Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal
Red mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the p...
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MDPI AG
2021-03-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/3/469 |
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| author | Dmitry Zinoveev Pavel Grudinsky Ekaterina Zhiltsova Darya Grigoreva Anton Volkov Valery Dyubanov Alexander Petelin |
| author_facet | Dmitry Zinoveev Pavel Grudinsky Ekaterina Zhiltsova Darya Grigoreva Anton Volkov Valery Dyubanov Alexander Petelin |
| author_sort | Dmitry Zinoveev |
| collection | DOAJ |
| description | Red mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the process of hydrochloric high-pressure acid leaching using 10 to 20% HCl of two samples of non-magnetic tailings obtained by 60 min carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt.% of red mud and 15.4 wt.% Na<sub>2</sub>SO<sub>4</sub> at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. The influence of temperature, leaching duration, solid-to-liquid-ratio and acid concentration on the dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr was studied. Based on the investigation of the obtained residues, a mechanism for passing valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed. |
| first_indexed | 2024-03-10T13:17:17Z |
| format | Article |
| id | doaj.art-4c46413843804c1bb77f153035042e57 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T13:17:17Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-4c46413843804c1bb77f153035042e572023-11-21T10:16:14ZengMDPI AGMetals2075-47012021-03-0111346910.3390/met11030469Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron RemovalDmitry Zinoveev0Pavel Grudinsky1Ekaterina Zhiltsova2Darya Grigoreva3Anton Volkov4Valery Dyubanov5Alexander Petelin6Laboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, RussiaLaboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, RussiaLaboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, RussiaLaboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, RussiaLaboratory of Complex Chemical Research, N.P. Lyakishev Scientific Center for Complex Processing of Raw Materials, I. P. Bardin Central Research Institute of Ferrous Metallurgy, 23/9 bdg. 2, Radio Str., 105005 Moscow, RussiaLaboratory of Physical Chemistry and Technology of Iron Ore Processing, A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Science, 49 Leninsky Prosp., 119334 Moscow, RussiaDepartment of Energy-Efficient and Resource-Saving Industrial Technologies, National University of Science & Technology (MISIS), 4 Leninsky Prosp., 119049 Moscow, RussiaRed mud is a hazardous waste of the alumina industry that contains high amounts of iron, aluminum, titanium and rare-earth elements (REEs). One of the promising methods for the extraction of iron from red mud is carbothermic reduction with the addition of sodium salts. This research focuses on the process of hydrochloric high-pressure acid leaching using 10 to 20% HCl of two samples of non-magnetic tailings obtained by 60 min carbothermic roasting of red mud at 1300 °C and the mixture of 84.6 wt.% of red mud and 15.4 wt.% Na<sub>2</sub>SO<sub>4</sub> at 1150 °C, respectively, with subsequent magnetic separation of metallic iron. The influence of temperature, leaching duration, solid-to-liquid-ratio and acid concentration on the dissolution behavior of Al, Ti, Mg, Ca, Si, Fe, Na, La, Ce, Pr, Nd, Sc, Zr was studied. Based on the investigation of the obtained residues, a mechanism for passing valuable elements into the solution was proposed. It has shown that 90% Al, 91% Sc and above 80% of other REEs can be dissolved under optimal conditions; Ti can be extracted into the solution or the residue depending on the leaching temperature and acid concentration. Based on the research results, novel flowsheets for red mud treatment were developed.https://www.mdpi.com/2075-4701/11/3/469red mudbauxite residuereduction roastingsodium sulfatemagnetic separationalumina |
| spellingShingle | Dmitry Zinoveev Pavel Grudinsky Ekaterina Zhiltsova Darya Grigoreva Anton Volkov Valery Dyubanov Alexander Petelin Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal Metals red mud bauxite residue reduction roasting sodium sulfate magnetic separation alumina |
| title | Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal |
| title_full | Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal |
| title_fullStr | Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal |
| title_full_unstemmed | Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal |
| title_short | Research on High-Pressure Hydrochloric Acid Leaching of Scandium, Aluminum and Other Valuable Components from the Non-Magnetic Tailings Obtained from Red Mud after Iron Removal |
| title_sort | research on high pressure hydrochloric acid leaching of scandium aluminum and other valuable components from the non magnetic tailings obtained from red mud after iron removal |
| topic | red mud bauxite residue reduction roasting sodium sulfate magnetic separation alumina |
| url | https://www.mdpi.com/2075-4701/11/3/469 |
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