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| Study on Preparation of Arsenic Trioxide from Arsenic-bearing Dust |
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Received:March 25, 2020
Revised:March 28, 2020
Accepted:March 30, 2020
Published Online:August 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.09.012 |
| KeyWord:arsenic-bearing dust; alkaline leaching; crystallization; reduction; arsenic trioxide |
| Author | Institution |
| Yi Yu |
江西华赣瑞林稀贵金属科技有限公司 |
| Ye Feng-chun |
江西华赣瑞林稀贵金属科技有限公司 |
| Wang Hong-jun |
江西华赣瑞林稀贵金属科技有限公司 |
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| Abstract: |
| Arsenic trioxide was prepared from arsenic-bearing dust through leaching with NaOH solution and reduction with sulfur dioxide. The results show that arsenic leaching rate is 99.27% under the conditions including concentration of NaOH solution of 3.0 mol/L, mass ratio of sulfur to arsenic-bearing dust of 0.075︰1, L/S of 6︰1, leaching time of 2.0 h, leaching temperature of 95 ℃, and agitation speed of 400 r/min. As2O3 content in reduction product is 95.79% with arsenic recovery of 86.13% under the conditions including initial concentration of arsenic of 100 g/L, initial pH value of 0, reaction temperature of 30 ℃, reaction time of 90 min, flow rate of SO2 of 0.8 L/(L?min), and agitation speed of 300 r/min. After dissolving in hot water and recrystallization, As2O3 purity is 99.63%, which meets the first grade standard of Nonferrous Metal Industry of China (YS-T99—1997). |
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