Disposal of the product obtained after salt extraction from HPF desulfurization wastewater
Thread Content
The desulfurization waste fluid generated by our company’s HPF desulfurization system is processed using a one-step salt extraction method; the purity of the resulting ammonium thiocyanate is only 95%, which makes it unsellable. As a result, it accumulates in our warehouses. Does anyone have any good ideas on how to dispose of this ammonium thiocyanate or ways to improve its purity? (Process: Desulfurization waste liquid — Ammonia evaporation — Decolorization — Activated carbon filter press — Oxidation tower (unused) — Concentration tank A — Plate and frame filtration — Adjustment tank — Filter press — Crystallization tank — Centrifuge — Solid from plate and frame filtration after Concentration tank A for ammonium thiocyanate — Dissolution — Filter press — Concentration tank B — Centrifuge — Ammonium sulfate)
The overall thiocyanate market is sluggish; currently, the price of 98% grade is only around 1,200. You can improve the purity through washing or redissolution and then find a way.
Has thiosulfuric acid A not been oxidized? It is recommended to turn on the oxidation tower to oxidize thiosulfate AN to sulfate AN.
As introduced by the poster, the process flow includes an oxidation tower.
Our company can help you solve the problem. Call 13393096567
I have read similar articles before; you might want to take a look: 1. Thiosulfate AN in the waste liquid is completely converted into sulfuric acid AN through catalytic oxidation. At this point, the waste liquid contains only ammonium thiocyanate and sulfuric acid AN, and these two salts have significantly different solubilities. Subsequently, higher concentrations of ammonium thiocyanate and sulfuric acid AN can be obtained through evaporation and crystallization. 2. By selecting catalysts with high activity, thiosulfates can be oxidized to sulfates economically under milder conditions using air as an oxidant.
I’ve met many people who have tried to extract salt from factories, and many of them were deceived. Extracting salt involves risks, so one needs to be cautious
Your process can be replaced; it’s too outdated