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| Study on Blockage Mechanism of In-situ Leaching Sandstone-type Uranium Mining in High-TDS Groundwater Area |
| Received:January 30, 2013 Revised:January 31, 2013 |
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| DOI：10.3969/j.issn.1007-7545.2013.08.008 |
| KeyWord:in-situ leaching of uranium; high-TDS groundwater area; blockage; geochemical model |
| Author | Institution |
| JIAO Xueran |
中国地质大学北京 |
| SUN Zhanxue |
东华理工大学 |
| Zhang Xia |
河南城建学院 |
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| Abstract: |
| Blockage tended to occur in high-TDS groundwater area in Xinjiang, China when sandstone-type uranium deposit was acid or alkaline in-situ leached of uranium. The blockage mechanism was discussed based on geochemical simulation PHREEQCI and a series of in-lab experiments. The results show that the main factors to cause blockage are high concentration of TDS, Ca2 , Mg2 , SO42-, and HCO3- in groundwater, which are 8~12 g/L, 386.17~775.95 mg/L, 250.83~377.21 mg/L, 2 036.47~2 436.08 mg/L and 108.66~527.55 mg/L, respectively. Calcite and gypsum are close to saturation state. chemical jamming occurs with the formation of calcite and gypsum deposit respectively produced by acid or alkaline in-situ leaching of uranium. The dilution or treatment-weak alkaline technologies are feasible to treat sandstone uranium ores. |
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