83. Zinc slag tsim li cas? Nws cov khoom yog dab tsi?

Zinc slag feem ntau yog cov khoom ntawm zinc- cov tshuaj tiv thaiv hlau, feem ntau yog cov hlau-zinc alloy txheej tsim los ntawm kev sib xyaw ntawm zinc thiab hlau. 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, ua rau zinc slag muaj 1.5-2% txhuas (tsis yog cov hmoov txhuas sib xyaw nrog zinc). Thaum lub sij hawm kub-dip galvanizing ntawm steel kav, txhuas yog txhob txwm ntxiv kom ua tau ib tug kaj galvanized txheej, uas yog vim li cas zinc slag kuj muaj ib co ntawm cov txhuas.
Cov kav hlau steel yuav tsum tau kho ua ntej ua ntej muab tso rau hauv zinc molten. Kev tu tsis zoo thaum lub sij hawm ua ntej ua rau cov ntsev hlau ua raws li cov kav dej. Thaum kub kub galvanizing, zinc da dej dissolves hlau-raws li substrates (cov kav dej, galvanizing pots, thiab galvanizing tshuab), ua kom muaj kev sib tshuam ntawm cov hlau thiab zinc atoms los tsim cov hlau-zinc alloy txheej. Qhov tshwm sim theem crystallization detaches los ntawm substrate, nyob rau hauv qab ntawm lub lauj kaub galvanizing los tsim zinc sludge. Hauv qhuav- txheej txheem kub-dip galvanizing ntau lawm, zinc sludge feem ntau suav rau 10-20% ntawm tag nrho cov zinc noj.
Cov txheej txheem tsim zinc slag suav nrog cov tshuaj tiv thaiv hauv qab no: (1) Hlau ntsev-induced cov tshuaj tiv thaiv: FeCl₂ + 8Zn → ZnCl₂ + FeZn; FeCl₂ + 14Zn → ZnCl₂ + FeZn; 12 (2) Steel-induced cov tshuaj tiv thaiv: Fe8C + 21Zn → 3FeZn7 + C; Fe8C + 39Zn → 3Fe8Zn18 + C.