Characteristics of Fe powders prepared by spray pyrolysis from various types of Fe precursors as a heat pellet material

Koo, Hye Young; Kim, J. H.; Hong, Seung Sae; Han, Jin Man; Ko, You Na; Kang, Shin-Hyung; Cho, S. B.

doi:10.1007/s12540-010-1212-3

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…This approach is very promising in relation to coal fly ash, since the main alumina mineral, mullite, has low solubility in HCl, and losses of aluminum in this process will be minimum [30]. An aqueous solution of FeCl 3 can be recycled by spray pyrolysis at 600 • C. Spheres of α-Fe 2 O 3 received by this method, can be used as pigments [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Valeev

Михайлова

Atmadzhidi

2018

Metals

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Iron contained in coal fly ash of the Ekibastuz power station is distributed between magnetite and hematite. XRD data showed that~80 wt % of iron is contained in magnetite and 20 wt % in hematite. The leaching of iron from CFA by HCl was studied. It was determined that leaching efficiency increased with the increase in hydrochloric acid concentration and temperature. The maximum iron extraction efficiency was 52%. Aluminum is contained in the mullite and was practically not leached. The maximum aluminum extraction efficiency was 3.7%. The kinetics investigation showed that the process of iron leaching was controlled by chemical reaction and diffusion process steps, with an activation energy of 33.25 kJ•mol −1. The aluminum leaching process is controlled by a diffusion process step with an activation energy of 19.89 kJ•mol −1. The reaction order of hydrochloric acid is determined to be 0.9 and 0.23 for iron and aluminum, respectively.

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Section: Introductionmentioning

confidence: 99%

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Valeev

Михайлова

Atmadzhidi

2018

Metals

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“…The above-mentioned metal oxalates are produced via several synthetic methods such as spray pyrolysis, solvothermal reaction, sol–gel methods, , hydrothermal reaction, and microwave-assisted solution approaches . Nacimiento et al employed polyacrylonitrile (PAN) to improve the dispersion of SnC 2 O 4 particles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Electrochemical Reaction of Tin Oxalate-Reduced Graphene Oxide Composite Anode for Rechargeable Lithium Batteries

Park

Yashiro

et al. 2017

ACS Appl. Mater. Interfaces

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Unlike for SnO, few studies have reported on the use of SnCO as an anode material for rechargeable lithium batteries. Here, we first introduce a SnCO-reduced graphene oxide composite produced via hydrothermal reactions followed by a layer-by-layer self-assembly process. The addition of rGO increased the electric conductivity up to ∼10 S cm. As a result, the SnCO-reduced graphene oxide electrode exhibited a high charge (oxidation) capacity of ∼1166 mAh g at a current of 100 mA g (0.1 C-rate) with a good retention delivering approximately 620 mAh g at the 200th cycle. Even at a rate of 10 C (10 A g), the composite electrode was able to obtain a charge capacity of 467 mAh g. In contrast, the bare SnCO had inferior electrochemical properties relative to those of the SnCO-reduced graphene oxide composite: ∼643 mAh g at the first charge, retaining 192 mAh g at the 200th cycle and 289 mAh g at 10 C. This improvement in electrochemical properties is most likely due to the improvement in electric conductivity, which enables facile electron transfer via simultaneous conversion above 0.75 V and de/alloy reactions below 0.75 V: SnCO + 2Li + 2e → Sn + LiCO + xLi + xe → LiSn on discharge (reduction) and vice versa on charge. This was confirmed by systematic studies of ex situ X-ray diffraction, transmission electron microscopy, and time-of-flight secondary-ion mass spectroscopy.

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“…Metal oxalates can be produced via solid-state reactions, 30 spray pyrolysis, 31 reverse-micellar route methods, 32 solvothermal reactions, 33 sol-gel methods, 34,35 hydrothermal methods 36 and microwave-assisted solution approaches. 37 In this work, we successfully synthesized NiC 2 O 4 ·2H 2 O nanorods via a facile hydrothermal method.…”

Section: Introductionmentioning

confidence: 99%

Nickel oxalate dihydrate nanorods attached to reduced graphene oxide sheets as a high-capacity anode for rechargeable lithium batteries

Yoon

et al. 2016

NPG Asia Mater

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In the search for high-capacity anode materials, a facile hydrothermal route has been developed to synthesize phase-pure NiC 2 O 4 ·2H 2 O nanorods, which were crystallized into the orthorhombic structure without using templates. To ensure the electrical conductivity of the nanorods, the produced NiC 2 O 4 ·2H 2 O nanorods were attached to reduced graphene oxide (rGO) sheets via self-assembly layer-by-layer processes that utilize the electrostatic adsorption that occurs in a poly(diallyldimethylammonium chloride) solution. The high electrical conductivity aided by the presence of rGO significantly improved the electrochemical properties: 933 mAh g − 1 for the charge capacity (oxidation), which showed 87.5% efficiency at the first cycle with a retention of approximately 85% for 100 cycles, and 586 mAh g − 1 at 10 C-rates (10 A g − 1 ) for the NiC 2 O 4 ·2H 2 O/rGO electrode. The lithium storage processes were involved in the conversion reaction, which were fairly reversible via a transformation to Ni metal accompanied by the formation of a lithium oxalate compound upon discharge (reduction) and restoration to the original NiC 2 O 4 ·2H 2 O upon charging (oxidation); this was confirmed via X-ray diffraction, transmission electron microscopy, X-ray photoelectron microscopy and time-of-flight secondary ion mass spectroscopy. We believe that the high rate capacity and rechargeability upon cycling are the result of the unique features of the highly crystalline NiC 2 O 4 ·2H 2 O nanorods assisted by conducting rGOs. INTRODUCTIONThe demand for sustainable and green-energy sources is rising because of increasing concerns regarding fast population growth and industrialization worldwide. Lithium-ion batteries have been developed as power sources over several decades and have achieved great commercial success, ranging from mobile to stationary applications. [1][2][3][4] Rechargeable lithium-ion batteries are suitable for the aforementioned applications because of their high energy density and high power properties. 5,6 In commercial batteries, graphite is commonly adopted as the active material for the negative electrodes. Apart from its ability to accommodate Li + ions in its structure and its reversibility, the theoretical capacity of graphite is limited to 372 mAh g − 1 . 7 The predominant intercalation potential of graphite is approximately 0.1 V vs Li/Li + , which results in risks associated with short circuits derived from dendritic growth of Li. In the past, efforts have been made to find high-capacity alternative electrode materials to replace graphite. These new materials can be classified based on their reaction mechanisms: (i) intercalation: Ti-based oxides that store

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Characteristics of Fe powders prepared by spray pyrolysis from various types of Fe precursors as a heat pellet material

Cited by 7 publications

References 7 publications

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Kinetics of Iron Extraction from Coal Fly Ash by Hydrochloric Acid Leaching

Synthesis and Electrochemical Reaction of Tin Oxalate-Reduced Graphene Oxide Composite Anode for Rechargeable Lithium Batteries

Nickel oxalate dihydrate nanorods attached to reduced graphene oxide sheets as a high-capacity anode for rechargeable lithium batteries

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