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ArticleName Thermochemical processing of bauxites of the North Onega region
DOI 10.17580/or.2021.03.03
ArticleAuthor Dubovikov О. A., Sundurov A. V., Ustinov I. D.

St. Petersburg Mining University (St. Petersburg, Russia):
Dubovikov O. A., Professor, Doctor of Engineering Sciences,
Sundurov A. V., Postgraduate Student,


REC «Mekhanobr-Tekhnika» (St. Petersburg, Russia):
Ustinov I. D., Head of the Scientific and Educational Center, Doctor of Chemical Sciences,


Thermochemical processing of low-grade bauxites allows obtaining suitable bauxite concentrates for the Bayer process, which in turn leads to reduced sintering volumes. The article presents the results of an experimental study of the influence of various calcining temperatures on the subsequent output of bauxite concentrate from bauxites of the North Onega region. The influence of the dosage of calcium oxide in the range of 0 to 30 % at the leaching stage on the aluminum oxide recovery and the alkali content in the red mud is shown. Results are presented for the hydro-garnet red mud processing using alkaline solutions for the purpose of additional recovery of alumina. It has been identified that calcining at 1000 °C allows activating the initial bauxite and achieving streamlined desiliconization times with subsequent filtration of the liquid and solid phases. As compared with lower (975 °C) and higher (1100 °C) temperatures, the time required for the maximum recovery of silicon dioxide into the alkaline solution increases, extending the time interval for the separation of liquid and solid phases and minimizing the secondary processes. It has been shown that addition of calcium oxide at the leaching stage causes a sharp decrease in the alkali content in the red mud at the dosage of 13.13 %, while the recovery of alumina from the concentrate decreases only slightly. Red mud treatment with alkaline solutions ensures additional recovery of aluminum oxide, with the recovery values reaching 30% for the sludge and 6.5 % for the concentrate.
The work was carried out with the financial support of the Russian Science Foundation, project No. 18-17-00169.

keywords Bauxite, red mud, limestone, calcium oxide, thermochemical processing, Bayer process, calcining, leaching

1. Dubovikov O. A., Sizyakov V. M. Efficient technologies for processing low-quality bauxite. St. Petersburg: NMSU «Gornyi», 2012. 195 p.
2. Loginova I. V., Kyrchikov A.V., Penyugalova N. P. Technology of alumina production. Ekaterinburg: UrFU, 2015. 336 p.
3. Brichkin V. N., Kurtenkov R. V., Eldib A. B., Bormotov I. S. State and development options for the raw material base of aluminum in non-bauxite regions. Obogashchenie Rud. 2019. No. 4. pp. 31–37. DOI: 10.17580/or.2019.04.06.
4. Gerasimov A. M., Lazareva V. V., Arsentyev V. A. Effects of microwave heating on the behavior of layered aluminosilicates. Obogashchenie Rud. 2019. No. 6. pp. 15–19. DOI: 10.17580/or.2019.06.03.
5. Al-Ajeel A. A., Abdullah S. Z., Muslim W. A., Abdulkhader M. Q., Al-Halbosy M. K., Al-Jumely F. A. Extraction
of alumina from Iraqi colored kaolin by lime-sinter process. Iraqi Bulletin of Geology and Mining. 2014. Vol. 10, No. 3. pp. 109–117.
6. Fei L., Yuehua H., Li W., Wei S. Dealkalization processes of bauxite residue: A comprehensive review. Journal of Hazardous Materials. 2021. Vol. 403. DOI: 10.1016/j.jhazmat.2020.123671.
7. Li-Qun X., Ting-An Z., Guo-Zhi L., Xiao-Feng Z. Direct calcification–carbonation method for processing of Bayer process red mud. Russian Journal of Non-Ferrous Metals. 2018. Vol. 59. pp. 142–147.
8. Ruibing L., Xiaolong L., Dongxing W., Yan L., Ting’an Z. Calcification reaction of red mud slurry with lime. Powder Technology. 2018. Vol. 333. pp. 277–285.
9. Zhang T., Wang Y., Lu G., Liu Y., Zhang W., Zhao Q. Comprehensive utilization of red mud: current research status and a possible way forward for non-hazardous treatment. Light Metals. Springer, 2018. pp. 135–141.
10. Zhu X., Zhang T., Wang Y., Weiguang Z. Recovery of alkali and alumina from Bayer red mud by the calcification–carbonation method. International Journal of Minerals, Metallurgy and Materials. 2016. Vol. 23. pp. 257–268.
11. Taylor H. F. W. Cement chemestry. London: Thomas Telford, 1997. 361 p.
12. Salamatov V. I., Salamatov O. V., Dudarev V. I. On the use of lime milk (CaO) in the processes of dehydration and washing of red sludge from low-siliceous bauxite. Vestnik Irkutskogo Gosudarstvennogo Tekhnicheskogo Universiteta. 2017. Vol. 21, No. 2. pp. 146–154.
13. Sizyakov V. M., Tikhonova E. V. Physical and chemical transformations of calcium in aluminate solutions of alumina production. Zhurnal Prikladnoy Khimii. 2012. Vol. 85, Iss. 11. pp. 1746–1750.
14. Birinci M., Gok R. Characterization and flotation of low-grade boehmitic bauxite ore from Seydisehir. Minerals Engineering. 2021. Vol. 161. 10 p. DOI: 10.1016/j.mineng.2020.106714.
15. Wang Y., Zhang T., Lv G., Liu Y., Zhang W., Zhao Q. Overview of process control of novel calcification carbonation process for bauxite residue treatment. Hydrometallurgy. 2021. Vol. 199. DOI: 10.1016/j.hydromet.2020.105536.
16. Abdulvaliev R. A., Gladyshev S. V., Kenzhaliev B. K., Imangalieva L. A. Complex processing of the iron-bearing fraction of bauxites with the manufacture of bloomery iron. Obogashchenie Rud. 2020. No. 2. pp. 41–45. DOI: 10.17580/or.2020.02.07.

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