Conclusion
In this process, the concentrate is directly smelted in the flash furnace reaction shaft, and very high grade lead concentrates can be used without dilution by return slag, etc. The only fluxes needed are those required to make a suitable slag composition with the gangue of the concentrate. This means a much smaller slag fall than found in conventional lead smelting operations and thus lower lead losses in the slag.
If the concentrate contains some zinc, it is possible to recover this zinc from the slag tapped from the separating furnace by means of normal slag fuming.
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References
US Patent #2,506,557: Canadian Patent #451,735.
Petri Bryk, John Ryselin, Jorma Honkasalo, and Rolf Malmström: Journal of Metals, 1958, vol. 10, no. 6, pp. 395–400.
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Belgian Patent #641,244; Spanish Patent #294,441; Rhodesian Patent #699/1963; W. German Patent #1,179,004.
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Bryk, P., Malmstrom, R. & Nyholm, E. Flash smelting of lead concentrates. JOM 18, 1298–1302 (1966). https://doi.org/10.1007/BF03378517
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DOI: https://doi.org/10.1007/BF03378517