A novel approach is proposed, combining pyrometallurgical and hydrometallurgical processes, to enhance the recovery of Fe and Al while effectively breaking down the mineral composition of red mud. The study delves into the roasting reduction behavior and conversion mechanism of red mud, utilizing thermodynamic analysis and conducting roasting experiments. Extensive investigations were conducted to analyze the impact of roasting temperature and time on the carbothermal reduction of red mud. The results indicate that the most favorable leaching effect of iron and aluminum from red mud was achieved at 1000 °C for 45 min. Furthermore, the behavior of roasted red mud during acid leaching was meticulously explored. During the roasting process, the vast majority of hematite in the red mud underwent reduction to FeO and Fe, while the aluminum-bearing minerals melted and decomposed to form NaAlSiO4 and Ca2Al2SiO7, along with other substances. The formation of low-valent and independently present iron products played a crucial role in achieving high Fe leaching rates. However, the presence of Ca2Al2SiO7 in the roasting product proved difficult to leach with acid and remained encapsulated by the acid-leaching product, leading to poor Al leaching efficiency. The acid leaching process exhibited promising results, with maximum leaching rates of iron and aluminum reaching 95.73% and 72.54%, respectively. This success can be attributed to the control over experimental conditions, which allowed for the generation of desired iron oxides with various valence states.
Journal Article A case of primary cutaneous diffuse large B‐cell lymphoma, leg type monitored with fluorine‐18‐fluorodeoxyglucose positron emission tomography/computed tomography Get access M. Liu, M. Liu Departments of Dermatology Search for other works by this author on: Oxford Academic Google Scholar S.J. Shan, S.J. Shan Departments of Dermatology Search for other works by this author on: Oxford Academic Google Scholar T. Xiao, T. Xiao Departments of Dermatology Search for other works by this author on: Oxford Academic Google Scholar Y.F. Yin, Y.F. Yin Nuclear Medicine, No. 1 Hospital of China Medical University; Key Laboratory of Immunodermatology, Ministry of Health (China Medical University), Shenyang, Liaoning 110001, China Search for other works by this author on: Oxford Academic Google Scholar J. Wu, J. Wu Departments of Dermatology Search for other works by this author on: Oxford Academic Google Scholar H.C. Wei, H.C. Wei Department of Dermatology, Mount Sinai Medical Center, New York, NY 10029, U.S.A. Search for other works by this author on: Oxford Academic Google Scholar H.D. Chen, H.D. Chen Departments of Dermatology Search for other works by this author on: Oxford Academic Google Scholar C.D. He C.D. He Departments of Dermatology Correspondence: C.D. He. E‐mail: chundihe@hotmail.com Search for other works by this author on: Oxford Academic Google Scholar British Journal of Dermatology, Volume 160, Issue 3, 1 March 2009, Pages 713–716, https://doi.org/10.1111/j.1365-2133.2008.08997.x Published: 01 March 2009
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