Recovery of iron minerals from Indian iron ore slimes using colloidal magnetic coating

Singh, Satyavir; Sahoo, Harekrushna; Rath, Swagat S.; Sahu, Ashok Kumar; Das, B.

doi:10.1016/j.powtec.2014.08.065

Cited by 60 publications

(5 citation statements)

References 23 publications

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“…In the smelting separation process, solid carbon was employed as the reductant, and thus both fayalite and hercynite could be reduced. Additionally, CaO could promote the reduction of fayalite and hercynite by chemically reacting with Al 2 O 3…”

Section: Of 17mentioning

confidence: 99%

“…High aluminum iron ore (HAIO), a kind of polymetallic complex resources, is widely distributed in nature, which has a high comprehensive utilization value. Moreover, it is abundantly found in China, Australian, India and Indonesia [3]. Typically, it contains 5-20% Al 2 O 3 and 30-60% Fe, indicating that it is difficult to be used as a raw material for ironmaking [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron

Pan

Zhu

et al. 2019

Metals

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In this study, a novel process was established for extraction of Fe and Al from a complex high aluminum iron ore (33.43% Fe total and 19.09% Al 2 O 3 ). The main steps in the proposed process included pre-reducing high alumina iron ore and subsequent smelting to produce pig iron and rich-alumina slag, followed by alkaline leaching of the slag to obtain sodium aluminate solution and a clean slag. When smelting the pre-reduced high alumina iron ore pellets at 1625 • C for 30 min with a slag basicity of 0.40, the pig iron yielded 97.08% Fe and extracted 0.13% Al 2 O 3, together with an iron recovery of 94.54%. In addition, more than 68.93% Al 2 O 3 was recovered by leaching the slag, which was achieved by firstly roasted the slag at 900 • C for 2 h and then alkaline leaching at 95 • C for 2 h with a liquid-to-solid ratio of 10 mL/g. In addition, the alkaline leaching slag could potentially be used as raw material for construction purpose, which mainly consisted of SiO 2 and CaO.Metals 2020, 10, 57 2 of 17 remove aluminum from iron ore containing Fe total 52.94%, 9.95% Al 2 O 3 and 6.1% SiO 2 , and only 40% alumina was removed after 6 or 15 days of in situ leaching at 10% pulp density. Biological method could play a certain role in the separation of iron from alumina, but its effect may be poorer, especially the period is too lengthy compared to smelting processes.Smelting processes consist of coal-based direct reduction-magnetic separation, roasting-magnetic separation, and smelting separation [11][12][13]. It is effective to recover iron from low-grade refractory iron ore through coal-based direct reduction-magnetic separation. However, there is a problem that exists in this process, low reduction rate [14,15]. Zhou et al. [13] proposed a high temperature reduction followed by magnetic separation for high aluminum hematite-limonite ore treatment. Their findings indicated that approximately 90.25% of iron recovery was obtained, but the recovery of Al 2 O 3 was not considered. Sellaeg et al.[16] adopted a direct smelting reduction process to recover iron from red mud, and the result showed that only 70% of iron was recovered and an Al 2 O 3 -containing slag was obtained. He et al. [17] proposed a slag-iron bath smelting reduction process for the treatment of alumina-rich iron ore, and more than 90% iron was recovered using this method. It is worth noting that the smelting separation process can achieve the separation of iron and alumina. However, the slag could not be effectively used, resulting in a difficulty of extracting aluminum.Considering that the existing processes for HAIO treatment have highly energy consumption and are economically impractical, it is urgent to develop a more economical and valid process. In this work, a new process was developed through the pre-reduction of high alumina iron ore and subsequent smelting to produce pig iron and rich-alumina slag, followed by alkali leaching to extract aluminum and generate a clean slag for cement industry.

