Yiyọ Molybdenum lati Molybdenite - Asiwaju isokuso ti o Mu Irin lagbara

Molybdenum (Mo, ano 42) jẹ idamu pẹlu asiwaju ati lẹẹdi fun awọn ọgọrun ọdun. Ore akọkọ rẹ, molybdenite (MoS₂), jẹ asọ, grẹy, erupẹ isokuso ti o dabi ati rilara ti o fẹrẹ jọra si graphite - mejeeji fi awọn ami dudu silẹ lori iwe, mejeeji ni rilara greasy, ati pe mejeeji waye bi awọn flakes grẹy grẹy. Orukọ naamolybdenumwa lati Girikimolybdos('asiwaju'), ti o ṣe afihan iporuru atijọ yii. Carl Wilhelm Scheele ni o kọkọ ṣe iyatọ molybdenite lati graphite ni ọdun 1778 nipa ṣiṣe itọju rẹ pẹlu acid nitric ati wiwo residite funfun kan (molybdic acid, H₂MoO₄) ti graphite ko gbejade.

Peter Jacob Hjelm, ṣiṣẹ ni imọran Schele's ni imọran motolybdic acid akọkọ 178bdic pẹlu erogba. Irin naa jẹ alaimọ (ti doti pẹlu molybdenum carbide ati oxide), ati pe nitootọ molybdenum mimọ ko ṣejade titi di ọdun 1893 nigbati Henri Moissan lo ileru ina.

Molybdenite (MoS₂) ni 60% molybdenum nipasẹ ọpọ eniyan. O ni o ni a siwa gara be aami ni opo to graphite - sheets ti molybdenum awọn ọta sandwiched laarin awọn sheets ti sulfur awọn ọta, pẹlu lagbara van der Waals ologun laarin awọn fẹlẹfẹlẹ. Eyi ṣe alaye isokuso rẹ ati lilo rẹ bi lubricant to lagbara ( girisi disulfide molybdenum). Iyọkuro naa pẹlu sisun si molybdenum trioxide (MoO₃) ti o tẹle pẹlu idinku erogba.

HAZARD:Roasting molybdenite nmu sulfur dioxide (SO₂), majele kan, gaasi gbigbọn. Molybdenum trioxide (MoO₃) eruku n binu si awọn membran mucous ati pe o fa ipo kan ti a npe ni molybdenosis ni jijẹ ẹran-ọsin lori awọn ile ọlọrọ molybdenum. Lo aabo atẹgun jakejado. Ṣiṣẹ ni ita nigba sisun.