Molybdenum:

• Yog ib qho tshwm sim tshwm sim nyob rau hauv 1778 los ntawm Carl Wilhelm Scheele, tus kws tshawb fawb Swedish uas kuj pom cov pa oxygen hauv huab cua.
• Muaj ib qho ntawm cov ntsiab lus melting siab tshaj plaws ntawm tag nrho cov ntsiab lus tsis tau nws qhov ceev tsuas yog 25% ntau dua hlau.
• Muaj nyob rau hauv ntau yam ores, tab sis tsuas yog molybdenite (MoS2) yog siv los tsim cov khoom lag luam molybdenum.
• Muaj qhov qis tshaj coefficient ntawm thermal expansion ntawm txhua yam khoom siv engineering.

Nws tuaj qhov twg:

• Cov mines tseem ceeb molybdenum muaj nyob hauv Canada, Tebchaws USA, Mexico, Peru thiab Chile. Nyob rau hauv 2008, lub ore cia puag tag nrho 19,000,000 tonnes (qhov chaw: US Geological Survey). Tuam Tshoj muaj cov peev nyiaj loj tshaj plaws ua raws li Asmeskas thiab Chile.
• Molybdenite tuaj yeem tshwm sim raws li ib qho kev ntxhib los mos hauv lub cev ore, tab sis feem ntau cuam tshuam nrog sulfide minerals ntawm lwm cov hlau, tshwj xeeb tshaj yog tooj liab.

Nws ua li cas:

• Cov mined ore yog crushed, hauv av, tov nrog ib tug kua thiab aerated nyob rau hauv ib tug flotation txheej txheem los cais cov metallic minerals los ntawm lub pob zeb.
• Cov txiaj ntsig tau pom muaj nyob nruab nrab ntawm 85% thiab 92% industrially useable molybdenum disulfide (MoS2). Roasting no nyob rau hauv huab cua ntawm 500 mus rau 650 ° C ua roasted molybdenite concentrate los yog RMC (Mo03), kuj hu ua technical Mo oxide los yog tech oxide. Qee qhov 40 mus rau 50% ntawm molybdenum yog siv rau hauv daim ntawv no, feem ntau yog cov khoom siv hlau hauv cov khoom hlau.
• 30-40% ntawm RMC ntau lawm yog ua tiav rau hauv ferromolybdenum (FeMo) los ntawm kev sib xyaw nrog hlau oxide thiab txo nrog ferrosilicon thiab txhuas hauv cov tshuaj tiv thaiv thermite. Lub resulting ingots yog crushed thiab soj ntsuam los tsim qhov xav tau FeMo particle loj.
• Kwv yees li 20% ntawm RMC tsim tawm thoob ntiaj teb tau ua tiav rau hauv ntau cov khoom siv tshuaj xws li ntshiab molybdic oxide (Mo03) thiab molybdates. Ammonium molybdate tov tuaj yeem hloov mus rau ib tus naj npawb ntawm cov khoom molybdate thiab ua ntxiv los ntawm calcinations ua cov ntshiab molybdenum trioxide.
• Molybdenum hlau yog tsim los ntawm ob-theem hydrogen txo cov txheej txheem los muab cov ntshiab molybdenum hmoov.

Dab tsi yog nws siv rau:

• Kwv yees li 20% ntawm molybdenum tshiab, ua los ntawm mined ore yog siv los ua molybdenum-qib stainless hlau.
• Engineering steels, cuab yeej thiab kev kub ceev hlau, cam khwb cia hlau thiab superalloys sib sau ua ke rau ib qho ntxiv 60% ntawm molybdenum siv.
• Qhov seem 20% yog siv rau hauv cov khoom siv kho dua tshiab xws li roj nplua nyeem qib molybdenum disulfide (MoS2), molybdenum chemical compounds thiab molybdenum hlau.

