| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 213754 | International Journal of Mineral Processing | 2015 | 9 Pages |
•The coarse-grained fraction of zinc ash was melted using centrifugal force.•The highest zinc recovery (87% ± 2%) was achieved at 500 and 550 °C.•High purity of the smelted zinc was proved.•Decomposition of simonkolleite leads to formation of ZnO.
Zinc ash generated during the hot dip galvanizing process is an important source of secondary zinc. The result of zinc ash processing technologies is the formation of zinc in the metallic form or in the form of zinc compounds. The present paper is aimed at possibilities of metallic zinc recovery from the coarse-grained fraction of zinc ash (d > 1.25 mm) from hot dip galvanizing by the pyrometallurgical process on designed laboratory equipment. Designed equipment for laboratory experiments used centrifugal force and protective atmosphere of a nitrogen flow during the process of melting and separation of zinc. The aim of the pyrometallurgical processing study on the designed equipment was to investigate the effect of time (30, 60, 90 min) and temperature (480, 500, 550, 600, 650, 700 °C) on recovery of smelted zinc. The most favourable conditions in terms of recovery of smelted zinc (88%) were obtained at the temperature of 500 °C and the melting time of 30 min. The influence of the melting time on zinc recovery was obvious only at the temperature of 480 °C, where extension of time led to an increase of zinc recovery.
