Abstract
Flux skimming as the specific waste forms on the surface of molten zinc in a separate section kettle during the wet batch hot-dip galvanizing. After the certain hot dip galvanizing time flux becomes less effective and loses its function. It is hazardous waste containing a significant amount of zinc. This work deals with the hydrometallurgical processing of flux skimming. Flux skimming sample containing 36.9% of Zn was supplied by the Slovak company operating wet batch hot-dip galvanizing. 
Flux skimming was hydrometallurgicaly processed by leaching in the distilled water in which the ratio of L:S (4:1, 6:1, 8:1, 10:1, 12:1) and the influence of temperature on zinc extractions at different temperatures, 20°C, 40°C, 60°C, 80°C, were investigated. According to the experimental results optimal L:S ratio and temperature were determined. Leaching of flux skimming in hydrochloric acid media was also carried out. Based on the results it is obvious that Zn leaching in hot water (60°C) proceed fast and the highest efficiency of Zn leaching was reached in the first 5 to 10 minutes. The flux skimming leaching in 0,2M HCl media appears not to have any measurable effect on efficiency of zinc leaching.