What is the reaction process of acidification-volatile-re-neutralization treatment of cyanide-containing wastewater?
HCN is highly volatile (boiling point 26 ° C) and is therefore easily separated from the solution by air separation, especially at low pH. To facilitate a metal cyanide complex by dissociation rate applicable to HCN, it is necessary to lower the pH.
The method consists of three steps: acid method, volatilization and neutralization (A·V·R=AVR): 1 acidification, dissociation of CN in metal cyanide complex and conversion to HCN; 2 bubbling with strong air bubbling HCN, the recycled HCN is repeatedly recycled by the lime liquid; 3 the inflated acidic lean liquid is neutralized to remove the metal ions (then, the metal precipitate is recovered, and the solution is discharged). The chemical process of this method is as follows:
Acidification Ca(CN) 2 +H 2 SO 4 -CaSO 4 +2HCN
Absorption 2HCN+Ca(OH) 2 - Ca(CN) 2 +2H 2 O
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