The range of ZINCOVER products contain fluxes which serve two purposes of protecting and cleansing during melting and for recovery of Zinc from drosses.
Zinc is a metal which is very prone to oxidation, resulting in a high incidence of Zinc oxide inclusions and significant losses of metal in the dross. Use of ZINCOVER STD ensures oxidation to a minimum, and that non-metallic inclusions coalesce and float from the metal.
Drossing off flux
Under normal circumstances the dross from a melt of Zinc or Zinc base Alloy has a high metal content and benefit is obtained from reducing the residues and returning the metal to the melt in a single process in the melting unit. This is achieved by adding ZINCOVER-85 to the dross which produces an exothermic reaction and reacts with Zinc oxide dross releasing Zinc metal.
Sufficient ZINCOVER STD approx. 0.5% by weight is added during early stages of melting to form a cover. When charge is completely molten add another 0.5% and rabble the melt well. Melt is allowed to settle.
For Recovery of Drosses
For maximum efficiency the dross should be allowed to cool and blacken overall so that all flame has died out. When the melt temperature is around 480 C ZINCOVER-85 is added progressively until a powder residue is obtained on rabbling further. Quantity of ZINCOVER-85 depends upon the quantity of dross treated.
ZINCOVER compounds are hygroscoplic in nature. Containers should be kept securely closed when products are not in use.
Standard Packing : 20 kg HDPE jars.
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