Fuming of Zinc from Lead Blast Furnace Slag

Experimental study of phase equilibria in the “FeO”-ZnO-(CaO + SiO2) system with the CaO/SiO2 weight ratio of 0.71 at metallic iron saturation

“…Better results (easier to control The slag sample during equilibration increases its FeO content by 1 mole for each mole of ZnO lost, according to and predict, and longer equilibration times), however, were achieved with the Fe-free master slags. the overall Reaction [1], provided no oxygen is gained by the sample from the outer atmosphere. It is clear that the…”

“…[21][22][23][24][28][29][30][31][32][33] During equilibration of a to ensure that the condensed phase is at iron saturation, there mixture of ZnO-CaO-SiO 2 slag and metallic iron powder, must always be metallic iron left in the sample in contact the following reaction takes place: with the slag system. Since these conditions cannot be readily predicted, and extensive series of experiments had to be Fe (solid, powder) ϩ ZnO (slag) → Zn (gas) ϩ FeO (slag) [1] undertaken to find the appropriate conditions for each sample composition and each temperature. The changes of sample The zinc metal leaves the condensed system as a vapor, and iron enters the slag as oxide.…”

“…Most of the previous blages in the samples were examined by X-ray powder difexperimental studies were focused on measurements of the fraction analysis (XRD) and optical metallography after the zinc oxide activities in the liquid ZnO-SiO 2 -CaO-FeO-Fe 2 O 3 experiments. Lenz [26] and Lenz and Lee [27] also used DTA slags, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] as this information is directly related to Zn to characterize the liquidus surface and solidus reactions for fuming. Grimsey et al [19] reviewed previous experimental compositions close to those encountered in lead blast-furdata available on the activities of zinc oxide in the silicate nace slag.…”

“…The oxide powders CaO, ZnO, SiO 2 , and Fe 2 O 3 and Fe metal of 99.5ϩ wt pct purity (Ϫ100 m) were used as CaO/SiO 2 ratio of the bulk composition does not change as the result of Reaction [1], and this can be used to advantage. starting materials.…”

“…Grimsey et al [19] reviewed previous experimental compositions close to those encountered in lead blast-furdata available on the activities of zinc oxide in the silicate nace slag. A stagnant N 2 /CO/CO 2 gas mixture was used over slags [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and resolved significant discrepancies between the slag sample. Although the bulk compositions of the ZnOvarious sources.…”