Cov txiaj ntsig thiab siv cov khoom siv:

Stainless hlau

• Molybdenum txhim kho corrosion kuj thiab kub siab zog ntawm tag nrho cov stainless hlau. Nws muaj qhov tshwj xeeb muaj txiaj ntsig zoo ntawm pitting thiab crevice corrosion kuj nyob rau hauv cov tshuaj chloride-muaj cov kev daws teeb meem, ua rau nws tseem ceeb hauv tshuaj thiab lwm yam kev siv.
• Molybdenum-muaj stainless hlau yog tshwj xeeb resistant rau corrosion thiab feem ntau siv nyob rau hauv architecture, tsev thiab kev tsim kho, muab zoo tsim yooj yooj yim thiab ntev tsim lub neej.
• Ntau yam ntawm cov khoom yog tsim los ntawm molybdenum-muaj stainless hlau kom muaj kev tiv thaiv corrosion, nrog rau cov khoom siv hauv tsev, ru tsev, kab hlau rhuav phab ntsa, tes tuav, pas dej da dej, qhov rooj, lub teeb fittings thiab sunscreens.

Superalloys

Cov no suav nrog corrosion resistant alloys thiab kub kub alloys:

• Corrosion resistant npib tsib xee-raws li alloys uas muaj molybdenum yog siv nyob rau hauv daim ntawv thov raug heev corrosive ib puag ncig nyob rau hauv ib tug ntau yam ntawm cov txheej txheem industries thiab daim ntaub ntawv, nrog rau cov flue gas desulfurization units siv los tshem tawm sulfur los ntawm lub hwj chim chaw nres tsheb emissions.
• Cov kub kub alloys yog cov kev daws teeb meem muaj zog, uas muab kev tiv thaiv rau kev puas tsuaj los ntawm kev kub siab creep, los yog muaj hnub nyoog-hardenable, uas muab lub zog ntxiv yam tsis muaj kev txo qis ductility thiab zoo heev los txo cov coefficient ntawm thermal expansion.

Cov hlau alloy

• Tsuas yog ib qho me me ntawm molybdenum txhim kho hardenability, txo temper embrittlement thiab boosts tiv thaiv hydrogen nres thiab sulfide kev nyuaj siab tawg.
• Cov molybdenum ntxiv kuj ua rau kom qhov kub thiab txias zog thiab txhim kho weldability, tshwj xeeb tshaj yog nyob rau hauv siab zog low alloy (HSLA) steels. Cov hlau ua haujlwm siab no tau siv ntau yam kev siv, los ntawm cov tsheb sib zog mus rau kev txhim kho kev ua haujlwm zoo hauv cov tsev, cov kav dej thiab cov txuas hniav, txuag ob qho tib si ntawm cov hlau uas xav tau thiab lub zog thiab emissions cuam tshuam nrog nws cov khoom tsim, kev thauj mus los thiab kev tsim khoom.

Lwm yam kev siv

Cov piv txwv tshwj xeeb ntawm kev siv molybdenum suav nrog:

• Molybdenum-raws li alloys, uas muaj lub zog zoo heev thiab kev ruaj ntseg ntawm qhov kub siab (txog 1900 ° C) hauv qhov chaw tsis muaj oxidizing lossis lub tshuab nqus tsev. Lawv cov ductility siab thiab toughness muab kev kam rau siab dua rau qhov tsis zoo thiab tawg tawg dua li ceramics.
• Molybdenum-tungsten alloys, tau sau tseg rau tshwj xeeb tsis kam rau molten zinc
• Molybdenum-25% rhenium alloys, siv rau lub foob pob hluav taws lub cav thiab cov khoom siv hluav taws xob ua kua hlau uas yuav tsum tau ua rau hauv chav tsev kub.
• Molybdenum clad nrog tooj liab, ua kom qis expansion, siab conductivity hluav taws xob Circuit Court boards
• Molybdenum oxide, siv nyob rau hauv zus tau tej cov catalysts rau petrochemical thiab tshuaj industries, dav deployed nyob rau hauv lub refining ntawm crude roj los txo cov leej faj cov ntsiab lus ntawm refined khoom.
• Cov khoom siv tshuaj molybdenum siv nyob rau hauv polymer compounding, corrosion inhibitors thiab high-performance lubricant formulations