Integrated Pyrolysis–Tar Decomposition over Low-Grade Iron Ore for Ironmaking Applications: Effects of Coal–Biomass Fuel Blending

Kurniawan, Ade; Abé, Keisuke; Nomura, Takahiro; Akiyama, Tomohiro

doi:10.1021/acs.energyfuels.6b02509

Cited by 16 publications

(7 citation statements)

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“…[26][27][28] It can also improve catalytic activities of the ore for some fuel decompositions. [29][30][31] In particular, goethite ore has a catalytic activity for ammonia decomposition (e.g., NH 3 → 1.5H 2 + 0.5N 2 ). [32][33][34] The utilization of ammonia as a reducing agent in ironmaking has been studied under reducing hematite reagent by ammonia, reporting the effect of ammonia concentration in reducing gas and showing that the hydrogen flowrate limits the iron reduction degree.…”

Section: Reduction Behaviors and Generated Phases Of Iron Ores Using ...mentioning

confidence: 99%

Reduction Behaviors and Generated Phases of Iron Ores using Ammonia as Reducing Agent

et al. 2022

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Section: Reduction Behaviors and Generated Phases Of Iron Ores Using ...mentioning

confidence: 99%

Reduction Behaviors and Generated Phases of Iron Ores using Ammonia as Reducing Agent

et al. 2022

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“…This reduced iron can be used as a high-quality raw material for ironmaking. Kurniawan et al 14 studied the effect of combined coal–biomass with various biomass blending ratios (BBRs) on coal–biomass-integrated copyrolysis–tar decomposition over a low-grade iron ore, and the highest carbon content of a porous iron ore (4.70%) was obtained when BBR-25% was used. These studies show that in the temperature range of 600–700 °C, the reductive volatilization produced by biomass pyrolysis can effectively reduce Fe 2 O 3 to Fe 3 O 4 .…”

Section: Introductionmentioning

confidence: 99%

Reduction–Magnetic Separation of Pickling Sludge by Biomass Pyrolysis Reducing Gas

Shu

Wang

et al. 2022

ACS Omega

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The neutralization process of carbon steel pickling wastewater produces a large amount of steel hydrochloric acid pickling sludge (SHPS), and improper treatment of this sludge poses a serious threat to the environment. Considering that SHPS contains a large amount of iron oxide and given the huge demand for iron concentrate in China’s ironmaking industry, refining iron oxide in SHPS into iron concentrate will have great environmental and economic benefits. This paper proposes a new method that uses biomass (corncob) to replace conventional coal-based reductants for the recovery of iron components in SHPS to simultaneously utilize two kinds of solid waste resources. Factors that affect the iron recovery rate and iron grade of SHPS, such as the reaction temperature, corncob dosage, residence time, and magnetic field strength, were studied using a fixed bed and a magnetic separator. These studies were combined with thermodynamic analysis, thermogravimetric analysis, X-ray diffraction, inductively coupled plasma–mass spectrometry, gas chromatography, etc. The results showed that when the reaction temperature was 680 °C, the corncob dosage was 5%, the residence time was 20 min, and the magnetic field strength was 200 mT, the recovery rate of iron reached 91.83%, and the iron grade of the recovered products was 67.72%, meeting the level I requirements in GB/T 32545-2016. Based on this result, a process involving SHPS reduction roasting with corncob pyrolysis reducing gas–magnetic separation was established to recover iron from SHPS. This process not only effectively utilizes the iron oxide in SHPS by converting it into iron concentrate powder for the ironmaking industry but also proves that the pyrolysis gas of corncob has good reduction ability.

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“…The surface area of iron oxide is the main factor during catalytic decomposition of biomass tar from the pyrolysis process. Natural iron ore, such as goethite ore, is also suitable for biomass tar decomposition and producing a valuable gas product during pyrolysis. , …”

Section: Introductionmentioning

confidence: 99%

“…Natural iron ore, such as goethite ore, is also suitable for biomass tar decomposition and producing a valuable gas product during pyrolysis. 15,16 In our previous reports, 17,18 the decomposition of tar material was performed over an integrated pyrolysis−tar decomposition process, in which the volatile matter including the tar component from biomass pyrolysis was introduced to the fixed bed of porous iron ore for the tar decomposition process. Tar decomposition results huge valuable gas products (CO and H 2 ), while carbon deposits within the porous ore simultaneously and initiates the catalyst deactivation.…”

Section: Introductionmentioning

confidence: 99%

Steam Reforming of Tar Using Low-Grade Iron Ore for Hydrogen Production

et al. 2019

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In the gasification process, tar material may cause operational problems, such as carbon deposition over a catalyst, pipe plugging, condensation, and tar aerosol formation. Unusual approaches should be introduced to solve carbon deposition over a catalyst, which was a serious problem in the tar decomposition process. The utilization of low-grade iron ore as a catalyst and effect of adding steam in the tar-reforming process were evaluated through this study. As a result of insufficient energy to remove the OH group at the dehydration below 200 °C, the generation of pores within iron ore was still incomplete. On the other hand, the generation of pores increased rapidly between 200 and 300 °C, which was indicated by increasing the Brunauer–Emmett–Teller surface area. The phase of iron ore was changed along the process and may increase the catalyst activity during the reforming process. The utilization of low-grade iron ore in the steam reforming of tar significantly increased the total gas production, especially H2 and CO2. This was due to the porous iron ore being able to provide a high surface area for the tar decomposition reaction. The addition of steam to the tar decomposition reaction increased the gas product and decreased the carbon formation. The excessive increase of gas production occurred at the decomposition of 800 °C, such as H2, CO, and CH4. Therefore, steam reforming using low-grade iron ore was a promising candidate to solve the tar material problem.

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Integrated Pyrolysis–Tar Decomposition over Low-Grade Iron Ore for Ironmaking Applications: Effects of Coal–Biomass Fuel Blending

Cited by 16 publications

References 43 publications

Reduction Behaviors and Generated Phases of Iron Ores using Ammonia as Reducing Agent

Reduction Behaviors and Generated Phases of Iron Ores using Ammonia as Reducing Agent

Reduction–Magnetic Separation of Pickling Sludge by Biomass Pyrolysis Reducing Gas

Steam Reforming of Tar Using Low-Grade Iron Ore for Hydrogen Production

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