Metalurgija (Jan 2020)
Lead and zinc removal from alloy Zn-Ag-Pb under reduced pressure
Abstract
The presented work shows the results of vacuum melting of industrial Zn-Ag-Pb alloy arising from the processing of silver-bearing foam. The tests were carried out in an induction vacuum aggregate in the temperature range 773 - 873 K and pressure 10 - 1 000 Pa. Based on the results obtained, the values of the density of the evaporating stream of zinc and lead were estimated, which were at the level from 3,95×10-4 to 9,53×10-4 gZncm-2 s-1 and from 5,39×10-5 to 30,9×10-5 gPbcm-2 s-1 . In addition, silver losses were estimated in the analysed process. The maximum degree of dezincification of the alloy achieved for the assumed temperature and pressure was 99 %.
