Abstract
The removing of suspended dross in galvanized zinc is the key point to obtain defect free coatings and inhibit the generation of solid wastes including surface and bottom dross which are detrimental to preserving environment. A supergravity technology was used to induce the galvanized zinc liquid to be purifying through ceramic foam filter (Al2O3 CFF). Al-Fe intermetallic were the dominant inclusions and precipitated in the galvanized zinc liquid as suspended dross. During the processing of purifying galvanized zinc liquid, inclusions were intercepted on the surface of Al2O3 CFF as residue by the way of being wrapped in oxide film, and some fine inclusions were captured in the filter. The removal ratio of Fe (RFe), loss percentage of Al (LAl) and the yield of zinc (YZn) respectively reached 76%, 63% and 96% at T = 450 °C and G= 50 through the Al2O3 CFF with pore size of 170 ppi and thickness of 20 mm. According to the exploratory experiment on the purification, a continuous purification was further performed for completing engineering scale purification of galvanized zinc liquid. RFe of 73% and LAl of 59% were obtained after the process of continuously purifying 8 kg molten galvanized zinc.
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