65. Nyob rau hauv dab tsi yog zinc slag tsim? Nws cov khoom thiab cov khoom yog dab tsi?

Zinc slag feem ntau muaj cov tshuaj tiv thaiv ntawm zinc thiab hlau, nrog rau nws cov khoom tseem ceeb yog ζ-theem hlau-zinc alloy txheej tsim los ntawm lawv kev sib xyaw. Yog li ntawd, zinc slag feem ntau muaj 3-6% hlau thiab 94-97% zinc. Hauv qee cov txheej txheem kub-dip galvanizing, txhuas yog ntxiv los tiv thaiv lub lauj kaub galvanizing hauv qab, ua rau zinc slag muaj 1.5-2% txhuas. Tsis tas li ntawd, txhuas yog qee zaum koom ua ke los txhim kho qhov du du thiab microstructure ntawm txheej txheej galvanized, ua rau muaj cov lej ntawm txhuas hauv zinc slag.
Cov hlau nyob rau hauv zinc slag feem ntau yog los ntawm cov hlau ntsev adhering rau steel yeeb nkab nto thaum lub sij hawm pretreatment, nrog rau hlau -zinc alloy txheej tsim los ntawm dissolution ntawm zinc kua thiab kev sib nrig sib diffusion ntawm hlau thiab zinc atoms nyob rau hauv cov kav dej, galvanizing pots, thiab plating khoom. Lub crystallized ζ-theem txheej (lub npe hu ua drift txheej) detaches los ntawm steel substrate thiab accumulates nyob rau hauv qab ntawm lub lauj kaub galvanizing, maj mam tsim cov zinc slag txheej.
Kev tsim cov zinc slag suav nrog ob qhov kev cuam tshuam loj: 1) Hlau ntsev-induced cov tshuaj tiv thaiv: FeCl₂ + 8Zn → ZnCl₂ + FeZn₇; FeCl₂ + 14Zn → ZnCl₂ + FeZn₁₃. 2) Steel-induced reaction: Fe₃C + 21Zn → 3FeZn₁₃ + C; Fe₃C + 39Zn → 3FeZn₁₃ + C. Cov khoom tseem ceeb ntawm zinc slag muaj xws li: 1) Lub melting point ntau dua li cov zinc ntshiab; 2) Qhov ntom ntom ntau dua li cov zinc ntshiab. Raws li Schullman txoj kev, zinc slag ntom ntom ntawm cov hlau ntawm 6.2%, 7.0%, 9.0%, thiab 22% yog 7.15,7.24,7.24, thiab 7.36 kg / dm⁻⁸, feem.
3) Lub crystalline morphology ntawm zinc slag nthuav tawm symmetrical monoclinic thiab cov qauv hexagonal nrog cov yam ntxwv sib txawv; 4) Nws qhia txog qhov greyish - xim dawb nrog lub ntsej muag silvery; 5) Lub slag muaj impurities xws li insoluble compounds ntawm txhuas, txhuas, antimony, cadmium, tooj liab, thiab acids; 6) Cov ntsiab lus zinc yog li ntawm 94% mus rau 97%; 7) Cov ntsiab lus hlau yog kwv yees li 3% mus rau 6%; 8) Vim nws brittleness, zinc slag tsis muaj qhov yooj ntawm cov zinc ntshiab; 9) Qhov tseem ceeb, zinc slag yog ib qho alloy tsim los ntawm zinc tov nrog ζ theem ntawm txheej txheej, δ1 theem ntawm txheej lattice, thiab lwm yam impurities.