A clean melting method for lead-containing waste
slag is disclosed. The method includes 1) curing and converting, 2) curing and hardening and 3) melting. The method includes firstly mixing the lead-containing waste
slag with
calcium oxide, curing, converting, fully mixing with
iron powder, shaping, making a
brick, curing and hardening the
brick, then sending the
brick into a
blast furnace, and performing reduction melting to recover lead and iron-
sulfur, thus achieving clean melting. The method significantly improves compactness, strength and
temperature resistance of the shaped brick, reduces thermo-collapse and
pyrolysis powdering of the shaped brick in a melting process, reduces furnace accretion and dust, and increases the direct
recovery rate of lead melting in the
blast furnace and the
hearth melting period. The method is simple in operation, low in adding amounts of
sulfur fixing agents, adhesives, and the like, environmental friendly, high in
metal recovery rate and heat utilization efficiency, low in
impurity content, low in production
energy consumption, and suitable for large-scale industrial production.