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Why is lead sinter broken into lumps before entering a blast furnace?
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lead processing
A zinc-lead blast furnace and lead-splash condenser. This technology is utilized mainly for producing zinc while managing both lead and zinc from raw materials, a technique that was highly influential in 20th-century smelting.
Lead sinter is broken into lumps before entering a blast furnace primarily to ensure the material remains within the furnace during the smelting process.
During the roasting phase, fine flotation products are agglomerated into a brittle, fused product called sinter. If this material were left in its fine, powdery state, the high-velocity air blasts used in the furnace would blow the particles out of the shaft, leading to significant material loss and inefficiency. By breaking the sinter into appropriately sized lumps, metallurgists ensure that the charge descends through the furnace regularly and maintains proper contact with the rising gases, which is essential for the efficient reduction of metallic oxides into molten metal.12