DESLUDGING ACID ZINC PLATING TANK
I am working on one electroplating plant of ammonium chloride acid zinc plating. Here the production rate or surface area treatment/plated per day is too high. There is regular increase in Iron content in the bath & we cannot stop our production. To remove this iron content we add Hydrogen Peroxide. This process creates lot of sludge/settlement. Which we are removing by our continuous filter system.
I have visited some automobile companies who use phosphating chemicals. There also continuous sludge formation takes place. They generally keep separate tank for settlement of sludge, in this tank continuous pumping of phosphating chemical from phosphating tank takes place & after settling of the sludge, chemical goes to filter press, where remaining sludge is also removed. Then this clear solution goes to main phosphating tank. This is continuous process & is very much important for higher & continuous production plant.
Is the same thing can be applicable to electroplating tank, by keeping one separate tank which will continuously remove iron by H2O2 & desludge by settlement, then filter & clear solution back to processing tank. If anybody knows about such system, please let me know.
DWP - Dubai
There are many different types of filters that can handle this problem, including sand filters and continuous paper filters. Yes, you could use a separate desludging tank but I've never heard of it because people simply don't find it necessary.
You should not be generating huge quantities of waste products unless parts are being dropped into the tanks and left there to dissolve away. And if they are, that is utterly unacceptable no matter what the demands of production.
Ted Mooney, P.E. RET
Pine Beach, New Jersey
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