Chromite yog ib yam khoom tseem ceeb rau smelting ferroalloys, stainless hlau thiab muaj nuj nqis alloys. Kev lag luam metallurgical siv li ntawm 60% ntawm chromium, uas yog siv los tsim cov hlau alloy, tshwj xeeb tshaj yog stainless hlau. Tib lub sijhawm, chromite kuj tau siv dav hauv kev lag luam refractory, tshuaj lom neeg kev lag luam thiab kev lag luam teeb.
Ore khoom
Muaj ntau tshaj li tsib caug hom chromium-muaj cov minerals pom nyob rau hauv cov xwm, tab sis tsuas yog chromium-muaj cov zaub mov uas muaj nqi yog chromite, uas yog spinel (MgO, Al2O3), magnesia chromite (MgO, Cr2O3), thiab magnetite. (FeO, Fe2O3) thiab lwm yam kev daws teeb meem. Raws li txoj cai, cov tshuaj formula ntawm chromite yog FeO, Cr2O3, muaj 68% Cr2O3, 32% FeO, nruab nrab magnetic, ceev 4.1 ~ 4.7g / cm3, Mohs hardness 5.5 ~ 6.5, thiab cov tsos ntawm cov xim ntawm dub mus rau tsaus xim av. Gangue minerals feem ntau suav nrog olivine, serpentine thiab pyroxene, qee zaum nrog me me ntawm vanadium, nickel, cobalt thiab molybdenum pawg.
Kev Siv Tshuab
Tuam Tshoj cov khoom siv chromite kuj tsis zoo, feem ntau yog nyob hauv Tibet, Xinjiang, Inner Mongolia, Gansu thiab lwm lub xeev. Cov peev txheej chromite txawv teb chaws feem ntau yog muab faib rau hauv South Africa, Russia, Brazil, Tebchaws Asmeskas thiab lwm lub tebchaws. Chromite muaj cov yam ntxwv ntawm siab ceev, nruab nrab magnetism thiab coarse siv lead ua hais. Feem ntau, nws yog cais los ntawm ore ntxuav, tsis muaj zog sib nqus sib cais, nruab nrab muaj zog sib nqus sib cais, lub ntiajteb txawj nqus sib cais, flotation thiab lwm yam txheej txheem.
Kev ntxuav
Nws yog tsim rau coarse-grained chromite ore nrog qib siab ntawm cov ore raw thiab feem ntau av nplaum zoo li av nkos raws li impurities. Cov khoom tsim nyog coarse concentrate tuaj yeem xaiv los ntawm kev ntxuav yooj yim.
Sib nqus sib cais
Chromite muaj cov khoom sib nqus nruab nrab thiab tuaj yeem sib cais los ntawm qhuav lossis ntub dej sib nqus sib nqus. Cov khoom sib nqus sib nqus yog thawj zaug sib cais los ntawm cov hlau nplaum tsis muaj zog, thiab tom qab ntawd sib nqus sib nqus los ntawm CXJ lossis CFLJ, phaj sib nqus sib nqus cais, ntsug nplhaib siab gradient sib nqus sib nqus cais, thiab lwm yam. Cov khoom siv ua kom qhuav thiab ntub dej, thiab tuaj yeem xaiv cov khoom tsim nyog concentrate. Txoj kev sib nqus sib nqus muaj qhov zoo ntawm kev ua haujlwm loj thiab cov ntsuas ntsuas ruaj khov.
South Africa chromite thov site
Heavy media sorting
Qhov tshwj xeeb lub ntiajteb txawj nqus ntawm chromite yog 4.1 ~ 4.7g / cm3, thiab qhov tshwj xeeb lub ntiajteb txawj nqus ntawm cov gangue thiab hlau silicate minerals feem ntau yog 2.7 ~ 3.2g / cm3. Ua kom zoo dua qhov sib txawv ntawm qhov ntom ntom ntawm cov ntxhia, kauv chute, jigging, co rooj, kauv beneficiation yuav siv tau tshuab, centrifuges thiab lwm yam hnyav sorting khoom rau sorting. Txoj kev no yog tsim rau chromite nrog coarser siv lead ua grain loj, thiab cov khoom zoo tau yooj yim ploj hauv cov tailings.
Flotation
Chromite tuaj yeem siv fatty acid lossis amine collectors los xaiv cov khoom tsim nyog los ntawm cov txheej txheem roughing thiab cheb nyob rau hauv qhov tsim nyog pH. Nws yog haum rau nplua-grained thiab nplua-grained chromites.
Tshuaj muaj txiaj ntsig
Rau qee qhov chrome ores uas nyuaj rau kev ua tiav los ntawm cov txheej txheem kev siv tshuab, cov txiaj ntsig tau txais txiaj ntsig - cov txheej txheem tshuaj ua ke lossis ib txoj kev siv tshuaj ib leeg tau txais yuav. Kev siv tshuaj lom neeg muaj xws li: xaiv leaching, redox, fuse cais, sulfuric acid thiab chromic acid leaching, txo thiab sulfuric acid leaching, thiab lwm yam.
Piv txwv kev pab
Qib ntawm Cr2O3 muaj nyob rau hauv qee yam chromite tailing hauv South Africa yog 24.80%. Nws yog nyob rau ntawm qhov chaw chute rov xaiv tailings. Cov qauv loj yog -40 mesh thiab qhov loj me me yog qhov sib xws. Cov chromite muaj nyob rau hauv cov khoom zoo thiab cov khoom sib txuas thiab cov koom ua ke. Lub ntsiab gangue minerals Nws yog olivine thiab pyroxene, nrog ib tug me me ntawm nplua av nkos. Raws li qhov xwm txheej ntawm cov qauv ore, cov txheej txheem tau txais txiaj ntsig yog tsim los ua ib lub nplhaib los yog ntsug ib-kauj ruam roughing.
Cov nplua-grained chromite muaj nyob rau hauv cov tailings ntawm on-site chute lub ntiajteb txawj nqus sib cais txais ib tug ca phaj los yog ntsug nplhaib muaj zog sib nqus sib cais txheej txheem, uas muaj peev xwm xaiv cov tsim nyog concentrate cov khoom. Cov zaub mov uas muaj chromium nyob rau hauv cov hlau nplaum yog cov nplua-grained inclusions lossis lwm yam tsis muaj nuj nqis chromium-muaj cov zaub mov tau ua tiav cov txiaj ntsig zoo.
Post lub sij hawm: Oct-12-2021