Recyclable CuS sorbent with large mercury adsorption capacity in the presence of SO2 from non-ferrous metal smelting flue gas
Recyclable CuS sorbent with large mercury adsorption capacity in the presence of SO2 from non-ferrous metal smelting flue gas
复制标题
有色金属冶炼烟气中SO2存在下具有大汞吸附能力的可回收CuS吸附剂
DOI：
10.1016/j.fuel.2018.08.062
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发表时间：
2019-01-01
期刊：
影响因子：
7.4
通讯作者：
Yan, Naiqiang
中科院分区：
文献类型：
--
作者：
Liu, Wei;Xu, Haomiao;Yan, Naiqiang
有色金属冶炼烟气中气态元素汞（Hg-0）与高浓度SO2共存，传统吸附剂难以去除。由于CuS在SO2条件下对Hg-0有很大的吸收能力，因此选择CuS作为有色金属冶炼烟气中Hg-0的脱除剂。Hg-0吸附实验表明，CuS对Hg-0的吸附量最大，ZnS、CdS、MnS和SnS对Hg-0的吸附量最小。在50 ℃时，CuS对Hg-0的吸附速率和吸附容量分别为0.0716 mg/（g·min）和50.17 mg/g，穿透阈值为50%。此外，还考察了反应温度、气体组成（O-2、SO2、H2O、SO 3）等因素对Hg-0脱除效果的影响。O-2、H_2O和SO_2对Hg-0捕集的影响很小。然而，SO 3与汞竞争吸附位，导致汞吸附容量下降。XPS分析和Hg-TPD结果表明，材料表面吸附的汞主要以HgS的形式存在。CuS在低温SO2气氛下具有较高的汞吸附能力，有望成为有色金属冶炼烟气中Hg-0捕集材料。它们可以与静电除雾器（ESD）一起使用，上游进入酸厂用于SO2回收。
Gaseous elemental mercury (Hg-0) is difficult to dispose using traditional sorbents when co-existed with high concentration of SO2 from non-ferrous smelting gas. CuS was selected for Hg-0 removal from non-ferrous metal smelting flue gas due to large Hg-0 uptake capacity under SO2 condition. Hg-0 removal experiments indicated that CuS has the largest Hg-0 adsorption capacity compared to that of ZnS, CdS, MnS and SnS. The Hg-0 adsorption rate and capacity of CuS at 50 degrees C was 0.0716 mg/(g.min) and 50.17 mg/g with 50% breakthrough threshold, respectively. In addition, the effects of reaction factors such as reaction temperatures and gas components (O-2, SO2, H2O, SO3) on Hg-0 removal performances were investigated. O-2, H2O and SO2 showed negligible influences on Hg-0 capture. However, SO3 competed with mercury for adsorption sites, resulting in a decrease of mercury adsorption capacity. The XPS analysis and Hg-TPD results indicated that the adsorbed mercury mainly existed as HgS on the material surface. CuS exhibited high mercury adsorption capacity under SO2 atmosphere at low temperature, appeared to be a promising material for Hg-0 capture from non-ferrous metal smelting flue gas. They can be used co-benefit with electrostatic demister (ESD), upstream entering the acid plant for SO2 recovery.