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Exploration on Enrichment and Purification Technology of Associated Element Thorium in Bastnaesite
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Jia YAO, Jinyong WANG, Xusheng FANG, Duqing CHEN
Hydrometallurgy of China | 2026, 45(4) : 530 - 536
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Hydrometallurgy of China | 2026, 45(4): 530-536
• Experiment Research •
Exploration on Enrichment and Purification Technology of Associated Element Thorium in Bastnaesite
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Jia YAO, Jinyong WANG, Xusheng FANG, Duqing CHEN
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  • Leshan Shenghe Rare Earths Co., Ltd., Leshan　614802, China
Published: 2026-08-20 doi: 10.13355/j.cnki.sfyj.2026.04.009
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In view of the recovery and utilization of associated thorium resources and the control of radioactive pollution in the process of bastnaesite smelting, the migration and distribution characteristics of thorium elements in each link of smelting separation were systematically studied. After the pretreatment of bastnaesite by alkali decomposition, the leaching acidity was adjusted to 3-5 mol/L, and the thorium leaching rate was increased to 98%. Fe3+ in the feed solution was selectively removed by N235 extractant in advance, and then thorium was directional extracted by P507 extractant. The results showed that the saturated loading of thorium oxide in the diluted P507-sulfonated kerosene extraction system could reach 25 g/L. After oxalic acid back extraction, washing and burning at 1 000 ℃, the purity of thorium oxide in the final product reached 98.88%. The total yield of thorium is more than 96% for the raw material of bastnaesite containing 0.2% -0.3% thorium. The method is efficient and environmentally friendly, and has certain application potential in the release treatment of thorium-containing solid waste.

bastnaesite  /  thorium oxide  /  N235  /  P507  /  extraction  /  separation
Jia YAO, Jinyong WANG, Xusheng FANG, Duqing CHEN. Exploration on Enrichment and Purification Technology of Associated Element Thorium in Bastnaesite[J]. Hydrometallurgy of China, 2026 , 45 (4) : 530 -536 . DOI: 10.13355/j.cnki.sfyj.2026.04.009
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Year 2026 volume 45 Issue 4
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doi: 10.13355/j.cnki.sfyj.2026.04.009
  • Receive Date：2026-03-24
  • Online Date：2026-09-11
  • Published：2026-08-20
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  • Received：2026-03-24
  • Revised：2026-04-27
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    Leshan Shenghe Rare Earths Co., Ltd., Leshan　614802, 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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