置换沉淀，是把一种化学活性较强（标准还原电势小）、价格较低的金属，加入另一种活性较弱（标准还原电势大）的金属盐溶液中，使后一种金属沉淀出来的方法。
净化过程主要是加入锌粉到溶液，这样所有电位序在锌之后的元素都被置换出来并且凝固沉淀下来。
Purification is mainly done by adding zinc dust to the solution. As all the elements to be removed lie below zinc in the electrochemical series they can be precipitated by cementation.
研究了以炼锌厂废泥为原料，经氧化、酸浸、 中和沉淀、稀硫酸溶解、 置换等步骤制取硫酸铜、海绵镉和硫酸锌的工艺。
Prepared copper sulfate, sponge cadmium and zinc sulfate from abandoned mash of zincmaking plants following the step of oxidization, soaking in acid, neutralization sedimentation, replacement, etc…
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