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| Arsenic Removal Kinetics of Hydrothermal Sulfide Precipitation for Arsenic-alkali Residue from Antimony Smelting |
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Received:July 09, 2013
Revised:July 11, 2013
Accepted:July 12, 2013
Published Online:December 23, 2013
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| DOI：10.3969/j.issn.1007-7545.2014.01.003 |
| KeyWord:arsenic-alkali residue; sulfide precipitation; hydrothermal leaching; kinetics; purification rate |
| Author | Institution |
| WEI Yan-song |
河池学院 广西宜州 |
| DENG Xiao-wen |
河池学院 广西宜州 |
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| Abstract: |
| Arsenic-alkali residue was hydrothermally leached with sodium sulfide as precipitating agent. The kinetics of sulfide precipitation of arsenic removal was studied. The relationship between precipitation duration and purification rate were investigated under different temperature and dosage of sodium sulphide. Dynamic model was established. The results show that both reaction temperature and concentration of sodium sulfide have certain effect on arsenic purification process while the effect of reaction temperature on purification rate is less sensitive effect. Arsenic precipitation purification dynamics model fits for Avrami equation model with n=0.4261: -ln(1-x)=1057.33CA-0.4963t0.4261exp(-1.591×104/RT). Its apparent activation energy is 15.91 kJ/mol and reaction order is -0.496 3. The arsenic removal process is faster in reaction with diffusion controlled. |
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