نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار، گروه مهندسی مواد و متالورژی، دانشگاه صنعتی همدان، همدان، ایران.
2 استادیار، گروه مهندسی معدن، دانشگاه صنعتی همدان، همدان، ایران.
3 دانشجوی کارشناسی ارشد، گروه مهندسی مواد و متالورژی، دانشگاه صنعتی همدان، همدان، ایران.
4 دانشجوی کارشناسی، گروه مهندسی مواد و متالورژی، دانشگاه صنعتی همدان، همدان، ایران.
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The recycling of steel-making dust was investigated using the leaching process in sulfuric acid and the separation of zinc ions by solvent extraction method. Due to the high chloride content of steel-making dust, the spent used in the experiments after the completion of the processes in the first cycle was returned to the beginning of the steel-making furnace dust recycling process to investigate the effect of chloride ions on the extraction of zinc metal. Aqueous solution was prepared by dissolving steel-making dust in sulfuric acid and followed by precipitation of iron in hydroxide form. To separate zinc from aqueous solution, D2EHPA agent was used at a constant temperature of 25 ºC and the ratio of aqueous to organic phase was 1:1. The effect of pH parameter in the range of 1-5 and volume concentration of extractant 5-30% on the extraction of zinc in three cycles of return spent were investigated. According to the results, an increase in pH up to about 3, the extraction of zinc increased enormousely, and the extraction was almost complete at higher than 3. Also, an increment in D2EHPA concentrationenhanced the zinc extraction and the optimum extraction was found to be 30%. Thermodynamic calculations showed that the main active ion of zinc in the leaching solution is Zn2+ and in the first cycles, it controls the absorption mechanism by the D2EHPA extractant. The fitting of thermodynamic data for the 10th cycle also showed that the molar percentage of ZnCl+ species changes from 2.05 % to 12.86%.
کلیدواژهها [English]