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什么是沉淀物網捕機理?
時間:2021-08-28?? 瀏覽:691次

  當金屬鹽(如硫酸鋁或氯化鐵)或金屬氧化物和氫氧化物(如石灰)作凝聚劑時,當投加量大得足以迅速沉淀金屬氫氧化物(如Al(OH)3、Fe(OH)3、Mg(OH)2或金屬碳酸鹽(如CaCO3)時,水中的膠??杀贿@些沉淀物在形成時所網捕。當沉淀物是帶正電荷(Al(OH)3及Fe(OH)3在中性和酸性pH范圍內)時,沉淀速度可因溶液中存在陰離子而加快,例如硫酸根離子。此外水中膠粒本身可作為這些金屬氧氧化物沉淀物形成的核心,所以凝聚劑投加量與被除去物質的濃度成反比,即膠粒越多,金屬凝聚劑投加量越少。

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