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| Removal of Silica from Uranium Solutions by KemEcal 4968 Coagulant |
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Received:July 23, 2024
Revised:August 27, 2024
Accepted:August 28, 2024
Published Online:November 17, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.12.010 |
| KeyWord:KemEcal 4968; coagulant; desilication; uranium; polycarboxylic acid; uranium mine; acid leaching |
| Author | Institution |
| LI Xiao |
中广核铀业发展有限公司 |
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| Abstract: |
| Uranium ore acid hydrometallurgy uses concentrated sulfuric acid to leach uranium element from the ore, and the silicate in the ore forms an accumulation of silica in the leach solution after being leached accompanying other substances, which adversely affects the ion exchange and solvent extraction processes. A new type of polycarboxylic acid coagulant KemEcal 4968 was used to remove silicon from the leaching solution (PLS) and leaching slurry (LDS) of CGN Namibia""s Husab Uranium Mine at the dosage of 30, 70 and 140 mg/L, respectively. The results show that the silica removal rate of KemEcal 4968 coagulant at the dosage of 30—140 mg/L is 42%—62% for PLS solution, but only 11% for LDS solution; KemEcal 4968 does not cause the loss of uranium and iron components in the system during the process of silicon removal; The effect of residual KemEcal 4968 coagulant in the PLS has little effect on solid settling rate and turbidity of supernatant of counter current decant (CCD). KemEcal 4968 coagulant is a good alternative reagent for silica removal in this mine. Considering the effect of removing silicon and avoiding excessive residue of KemEcal 4968 coagulant, as well as too much silicon precipitating will increase the density of CCD underflow and affect the pumping performance, it is recommended that the dosage of KemEcal 4968 coagulant should be 30 mg/L. |
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