The filtration behavior of crude zinc oxide after sulphuric acid leaching
碩士 === 國立成功大學 === 資源工程學系碩博士班 === 100 === Crude zinc oxide is the product of the Waelz kiln process for the processing of EAF dust. With increasing amount of EAF dust produced in Taiwan, many company jump into the production and sale of crude zinc oxide to downstream firms for manufacturing of zinc o...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/95503624740207880553 |
| Summary: | 碩士 === 國立成功大學 === 資源工程學系碩博士班 === 100 === Crude zinc oxide is the product of the Waelz kiln process for the processing of EAF dust. With increasing amount of EAF dust produced in Taiwan, many company jump into the production and sale of crude zinc oxide to downstream firms for manufacturing of zinc oxide. Crude zinc oxide is a valuable resource with high zinc content (〉40%). it also contains other valuable metals such as lead and iron. Usually the zinc in crude zinc oxide was recovered by sulphuric acid leaching and filtration. However, the filterability of leachate produced by sulphuric acid leaching is very poor.
Therefore, the objective of this study focused on the filterability improvement of leachate produced by sulphuric acid leaching. The filterability was evaluated by parameters such as the residue particle size analysis and Specific Resistance to Filtration(SRF). The results of this study show that using 0.6 N of HCl can destroy the structure of zinc-iron spinel in leachate and the size of residued PbSO4 particles is mainly distributed around 10 μm. The ZnFe2O4 particles mainly distributed in the sze range of 1 ~ 5μm, and is the main cause of poor filterability.
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