Recovery of ferric oxide from bayer red mud by reduction roasting-magnetic separation process

Liu, Yanjie; Zuo, Kesheng; Yang, Guang; Shang, Zhe

doi:10.1007/s11595-016-1383-y

Cited by 17 publications

(7 citation statements)

References 9 publications

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“…Besides, the iron grade of iron concentrate reached up to maximum of 65.83 % at 600 Gs, which has been up to the standard of smelting (>56 %) [75] . Moreover, the reduction of iron species in Red Mud with bio‐oil as reductant has the advantages of low reaction temperature [77] and high reduction efficiency [78] . In addition, the main impurity in the iron concentrate after magnetic separation was carbon powder, which was just used as the reductant for the next steelmaking.…”

Section: Resultsmentioning

confidence: 99%

Upgrading Fast Pyrolysis Oil through Decarboxylation by Using Red Mud as Neutralizing Agent for Ketones Production and Iron Recovery

et al. 2022

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In this work, Red Mud, an alkaline solid waste from alumina production, was used as neutralizing agent to convert carboxylic acids in bio‐oil into ketones. The total acidity of the bio‐oil decreased significantly from 152.60 to 0.63 mg KOH/g, while the high heat value boosted from 17.25 to 29.57 MJ/kg. Meanwhile, the leachable alkalinity of Red Mud declined from 65.34 to 3.02 mg HCl/g, mitigating the harmfulness and perniciousness to the environment. Furthermore, characterizations of XRD, XPS and 57Fe Mössbauer spectroscopy indicated that the weak magnetic iron species in Red Mud was completely transformed into stronger magnetic Fe3O4. With magnetic separation the iron recovery reached up to 91.96 % with iron grade of 65.83 %, which is up to the standard of steelmaking raw material. The findings in this research not only open avenue for valorization of bio‐oil but also help explore the resourceful utilization of Red Mud.

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Section: Resultsmentioning

confidence: 99%

Upgrading Fast Pyrolysis Oil through Decarboxylation by Using Red Mud as Neutralizing Agent for Ketones Production and Iron Recovery

et al. 2022

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“…Bayer red mud with 19.6% iron content was mixed with 50% carbon powder and 4% additive and then roasted at 700℃ for 20 min. The roasted products were ground and magnetically separated to obtain a magnetite concentrate with 60% total iron and an iron recovery of 91% (Liu et al 2016). In the study of Lu, the waste cathode carbon block was used as the reducing agent to reduce the high-iron red mud to obtain the iron concentrate powder by magnetic separation.…”

Section: Liu Et Al (2008) Usedmentioning

confidence: 99%

Summary of research progress on separation and extraction of valuable metals from Bayer red mud

Wang

Zhang²,

Liu³

et al. 2022

Environ Sci Pollut Res

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Bayer red mud is a strong alkaline solid waste discharged during alumina production. Due to large emissions and strong alkalinity, red mud is now mostly dammed or buried, which not only occupies huge land but also contaminates the surrounding ecosystem, causing the risk of collapse and landslide. In addition to its overall utilization in building materials, agriculture, the environment, and the chemical industry, red mud also contains valuable metals such as sodium, aluminum, iron, titanium, and scandium and is considered to be an important secondary resource. In this paper, the physicochemical properties and hazards of red mud are rst introduced, and then the overall utilization of red mud is summarized. Then, the latest research progress on the separation and extraction of valuable metals from red mud is reviewed in detail, and a new comprehensive utilization method is proposed and analyzed. This paper also provides suggestions for the future development direction of the comprehensive utilization technology of red mud.

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“…In view of the potential hydration properties of red mud during sintering and combination, it can be used in the production of cement, bricks for building, glass, and special ceramics, as well as in additives or auxiliary materials for asphalt materials, roadbed materials, thermal insulation materials, and other building materials [11][12][13][14]. BRM with a large specific surface area shows excellent adsorption capacity for metal ions and radioactive elements, which can be used as an adsorbent for environmental restoration, such as waste gas treatment, wastewater treatment, and soil remediation [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Environmental Safety Analysis of Red Mud-Based Cemented Backfill on Groundwater

Zhang

Feng

et al. 2021

IJERPH

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As one of the main industrial solid wastes, there are a large number of free alkaloids, chemically bound alkaloids, fluoride, and heavy metal ions in Bayer process red mud (BRM), which are difficult to remove and easily pollute groundwater as a result of open storage. In order to realize the large-scale industrial application of BRM as a backfilling aggregate for underground mining and simultaneously avoid polluting groundwater, the material characteristics of BRM were analyzed through physical, mechanical, and chemical composition tests. The optimum cement–sand ratio and solid mass concentration of the backfilling were obtained based on several mixture proportion tests. According to the results of bleeding, soaking, and toxic leaching experiments, the fuzzy comprehensive evaluation method was used to evaluate the environmental impact of BRM on groundwater. The results show that chemically bound alkaloids that remained in BRM reacted with Ca2+ in PO 42.5 cement, slowed down the solidification speed, and reduced the early strength of red mud-based cemented backfill (RMCB). The hydration products in RMCB, such as AFT and C-S-H gel, had significant encapsulation, solidification, and precipitation inhibition effects on contaminants, which could reduce the contents of inorganic contaminants in soaking water by 26.8% to 93.8% and the leaching of toxic heavy metal ions by 57.1% to 73.3%. As shown by the results of the fuzzy comprehensive evaluation, the degree of pollution of the RMCB in bleeding water belonged to a medium grade Ⅲ, while that in the soaking water belonged to a low grade II. The bleeding water was diluted by 50–100 times to reach grade I after flowing into the water sump and could be totally recycled for drilling and backfilling, thus causing negligible effects on the groundwater environment.

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Recovery of ferric oxide from bayer red mud by reduction roasting-magnetic separation process

Cited by 17 publications

References 9 publications

Upgrading Fast Pyrolysis Oil through Decarboxylation by Using Red Mud as Neutralizing Agent for Ketones Production and Iron Recovery

Upgrading Fast Pyrolysis Oil through Decarboxylation by Using Red Mud as Neutralizing Agent for Ketones Production and Iron Recovery

Summary of research progress on separation and extraction of valuable metals from Bayer red mud

Environmental Safety Analysis of Red Mud-Based Cemented Backfill on Groundwater

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