Hydrogen txo txoj kev ntawm -iron oxide
High-purity micronized -Fe2O3 yog loaded rau hauv lub tais, thiab cov hmoov txheej yuav tsum tsis txhob tuab heev. Tom qab muab lub disk tso rau hauv cov tshuaj tiv thaiv tube, high-purity nitrogen tau dhau los ua kom tag nrho cov huab cua hloov. Tom qab ntawd hydrogen gas saturated nrog dej maj mam muab los ntawm lub raj mis ntxuav roj. Qhov cua sov ntawm 300-400 degree (xws li 330 degree) yog qhov tsim nyog. Tom qab cov tshuaj tiv thaiv tau lees paub (feem ntau 1 ~ 3h) thiab txias, cov hydrogen nres thiab cov qauv raug tshem tawm tom qab hloov nrog nitrogen. Cov dej vapor tsis txaus, qhov kub thiab txias siab dhau los yog txo qis heev yuav tsim FeO, yog li yuav tsum tau saib xyuas. Cov dej vapor tuaj yeem nce ntxiv los ntawm kev ua kom kub ntawm lub raj mis ntxuav roj (40-60 degree yog qhov tsim nyog). Koob-puab-FeO (OH) raws li cov khoom pib yog rhuab thiab lub cev qhuav dej kom tau -Fe2O3. -Fe2O3 tuaj yeem siv los tsim cov koob zoo li ferric tetroxide hais. Daim kab xev dub yog siv los ua daim kab xev kaw rau hom ferric tetroxide.
Txoj kev ntxiv
Ferrous sulfate yog tsim los ntawm reacting hlau filings nrog sulfuric acid, thiab ces ntxiv caustic soda thiab hlau oxide ntawm 95-105 degree rau ib tug ntxiv cov tshuaj tiv thaiv los tsim cov ferric oxide, uas yog lim, qhuav thiab crushed los tsim ferric oxide dub.
Slow oxidation txoj kev ntawm ferrous hydroxide
Cov tshuaj aqueous uas muaj ferrous hydroxide precipitate yog rhuab saum 7 0 degree thiab qeeb oxidation yog nqa tawm kom tau ferric oxide hmoov uas muaj xws li ib tug zoo xws li ortho-octahedral los yog cubic ib tug crystal particles nrog ib tug prism ntev li ntawm 0.2 μm. Cov npuas cua kuj tuaj yeem thauj tau los ua ib qho kev oxidation. Oxidizing agents xws li KNO3 tuaj yeem siv tau.
Txoj kev Harber
Txoj kev Harber ntxiv 220g ntawm 20 feem pua ammonia rau 2.2L ntawm FeSO4-7H2O aqueous tov, boils nyob rau hauv kev txiav tawm (koj muaj peev xwm siv ib puag ncig-hauv qab khob nruab nrog ib tug capillary raj), thiab ntxiv ib tug concentrated. aqueous tov uas muaj 25.5g ntawm KNO3 mus rau boiling, thiab yog hais tias koj txawj, koj muaj peev xwm tau txais ib tug chemically xam muaj pes tsawg leeg ntawm Fe3.00O4.00 ntawm ferric tetroxide.
Alkali add method
Kev daws ntawm ferrous sulfate yog oxidized los ntawm kev ntxiv alkali los yog kev daws ntawm hlau ntsev thiab ferrous ntsev yog tov nyob rau hauv ib qho piv txwv thiab precipitated los ntawm kev ntxiv alkali.
