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| Low Acid Neutral In-situ Leaching of Uranium Mining with High Content of Carbonates Uranium Deposit |
| Received:September 13, 2015 Revised:September 15, 2015 |
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| DOI：doi：10.3969/j.issn.1007-7545.2016.02.008 |
| KeyWord:sandstone-type uranium deposit; in situ leaching; chemical blockage; low acid neutral leaching technology |
| Author | Institution |
| ZHANG Yong |
新疆中核天山铀业有限公司 |
| ZHOU Yipeng |
东华理工大学 |
| HUANG Qunying |
新疆中核天山铀业有限公司 |
| ZHANG Qinglin |
新疆中核天山铀业有限公司 |
| Hajieti |
新疆中核天山铀业有限公司 |
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| Abstract: |
| High content of carbonates is prone to cause chemical blockage during acid or alkaline in situ leaching for uranium mine at a sandstone-type deposit. The field pilot experiment of low acid neutral in situ leaching was conducted with 0.3 g/L of sulfuric acid solution as leaching agent, and hydrogen peroxide and oxygen as oxidants. PH value of leaching system is controlled at level of 6.1~6.7 to avoid calcium carbonate precipitation. Content of Ca2 and SO42- does not exceed 900 mg/L and 2100 mg/L respectively to control calcium sulfate precipitation. Reaction between acid and carbonates produces 400~450 mg/L of HCO3-, which can be used as complexant of uranyl. Recovery uranium concentration is 24~31 mg/L with oxidation of hydrogen peroxide, and it rises to 48~62 mg/L by 300~350 mg/L of oxygen. Compared with conventional acid or alkaline leaching process, low acid neutral leaching technology facilitates uranium leaching and avoids precipitation of both calcium sulfate and calcium carbonate. |
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