Leaching of low permeable sandstone uranium ore using auxiliary materials: anionic surfactants
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A low-grade and permeable sandstone uranium samples in Inner Mongolia prospect, China was subjected to Na2CO3/NaHCO3 leaching. The uranium dissolution mechanism was investigated by effects of leaching parameters and the shrinking core model was selected to model uranium leaching reactions. Agitation leach tests showed that the maximum uranium leaching rate reached 96.5% at 25 °C and had an 19% yield increase when added of 1 mg/L the anionic surfactant to the leaching solution. The optimum process operating parameters were: molar ratio of Na2CO3:NaHCO3 1:1, solid–liquid ratio 1:6, contact time 4 h, agitation speed 400 rpm and the surfactant concentration in leach liquor with 1 mg/L. The kinetics equations indicated that the reactions appear to mix control turn to layer diffusion control with the surfactants adding.
KeywordsAnionic surfactant Shrinking core model Uranium ore Permeable sandstone Leaching rate
This research was supported by the National Natural Science Foundation of China (Grant No. 51874180), the double first-class construct program of USC (2017SYL05), the Hunan province engineering research center of radioactive control technology in uranium mining and metallurgy & Hunan province engineering technology research center of uranium tailings treatment technology (2019ykzx1002) and Hengyang Key Laboratory of Soil Pollution Control and Remediation (2018HPT06).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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