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Column Leaching Experimental Study on Acid-agglomerated of a Low-grade Uranium Ore in Namibia
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Yang LIU1, Jiewei ZHANG1, Wensheng TANG1, Nan HU2, Hui ZHANG2, Dexin DING2
Uranium Mining and Metallurgy | 2026, 45(2) : 41 - 48
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Uranium Mining and Metallurgy | 2026, 45(2): 41-48
• Mining and Hydrometallurgy •
Column Leaching Experimental Study on Acid-agglomerated of a Low-grade Uranium Ore in Namibia
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Yang LIU1, Jiewei ZHANG1, Wensheng TANG1, Nan HU2, Hui ZHANG2, Dexin DING2
Affiliations
  • 1.China General Nuclear Power Group (CGN) Uranium Resources Co., Ltd., Beijing 100029, China
  • 2.Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
Published: 2026-05-20 doi: 10.13426/j.cnki.yky.2025.08.10
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This study investigated parameter optimization for heap leaching of a low-grade uranium ore from Namibia deposit through systematic column leaching experiments. Mineralogical composition analysis shows that the uranium ore contains a high proportion of high acid consuming gangue minerals, with tetravalent uranium accounting for 68 %. The main uranium minerals are easily leached uraninite and coffinite. The uranium is enriched of in the fine-grainedportion. After crushing to-8 mm, the mass fraction of fine-grained uranium at -0.425 mm reaches 15.09 %, and its uranium grade is as high as 0.032 %, which leads to the deterioration of direct heap leaching permeability and requires acid-agglomeration pretreatment. Column leaching experiments established the optimal parameter combination : irrigation rate of 20 L/(h·m2), heap height of 9 m, aciddosage for pre-agglomeration of 20 kg/t, binder dosage of 125 g/t, and initial leachate acidity of 100 g/L H2SO4. Under optimized conditions, the irrigation duration is shortened to 55 d, and the uranium extraction rate is increased to 80 %. This study has demonstrative significance for the development of similar low-grade, high acid consumption, high fine-grained, and high tetravalent uranium resources.

low-grade uranium ore  /  acid mixing and granulation  /  column leaching  /  heap leaching
刘洋, 张杰伟, 唐文生, 胡南, 张辉, 丁德馨. 纳米比亚某低品位铀矿石拌酸制粒柱浸试验研究. 铀矿冶, 2026 , 45 (2) : 41 -48 . DOI: 10.13426/j.cnki.yky.2025.08.10
Yang LIU, Jiewei ZHANG, Wensheng TANG, Nan HU, Hui ZHANG, Dexin DING. Column Leaching Experimental Study on Acid-agglomerated of a Low-grade Uranium Ore in Namibia[J]. Uranium Mining and Metallurgy, 2026 , 45 (2) : 41 -48 . DOI: 10.13426/j.cnki.yky.2025.08.10
Appendix
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Year 2026 volume 45 Issue 2
66
15
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Article Info
doi: 10.13426/j.cnki.yky.2025.08.10
  • Receive Date：2025-08-22
  • Online Date：2026-09-28
  • Published：2026-05-20
Article Data
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History
  • Received：2025-08-22
  • Revised：2025-10-20
Affiliations
    1.China General Nuclear Power Group (CGN) Uranium Resources Co., Ltd., Beijing 100029, China
    2.Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, 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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