用液体阳离子交换剂(如羧酸)从浸出液中萃取金属离子时,因至少要加入与被萃金属等当量的碱,一般认为,这种萃取在工业上应用是有妨碍的。除主要的碱费用负担外,将额外的化学试剂加到过程中还必须在萃取后阶段除去或回收这些试剂。此外,加入的化学试剂常会污染环境。 Extraction of metal ions from leachate with liquid cation exchangers, such as carboxylic acids, is generally considered to be obtrusive in industrial applications due to the addition of at least a base equivalent to the metal being extracted. In addition to the major caustic costs, it is also necessary to remove or recover these reagents during the post-extraction phase when additional chemicals are added to the process. In addition, the added chemical often pollutes the environment.