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首页> 外文期刊>Erzmetall >The Behaviour of Selenium(VI) and Selenium(IV) Dyring the Precipitation of Jarosite-type Compounds
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The Behaviour of Selenium(VI) and Selenium(IV) Dyring the Precipitation of Jarosite-type Compounds

机译：黄铁矿型化合物沉淀过程中硒（VI）和硒（IV）的行为

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摘要

The behaviour of low concentrations of selenium(VI) (sel-enate) and selenium(IV) (selenite) during the precipitation of sodium, potassium and ammonium jarosites was investigated. The selenate content of the jarosite species increased linearly as the Se(VI) concentration of the solution increased up to 2000 mg/L. Supporting mineralogical studies indicated that selenate substituted for sulphate in the jarosite structure with selenate contents up to 3.3 % being detected. A consequence is that increasing sulphate concentrations reduce the extent of selenate incorporation. As the concentration of Se(IV) increased up to 5000 mg/L, the selenite contents of the sodium jarosite increased lin-early and the SO4_ contents decreased in an inversely related manner. Experiments done in the presence of 1.15 M ZnSO4_ gave essentially the same results, indicating that selenite incorporation is not competitive with that of sulphate. Only sodium jarosite was detected in the products containing less than ~7 % SeO_3, but increasing amounts of a ferric selenite-sulphate phase and elemental selenium were evident in products having higher SeO_3 contents.
机译：研究了钠，钾和铵黄钾铁矿沉淀过程中低浓度硒（VI）（硒烯）和硒（IV）（硒）的行为。随着溶液中Se（VI）浓度增加到2000 mg / L，黄铁矿中硒酸盐的含量线性增加。支持性的矿物学研究表明，硒酸根替代了黄钾铁矾结构中的硫酸根，硒酸根含量高达3.3％。结果是增加的硫酸盐浓度降低了硒酸盐掺入的程度。随着Se（IV）的浓度增加到5000 mg / L，黄钾铁矾的亚硒酸盐含量线性增加，而SO4_含量却呈负相关。在1.15 M ZnSO4_存在下进行的实验给出了基本相同的结果，表明亚硒酸盐的掺入与硫酸盐的掺入没有竞争性。在SeO_3含量小于约7％的产品中仅检测到黄钾钠，但在SeO_3含量较高的产品中，明显可见亚铁-硫酸铁相和元素硒的含量增加。

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