The Roasting of Molybdenum
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- Category: Molybdenum knowledge
- Published on 30 August 2013
- Written by 陈桂兰
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The roasting process converts molybdenite concentrate into technical molybdic oxide by the following chemical reactions: These take place at 600-700oC in large multihearth furnaces or "roasters". Sulphide concentrate is rabbled from the centre to the periphery of one hearth where it drops to the hearth below and is rabbled back to the centre. It reacts continuously with a steady supply of forced air during the 10 hours it takes to complete the circuit across a dozen or more hearths. The resulting technical grade molybdic oxide typically contains a minimum of 57% molybdenum, and less than 0. 1% sulphur. Desulphurisation systems remove sulphur dioxide from the effluent roaster gases. Some of the by-product molybdenite concentrates from copper mines contain small quantities (<0.10%) of rhenium, a metallic element used in catalysts for the production of unleaded gasoline and in advanced superalloys for turbine blades of the latest jet engines. Molybdenum roasters equipped to recover rhenium are one of the principal commercial sources for this rare metal.
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