Multiple Hearth Roasting of Sulphides tn the Zinc Roasting Plant of the Hudson Bay Mining and Smelting

AT THE Flin Flon plant of the Hudson Bay Mining and Smelting Co., Limited there are two types of multiple hearth furnaces used in the roasting of sulphides. This paper will deal primarily with the wedge-type furnace in the roasting of zinc concentrates. The other furnace, the Nichols-Herroshoff type, is used in the copper smelter and is described in the papers given by (1) J. H. Ambrose in 1935 and (2) R. E. Mast and G. H. Kent in 1954. The design and operation of these roasting furnaces at the present time is essentially the same as given in the write-up in 1954. No attempt will be made here to describe these furnaces, except to mention that there are five Nichols-Herreshoff multiple-hearth furnaces, four of which are used to roast a dried mixture of copper concentrate, zinc plant residue, and flux, before this material is fed to the reverberatory furnace.
Keywords: bucket elevator, hearths, Hudson Bay Mining and Smelting, reverberatory furnace, Zinc Plant, Concentrate, Concentrates, Furnaces, Plants, Roasters, Roasting, Roasting plants, Temperature, zinc
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