Process of dezincifying a material flow when operating a...

Details Process of dezincifying a material flow when operating a... Process of dezincifying a material flow when operating a...

C - Chemistry, Metallurgy

21

B

53/27, 53/322

C21B 13/14 (2006.01)

Patent

CA 1335041

Disclosed is a process of dezincifying the flow of material during the operation of a plant for the production of pig iron including a direct reduction shaft furnace and a meltdown gasifier. A crude reducing gas drawn off the meltdown gasifier is dedusted in two steps. In the first step, zinc-poor coal dust is separated in a cyclone operated at a higher temperature, which is recycled into the meltdown gasifier. In the second step, upon cooling of the gas leaving the first cyclone, solid particles enriched with zinc are separated at a lower temperature. The dezincified reducing gas is fed to the direct reduction shaft furnace and the zinc-rich substances separated off the second cyclone are processed to a zinc concentrate.

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