Zinc dross feem ntau yog cov khoom ntawm cov tshuaj tiv thaiv ntawm zinc thiab hlau, thiab nws muaj pes tsawg leeg yog feem ntau yog ζ-theem ntawm hlau-zinc alloy txheej tsim tom qab kev sib xyaw ntawm zinc thiab hlau. Yog li, cov ntsiab lus hlau nyob rau hauv zinc dross feem ntau yog nyob ib ncig ntawm 3-6%, thiab cov ntsiab lus zinc yog nyob ib ncig ntawm 94-97%. Hauv qee cov txheej txheem kub-dip galvanizing, txhuas yog ntxiv los tiv thaiv lub lauj kaub galvanizing. Nyob rau hauv tas li ntawd, zinc dross muaj 1.5-2% lead. Qee lub sij hawm, aluminium kuj tseem ntxiv los txhim kho qhov chaw tiav thiab cov yam ntxwv ntawm cov txheej txheem galvanized, yog li tseem yuav muaj qee cov ntsiab lus txhuas hauv zinc dross.
Cov hlau hauv zinc dross feem ntau yog los ntawm cov ntsev hlau txuas rau saum npoo ntawm cov kav hlau steel thaum lub sij hawm ua ntej, thiab los ntawm cov kav hlau hlau lawv tus kheej, lub lauj kaub galvanizing, thiab cov khoom siv galvanizing. Tom qab dissolution los ntawm zinc kua thiab kev sib nrig sib diffusion ntawm hlau thiab zinc atoms, ib tug hlau-zinc alloy txheej yog tsim, nrog lub crystalline ζ-theem txheej (drifting txheej) detaching los ntawm cov hlau substrate thiab accumulating nyob rau hauv qab ntawm lub lauj kaub galvanizing. Qhov no maj mam sib sau ua ib txheej zinc dross.
Cov tshuaj tiv thaiv thaum tsim cov zinc dross yog:
Cov tshuaj tiv thaiv los ntawm cov ntsev hlau:
FeCl₂+8Zn→ZnCl₂+FeZn₇
FeCl₂+14Zn→ZnCl₂+FeZn13
Cov tshuaj tiv thaiv los ntawm steel:
Fe3C+21Zn →3FeZn13+C
Fe3C+39Zn →3FeZn13+C
Cov khoom ntawm zinc dross:
Lub melting point ntawm zinc dross yog siab dua li cov zinc ntshiab.
Qhov ntom ntawm zinc dross yog ntau dua li cov zinc ntshiab. Raws li kev ntsuas los ntawm Schurmann, qhov ntom ntawm zinc dross nrog hlau ntsiab lus ntawm 6.2%, 7.0%, 9.0%, thiab 22% yog 7.15, 7.24, 7.24, thiab 7.36 kg / dm³ ua.
Cov duab crystalline ntawm zinc dross belongs rau symmetric monoclinic system thiab hexagon, nrog rau cov yam ntxwv angular.
Cov xim ntawm zinc dross yog greyish-dawb nrog ib tug silvery.
Zinc dross muaj impurities xws li txhuas, txhuas, antimony, cadmium, tooj liab, thiab insoluble compounds ntawm acids.
Cov ntsiab lus zinc hauv zinc dross yog li ntawm 94-97%.
Cov ntsiab lus hlau hauv zinc dross yog li ntawm 3-6%.
Zinc dross yog nkig piv rau cov zinc ntshiab, yog li tsis muaj kev hloov pauv.
9) Cov ntsiab lus ntawm zinc dross yog ib qho alloy tsim los ntawm kev suav nrog cov drifting ζ-theem thiab 栅状δ1-theem txheej hauv zinc, nrog rau lwm yam impurities.
