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重金属废气怎么处理?处理方法都有哪些?

2019/11/28 15:02:48

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    重金属废气的基本处理方法有:过滤法、吸收法、吸附法、冷凝法和燃烧法。
    一、含汞及其化合物废气处理
    含汞及其化合物废气处理一般处理方法:吸收法、吸附法、冷凝法和燃烧法。
    1、冷凝法-适合净化回收高浓度的汞蒸汽,常作为吸收法和吸附法净化汞蒸汽的前处理。
    2、吸收法
    A、 高锰酸钾溶液吸收法-适用于仪表电器厂的含汞蒸汽;
    B、 次氯酸钠溶液吸收法-适用于处理水银法氯碱厂含汞氢气;
    C、 硫酸-软锰矿吸收法-适用于处理炼汞尾气以及含汞蒸汽;
    D、 氨液吸收法适用于氯化汞生产废气的净化;
    E、 氯化法处理汞蒸汽
    3、吸附法
    A、 充氯活性炭吸附法适用于含汞废气处理;
    B、 活性炭吸附法适用于氯乙烯合成气中氯化汞的净化;
    C、 消化吸附法适用于雷汞的处理。
    4、燃烧法-适用于燃煤电厂含汞烟气的处理。采用循环流化床燃煤锅炉,燃烧过程中投加石灰石,烟气采用电除尘或袋除尘净化。
    二、铅及其化合物废气处理--铅及其化合物废气适合用吸收法处理。
    1、 酸液吸收法适用于净化氧化铅和蓄电池生产中产生的含铅烟气,也可用于净化熔化铅时所产生的含铅烟气。建议采取二级净化工艺:第一级采用袋滤器除去较大颗粒;第二级采用化学吸收。吸收剂一般采用醋酸。
    2、 碱液吸收法适用于净化化铅锅、冶炼炉产生的含铅烟气。吸收剂一般采用NaOH溶液。
    3、砷、铬、镉及其化合物废气处理  砷、铬、镉及其化合物废气通常采用吸收法和过滤法处理。
    含砷烟气应采用冷凝(200度以下)-除尘(袋除尘器)-石灰乳吸收法处理工艺 铬、镉及其化合物废气宜采用袋式除尘器过滤处理(风速小于1m/min)。

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