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| Analysis of Solute Transportation and Acidification Process during In-situ Acid Leaching of Sandstone Uranium Ore |
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Received:January 04, 2015
Revised:January 06, 2015
Accepted:January 08, 2015
Published Online:May 20, 2015
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| DOI：doi：10.3969/j.issn.1007-7545.2015.06.013 |
| KeyWord:sandstone uranium ore; in-situ acid leaching; solute transportation; acidification of ore body |
| Author | Institution |
| HUANG Qunying |
新疆中核天山铀业有限公司 |
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| Abstract: |
| In order to investigate acidification process during acid leaching test of sandstone uranium ore, the transportation characteristics of solute ions, such as SO42-, H , Ca2 , Mg2 , Fe2 and Fe3 , which are closely related with water-rock interaction of in-situ uranium leaching, were analyzed. The results show in case of SO42-, it takes 8 days for the earliest leaching solution to reach extraction well, and 40 days to form a stable flow field by leaching solution. Ca2 and Mg2 move synchronously with SO42-. Retarded by water-rock interaction, the forefront of H plume reaches extraction well 13 days later than SO42-, and it takes 66 days to stablish balance between supply and consumption of H , in other words, formation of stable geochemical field for uranium leaching. But a further increase of acidity is still necessary to meet acidification requirements when the stable geochemical field is just built. The transportation process of Fe2 and Fe3 are controlled by H and affected by oxidation-reduction reaction, resulting in synchronous transportation of Fe2 and Fe3 with H . Gypsum remains saturated most of the time during leaching process due to high concentration of SO42- and Ca2 , and chemical blockage caused by gypsum precipitation is also conformed by drop of Ca2 concentration and extraction flux. |
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