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Leaching Behavior and Kinetics of Scandium and Yttrium from Bayer Red Mud
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Kui HUANG1, 2, Yan DING1, Qiheng TANG1, Rugui LI1, Xinke SHAN1, Yuanhuan LU1, Siyan LU1
Mining and Metallurgical Engineering | 2024, 44(3) : 111 - 115
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Mining and Metallurgical Engineering | 2024, 44(3): 111-115
• METALLURGY •
Leaching Behavior and Kinetics of Scandium and Yttrium from Bayer Red Mud
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Kui HUANG1, 2, Yan DING1, Qiheng TANG1, Rugui LI1, Xinke SHAN1, Yuanhuan LU1, Siyan LU1
Affiliations
  • 1.School of Resources, Environment and Materials, Guangxi University, Nanning 530004, Guangxi, China
  • 2.Key Laboratory of Environmental Protection (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, Guangxi, China
Published: 2024-06-01 doi: 10.3969/j.issn.0253-6099.2024.03.024
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A two-step acid leaching process was used to leach scandium and yttrium from red mud. Phosphoric acid was used in the first stage of leaching to achieve dealkalization, desilication and enrichment of rare earth elements (scandium and yttrium). Then, the leaching residue was leached with sulfuric acid in the second stage. The effects of sulfuric acid concentration, liquid-solid ratio, reaction temperature and reaction time on the leaching process of scandium and yttrium were investigated, and the leaching kinetics was also analyzed. It is found that leaching of red mud with phosphoric acid can bring better dealkalization and desilication effect, showing the leaching rates of K, Na and Si at 75.62%, 87.82% and 80.25%, respectively. Then, in the second stage of leaching process with sulfuric acid concentration of 2.5 mol/L and liquid-solid ratio of 7∶1, reaction runs at 70 ℃ for 45 min, leading to the average leaching rates of Sc and Y up to 74.49% and 80.02%, respectively. It is shown that the leaching processes of Sc and Y with sulfuric acid follow the liquid-solid reaction model, which is controlled by diffusion, and the apparent reaction activation energies are calculated to be 18.50 kJ/mol and 16.74 kJ/mol, respectively.

Bayer red mud  /  acid leaching  /  scandium  /  yttrium  /  kinetics  /  phosphoric acid leaching  /  sulfuric acid leaching
Kui HUANG, Yan DING, Qiheng TANG, Rugui LI, Xinke SHAN, Yuanhuan LU, Siyan LU. Leaching Behavior and Kinetics of Scandium and Yttrium from Bayer Red Mud[J]. Mining and Metallurgical Engineering, 2024 , 44 (3) : 111 -115 . DOI: 10.3969/j.issn.0253-6099.2024.03.024
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Year 2024 volume 44 Issue 3
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doi: 10.3969/j.issn.0253-6099.2024.03.024
  • Receive Date：2023-12-09
  • Online Date：2026-03-17
  • Published：2024-06-01
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  • Received：2023-12-09
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    1.School of Resources, Environment and Materials, Guangxi University, Nanning 530004, Guangxi, China
    2.Key Laboratory of Environmental Protection (Guangxi University), Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, Guangxi, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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