Full
Outline
The TiCl3-K2Cr2O7 redox titration method is used to determine the concentrations of Fe2+/Fe3+ in the solution after oxygen pressure leaching, neutralization, and iron removal of zinc hydrometallurgy. The results show that for samples with high iron concentrations (10-20 g/L), the relative error of this method is controlled within 2%, and the relative standard deviation (RSD) is less than 1%. For low iron concentration samples (around 1 g/L), the relative error remains below the permissible standard. The spike recovery test achieves a recovery rate of 100.1% with RSD of 0.32%. This method effectively improves the accuracy of endpoint judgment by accurately controlling the endpoint of 'tungsten blue'. The interference elements such as copper ions are separated by ammonia water, which reduces the influence of other metal ions on the determination. At the same time, a clear and simple two-step redox procedure is adopted:the excess Ti3+ is first oxidized with air to avoid the interference of titanium ions, so that only Fe2+ to be measured remains in the system, and then the titration is carried out with potassium dichromate. The titration end point is determined with sodium diphenylamine sulfonate as the indicator. The color of the solution changes from green to purple/blue, and the color change is sensitive and stable, which effectively reduces the subjective error, thus realizing the rapid and accurate determination of Fe2+/Fe3+ in complex polymetallic solution. This method is especially suitable for high-content iron systems, which can provide a reliable analysis method for zinc hydrometallurgy process control.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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