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- Title
Soluble immersion channel blocking control measures in CO<sub>2</sub>+O<sub>2</sub> leaching process.
- Authors
WANG Ruyi; WANG Jing; LI Peng; YANG Jing; ZHENG Wenjuan; NIU Ben; XU Qi
- Abstract
In the process of ground leaching uranium aching, permeability is the important factor that determining the leaching efficiency, and maintaining good permeability plays an important role in uranium leaching. At present, the blockage of the mineral layer scale reduces the mineral layer permeability and affects the leaching efficiency is the general problems existing in the operation of immersed mines. Based on the hydrogeological conditions of Naling ditch naluranium deposit and the generating mechanism of main sediment in CO2 + O2 underground uranium extraction test, to address the reducing permeability of the ore layer, by analyzing the type and characteristics of the sediment during the leaching process, to explore the main reasons of sediment generation and blockage of mineral layer, proposing to add CO2 for micro-acid pre-acidification within 20 to 30 days before the mining is operation until the HCO3-ion concentration is maintained at 1 000 mg/L, and adjust the environment of immersion channel, keep the main sediment at high solubility; Then inject oxygen for oxidation, and regulate the residual oxygen content at about 20 mg/L; Moreover, instead the current bag filtration method, the technical measures, such as the centralized filtration method, such as activated carbon, quartz sand, and cationic resin, removing the harmful metal ions from the dissolved solution effectively, reducing the formation of secondary precipitation in reinjection layer was used in the study, to control the generation and accumulation of sediment in the soluble immersion channel effectively, thus realize the efficient leaching operation of ground-dip uranium mines.
- Subjects
URANIUM ores; LEACHING; SAND; URANIUM mining; ACTIVATED carbon; METAL ions
- Publication
Nonferrous Metals (Mining Section), 2022, Vol 74, Issue 3, p59
- ISSN
1671-4172
- Publication type
Article
- DOI
10.3969/j.issn.1671-4172.2022.03.0010