The invention relates to non-
ferrous metal metallurgy technology, in particular to the
pyrometallurgy technology of
lead sulfide concentrate. The process method is to successively carry out three
smelting processes of oxidation
smelting, reduction
smelting and fuming volatilization in the same metallurgical furnace to smelt
lead sulfide concentrate, and smelt crude lead,
zinc fume and discardable
slag in one step. In the oxidation smelting stage, after the feed reaches the set amount, the
lead oxide slag is not released, and the high-temperature
liquid slag is directly used in the furnace to transfer to the reduction stage of the
lead oxide slag, and the
smoke generated by oxidation smelting and reduction smelting is returned to the furnace for smelting. After the reduction is completed, all the crude lead is released, and the high-temperature
liquid slag remains in the furnace, and it enters the slag fuming stage, and the
zinc fume dust from the slag fuming is recovered and enters the next smelting cycle. The heat of the slag in the invention is fully utilized, and the energy-saving effect is obvious. The
raw material preparation of the method is simple, the
reducing agent only needs ordinary
anthracite, and part of the fuel that needs to be supplemented in the reducing section and the fuming section is pulverized
coal, which is low in value and easy to obtain.