Removal of heavy metal ions in wet lead smelting
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For the unit’s wet lead smelting process, after desulfurization it is necessary to remove heavy metals from the sodium sulfate solution. According to the process documents, sodium sulfide and ferric sulfate are used to eliminate these heavy metals. Sodium sulfide can remove most heavy metal ions, but does ferric sulfate serve to flocculate the substances or to oxidize the S ions? dizzy:
There are probably both reasons related to ferrous sulfate; I’ve seen them add it when treating water as well.
In general, when treating wastewater, ferric sulfate or ferrous sulfate is added primarily to take advantage of its flocculating effect during precipitation.