FIELD: metallurgy; purification of wastes of hot-dip galvanizing of steel strips (zinc dross) from oxides of foreign metals for production of zinc which may be used for hot-dip galvanizing of steel strips, production of dry zinc white and different zinc-based alloys.
SUBSTANCE: proposed method includes loading zinc into cages in sodium tetraborate melt containing 3-7 mass-% of boric acid anhydride at temperature of 750-800°C. Furnace used for purification of zinc is provided with pot for melt for avoidance of pouring of sodium tetraborate melt. Said pot is provided with branch pipe for pouring purified zinc melt into ingot molds. Proposed method may be performed in continuous mode. Production of zinc is increased not below 99.55%.
EFFECT: avoidance of secondary zinc-containing waste and formation of skull on furnace crucible walls.
5 cl, 1 dwg, 2 tbl, 1 ex
