Recovery of iron from hazardous tailings using fluidized roasting coupling technology

Tang, Zhidong; Gao, Peng; Li, Yanjun; Han, Yuexin; Li, Wenbo; Butt, Stephen; Zhang, Yahui

doi:10.1016/j.powtec.2019.11.074

Cited by 41 publications

(7 citation statements)

References 37 publications

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“…[ 12 ] This physical separation process has motivated the production of works that study the recovery of rare earth minerals from iron oxide‐silicate‐rich tailings, [ 13 ] the concentration of fine low‐grade hematite, [ 14 ] and the recycling of iron from hazardous tailings through fluidized roasting followed by magnetic separation. [ 15 ]…”

Section: Introductionmentioning

confidence: 99%

“…[12] This physical separation process has motivated the production of works that study the recovery of rare earth minerals from iron oxide-silicaterich tailings, [13] the concentration of fine low-grade hematite, [14] and the recycling of iron from hazardous tailings through fluidized roasting followed by magnetic separation. [15] Besides magnetic separation, the thermal reduction process has been investigated for the purpose of recovering iron from residues in studies about reducing pellets made from electric arc furnace dust using natural gas and the investigation of carbothermal reduction of electric arc furnace dust briquettes in a microwave oven. [16,17] In this type of study, which uses fine raw materials, agglomeration processes to produce pellets, sinter, or briquettes are required to avoid clogs in reactors.…”

Section: Introductionmentioning

confidence: 99%

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Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

et al. 2020

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The volume of tailings produced by the extractive industry has been increasing due to the processing of the low-grade ore. This issue can cause environmental accidents and require significant investment to control the disposal of tailings. Therefore, this study aims to recover iron from zinc mine tailings by wet magnetic separation followed by the carbothermal reduction of self-reducing briquettes. Two magnetic separation routes were investigated to concentrate iron. Zinc mine tailings were processed by route I, in a rougher stage followed by a scavenger stage; and route II, in a rougher stage followed by a cleaner stage. The carbothermal reductions were performed using self-reducing briquettes composed of Fe concentrate from the route with high Fe content and charcoal. The products were analyzed by scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), x-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), and volumetric chemical analysis. Magnetic separation route II provided the highest-grade Fe concentrate, 52% Fe, while route I provided 33% Fe. In the carbothermal reductions, a metallization degree of 98% in the Fe concentrate briquette, 97% in the briquette with a 10% replacement of its raw material by Fe concentrate, and 99% in the hematite briquette was reached. The replacement of raw material by Fe concentrate showed no significant change in Fe recovery. Considering the whole process, magnetic separation and carbothermal reduction, the recovery of Fe from the zinc mine tailings was 67%. Therefore, the process route suggested in this study will not only reduce tailings disposal and consequently the risk of environmental accidents, but it will also provide profitable raw material for the steel industry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

et al. 2020

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“…To face the considerable harm of tailings, using IOTs safely and efficiently has been a hot topic of social concern [7,8]. Over the years, considerable research on recycling iron tailings has been carried out in various fields [9,10]. Considering that the major chemical components of IOTs are SiO 2 , Al 2 O 3 , Fe 2 O 3, and CaO, using IOTs to prepare construction and building materials has attracted much attention [11].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Yang¹,

Chen²,

Sun³

et al. 2022

Journal of Renewable Materials

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Herein, micro iron ore tailings (micro-IOTs) were prepared by wet-grinding and applied to improve sulphoaluminate cement (SAC) performance. The physicochemical properties of micro-IOTs were investigated by particle size analysis, XRD, and XPS. The hydrates trait and the hydration mechanism of micro-IOTs-SAC composite were studied by XRD, TGA, MIP, and SEM. The results demonstrated that micro-IOTs with an average grain diameter of 517 nm could be obtained by wet-grinding. The setting time of SAC gradually decreased with increasing micro-IOTs content. By adding 2% micro-IOTs, the compressive strengths of SAC pastes were enhanced about 22% and 10% at 4 h and 28 d, respectively. Moreover, the addition of micro-IOTs accelerated ettringite precipitation and changed its morphology, resulting in early strength improvement of the binary system. And increased later strength by micro-IOTs was closely related to the high content of AH 3 , fine pore structure, and high hydration degree of SAC. The findings suggested one new approach to utilize iron ore tailings in cementbased materials.

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“…To address this urgent issue, several researchers have attempted to replace Portland cement (PC) with supplementary cementitious materials (SCMs) in UHPC production [ 7 ]. Traditional SCMs have a pozzolanic potential [ 8 ], micro-filler effect [ 9 ], and nucleation effect [ 10 ], contribute to the strength formation, while the ordinary early-age strength, energy consumption, and high-cost [ 3 , 11 ], hindering their applications in some fields [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder

Zhong

Yan

et al. 2021

Materials

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It has been reported that iron tailing powder (ITP) has the potential to partially replace cement to prepare ultra-high-performance concrete (UHPC). However, the reactivity of ITP particles in concrete largely depends on the curing method. This study investigates the effects of curing conditions on the mechanical and microstructural properties of UHPC containing ITP. To achieve this objective, three research tasks are conducted, including (1) preparing seven concrete formulations by introducing ITP; (2) characterizing their mechanical performance under different curing regimes; and (3) analyzing their microstructure by XRD patterns, FTIR analysis, and SEM observation. The experimental results show that there is an optimum ITP dosage (15%) for their application. The concrete with 15% ITP under standard curing obtains 94.3 MPa at 7 days, their early-age strength could be even further increased by ~30% (warm-water curing) and ~35% (steamed curing). The steam curing regime stimulates the activity of ITP and refines the microstructure. This study demonstrates the potential of replacing Portland cement with ITP in UHPC production.

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Recovery of iron from hazardous tailings using fluidized roasting coupling technology

Cited by 41 publications

References 37 publications

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

Iron recovery from zinc mine tailings by magnetic separation followed by carbothermal reduction of self‐reducing briquettes

Preparation of Micro-Iron Ore Tailings by Wet-Grinding and Its Application in Sulphoaluminate Cement

Effects of Curing Conditions on the MECHANICAL and Microstructural Properties of Ultra-High-Performance Concrete (UHPC) Incorporating Iron Tailing Powder

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