Study on the control measures for the blockage of solution channel in CO2 + O2 leaching process
Received:January 30, 2022  Revised:February 16, 2022
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KeyWord:permeability; soluble immersion channel; precipitation; channel blocking; control measures; centralized filtration; micro-acid pre-acidification; solubility
                    
AuthorInstitution
WANG Ruyi 中核内蒙古矿业有限公司
WANG Jing 中核内蒙古矿业有限公司
LI Peng 中核内蒙古矿业有限公司
YANG Jing 中核内蒙古矿业有限公司
ZHENG Wenjuan 中核内蒙古矿业有限公司
NIU Ben 中核内蒙古矿业有限公司
XU Qi 中核内蒙古矿业有限公司
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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.
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