High purity molybdenum concentrate ntau lawm txoj kev

Flotation molybdenum concentrates los ntawm tooj liab-molybdenum ua cov nroj tsuag feem ntau muaj ntau tshaj 0.5% tooj liab, thiab cov hmoov txhuas thiab calcium oxide feem ntau tshaj tus qauv. Molybdenum ua cov nroj tsuag tso tawm flotation molybdenum mloog zoo uas muaj impurities, qee zaum kuj nyuaj kom ua tau raws li cov qauv zoo.

Txhawm rau tsim cov khoom zoo siab-purity molybdenum concentrate, cov txheej txheem ntau lawm yog raws li hauv qab no.

I. Ua kom muaj txiaj ntsig zoo

Canadian Endeco tau txais ob yam khoom hauv kev xaiv: zoo molybdenum concentrate muaj 56.88% molybdenum thiab zoo tib yam molybdenum concentrate muaj 51% molybdenum. Beijing Tianhe Chemical Plant txais yuav flotation kem rau molybdenum mloog zoo kom ua tiav xya-theem qhib-circuit flotation, thiab thaum tau txais zoo molybdenum concentrate (muaj 97% MoS, molybdenum rov qab tus nqi ntawm 37%), ib feem ntawm molybdenum intermediate ore yog kuj tsim. El Salvador siv cuaj-theem concentration los cais cov molybdenum zoo siab (97% MoS2 thiab 65% molybdenum rov qab) los ntawm cov pa molybdenum concentrate, thaum tseem ua ib feem ntawm cov molybdenum zoo tib yam. Siv TL chemicals los txhim kho flotation, los ntawm molybdenum concentrate uas muaj 47% molybdenum, ua kom zoo molybdenum concentrate muaj 57% ~ 58% molybdenum, molybdenum rov zoo dua los yog sib npaug rau 97%, thaum tseem ua ib feem me me ntawm molybdenum hauv nruab nrab ntawm cov ore (Mo Less tshaj los yog sib npaug rau 2%).

Hydrochloric acid leaching

Hydrochloric acid leaching tuaj yeem siv tau thaum lub flotation concentrate muaj CaO thiab PbS siab. Feem ntau cov calcium uas muaj cov zaub mov rau calcite (CaCO3), tom qab ntawd fluorite (CaF2). Lawv tsis ntab yooj yim los ntawm lawv tus kheej thiab feem ntau mus rau hauv molybdenum tailings. Txawm li cas los xij, lub cev hyphenated, paug los ntawm cov roj thiab tshuaj lossis cov khoom siv kho tshuab thiab lwm yam laj thawj, feem ntau me me ntawm molybdenum concentrate, yog li ntawd nws cov ntsiab lus CaO tshaj tus qauv.

III. Chlorine ntsev leaching

Chlorine leaching yog siv cov oxidation siab ntawm FeCl3 los yog CuCl2 oxidation ntawm chalcopyrite los yog galena:

CuFeS2+4FeCl3=CuCl2+5FeCl2+2S

PbS+2FeCl3=PbCl2+2FeCl2+S

Fe3+ ions oxidize cov sulfide thiab precipitate S ntawm tus qauv peev xwm Eo(V) ntawm:

Sulfide FeS ZnS CuFeS2 FeS2 Cu2S CuS

E0(V) 0.06 0.264 0.264 0.42 0.56 0.59

Qhov tseeb, qhov kev txiav txim ntawm qhov nyuaj ntawm leaching sulfide minerals yog: magnetite pyrite < chalcopyrite < galena < sphalerite < chalcopyrite < pyrite . Ntxiv rau ferric chloride lossis tooj liab chloride hauv cov tshuaj leaching, feem ntau yuav tsum tau ntxiv cov tshuaj chloride ntsev ntawm alkali hlau (xws li NaCl) los yog alkaline ntiaj teb hlau chloride ntsev (xws li CaCl2), uas tsis tsuas yog nce lub boiling point. cov tshuaj leaching, kom cov leaching tuaj yeem nqa tawm ntawm qhov kub ntawm 100 ~ 110 degree; tab sis kuj muab ntau cov Cl-ions rau PbCl2, CuCl, kom insoluble PbCl2, CuCl los tsim cov soluble complex ions rau hauv cov kua theem, Cu, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb, Pb thiab PbCl. Ua kua theem, Cu, Pb leaching tuaj yeem pom tau:

PbCl2+Cl-→ PbCl3-

CuCl + Cl- → CuCl 2-

HCI kuj tseem ntxiv rau cov kua qaub kom tswj tau qee qhov acidity. Chlorinated leaching ntawm molybdenum concentrate tau ntev tau siv nyob rau hauv Brenda, nyob rau hauv ntau lawm. Cov txheej txheem kuj tseem hu ua Brenda txoj kev. Brenda tooj liab-molybdenum mine yog lub ntiaj teb qib qis tooj liab-molybdenum cog, cov ore raw muaj 0.183% tooj liab thiab 0.049% molybdenum. Cov ntxhia tooj liab hauv cov ore feem ntau yog chalcopyrite. Lub flotation molybdenum concentrate ntawm Brenda nruab nrab yog 54.97% molybdenum, 0.32% tooj liab thiab 0.38% txhuas (1974). Obviously cov tooj liab thiab txhuas cov ntsiab lus yog siab, nyob rau hauv 1974 Brenda ua cog tau txais lub Noranda lub tuam txhab kev tshawb fawb chaw tshawb fawb ntawm cov tshuaj chlorine ntsev leaching txheej txheem, cov molybdenum concentrate qib nce mus rau 55.89% Mo, 0.054% Cu, 0.033%. Pb. Nws cov khoom zoo thaum lub sijhawm ntawd tsis tshua muaj nyob hauv ntiaj teb. Cov mis leaching tov yog feem ntau: CuCl2 1%, FeCl3 10%, CaCl2 (los yog NaC1) 30%, HCl 10%. Leaching yog nqa tawm nyob rau hauv atmospheric siab thiab kub, thiab leaching kub feem ntau yog tswj ntawm 100 ~ 110 degree. Lub leaching yog ua haujlwm tsis tu ncua, txhua zaus 2 ~ 3 teev. Tom qab leaching, CuCl2- thiab PbCl{32}} raug cais los ntawm kev pom. Cov lim dej muaj cov tshuaj tiv thaiv CuCl2, PbCl3, FeCl2 ..., thiab tseem muaj cov tshuaj tsis tiav. Feem ntau 30% ntawm cov filtrate raug muab pov tseg kom tsis txhob tsub zuj zuj ntawm Cu, Pb, thiab lwm yam nyob rau hauv cov kua dej leach, thiab cov seem ntawm cov filtrate tau dhau los ntawm cov roj chlorine kom rov tsim FeCl2 rau hauv FeCl3 thiab rov ua dua. Tus nqi leaching yog kwv yees li 9 ~ 11 xees / kg molybdenum, thiab tus nqi muag tau nce 95 xees / kg molybdenum. Brenda cov nyiaj tau los txhua xyoo nce yog kwv yees li US $ 3 lab.