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| Arsenic Removal from Arsenic Rich Zinc Dust |
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Received:January 13, 2014
Revised:January 14, 2014
Accepted:January 14, 2014
Published Online:May 28, 2014
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| DOI： |
| KeyWord:zinc dust; arsenic removal; sulfation roasting |
| Author | Institution |
| XING Peng |
Beijing General Research Institute of Mining and Metallurgy |
| WANG Cheng-yan |
Beijing General Research Institute of Mining and Metallurgy |
| YIN Fei |
Beijing General Research Institute of Mining and Metallurgy |
| LI Qiang |
Beijing General Research Institute of Mining and Metallurgy |
| YANG Bo |
Beijing General Research Institute of Mining and Metallurgy |
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| Abstract: |
| The low-temperature sulfation roasting process was chosen to make the arsenic in arsenic-rich zinc dust was volatilized out as As2O3 and collected by dust collection system. Zinc, indium and germanium were transformed into the sulfate to achieve the separation with arsenic. Factors investigated under batch test conditions included amount of sulfuric acid, roasting temperature and time. The optimum amount of sulfuric acid, roasting temperature and time were found to be 1.2 times the theory, 300℃ and 3h, respectively, under these conditions the arsenic removal ratio reached 78.28%. A small amount of arsenic leached into the solution during the calcine leaching process was precipitated with iron by oxidative-hydrolysis precipitation. Arsenic-iron slag was mixed with the zinc dust and roasted again, the removal ratio of arsenic reached 70.39%. |
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