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    • 5. 发明授权
    • Process for removing heavy metals from a caustic fluid stream
    • 从苛性液体流中除去重金属的方法
    • US06352675B1
    • 2002-03-05
    • US09326959
    • 1999-06-07
    • John T. Malito
    • John T. Malito
    • C22B1900
    • C01F7/0653C01F7/0633C01F7/47C22B3/44C22B21/0015Y02P10/234
    • The present invention provides both reagents and a process for removing heavy metals from a caustic fluid stream by the addition of reagents which are not corrosive or deleterious. Specifically, the present invention is directed to removing heavy metals from a Bayer liquor in an aluminum processing plant. The reagents, dithiocarbamate and dithocarbonate groups, are added individually or in combination thereof to the Bayer liquor for the removal of heavy metals, such as zinc. The reagents form a complex with the heavy metal for the precipitation of the metal from the fluid stream. Once a complex is formed, the Bayer liquor is held in a quiescent state for a period of time sufficient for settling out of solution the precipitate. After settling out of solution, the precipitate is separated and removed and the Bayer liquor is then further processed into alumina.
    • 本发明提供了两种试剂和通过加入不具腐蚀性或有害性的试剂从苛性液体流中除去重金属的方法。 具体地,本发明涉及从铝加工厂中的拜耳液中除去重金属。 将试剂二硫代氨基甲酸酯和二碳酸酯基团单独或组合加入到拜耳液中以除去重金属如锌。 试剂与重金属形成复合物,用于从流体流中沉淀金属。 一旦形成复合物,拜耳液体将处于静止状态,持续一段时间,足以沉淀出沉淀物。 沉淀出溶液后,分离并除去沉淀物,然后将拜耳液进一步加工成氧化铝。