Iron Removal System Ferrious Iron Removal Solution of Hot Dip
Galvanizing
If the flux not treated before hot galvanizing , the Fe2+ and HCl
solution will attached to the workpiece surface, and then put into
zinc tank with workpiece together, it will not only affect the
galvanizing quality but also increase the zinc consumption, produce
a large number of zinc slag(zincilate), zinc ash and zinc powder,
this result in the galvanizing quality declined.so it is necessary
to remove Fe2+ and HCl from the flux.
At initial status, both of the the and ‚ are full, and tƒ is
empty, after sometime for using of fluxing solution and it needs
treatment, open “pump 2”, at this time the fluxing solution in ƒis
pumped into , when it is full, the fluxing solution overflow into
‚through overflow pipe, when the ‚is full, “pump 2 “can be closed,
then blow the fluxing solution in ‚, add air and chemicals, leave
it calm for sometime, open “pump 1”, fluxing solution in treating
tank ‚is pumped into pressure filter by “pump 1”, after filter it
flows into transition tankƒ, the precipitation is carried out of
factory, this process is repeated, which can achieve fluxing
recycling and regeneration.
Technological process
Pickling——Rinsing——Fluxing——Dring——Galvanizing——Cooling——Passivation
Fluxing is a process before galvanizing.
After rinsing put the black workpieces into the fluxing tank, keep
them in ZnCI2—NH4CL double salt aqueous solution about 0.5～1min, heating to keep the
temperature during 50～70℃.
Zinc ash is mainly composed of ZnO, Zn and metal chloride etc..
Per 1kg zinc ash contains Zinc >800g .
Zinc consumption that caused by ash occupied 20〜30% of total amount
of zinc.
