Recently, the Hg⁰ re-emission from flue scrubbing solutions has become a research focus. The objective of this study was to evaluate the influence of arsenite on Hg⁰ re-emission by investigating critical important parameters, including the arsenite ion concentration, pH values, solution temperature, fluorine ion concentration, and chlorine ion concentration. The experimental results indicate that arsenite could directly reduce Hg²⁺ to Hg⁰ and promote the decomposition of Hg(SO₃)₂^2–. High pH, temperature, and chlorine ion concentration contributed to the inhibition of Hg⁰ re-emission, but the fluorine ions had little effect. The mechanism research suggests that the formation of unstable HgH₂AsO₃⁺ at low arsenite concentration accelerates Hg⁰ re-emission. For the Hg(II)–As(III)–S(VI) system, the formation of unstable HgSO₃H₂AsO₃^– than Hg(SO₃)₂^2– could increase Hg⁰ re-emission. With an increase in arsenite concentration, the formation of Hg(H₂AsO₃)₂ (which comes from the reaction between HgSO₃H₂AsO₃^– and H₂AsO₃^–) contributes to the suppression of Hg⁰ re-emission. The results of this study are conducive to providing new insight into Hg⁰ re-emission and mercury control.

中文翻译：

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冶炼烟气净化过程中汞的再排放：砷的影响

最近，烟道气洗涤液中的Hg ⁰再排放已成为研究的重点。这项研究的目的是通过研究关键的重要参数，包括砷离子浓度，pH值，溶液温度，氟离子浓度和氯离子浓度，来评估砷对Hg ⁰再排放的影响。实验结果表明，亚砷酸盐可直接将Hg ²⁺还原为Hg ⁰并促进Hg（SO ₃）₂ ^2–的分解。高pH，高温度和氯离子浓度有助于抑制Hg ⁰再排放，但氟离子影响不大。机理研究表明，在低砷浓度下形成不稳定的HgH ₂ AsO ₃ ^+会加速Hg ^0的再排放。对于汞（II）-As（III）-S（VI）系统，不稳定HgSO形成₃ ħ ₂ ASO ₃ ^-比汞柱（SO ₃）₂ ^2-能提高汞⁰再次发射。随着亚砷酸盐浓度的增加，Hg（H ₂ AsO ₃）_2的形成（来自HgSO ₃ H ₂ AsO之间的反应₃ ^–和H ₂ AsO ₃ ^–）有助于抑制Hg ^0的再排放。这项研究的结果有助于提供有关Hg ⁰再排放和汞控制的新见解。