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Galvanizing Flux : Wet or Dry Method
Galvanizing Flux : Wet or Dry Method The advantages and disadvantages of the dry and wet methods are still disputed, which is better? But the choice depends to a large extent on the quality of the products for galvanizing. The main advantages of the dry method • Higher production capacity. • Reducing the output Dross. • Lower operating cost. The main disadvantages of the dry method: • Needs a bath (more space) • Needs heating (energy consumption) • Needs continuous treatment or shut down to adjust the concentration of the tank and iron content • These equipments need continuous and periodic maintenance. The main advantages of the wet method: • Providing space and equipment (there is no bath or heating). • A layer of Flux on the surface of the zinc kettle gives a better cleaning of the products surface especially when there were errors in the previous stages. • In general, it gives less thickness of zinc, especially if the product is pulled through th...
Treatment and Utilization of Spent Acid that Used in Galvanizing ( Pickling )
1- 6 HCl + Fe 2 O 3 ----- 2 FeCl 3 + 3 H 2 O 2- Fe + HCl -------- Fe Cl 2 + H 2 The main concentration of pickling tank is 16% wt/ wt . The performance of the tank can't be effective when it reaches 5 wt/ wt . At this point the iron content is 150 gr / lit . it means you have ore or iron mine . There is more than one option to treat this consumed acid : · Acid Regeneration : it can be used on or off line by using special type of resins in order to get rid of iron then concentrate it to reach crystal stage as FeCl 3 and it is necessary to keep Fe ...
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