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The extractive metallurgy of zinc by Roderick J Sinclair; Australasian Institute of Mining and

By Roderick J Sinclair; Australasian Institute of Mining and Metallurgy.; Knovel (Firm)

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Variations are possible by raising air supply and accepting lower strength SO2 in roaster gas, or by oxygen enrichment of the fluidising air, thus lowering gas velocities for the same oxygen supply. As an indicator of the suitability of bed material for control purposes, an index is often used such as the mass ratio of particles within the optimum 100 to 1000 micron size range to those greater than 1000 microns. The aim is to maintain that ratio as high as possible, and by experience for particular concentrates the tolerable minimum level of that ratio can be determined.

Except for those plants processing low iron concentrates, it was not until the development of the jarosite and goethite processes in the late 1960s that the average electrolytic process lifted zinc extraction to 95 per cent or above. However, the terms remain unchanged with a The Extractive Metallurgy of Zinc Spectrum Series Volume 13 25 basic metal payment of 85 per cent of the zinc content, but with a qualifying minimum free metal allowance of eight units in the original concentrate. Hence the metal payment may be expressed as payment for the zinc content less eight percentage units or 85 per cent of the contained zinc, whichever is the lesser.

The typical furnace size was six metre shell diameter with combustion chambers five to eight metres high. 5 for larger units. Concentrates were ground to 95 per cent minus 325 mesh, requiring a significant power input. Although the flash roaster had significantly greater capacity than the hearth roaster, it retained many of the mechanical features, which incurred high maintenance costs. The labour requirements to attend to much of the ancillary equipment were also high and from a cost viewpoint this equipment was rapidly replaced by the development of fluid bed roasting.

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