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| New Process to Extract Valuable Metals from Bag Dust |
| Received:March 22, 2018 Revised:March 26, 2018 |
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| DOI：doi：10.3969/j.issn.1007-7545.2018.08.007 |
| KeyWord:bag dust; arsenic; zinc; sodium carbonate; leaching; sulfuric acid |
| Author | Institution |
| SHI Li-hua |
广东环境保护工程职业学院 广东 佛山 |
| JIANG Wei |
广东环境保护工程职业学院 广东 佛山 |
| WANG Wen-xiang |
广东环境保护工程职业学院 广东 佛山 |
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| Abstract: |
| A new process to extract valuable metals from bag dust was studied. Arsenic was removed by roasting with sodium carbonate and water-washing. Effects of dosage of sodium carbonate, roasting temperature and roasting time on arsenic removal were investigated. The results show that arsenic in washed slag is only 0.15% with removal rate of 99.85% and loss rate of zinc and copper is only 0.5% under the conditions including bag dust of 50 g, sodium carbonate dosage of 25 g, roasting at 600 ℃ for 2 h. Leaching rate of zinc and copper from water-washing residue is 98.53% and 97.65% respectively under the optimum conditions including concentration of sulfuric acid of 1.23 mol/L, leaching temperature of 90 ℃, and leaching time of 1.5 h. Zinc and copper can be separated by adding excess sodium hydroxide. Lead and tin in leaching slag can be received as Pb-Sn alloy by reduction smelting with carbon addition. |
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