Can the pickling process for stainless steel equipment be replaced?
Thread Content
The manufacturing of stainless steel equipment requires a pickling process, and this process generates large amounts of pickling wastewater that is harmful to the environment. Are there any alternatives to pickling?
No, the pickling waste liquid needs to be neutralized to meet emission standards.
The pickling waste liquid is discharged after being neutralized with alkali; how can heavy metal ions be removed?
The so-called emissions here are discharged by the factories after simple treatment into the industrial wastewater treatment system of the park, where they are processed uniformly by a wastewater treatment plant.
Can alkali washing be used as a substitute for acid washing?
A passivation film cannot be formed, so it cannot be used as a substitute. Only treat waste liquid.
Passivation using oxidizing agents ensures the integrity and stability of the passivation film. Acid pickling passivation causes iron and its oxides to dissolve preferentially over chromium and its oxides, removing the chromium-poor layers and resulting in an accumulation of chromium on the surface of the stainless steel, thereby enhancing its corrosion resistance. There are many passivation pastes available for factories these days. I’m not sure how effective alkaline passivation solutions are.
Theoretically, the industrial wastewater containing heavy metals is not accepted by the wastewater treatment plant in the park.
:Lol, polish it first and then wax it, haha! ! ! :lol:lol
These are tactics used by some unscrupulous vendors on fruits.