The Processing of Molybdenum Oxide
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- Category: Molybdenum knowledge
- Published on 28 August 2013
- Written by 陈桂兰
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Most of the molybdenum oxide is manufactured by roasting the molybdenite in the air at 560 to 600° C. When the copper content of the molybdenite is high, the copper is removed by acid-leaching oxidized ores after roasting and filtering it. During this process, since a considerable amount of molybdenum is eluted and thus, exists in the extracting solution, it is recovered by solvent extraction or pH control. During the roasting, a large amount of heat is generated by the combustion of molybdenum and sulfur. That is, the oxidation state of the molybdenum in the molybdenite is +4 and the oxidation state thereof in the oxidized ores is +6. Therefore, a larger amount of reducing agent than the molybdenite is needed in order to manufacture the ferromolybdenum from the oxidized ores. In addition, the metallothermic reduction process occurs explosively and completes almost immediately, such that it is difficult to control the reaction and it is impossible to obtain homogeneous products.
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