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| Mechanism Study on Crystallization in Pipeline during Iron Removal by Jarosite Method in Zinc Hydrometallurgy |
| Received:November 05, 2015 Revised:November 25, 2015 |
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| DOI：10.3969/j.issn.1007-7545.2016.04.001 |
| KeyWord:zinc hydrometallurgy; jarosite; solubility; scaling; ammonium sulfate; sodium sulfate; potassium sulfate |
| Author | Institution |
| xiao juan |
中南大学 化学化工学院 |
| wang wen lei |
中南林业科技大学 |
| zeng de wen |
中南大学 |
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| Abstract: |
| Based on comparative analysis on solubility phase diagrams of ternary systems M2SO4-ZnSO4-H2O (M=K, Na, NH4) concerned in zinc hydrometallurgical process, it is revealed that double salts (NH4)2SO4?ZnSO4?6H2O(s), Na2SO4?ZnSO4?4H2O(s), and K2SO4?ZnSO4?6H2O(s)) are much easier to precipitate from electrolyte solutions than their single salts (NH4)2SO4, Na2SO4, K2SO4, and ZnSO4?6H2O(s). Drops of solubility of these salts (-hydrates) with decreasing temperature can cause scaling on wall of pipelines. Lower solubility of (NH4)2SO4?ZnSO4?6H2O(s) makes it easier to scale when ammonium jarosite substitutes potassium jarosite or sodium jarosite to remove iron in zinc hydrometallurgy. |
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