An Efficient Process to Recover Iron from Bayer Red Mud

Xiao, Junhui; Zhong, Nanlan; Gao, Deqiang; Zou, Kai; Wang, Zhen; Huang, Wenxiao; Xiong, Wenliang

doi:10.1007/s11837-022-05373-2

Cited by 9 publications

(1 citation statement)

References 35 publications

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“…Hydroxamic acid collectors have the dual properties of "amide" and "oxime", have strong coordination with metal ions on the surfaces of minerals through hydroxyl and N-bonded oxygen atoms and strongly form chelates with highly charged rare earth element cations but weakly form chelates with alkaline earth metal ions, such as Ca 2+ and Mg 2+ [24,25]. Therefore, they have been more studied and more widely used as selective collectors for rare earth minerals [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite

Xiong

Wang²,

Xiao³

et al. 2022

Minerals

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In this study, 2-hydroxy-3-naphthalene hydroxamic acid (NHA) was used as a collector in microflotation experiments. By comparing the flotation performance of NHA with that of sodium oleate (NaOL) and salicylhydroxamic acid (SHA) commonly used in industry, the performance of NHA in the flotation separation of bastnaesite and calcite was studied. Potentiodynamic (zeta) measurements, Fourier transform infrared spectroscopy (FTIR) measurements and X-ray photoelectron spectroscopy (XPS) measurements were used to reveal the interaction mechanism of bastnaesite with NHA. The results of the pure mineral microflotation test showed that when the pH value was 9 and the dosage of NHA was 4.0 × 10−4 mol/L, the recovery of bastnaesite reached 93.5%. A concentrate with a bastnaesite grade of 87.08% was obtained from the flotation test of artificially mixed ore, and the recovery of bastnaesite was 90.83%. The zeta measurements and FTIR experiments showed that NHA adsorbed onto the surface of bastnaesite, which changed the surface state of bastnaesite. XPS testing showed that NHA chemically adsorbed onto the bastnaesite, and Ce3+ formed a chelated structure with −C(OH)=NO−. The hydrophobicity of the surface of bastnaesite was improved, which made it easier for bastnaesite to adhere to the slurry surface by bubbles. At present, most of the domestic methods for recovering fine-grained bastnaesite use flotation recovery. Calcite and other gangue minerals inevitably enter into the concentrate resulting in low-grade REE concentrate.

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Section: Introductionmentioning

confidence: 99%

Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite

Xiong

Wang²,

Xiao³

et al. 2022

Minerals

Self Cite

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Applicability of Waste from Al Industry toward Dephosphorization of Hot Metal in Primary Steel Making

Padala,

Das,

Pal

et al. 2024

steel research int.

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Managing industrial waste is a global challenge. Red mud is a byproduct of the aluminum industry posing serious concerns. The presence of FeO and CaO in red mud makes it a potential DeP flux. Red mud has been utilized as a DeP flux in previous studies, but these studies deal with low Si content and no P2O5 content in the red mud. However, certain steel makers have high initial Si content (0.6–0.7 wt%) in the hot metal, and with increasing demand for low P steel, new dephosphorization fluxes need to be explored. Addressing this gap, this study investigates red mud's potential as a flux for dephosphorization in hot metal with elevated Si levels. Conducting slag–metal equilibrium experiments at 1350 °C, using red mud‐based fluxes, the research achieves a 40% dephosphorization degree under optimized conditions of double deslagging and fluxing. Analysis via wet chemical methods and inductively coupled plasma mass spectrometry confirms the effectiveness of the approach. Furthermore, thermodynamic calculations highlight the influence of O2 partial pressure and Si content on dephosphorization efficacy. Through laboratory experiments and theoretical insights, this study provides a valuable roadmap for leveraging red mud as a sustainable flux in hot metal dephosphorization processes, contributing to both waste management and steel production efficiency.

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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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An Efficient Process to Recover Iron from Bayer Red Mud

Cited by 9 publications

References 35 publications

Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite

Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite

Applicability of Waste from Al Industry toward Dephosphorization of Hot Metal in Primary Steel Making

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

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