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Section: Of 17mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron

Pan

Zhu

et al. 2019

Metals

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“…As a result of its ecofriendly characteristics, HGMS has been applied in many scientific and industrial fields such as water treatment, − environmental remediation, , waste management, − chemical engineering, − bioengineering, , etc. The most important application of HGMS is in the field of mineral processing for recovering weakly magnetic minerals. − Many industrialized high-gradient magnetic separators have been developed. − …”

Section: Introductionmentioning

confidence: 99%

Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

Zheng

Jing

Sun

et al. 2022

ACS Sustainable Chem. Eng.

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High-gradient magnetic separation (HGMS) is indispensably applied in the rougher separation stage of refractory weakly magnetic minerals. The most difficult problem while processing refractory weakly magnetic minerals is the low selectivity of HGMS caused by the competing capture of magnetic valuable and gangue minerals. In this study, a paramagnetic fluid is introduced into HGMS and an innovative method, termed highgradient magnetic separation coupling with magnetic fluid (HGMSCMF), with a significantly high selectivity is proposed. A new competing force (magnetic repulsive force) generated by the magnetic fluid will enlarge the force difference of valuable and gangue minerals and improve selectivity. The relative magnetic force acting on the magnetic valuable and gangue minerals can be adjusted by varying the fluid volume susceptibility, with the optimal fluid susceptibility approaching that of gangue minerals. HGMSCMF experiments on an ilmenite ore using paramagnetic MnCl 2 solutions showed that the selectivity was remarkably improved by increasing MnCl 2 concentrations (fluid susceptibility). The TiO 2 grade and mass of magnetic products could be simultaneously improved by increasing the applied induction in HGMSCMF, whereas in conventional HGMS, the TiO 2 grade and recovery decreased and increased, respectively. HGMSCMF is applicable to various matrices (or separators), and a significantly improved TiO 2 grade (close to that of industrial concentrates) could be obtained with only one-stage HGMSCMF. The recycling of magnetic fluid and cost economy of HGMSCMF are also discussed and analyzed. HGMSCMF presents several advantages over conventional HGMS and has great application prospects for realizing the clean and efficient utilization of refractory weakly magnetic minerals or materials.

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“…Anastassakis [21] studied the separation of quartz from magnesite fines and showed that the attachment of fine magnetite onto quartz was possible in the presence of dodecylamine and kerosene in the pH range of 6-11. Prakash et al and Singh et al [22,23] discussed the recovery of iron minerals from Indian iron ore slimes using colloidal magnetic coating, followed by magnetic separation. The selective magnetic separation of pentlandite from serpentine with magnetite was studied extensively [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Microcrystalline Graphite from Quartz Using Magnetic Seeding

Liang

Peng

et al. 2019

Minerals

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Efficient beneficiation of microcrystalline graphite remains a challenge. Selective recovery of microcrystalline graphite from quartz using hydrophobized magnetite as magnetic seed is studied in this work. Magnetite was hydrophobized by the surface coating of sodium oleate. The hydrophobic agglomerates were then separated by magnetic separation. Sedimentation experiments were performed to study the adhesion of microcrystalline graphite and quartz to magnetite particles. The results showed that hydrophobized magnetite led to a higher microcrystalline graphite recovery than that of the original magnetite, due to the higher probability to bond with microcrystalline graphite. However, the hydrophobization of the magnetite surface had an insignificant effect on its interaction with quartz. The force analysis based on the extended Derjaguin-Landau-Verwey-Overbeek (EDLVO) theory indicated that the total attractive interaction between hydrophobized magnetite and microcrystalline graphite were obviously stronger than that between hydrophobized magnetite and quartz, resulting in the selective aggregation between hydrophobized magnetite and microcrystalline graphite.

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Recovery of iron minerals from Indian iron ore slimes using colloidal magnetic coating

Cited by 60 publications

References 23 publications

An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron

An Innovative Technique for Comprehensive Utilization of High Aluminum Iron Ore via Pre-Reduced-Smelting Separation-Alkaline Leaching Process: Part I: Pre-Reduced-Smelting Separation to Recover Iron

Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

Recovery of Microcrystalline Graphite from Quartz Using Magnetic Seeding

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