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2. Multiple hearth furnace - Wikipedia

   en.wikipedia.org/wiki/Multiple_hearth_furnace

   The multiple hearth furnaces consist of several circular hearths or kilns superimposed on each other. Material is fed from the top and is moved by the action of rotating "rabble arms", and the revolving mechanical rabbles attached to the arms move over the surface of each hearth to continuously shift the ore.

3. Zinc smelting - Wikipedia

   en.wikipedia.org/wiki/Zinc_smelting

   Additional grinding, beyond that required for a multiple hearth furnace, is normally required to ensure that heat transfer to the material is sufficiently rapid for the desulfurization and oxidation reactions to occur in the furnace chamber. Suspension roasters are unpressurized and operate at about 980 °C (1,800 °F). [1]

4. Calcination - Wikipedia

   en.wikipedia.org/wiki/Calcination

   Calcination is carried out in furnaces or reactors (sometimes referred to as kilns or calciners) of various designs including shaft furnaces, rotary kilns, multiple hearth furnaces, and fluidized bed reactors. Examples of calcination processes include the following:

5. Open-hearth furnace - Wikipedia

   en.wikipedia.org/wiki/Open-hearth_furnace

   Open hearth furnace workers at the Zaporizhstal steel mill in Ukraine taking a steel sample, c. 2012 Tapping open-hearth furnace, VEB Rohrkombinat Riesa, East Germany, 1982. An open-hearth furnace or open hearth furnace is any of several kinds of industrial furnace in which excess carbon and other impurities are burnt out of pig iron to produce ...

6. Thompson Creek Metals - Wikipedia

   en.wikipedia.org/wiki/Thompson_Creek_Metals

   Four multiple-hearth furnaces are used for the conversion (roasting) of molybdenum disulfide concentrates into technical grade molybdenum oxide (tech oxide), which is sold in powder form or briquettes or converted into pure molybdenum oxide or ferromolybdenum. Two other furnaces process spent catalyst material containing other metals. [14]

7. New Zealand Steel - Wikipedia

   en.wikipedia.org/wiki/New_Zealand_Steel

   Glenbrook's iron plant contains four multiple hearth furnaces, [9] four rotary kilns, and two melters. The kilns directly reduce the ore to metallic iron. This process is unusual as most mills use blast furnaces for the reduction process. In the steelmaking plant, vanadium recovery and removal is done due to the high vanadium content of the ...