores are concentrated via simple routes, but 20 % of iron ores require use of combined concentration methods. The aim of this work was study of substantial composition of large-lump hematite ore at Mikhailovskoe deposit and determination of possible technological pre-concentration methods for rise of Fe content in sinter ore up to 53-55 %. Examination of mineral composition of grab and bulk samples displayed that oxidized ferriferous quartzites are characterized by thin-layered texture with alteration of ore-free layers and interlayers, which are enriched by hematite. Coarseness less than 2 mm for more than 45 % of material proved presence of essential amount of slightly structured mineral differences and high oxidation degree. The experiments on determination of possibility of technological preliminary concentration of large-piece rich hematite ore were carried out using gravitation, X-ray absorption (XRT) and electromagnetic (EM) methods, dry magnetic separation in weak and strong field. It was shown that preliminary concentration of large-piece rich hematite ore from Mikhailovskoe deposit is impossible due to the features of mineral composition (wide range of porosity of ore lumps, Fe content outside the ranges of XRT method use, presence of essential amount of martite with relict magnetite nuclei etc.).

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Investigation on beneficiation of goethite-rich iron ores using reduction roasting followed by magnetic separation

Cited by 15 publications

References 14 publications

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

Occurrence of Sesquioxide in a Mid-Low Grade Collophane-Sedimentary Apatite Ore from Guizhou, China

Contrast range examination of rich iron ore from Mikhailovskoe deposit and evaluation of possibility of its preliminary concentration via physical methods

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